1 /* 2 * kmp_lock.cpp -- lock-related functions 3 */ 4 5 //===----------------------------------------------------------------------===// 6 // 7 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 8 // See https://llvm.org/LICENSE.txt for license information. 9 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 10 // 11 //===----------------------------------------------------------------------===// 12 13 #include <stddef.h> 14 #include <atomic> 15 16 #include "kmp.h" 17 #include "kmp_i18n.h" 18 #include "kmp_io.h" 19 #include "kmp_itt.h" 20 #include "kmp_lock.h" 21 #include "kmp_wait_release.h" 22 #include "kmp_wrapper_getpid.h" 23 24 #if KMP_USE_FUTEX 25 #include <sys/syscall.h> 26 #include <unistd.h> 27 // We should really include <futex.h>, but that causes compatibility problems on 28 // different Linux* OS distributions that either require that you include (or 29 // break when you try to include) <pci/types.h>. Since all we need is the two 30 // macros below (which are part of the kernel ABI, so can't change) we just 31 // define the constants here and don't include <futex.h> 32 #ifndef FUTEX_WAIT 33 #define FUTEX_WAIT 0 34 #endif 35 #ifndef FUTEX_WAKE 36 #define FUTEX_WAKE 1 37 #endif 38 #endif 39 40 /* Implement spin locks for internal library use. */ 41 /* The algorithm implemented is Lamport's bakery lock [1974]. */ 42 43 void __kmp_validate_locks(void) { 44 int i; 45 kmp_uint32 x, y; 46 47 /* Check to make sure unsigned arithmetic does wraps properly */ 48 x = ~((kmp_uint32)0) - 2; 49 y = x - 2; 50 51 for (i = 0; i < 8; ++i, ++x, ++y) { 52 kmp_uint32 z = (x - y); 53 KMP_ASSERT(z == 2); 54 } 55 56 KMP_ASSERT(offsetof(kmp_base_queuing_lock, tail_id) % 8 == 0); 57 } 58 59 /* ------------------------------------------------------------------------ */ 60 /* test and set locks */ 61 62 // For the non-nested locks, we can only assume that the first 4 bytes were 63 // allocated, since gcc only allocates 4 bytes for omp_lock_t, and the Intel 64 // compiler only allocates a 4 byte pointer on IA-32 architecture. On 65 // Windows* OS on Intel(R) 64, we can assume that all 8 bytes were allocated. 66 // 67 // gcc reserves >= 8 bytes for nested locks, so we can assume that the 68 // entire 8 bytes were allocated for nested locks on all 64-bit platforms. 69 70 static kmp_int32 __kmp_get_tas_lock_owner(kmp_tas_lock_t *lck) { 71 return KMP_LOCK_STRIP(KMP_ATOMIC_LD_RLX(&lck->lk.poll)) - 1; 72 } 73 74 static inline bool __kmp_is_tas_lock_nestable(kmp_tas_lock_t *lck) { 75 return lck->lk.depth_locked != -1; 76 } 77 78 __forceinline static int 79 __kmp_acquire_tas_lock_timed_template(kmp_tas_lock_t *lck, kmp_int32 gtid) { 80 KMP_MB(); 81 82 #ifdef USE_LOCK_PROFILE 83 kmp_uint32 curr = KMP_LOCK_STRIP(lck->lk.poll); 84 if ((curr != 0) && (curr != gtid + 1)) 85 __kmp_printf("LOCK CONTENTION: %p\n", lck); 86 /* else __kmp_printf( "." );*/ 87 #endif /* USE_LOCK_PROFILE */ 88 89 kmp_int32 tas_free = KMP_LOCK_FREE(tas); 90 kmp_int32 tas_busy = KMP_LOCK_BUSY(gtid + 1, tas); 91 92 if (KMP_ATOMIC_LD_RLX(&lck->lk.poll) == tas_free && 93 __kmp_atomic_compare_store_acq(&lck->lk.poll, tas_free, tas_busy)) { 94 KMP_FSYNC_ACQUIRED(lck); 95 return KMP_LOCK_ACQUIRED_FIRST; 96 } 97 98 kmp_uint32 spins; 99 KMP_FSYNC_PREPARE(lck); 100 KMP_INIT_YIELD(spins); 101 kmp_backoff_t backoff = __kmp_spin_backoff_params; 102 do { 103 __kmp_spin_backoff(&backoff); 104 KMP_YIELD_OVERSUB_ELSE_SPIN(spins); 105 } while (KMP_ATOMIC_LD_RLX(&lck->lk.poll) != tas_free || 106 !__kmp_atomic_compare_store_acq(&lck->lk.poll, tas_free, tas_busy)); 107 KMP_FSYNC_ACQUIRED(lck); 108 return KMP_LOCK_ACQUIRED_FIRST; 109 } 110 111 int __kmp_acquire_tas_lock(kmp_tas_lock_t *lck, kmp_int32 gtid) { 112 int retval = __kmp_acquire_tas_lock_timed_template(lck, gtid); 113 return retval; 114 } 115 116 static int __kmp_acquire_tas_lock_with_checks(kmp_tas_lock_t *lck, 117 kmp_int32 gtid) { 118 char const *const func = "omp_set_lock"; 119 if ((sizeof(kmp_tas_lock_t) <= OMP_LOCK_T_SIZE) && 120 __kmp_is_tas_lock_nestable(lck)) { 121 KMP_FATAL(LockNestableUsedAsSimple, func); 122 } 123 if ((gtid >= 0) && (__kmp_get_tas_lock_owner(lck) == gtid)) { 124 KMP_FATAL(LockIsAlreadyOwned, func); 125 } 126 return __kmp_acquire_tas_lock(lck, gtid); 127 } 128 129 int __kmp_test_tas_lock(kmp_tas_lock_t *lck, kmp_int32 gtid) { 130 kmp_int32 tas_free = KMP_LOCK_FREE(tas); 131 kmp_int32 tas_busy = KMP_LOCK_BUSY(gtid + 1, tas); 132 if (KMP_ATOMIC_LD_RLX(&lck->lk.poll) == tas_free && 133 __kmp_atomic_compare_store_acq(&lck->lk.poll, tas_free, tas_busy)) { 134 KMP_FSYNC_ACQUIRED(lck); 135 return TRUE; 136 } 137 return FALSE; 138 } 139 140 static int __kmp_test_tas_lock_with_checks(kmp_tas_lock_t *lck, 141 kmp_int32 gtid) { 142 char const *const func = "omp_test_lock"; 143 if ((sizeof(kmp_tas_lock_t) <= OMP_LOCK_T_SIZE) && 144 __kmp_is_tas_lock_nestable(lck)) { 145 KMP_FATAL(LockNestableUsedAsSimple, func); 146 } 147 return __kmp_test_tas_lock(lck, gtid); 148 } 149 150 int __kmp_release_tas_lock(kmp_tas_lock_t *lck, kmp_int32 gtid) { 151 KMP_MB(); /* Flush all pending memory write invalidates. */ 152 153 KMP_FSYNC_RELEASING(lck); 154 KMP_ATOMIC_ST_REL(&lck->lk.poll, KMP_LOCK_FREE(tas)); 155 KMP_MB(); /* Flush all pending memory write invalidates. */ 156 157 KMP_YIELD_OVERSUB(); 158 return KMP_LOCK_RELEASED; 159 } 160 161 static int __kmp_release_tas_lock_with_checks(kmp_tas_lock_t *lck, 162 kmp_int32 gtid) { 163 char const *const func = "omp_unset_lock"; 164 KMP_MB(); /* in case another processor initialized lock */ 165 if ((sizeof(kmp_tas_lock_t) <= OMP_LOCK_T_SIZE) && 166 __kmp_is_tas_lock_nestable(lck)) { 167 KMP_FATAL(LockNestableUsedAsSimple, func); 168 } 169 if (__kmp_get_tas_lock_owner(lck) == -1) { 170 KMP_FATAL(LockUnsettingFree, func); 171 } 172 if ((gtid >= 0) && (__kmp_get_tas_lock_owner(lck) >= 0) && 173 (__kmp_get_tas_lock_owner(lck) != gtid)) { 174 KMP_FATAL(LockUnsettingSetByAnother, func); 175 } 176 return __kmp_release_tas_lock(lck, gtid); 177 } 178 179 void __kmp_init_tas_lock(kmp_tas_lock_t *lck) { 180 lck->lk.poll = KMP_LOCK_FREE(tas); 181 } 182 183 void __kmp_destroy_tas_lock(kmp_tas_lock_t *lck) { lck->lk.poll = 0; } 184 185 static void __kmp_destroy_tas_lock_with_checks(kmp_tas_lock_t *lck) { 186 char const *const func = "omp_destroy_lock"; 187 if ((sizeof(kmp_tas_lock_t) <= OMP_LOCK_T_SIZE) && 188 __kmp_is_tas_lock_nestable(lck)) { 189 KMP_FATAL(LockNestableUsedAsSimple, func); 190 } 191 if (__kmp_get_tas_lock_owner(lck) != -1) { 192 KMP_FATAL(LockStillOwned, func); 193 } 194 __kmp_destroy_tas_lock(lck); 195 } 196 197 // nested test and set locks 198 199 int __kmp_acquire_nested_tas_lock(kmp_tas_lock_t *lck, kmp_int32 gtid) { 200 KMP_DEBUG_ASSERT(gtid >= 0); 201 202 if (__kmp_get_tas_lock_owner(lck) == gtid) { 203 lck->lk.depth_locked += 1; 204 return KMP_LOCK_ACQUIRED_NEXT; 205 } else { 206 __kmp_acquire_tas_lock_timed_template(lck, gtid); 207 lck->lk.depth_locked = 1; 208 return KMP_LOCK_ACQUIRED_FIRST; 209 } 210 } 211 212 static int __kmp_acquire_nested_tas_lock_with_checks(kmp_tas_lock_t *lck, 213 kmp_int32 gtid) { 214 char const *const func = "omp_set_nest_lock"; 215 if (!__kmp_is_tas_lock_nestable(lck)) { 216 KMP_FATAL(LockSimpleUsedAsNestable, func); 217 } 218 return __kmp_acquire_nested_tas_lock(lck, gtid); 219 } 220 221 int __kmp_test_nested_tas_lock(kmp_tas_lock_t *lck, kmp_int32 gtid) { 222 int retval; 223 224 KMP_DEBUG_ASSERT(gtid >= 0); 225 226 if (__kmp_get_tas_lock_owner(lck) == gtid) { 227 retval = ++lck->lk.depth_locked; 228 } else if (!__kmp_test_tas_lock(lck, gtid)) { 229 retval = 0; 230 } else { 231 KMP_MB(); 232 retval = lck->lk.depth_locked = 1; 233 } 234 return retval; 235 } 236 237 static int __kmp_test_nested_tas_lock_with_checks(kmp_tas_lock_t *lck, 238 kmp_int32 gtid) { 239 char const *const func = "omp_test_nest_lock"; 240 if (!__kmp_is_tas_lock_nestable(lck)) { 241 KMP_FATAL(LockSimpleUsedAsNestable, func); 242 } 243 return __kmp_test_nested_tas_lock(lck, gtid); 244 } 245 246 int __kmp_release_nested_tas_lock(kmp_tas_lock_t *lck, kmp_int32 gtid) { 247 KMP_DEBUG_ASSERT(gtid >= 0); 248 249 KMP_MB(); 250 if (--(lck->lk.depth_locked) == 0) { 251 __kmp_release_tas_lock(lck, gtid); 252 return KMP_LOCK_RELEASED; 253 } 254 return KMP_LOCK_STILL_HELD; 255 } 256 257 static int __kmp_release_nested_tas_lock_with_checks(kmp_tas_lock_t *lck, 258 kmp_int32 gtid) { 259 char const *const func = "omp_unset_nest_lock"; 260 KMP_MB(); /* in case another processor initialized lock */ 261 if (!__kmp_is_tas_lock_nestable(lck)) { 262 KMP_FATAL(LockSimpleUsedAsNestable, func); 263 } 264 if (__kmp_get_tas_lock_owner(lck) == -1) { 265 KMP_FATAL(LockUnsettingFree, func); 266 } 267 if (__kmp_get_tas_lock_owner(lck) != gtid) { 268 KMP_FATAL(LockUnsettingSetByAnother, func); 269 } 270 return __kmp_release_nested_tas_lock(lck, gtid); 271 } 272 273 void __kmp_init_nested_tas_lock(kmp_tas_lock_t *lck) { 274 __kmp_init_tas_lock(lck); 275 lck->lk.depth_locked = 0; // >= 0 for nestable locks, -1 for simple locks 276 } 277 278 void __kmp_destroy_nested_tas_lock(kmp_tas_lock_t *lck) { 279 __kmp_destroy_tas_lock(lck); 280 lck->lk.depth_locked = 0; 281 } 282 283 static void __kmp_destroy_nested_tas_lock_with_checks(kmp_tas_lock_t *lck) { 284 char const *const func = "omp_destroy_nest_lock"; 285 if (!__kmp_is_tas_lock_nestable(lck)) { 286 KMP_FATAL(LockSimpleUsedAsNestable, func); 287 } 288 if (__kmp_get_tas_lock_owner(lck) != -1) { 289 KMP_FATAL(LockStillOwned, func); 290 } 291 __kmp_destroy_nested_tas_lock(lck); 292 } 293 294 #if KMP_USE_FUTEX 295 296 /* ------------------------------------------------------------------------ */ 297 /* futex locks */ 298 299 // futex locks are really just test and set locks, with a different method 300 // of handling contention. They take the same amount of space as test and 301 // set locks, and are allocated the same way (i.e. use the area allocated by 302 // the compiler for non-nested locks / allocate nested locks on the heap). 303 304 static kmp_int32 __kmp_get_futex_lock_owner(kmp_futex_lock_t *lck) { 305 return KMP_LOCK_STRIP((TCR_4(lck->lk.poll) >> 1)) - 1; 306 } 307 308 static inline bool __kmp_is_futex_lock_nestable(kmp_futex_lock_t *lck) { 309 return lck->lk.depth_locked != -1; 310 } 311 312 __forceinline static int 313 __kmp_acquire_futex_lock_timed_template(kmp_futex_lock_t *lck, kmp_int32 gtid) { 314 kmp_int32 gtid_code = (gtid + 1) << 1; 315 316 KMP_MB(); 317 318 #ifdef USE_LOCK_PROFILE 319 kmp_uint32 curr = KMP_LOCK_STRIP(TCR_4(lck->lk.poll)); 320 if ((curr != 0) && (curr != gtid_code)) 321 __kmp_printf("LOCK CONTENTION: %p\n", lck); 322 /* else __kmp_printf( "." );*/ 323 #endif /* USE_LOCK_PROFILE */ 324 325 KMP_FSYNC_PREPARE(lck); 326 KA_TRACE(1000, ("__kmp_acquire_futex_lock: lck:%p(0x%x), T#%d entering\n", 327 lck, lck->lk.poll, gtid)); 328 329 kmp_int32 poll_val; 330 331 while ((poll_val = KMP_COMPARE_AND_STORE_RET32( 332 &(lck->lk.poll), KMP_LOCK_FREE(futex), 333 KMP_LOCK_BUSY(gtid_code, futex))) != KMP_LOCK_FREE(futex)) { 334 335 kmp_int32 cond = KMP_LOCK_STRIP(poll_val) & 1; 336 KA_TRACE( 337 1000, 338 ("__kmp_acquire_futex_lock: lck:%p, T#%d poll_val = 0x%x cond = 0x%x\n", 339 lck, gtid, poll_val, cond)); 340 341 // NOTE: if you try to use the following condition for this branch 342 // 343 // if ( poll_val & 1 == 0 ) 344 // 345 // Then the 12.0 compiler has a bug where the following block will 346 // always be skipped, regardless of the value of the LSB of poll_val. 347 if (!cond) { 348 // Try to set the lsb in the poll to indicate to the owner 349 // thread that they need to wake this thread up. 350 if (!KMP_COMPARE_AND_STORE_REL32(&(lck->lk.poll), poll_val, 351 poll_val | KMP_LOCK_BUSY(1, futex))) { 352 KA_TRACE( 353 1000, 354 ("__kmp_acquire_futex_lock: lck:%p(0x%x), T#%d can't set bit 0\n", 355 lck, lck->lk.poll, gtid)); 356 continue; 357 } 358 poll_val |= KMP_LOCK_BUSY(1, futex); 359 360 KA_TRACE(1000, 361 ("__kmp_acquire_futex_lock: lck:%p(0x%x), T#%d bit 0 set\n", lck, 362 lck->lk.poll, gtid)); 363 } 364 365 KA_TRACE( 366 1000, 367 ("__kmp_acquire_futex_lock: lck:%p, T#%d before futex_wait(0x%x)\n", 368 lck, gtid, poll_val)); 369 370 long rc; 371 if ((rc = syscall(__NR_futex, &(lck->lk.poll), FUTEX_WAIT, poll_val, NULL, 372 NULL, 0)) != 0) { 373 KA_TRACE(1000, ("__kmp_acquire_futex_lock: lck:%p, T#%d futex_wait(0x%x) " 374 "failed (rc=%ld errno=%d)\n", 375 lck, gtid, poll_val, rc, errno)); 376 continue; 377 } 378 379 KA_TRACE(1000, 380 ("__kmp_acquire_futex_lock: lck:%p, T#%d after futex_wait(0x%x)\n", 381 lck, gtid, poll_val)); 382 // This thread has now done a successful futex wait call and was entered on 383 // the OS futex queue. We must now perform a futex wake call when releasing 384 // the lock, as we have no idea how many other threads are in the queue. 385 gtid_code |= 1; 386 } 387 388 KMP_FSYNC_ACQUIRED(lck); 389 KA_TRACE(1000, ("__kmp_acquire_futex_lock: lck:%p(0x%x), T#%d exiting\n", lck, 390 lck->lk.poll, gtid)); 391 return KMP_LOCK_ACQUIRED_FIRST; 392 } 393 394 int __kmp_acquire_futex_lock(kmp_futex_lock_t *lck, kmp_int32 gtid) { 395 int retval = __kmp_acquire_futex_lock_timed_template(lck, gtid); 396 return retval; 397 } 398 399 static int __kmp_acquire_futex_lock_with_checks(kmp_futex_lock_t *lck, 400 kmp_int32 gtid) { 401 char const *const func = "omp_set_lock"; 402 if ((sizeof(kmp_futex_lock_t) <= OMP_LOCK_T_SIZE) && 403 __kmp_is_futex_lock_nestable(lck)) { 404 KMP_FATAL(LockNestableUsedAsSimple, func); 405 } 406 if ((gtid >= 0) && (__kmp_get_futex_lock_owner(lck) == gtid)) { 407 KMP_FATAL(LockIsAlreadyOwned, func); 408 } 409 return __kmp_acquire_futex_lock(lck, gtid); 410 } 411 412 int __kmp_test_futex_lock(kmp_futex_lock_t *lck, kmp_int32 gtid) { 413 if (KMP_COMPARE_AND_STORE_ACQ32(&(lck->lk.poll), KMP_LOCK_FREE(futex), 414 KMP_LOCK_BUSY((gtid + 1) << 1, futex))) { 415 KMP_FSYNC_ACQUIRED(lck); 416 return TRUE; 417 } 418 return FALSE; 419 } 420 421 static int __kmp_test_futex_lock_with_checks(kmp_futex_lock_t *lck, 422 kmp_int32 gtid) { 423 char const *const func = "omp_test_lock"; 424 if ((sizeof(kmp_futex_lock_t) <= OMP_LOCK_T_SIZE) && 425 __kmp_is_futex_lock_nestable(lck)) { 426 KMP_FATAL(LockNestableUsedAsSimple, func); 427 } 428 return __kmp_test_futex_lock(lck, gtid); 429 } 430 431 int __kmp_release_futex_lock(kmp_futex_lock_t *lck, kmp_int32 gtid) { 432 KMP_MB(); /* Flush all pending memory write invalidates. */ 433 434 KA_TRACE(1000, ("__kmp_release_futex_lock: lck:%p(0x%x), T#%d entering\n", 435 lck, lck->lk.poll, gtid)); 436 437 KMP_FSYNC_RELEASING(lck); 438 439 kmp_int32 poll_val = KMP_XCHG_FIXED32(&(lck->lk.poll), KMP_LOCK_FREE(futex)); 440 441 KA_TRACE(1000, 442 ("__kmp_release_futex_lock: lck:%p, T#%d released poll_val = 0x%x\n", 443 lck, gtid, poll_val)); 444 445 if (KMP_LOCK_STRIP(poll_val) & 1) { 446 KA_TRACE(1000, 447 ("__kmp_release_futex_lock: lck:%p, T#%d futex_wake 1 thread\n", 448 lck, gtid)); 449 syscall(__NR_futex, &(lck->lk.poll), FUTEX_WAKE, KMP_LOCK_BUSY(1, futex), 450 NULL, NULL, 0); 451 } 452 453 KMP_MB(); /* Flush all pending memory write invalidates. */ 454 455 KA_TRACE(1000, ("__kmp_release_futex_lock: lck:%p(0x%x), T#%d exiting\n", lck, 456 lck->lk.poll, gtid)); 457 458 KMP_YIELD_OVERSUB(); 459 return KMP_LOCK_RELEASED; 460 } 461 462 static int __kmp_release_futex_lock_with_checks(kmp_futex_lock_t *lck, 463 kmp_int32 gtid) { 464 char const *const func = "omp_unset_lock"; 465 KMP_MB(); /* in case another processor initialized lock */ 466 if ((sizeof(kmp_futex_lock_t) <= OMP_LOCK_T_SIZE) && 467 __kmp_is_futex_lock_nestable(lck)) { 468 KMP_FATAL(LockNestableUsedAsSimple, func); 469 } 470 if (__kmp_get_futex_lock_owner(lck) == -1) { 471 KMP_FATAL(LockUnsettingFree, func); 472 } 473 if ((gtid >= 0) && (__kmp_get_futex_lock_owner(lck) >= 0) && 474 (__kmp_get_futex_lock_owner(lck) != gtid)) { 475 KMP_FATAL(LockUnsettingSetByAnother, func); 476 } 477 return __kmp_release_futex_lock(lck, gtid); 478 } 479 480 void __kmp_init_futex_lock(kmp_futex_lock_t *lck) { 481 TCW_4(lck->lk.poll, KMP_LOCK_FREE(futex)); 482 } 483 484 void __kmp_destroy_futex_lock(kmp_futex_lock_t *lck) { lck->lk.poll = 0; } 485 486 static void __kmp_destroy_futex_lock_with_checks(kmp_futex_lock_t *lck) { 487 char const *const func = "omp_destroy_lock"; 488 if ((sizeof(kmp_futex_lock_t) <= OMP_LOCK_T_SIZE) && 489 __kmp_is_futex_lock_nestable(lck)) { 490 KMP_FATAL(LockNestableUsedAsSimple, func); 491 } 492 if (__kmp_get_futex_lock_owner(lck) != -1) { 493 KMP_FATAL(LockStillOwned, func); 494 } 495 __kmp_destroy_futex_lock(lck); 496 } 497 498 // nested futex locks 499 500 int __kmp_acquire_nested_futex_lock(kmp_futex_lock_t *lck, kmp_int32 gtid) { 501 KMP_DEBUG_ASSERT(gtid >= 0); 502 503 if (__kmp_get_futex_lock_owner(lck) == gtid) { 504 lck->lk.depth_locked += 1; 505 return KMP_LOCK_ACQUIRED_NEXT; 506 } else { 507 __kmp_acquire_futex_lock_timed_template(lck, gtid); 508 lck->lk.depth_locked = 1; 509 return KMP_LOCK_ACQUIRED_FIRST; 510 } 511 } 512 513 static int __kmp_acquire_nested_futex_lock_with_checks(kmp_futex_lock_t *lck, 514 kmp_int32 gtid) { 515 char const *const func = "omp_set_nest_lock"; 516 if (!__kmp_is_futex_lock_nestable(lck)) { 517 KMP_FATAL(LockSimpleUsedAsNestable, func); 518 } 519 return __kmp_acquire_nested_futex_lock(lck, gtid); 520 } 521 522 int __kmp_test_nested_futex_lock(kmp_futex_lock_t *lck, kmp_int32 gtid) { 523 int retval; 524 525 KMP_DEBUG_ASSERT(gtid >= 0); 526 527 if (__kmp_get_futex_lock_owner(lck) == gtid) { 528 retval = ++lck->lk.depth_locked; 529 } else if (!__kmp_test_futex_lock(lck, gtid)) { 530 retval = 0; 531 } else { 532 KMP_MB(); 533 retval = lck->lk.depth_locked = 1; 534 } 535 return retval; 536 } 537 538 static int __kmp_test_nested_futex_lock_with_checks(kmp_futex_lock_t *lck, 539 kmp_int32 gtid) { 540 char const *const func = "omp_test_nest_lock"; 541 if (!__kmp_is_futex_lock_nestable(lck)) { 542 KMP_FATAL(LockSimpleUsedAsNestable, func); 543 } 544 return __kmp_test_nested_futex_lock(lck, gtid); 545 } 546 547 int __kmp_release_nested_futex_lock(kmp_futex_lock_t *lck, kmp_int32 gtid) { 548 KMP_DEBUG_ASSERT(gtid >= 0); 549 550 KMP_MB(); 551 if (--(lck->lk.depth_locked) == 0) { 552 __kmp_release_futex_lock(lck, gtid); 553 return KMP_LOCK_RELEASED; 554 } 555 return KMP_LOCK_STILL_HELD; 556 } 557 558 static int __kmp_release_nested_futex_lock_with_checks(kmp_futex_lock_t *lck, 559 kmp_int32 gtid) { 560 char const *const func = "omp_unset_nest_lock"; 561 KMP_MB(); /* in case another processor initialized lock */ 562 if (!__kmp_is_futex_lock_nestable(lck)) { 563 KMP_FATAL(LockSimpleUsedAsNestable, func); 564 } 565 if (__kmp_get_futex_lock_owner(lck) == -1) { 566 KMP_FATAL(LockUnsettingFree, func); 567 } 568 if (__kmp_get_futex_lock_owner(lck) != gtid) { 569 KMP_FATAL(LockUnsettingSetByAnother, func); 570 } 571 return __kmp_release_nested_futex_lock(lck, gtid); 572 } 573 574 void __kmp_init_nested_futex_lock(kmp_futex_lock_t *lck) { 575 __kmp_init_futex_lock(lck); 576 lck->lk.depth_locked = 0; // >= 0 for nestable locks, -1 for simple locks 577 } 578 579 void __kmp_destroy_nested_futex_lock(kmp_futex_lock_t *lck) { 580 __kmp_destroy_futex_lock(lck); 581 lck->lk.depth_locked = 0; 582 } 583 584 static void __kmp_destroy_nested_futex_lock_with_checks(kmp_futex_lock_t *lck) { 585 char const *const func = "omp_destroy_nest_lock"; 586 if (!__kmp_is_futex_lock_nestable(lck)) { 587 KMP_FATAL(LockSimpleUsedAsNestable, func); 588 } 589 if (__kmp_get_futex_lock_owner(lck) != -1) { 590 KMP_FATAL(LockStillOwned, func); 591 } 592 __kmp_destroy_nested_futex_lock(lck); 593 } 594 595 #endif // KMP_USE_FUTEX 596 597 /* ------------------------------------------------------------------------ */ 598 /* ticket (bakery) locks */ 599 600 static kmp_int32 __kmp_get_ticket_lock_owner(kmp_ticket_lock_t *lck) { 601 return std::atomic_load_explicit(&lck->lk.owner_id, 602 std::memory_order_relaxed) - 603 1; 604 } 605 606 static inline bool __kmp_is_ticket_lock_nestable(kmp_ticket_lock_t *lck) { 607 return std::atomic_load_explicit(&lck->lk.depth_locked, 608 std::memory_order_relaxed) != -1; 609 } 610 611 static kmp_uint32 __kmp_bakery_check(void *now_serving, kmp_uint32 my_ticket) { 612 return std::atomic_load_explicit((std::atomic<unsigned> *)now_serving, 613 std::memory_order_acquire) == my_ticket; 614 } 615 616 __forceinline static int 617 __kmp_acquire_ticket_lock_timed_template(kmp_ticket_lock_t *lck, 618 kmp_int32 gtid) { 619 kmp_uint32 my_ticket = std::atomic_fetch_add_explicit( 620 &lck->lk.next_ticket, 1U, std::memory_order_relaxed); 621 622 #ifdef USE_LOCK_PROFILE 623 if (std::atomic_load_explicit(&lck->lk.now_serving, 624 std::memory_order_relaxed) != my_ticket) 625 __kmp_printf("LOCK CONTENTION: %p\n", lck); 626 /* else __kmp_printf( "." );*/ 627 #endif /* USE_LOCK_PROFILE */ 628 629 if (std::atomic_load_explicit(&lck->lk.now_serving, 630 std::memory_order_acquire) == my_ticket) { 631 return KMP_LOCK_ACQUIRED_FIRST; 632 } 633 KMP_WAIT_PTR(&lck->lk.now_serving, my_ticket, __kmp_bakery_check, lck); 634 return KMP_LOCK_ACQUIRED_FIRST; 635 } 636 637 int __kmp_acquire_ticket_lock(kmp_ticket_lock_t *lck, kmp_int32 gtid) { 638 int retval = __kmp_acquire_ticket_lock_timed_template(lck, gtid); 639 return retval; 640 } 641 642 static int __kmp_acquire_ticket_lock_with_checks(kmp_ticket_lock_t *lck, 643 kmp_int32 gtid) { 644 char const *const func = "omp_set_lock"; 645 646 if (!std::atomic_load_explicit(&lck->lk.initialized, 647 std::memory_order_relaxed)) { 648 KMP_FATAL(LockIsUninitialized, func); 649 } 650 if (lck->lk.self != lck) { 651 KMP_FATAL(LockIsUninitialized, func); 652 } 653 if (__kmp_is_ticket_lock_nestable(lck)) { 654 KMP_FATAL(LockNestableUsedAsSimple, func); 655 } 656 if ((gtid >= 0) && (__kmp_get_ticket_lock_owner(lck) == gtid)) { 657 KMP_FATAL(LockIsAlreadyOwned, func); 658 } 659 660 __kmp_acquire_ticket_lock(lck, gtid); 661 662 std::atomic_store_explicit(&lck->lk.owner_id, gtid + 1, 663 std::memory_order_relaxed); 664 return KMP_LOCK_ACQUIRED_FIRST; 665 } 666 667 int __kmp_test_ticket_lock(kmp_ticket_lock_t *lck, kmp_int32 gtid) { 668 kmp_uint32 my_ticket = std::atomic_load_explicit(&lck->lk.next_ticket, 669 std::memory_order_relaxed); 670 671 if (std::atomic_load_explicit(&lck->lk.now_serving, 672 std::memory_order_relaxed) == my_ticket) { 673 kmp_uint32 next_ticket = my_ticket + 1; 674 if (std::atomic_compare_exchange_strong_explicit( 675 &lck->lk.next_ticket, &my_ticket, next_ticket, 676 std::memory_order_acquire, std::memory_order_acquire)) { 677 return TRUE; 678 } 679 } 680 return FALSE; 681 } 682 683 static int __kmp_test_ticket_lock_with_checks(kmp_ticket_lock_t *lck, 684 kmp_int32 gtid) { 685 char const *const func = "omp_test_lock"; 686 687 if (!std::atomic_load_explicit(&lck->lk.initialized, 688 std::memory_order_relaxed)) { 689 KMP_FATAL(LockIsUninitialized, func); 690 } 691 if (lck->lk.self != lck) { 692 KMP_FATAL(LockIsUninitialized, func); 693 } 694 if (__kmp_is_ticket_lock_nestable(lck)) { 695 KMP_FATAL(LockNestableUsedAsSimple, func); 696 } 697 698 int retval = __kmp_test_ticket_lock(lck, gtid); 699 700 if (retval) { 701 std::atomic_store_explicit(&lck->lk.owner_id, gtid + 1, 702 std::memory_order_relaxed); 703 } 704 return retval; 705 } 706 707 int __kmp_release_ticket_lock(kmp_ticket_lock_t *lck, kmp_int32 gtid) { 708 kmp_uint32 distance = std::atomic_load_explicit(&lck->lk.next_ticket, 709 std::memory_order_relaxed) - 710 std::atomic_load_explicit(&lck->lk.now_serving, 711 std::memory_order_relaxed); 712 713 std::atomic_fetch_add_explicit(&lck->lk.now_serving, 1U, 714 std::memory_order_release); 715 716 KMP_YIELD(distance > 717 (kmp_uint32)(__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc)); 718 return KMP_LOCK_RELEASED; 719 } 720 721 static int __kmp_release_ticket_lock_with_checks(kmp_ticket_lock_t *lck, 722 kmp_int32 gtid) { 723 char const *const func = "omp_unset_lock"; 724 725 if (!std::atomic_load_explicit(&lck->lk.initialized, 726 std::memory_order_relaxed)) { 727 KMP_FATAL(LockIsUninitialized, func); 728 } 729 if (lck->lk.self != lck) { 730 KMP_FATAL(LockIsUninitialized, func); 731 } 732 if (__kmp_is_ticket_lock_nestable(lck)) { 733 KMP_FATAL(LockNestableUsedAsSimple, func); 734 } 735 if (__kmp_get_ticket_lock_owner(lck) == -1) { 736 KMP_FATAL(LockUnsettingFree, func); 737 } 738 if ((gtid >= 0) && (__kmp_get_ticket_lock_owner(lck) >= 0) && 739 (__kmp_get_ticket_lock_owner(lck) != gtid)) { 740 KMP_FATAL(LockUnsettingSetByAnother, func); 741 } 742 std::atomic_store_explicit(&lck->lk.owner_id, 0, std::memory_order_relaxed); 743 return __kmp_release_ticket_lock(lck, gtid); 744 } 745 746 void __kmp_init_ticket_lock(kmp_ticket_lock_t *lck) { 747 lck->lk.location = NULL; 748 lck->lk.self = lck; 749 std::atomic_store_explicit(&lck->lk.next_ticket, 0U, 750 std::memory_order_relaxed); 751 std::atomic_store_explicit(&lck->lk.now_serving, 0U, 752 std::memory_order_relaxed); 753 std::atomic_store_explicit( 754 &lck->lk.owner_id, 0, 755 std::memory_order_relaxed); // no thread owns the lock. 756 std::atomic_store_explicit( 757 &lck->lk.depth_locked, -1, 758 std::memory_order_relaxed); // -1 => not a nested lock. 759 std::atomic_store_explicit(&lck->lk.initialized, true, 760 std::memory_order_release); 761 } 762 763 void __kmp_destroy_ticket_lock(kmp_ticket_lock_t *lck) { 764 std::atomic_store_explicit(&lck->lk.initialized, false, 765 std::memory_order_release); 766 lck->lk.self = NULL; 767 lck->lk.location = NULL; 768 std::atomic_store_explicit(&lck->lk.next_ticket, 0U, 769 std::memory_order_relaxed); 770 std::atomic_store_explicit(&lck->lk.now_serving, 0U, 771 std::memory_order_relaxed); 772 std::atomic_store_explicit(&lck->lk.owner_id, 0, std::memory_order_relaxed); 773 std::atomic_store_explicit(&lck->lk.depth_locked, -1, 774 std::memory_order_relaxed); 775 } 776 777 static void __kmp_destroy_ticket_lock_with_checks(kmp_ticket_lock_t *lck) { 778 char const *const func = "omp_destroy_lock"; 779 780 if (!std::atomic_load_explicit(&lck->lk.initialized, 781 std::memory_order_relaxed)) { 782 KMP_FATAL(LockIsUninitialized, func); 783 } 784 if (lck->lk.self != lck) { 785 KMP_FATAL(LockIsUninitialized, func); 786 } 787 if (__kmp_is_ticket_lock_nestable(lck)) { 788 KMP_FATAL(LockNestableUsedAsSimple, func); 789 } 790 if (__kmp_get_ticket_lock_owner(lck) != -1) { 791 KMP_FATAL(LockStillOwned, func); 792 } 793 __kmp_destroy_ticket_lock(lck); 794 } 795 796 // nested ticket locks 797 798 int __kmp_acquire_nested_ticket_lock(kmp_ticket_lock_t *lck, kmp_int32 gtid) { 799 KMP_DEBUG_ASSERT(gtid >= 0); 800 801 if (__kmp_get_ticket_lock_owner(lck) == gtid) { 802 std::atomic_fetch_add_explicit(&lck->lk.depth_locked, 1, 803 std::memory_order_relaxed); 804 return KMP_LOCK_ACQUIRED_NEXT; 805 } else { 806 __kmp_acquire_ticket_lock_timed_template(lck, gtid); 807 std::atomic_store_explicit(&lck->lk.depth_locked, 1, 808 std::memory_order_relaxed); 809 std::atomic_store_explicit(&lck->lk.owner_id, gtid + 1, 810 std::memory_order_relaxed); 811 return KMP_LOCK_ACQUIRED_FIRST; 812 } 813 } 814 815 static int __kmp_acquire_nested_ticket_lock_with_checks(kmp_ticket_lock_t *lck, 816 kmp_int32 gtid) { 817 char const *const func = "omp_set_nest_lock"; 818 819 if (!std::atomic_load_explicit(&lck->lk.initialized, 820 std::memory_order_relaxed)) { 821 KMP_FATAL(LockIsUninitialized, func); 822 } 823 if (lck->lk.self != lck) { 824 KMP_FATAL(LockIsUninitialized, func); 825 } 826 if (!__kmp_is_ticket_lock_nestable(lck)) { 827 KMP_FATAL(LockSimpleUsedAsNestable, func); 828 } 829 return __kmp_acquire_nested_ticket_lock(lck, gtid); 830 } 831 832 int __kmp_test_nested_ticket_lock(kmp_ticket_lock_t *lck, kmp_int32 gtid) { 833 int retval; 834 835 KMP_DEBUG_ASSERT(gtid >= 0); 836 837 if (__kmp_get_ticket_lock_owner(lck) == gtid) { 838 retval = std::atomic_fetch_add_explicit(&lck->lk.depth_locked, 1, 839 std::memory_order_relaxed) + 840 1; 841 } else if (!__kmp_test_ticket_lock(lck, gtid)) { 842 retval = 0; 843 } else { 844 std::atomic_store_explicit(&lck->lk.depth_locked, 1, 845 std::memory_order_relaxed); 846 std::atomic_store_explicit(&lck->lk.owner_id, gtid + 1, 847 std::memory_order_relaxed); 848 retval = 1; 849 } 850 return retval; 851 } 852 853 static int __kmp_test_nested_ticket_lock_with_checks(kmp_ticket_lock_t *lck, 854 kmp_int32 gtid) { 855 char const *const func = "omp_test_nest_lock"; 856 857 if (!std::atomic_load_explicit(&lck->lk.initialized, 858 std::memory_order_relaxed)) { 859 KMP_FATAL(LockIsUninitialized, func); 860 } 861 if (lck->lk.self != lck) { 862 KMP_FATAL(LockIsUninitialized, func); 863 } 864 if (!__kmp_is_ticket_lock_nestable(lck)) { 865 KMP_FATAL(LockSimpleUsedAsNestable, func); 866 } 867 return __kmp_test_nested_ticket_lock(lck, gtid); 868 } 869 870 int __kmp_release_nested_ticket_lock(kmp_ticket_lock_t *lck, kmp_int32 gtid) { 871 KMP_DEBUG_ASSERT(gtid >= 0); 872 873 if ((std::atomic_fetch_add_explicit(&lck->lk.depth_locked, -1, 874 std::memory_order_relaxed) - 875 1) == 0) { 876 std::atomic_store_explicit(&lck->lk.owner_id, 0, std::memory_order_relaxed); 877 __kmp_release_ticket_lock(lck, gtid); 878 return KMP_LOCK_RELEASED; 879 } 880 return KMP_LOCK_STILL_HELD; 881 } 882 883 static int __kmp_release_nested_ticket_lock_with_checks(kmp_ticket_lock_t *lck, 884 kmp_int32 gtid) { 885 char const *const func = "omp_unset_nest_lock"; 886 887 if (!std::atomic_load_explicit(&lck->lk.initialized, 888 std::memory_order_relaxed)) { 889 KMP_FATAL(LockIsUninitialized, func); 890 } 891 if (lck->lk.self != lck) { 892 KMP_FATAL(LockIsUninitialized, func); 893 } 894 if (!__kmp_is_ticket_lock_nestable(lck)) { 895 KMP_FATAL(LockSimpleUsedAsNestable, func); 896 } 897 if (__kmp_get_ticket_lock_owner(lck) == -1) { 898 KMP_FATAL(LockUnsettingFree, func); 899 } 900 if (__kmp_get_ticket_lock_owner(lck) != gtid) { 901 KMP_FATAL(LockUnsettingSetByAnother, func); 902 } 903 return __kmp_release_nested_ticket_lock(lck, gtid); 904 } 905 906 void __kmp_init_nested_ticket_lock(kmp_ticket_lock_t *lck) { 907 __kmp_init_ticket_lock(lck); 908 std::atomic_store_explicit(&lck->lk.depth_locked, 0, 909 std::memory_order_relaxed); 910 // >= 0 for nestable locks, -1 for simple locks 911 } 912 913 void __kmp_destroy_nested_ticket_lock(kmp_ticket_lock_t *lck) { 914 __kmp_destroy_ticket_lock(lck); 915 std::atomic_store_explicit(&lck->lk.depth_locked, 0, 916 std::memory_order_relaxed); 917 } 918 919 static void 920 __kmp_destroy_nested_ticket_lock_with_checks(kmp_ticket_lock_t *lck) { 921 char const *const func = "omp_destroy_nest_lock"; 922 923 if (!std::atomic_load_explicit(&lck->lk.initialized, 924 std::memory_order_relaxed)) { 925 KMP_FATAL(LockIsUninitialized, func); 926 } 927 if (lck->lk.self != lck) { 928 KMP_FATAL(LockIsUninitialized, func); 929 } 930 if (!__kmp_is_ticket_lock_nestable(lck)) { 931 KMP_FATAL(LockSimpleUsedAsNestable, func); 932 } 933 if (__kmp_get_ticket_lock_owner(lck) != -1) { 934 KMP_FATAL(LockStillOwned, func); 935 } 936 __kmp_destroy_nested_ticket_lock(lck); 937 } 938 939 // access functions to fields which don't exist for all lock kinds. 940 941 static const ident_t *__kmp_get_ticket_lock_location(kmp_ticket_lock_t *lck) { 942 return lck->lk.location; 943 } 944 945 static void __kmp_set_ticket_lock_location(kmp_ticket_lock_t *lck, 946 const ident_t *loc) { 947 lck->lk.location = loc; 948 } 949 950 static kmp_lock_flags_t __kmp_get_ticket_lock_flags(kmp_ticket_lock_t *lck) { 951 return lck->lk.flags; 952 } 953 954 static void __kmp_set_ticket_lock_flags(kmp_ticket_lock_t *lck, 955 kmp_lock_flags_t flags) { 956 lck->lk.flags = flags; 957 } 958 959 /* ------------------------------------------------------------------------ */ 960 /* queuing locks */ 961 962 /* First the states 963 (head,tail) = 0, 0 means lock is unheld, nobody on queue 964 UINT_MAX or -1, 0 means lock is held, nobody on queue 965 h, h means lock held or about to transition, 966 1 element on queue 967 h, t h <> t, means lock is held or about to 968 transition, >1 elements on queue 969 970 Now the transitions 971 Acquire(0,0) = -1 ,0 972 Release(0,0) = Error 973 Acquire(-1,0) = h ,h h > 0 974 Release(-1,0) = 0 ,0 975 Acquire(h,h) = h ,t h > 0, t > 0, h <> t 976 Release(h,h) = -1 ,0 h > 0 977 Acquire(h,t) = h ,t' h > 0, t > 0, t' > 0, h <> t, h <> t', t <> t' 978 Release(h,t) = h',t h > 0, t > 0, h <> t, h <> h', h' maybe = t 979 980 And pictorially 981 982 +-----+ 983 | 0, 0|------- release -------> Error 984 +-----+ 985 | ^ 986 acquire| |release 987 | | 988 | | 989 v | 990 +-----+ 991 |-1, 0| 992 +-----+ 993 | ^ 994 acquire| |release 995 | | 996 | | 997 v | 998 +-----+ 999 | h, h| 1000 +-----+ 1001 | ^ 1002 acquire| |release 1003 | | 1004 | | 1005 v | 1006 +-----+ 1007 | h, t|----- acquire, release loopback ---+ 1008 +-----+ | 1009 ^ | 1010 | | 1011 +------------------------------------+ 1012 */ 1013 1014 #ifdef DEBUG_QUEUING_LOCKS 1015 1016 /* Stuff for circular trace buffer */ 1017 #define TRACE_BUF_ELE 1024 1018 static char traces[TRACE_BUF_ELE][128] = {0}; 1019 static int tc = 0; 1020 #define TRACE_LOCK(X, Y) \ 1021 KMP_SNPRINTF(traces[tc++ % TRACE_BUF_ELE], 128, "t%d at %s\n", X, Y); 1022 #define TRACE_LOCK_T(X, Y, Z) \ 1023 KMP_SNPRINTF(traces[tc++ % TRACE_BUF_ELE], 128, "t%d at %s%d\n", X, Y, Z); 1024 #define TRACE_LOCK_HT(X, Y, Z, Q) \ 1025 KMP_SNPRINTF(traces[tc++ % TRACE_BUF_ELE], 128, "t%d at %s %d,%d\n", X, Y, \ 1026 Z, Q); 1027 1028 static void __kmp_dump_queuing_lock(kmp_info_t *this_thr, kmp_int32 gtid, 1029 kmp_queuing_lock_t *lck, kmp_int32 head_id, 1030 kmp_int32 tail_id) { 1031 kmp_int32 t, i; 1032 1033 __kmp_printf_no_lock("\n__kmp_dump_queuing_lock: TRACE BEGINS HERE! \n"); 1034 1035 i = tc % TRACE_BUF_ELE; 1036 __kmp_printf_no_lock("%s\n", traces[i]); 1037 i = (i + 1) % TRACE_BUF_ELE; 1038 while (i != (tc % TRACE_BUF_ELE)) { 1039 __kmp_printf_no_lock("%s", traces[i]); 1040 i = (i + 1) % TRACE_BUF_ELE; 1041 } 1042 __kmp_printf_no_lock("\n"); 1043 1044 __kmp_printf_no_lock("\n__kmp_dump_queuing_lock: gtid+1:%d, spin_here:%d, " 1045 "next_wait:%d, head_id:%d, tail_id:%d\n", 1046 gtid + 1, this_thr->th.th_spin_here, 1047 this_thr->th.th_next_waiting, head_id, tail_id); 1048 1049 __kmp_printf_no_lock("\t\thead: %d ", lck->lk.head_id); 1050 1051 if (lck->lk.head_id >= 1) { 1052 t = __kmp_threads[lck->lk.head_id - 1]->th.th_next_waiting; 1053 while (t > 0) { 1054 __kmp_printf_no_lock("-> %d ", t); 1055 t = __kmp_threads[t - 1]->th.th_next_waiting; 1056 } 1057 } 1058 __kmp_printf_no_lock("; tail: %d ", lck->lk.tail_id); 1059 __kmp_printf_no_lock("\n\n"); 1060 } 1061 1062 #endif /* DEBUG_QUEUING_LOCKS */ 1063 1064 static kmp_int32 __kmp_get_queuing_lock_owner(kmp_queuing_lock_t *lck) { 1065 return TCR_4(lck->lk.owner_id) - 1; 1066 } 1067 1068 static inline bool __kmp_is_queuing_lock_nestable(kmp_queuing_lock_t *lck) { 1069 return lck->lk.depth_locked != -1; 1070 } 1071 1072 /* Acquire a lock using a the queuing lock implementation */ 1073 template <bool takeTime> 1074 /* [TLW] The unused template above is left behind because of what BEB believes 1075 is a potential compiler problem with __forceinline. */ 1076 __forceinline static int 1077 __kmp_acquire_queuing_lock_timed_template(kmp_queuing_lock_t *lck, 1078 kmp_int32 gtid) { 1079 kmp_info_t *this_thr = __kmp_thread_from_gtid(gtid); 1080 volatile kmp_int32 *head_id_p = &lck->lk.head_id; 1081 volatile kmp_int32 *tail_id_p = &lck->lk.tail_id; 1082 volatile kmp_uint32 *spin_here_p; 1083 1084 #if OMPT_SUPPORT 1085 ompt_state_t prev_state = ompt_state_undefined; 1086 #endif 1087 1088 KA_TRACE(1000, 1089 ("__kmp_acquire_queuing_lock: lck:%p, T#%d entering\n", lck, gtid)); 1090 1091 KMP_FSYNC_PREPARE(lck); 1092 KMP_DEBUG_ASSERT(this_thr != NULL); 1093 spin_here_p = &this_thr->th.th_spin_here; 1094 1095 #ifdef DEBUG_QUEUING_LOCKS 1096 TRACE_LOCK(gtid + 1, "acq ent"); 1097 if (*spin_here_p) 1098 __kmp_dump_queuing_lock(this_thr, gtid, lck, *head_id_p, *tail_id_p); 1099 if (this_thr->th.th_next_waiting != 0) 1100 __kmp_dump_queuing_lock(this_thr, gtid, lck, *head_id_p, *tail_id_p); 1101 #endif 1102 KMP_DEBUG_ASSERT(!*spin_here_p); 1103 KMP_DEBUG_ASSERT(this_thr->th.th_next_waiting == 0); 1104 1105 /* The following st.rel to spin_here_p needs to precede the cmpxchg.acq to 1106 head_id_p that may follow, not just in execution order, but also in 1107 visibility order. This way, when a releasing thread observes the changes to 1108 the queue by this thread, it can rightly assume that spin_here_p has 1109 already been set to TRUE, so that when it sets spin_here_p to FALSE, it is 1110 not premature. If the releasing thread sets spin_here_p to FALSE before 1111 this thread sets it to TRUE, this thread will hang. */ 1112 *spin_here_p = TRUE; /* before enqueuing to prevent race */ 1113 1114 while (1) { 1115 kmp_int32 enqueued; 1116 kmp_int32 head; 1117 kmp_int32 tail; 1118 1119 head = *head_id_p; 1120 1121 switch (head) { 1122 1123 case -1: { 1124 #ifdef DEBUG_QUEUING_LOCKS 1125 tail = *tail_id_p; 1126 TRACE_LOCK_HT(gtid + 1, "acq read: ", head, tail); 1127 #endif 1128 tail = 0; /* to make sure next link asynchronously read is not set 1129 accidentally; this assignment prevents us from entering the 1130 if ( t > 0 ) condition in the enqueued case below, which is not 1131 necessary for this state transition */ 1132 1133 /* try (-1,0)->(tid,tid) */ 1134 enqueued = KMP_COMPARE_AND_STORE_ACQ64((volatile kmp_int64 *)tail_id_p, 1135 KMP_PACK_64(-1, 0), 1136 KMP_PACK_64(gtid + 1, gtid + 1)); 1137 #ifdef DEBUG_QUEUING_LOCKS 1138 if (enqueued) 1139 TRACE_LOCK(gtid + 1, "acq enq: (-1,0)->(tid,tid)"); 1140 #endif 1141 } break; 1142 1143 default: { 1144 tail = *tail_id_p; 1145 KMP_DEBUG_ASSERT(tail != gtid + 1); 1146 1147 #ifdef DEBUG_QUEUING_LOCKS 1148 TRACE_LOCK_HT(gtid + 1, "acq read: ", head, tail); 1149 #endif 1150 1151 if (tail == 0) { 1152 enqueued = FALSE; 1153 } else { 1154 /* try (h,t) or (h,h)->(h,tid) */ 1155 enqueued = KMP_COMPARE_AND_STORE_ACQ32(tail_id_p, tail, gtid + 1); 1156 1157 #ifdef DEBUG_QUEUING_LOCKS 1158 if (enqueued) 1159 TRACE_LOCK(gtid + 1, "acq enq: (h,t)->(h,tid)"); 1160 #endif 1161 } 1162 } break; 1163 1164 case 0: /* empty queue */ 1165 { 1166 kmp_int32 grabbed_lock; 1167 1168 #ifdef DEBUG_QUEUING_LOCKS 1169 tail = *tail_id_p; 1170 TRACE_LOCK_HT(gtid + 1, "acq read: ", head, tail); 1171 #endif 1172 /* try (0,0)->(-1,0) */ 1173 1174 /* only legal transition out of head = 0 is head = -1 with no change to 1175 * tail */ 1176 grabbed_lock = KMP_COMPARE_AND_STORE_ACQ32(head_id_p, 0, -1); 1177 1178 if (grabbed_lock) { 1179 1180 *spin_here_p = FALSE; 1181 1182 KA_TRACE( 1183 1000, 1184 ("__kmp_acquire_queuing_lock: lck:%p, T#%d exiting: no queuing\n", 1185 lck, gtid)); 1186 #ifdef DEBUG_QUEUING_LOCKS 1187 TRACE_LOCK_HT(gtid + 1, "acq exit: ", head, 0); 1188 #endif 1189 1190 #if OMPT_SUPPORT 1191 if (ompt_enabled.enabled && prev_state != ompt_state_undefined) { 1192 /* change the state before clearing wait_id */ 1193 this_thr->th.ompt_thread_info.state = prev_state; 1194 this_thr->th.ompt_thread_info.wait_id = 0; 1195 } 1196 #endif 1197 1198 KMP_FSYNC_ACQUIRED(lck); 1199 return KMP_LOCK_ACQUIRED_FIRST; /* lock holder cannot be on queue */ 1200 } 1201 enqueued = FALSE; 1202 } break; 1203 } 1204 1205 #if OMPT_SUPPORT 1206 if (ompt_enabled.enabled && prev_state == ompt_state_undefined) { 1207 /* this thread will spin; set wait_id before entering wait state */ 1208 prev_state = this_thr->th.ompt_thread_info.state; 1209 this_thr->th.ompt_thread_info.wait_id = (uint64_t)lck; 1210 this_thr->th.ompt_thread_info.state = ompt_state_wait_lock; 1211 } 1212 #endif 1213 1214 if (enqueued) { 1215 if (tail > 0) { 1216 kmp_info_t *tail_thr = __kmp_thread_from_gtid(tail - 1); 1217 KMP_ASSERT(tail_thr != NULL); 1218 tail_thr->th.th_next_waiting = gtid + 1; 1219 /* corresponding wait for this write in release code */ 1220 } 1221 KA_TRACE(1000, 1222 ("__kmp_acquire_queuing_lock: lck:%p, T#%d waiting for lock\n", 1223 lck, gtid)); 1224 1225 KMP_MB(); 1226 // ToDo: Use __kmp_wait_sleep or similar when blocktime != inf 1227 KMP_WAIT(spin_here_p, FALSE, KMP_EQ, lck); 1228 // Synchronize writes to both runtime thread structures 1229 // and writes in user code. 1230 KMP_MB(); 1231 1232 #ifdef DEBUG_QUEUING_LOCKS 1233 TRACE_LOCK(gtid + 1, "acq spin"); 1234 1235 if (this_thr->th.th_next_waiting != 0) 1236 __kmp_dump_queuing_lock(this_thr, gtid, lck, *head_id_p, *tail_id_p); 1237 #endif 1238 KMP_DEBUG_ASSERT(this_thr->th.th_next_waiting == 0); 1239 KA_TRACE(1000, ("__kmp_acquire_queuing_lock: lck:%p, T#%d exiting: after " 1240 "waiting on queue\n", 1241 lck, gtid)); 1242 1243 #ifdef DEBUG_QUEUING_LOCKS 1244 TRACE_LOCK(gtid + 1, "acq exit 2"); 1245 #endif 1246 1247 #if OMPT_SUPPORT 1248 /* change the state before clearing wait_id */ 1249 this_thr->th.ompt_thread_info.state = prev_state; 1250 this_thr->th.ompt_thread_info.wait_id = 0; 1251 #endif 1252 1253 /* got lock, we were dequeued by the thread that released lock */ 1254 return KMP_LOCK_ACQUIRED_FIRST; 1255 } 1256 1257 /* Yield if number of threads > number of logical processors */ 1258 /* ToDo: Not sure why this should only be in oversubscription case, 1259 maybe should be traditional YIELD_INIT/YIELD_WHEN loop */ 1260 KMP_YIELD_OVERSUB(); 1261 1262 #ifdef DEBUG_QUEUING_LOCKS 1263 TRACE_LOCK(gtid + 1, "acq retry"); 1264 #endif 1265 } 1266 KMP_ASSERT2(0, "should not get here"); 1267 return KMP_LOCK_ACQUIRED_FIRST; 1268 } 1269 1270 int __kmp_acquire_queuing_lock(kmp_queuing_lock_t *lck, kmp_int32 gtid) { 1271 KMP_DEBUG_ASSERT(gtid >= 0); 1272 1273 int retval = __kmp_acquire_queuing_lock_timed_template<false>(lck, gtid); 1274 return retval; 1275 } 1276 1277 static int __kmp_acquire_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 1278 kmp_int32 gtid) { 1279 char const *const func = "omp_set_lock"; 1280 if (lck->lk.initialized != lck) { 1281 KMP_FATAL(LockIsUninitialized, func); 1282 } 1283 if (__kmp_is_queuing_lock_nestable(lck)) { 1284 KMP_FATAL(LockNestableUsedAsSimple, func); 1285 } 1286 if (__kmp_get_queuing_lock_owner(lck) == gtid) { 1287 KMP_FATAL(LockIsAlreadyOwned, func); 1288 } 1289 1290 __kmp_acquire_queuing_lock(lck, gtid); 1291 1292 lck->lk.owner_id = gtid + 1; 1293 return KMP_LOCK_ACQUIRED_FIRST; 1294 } 1295 1296 int __kmp_test_queuing_lock(kmp_queuing_lock_t *lck, kmp_int32 gtid) { 1297 volatile kmp_int32 *head_id_p = &lck->lk.head_id; 1298 kmp_int32 head; 1299 #ifdef KMP_DEBUG 1300 kmp_info_t *this_thr; 1301 #endif 1302 1303 KA_TRACE(1000, ("__kmp_test_queuing_lock: T#%d entering\n", gtid)); 1304 KMP_DEBUG_ASSERT(gtid >= 0); 1305 #ifdef KMP_DEBUG 1306 this_thr = __kmp_thread_from_gtid(gtid); 1307 KMP_DEBUG_ASSERT(this_thr != NULL); 1308 KMP_DEBUG_ASSERT(!this_thr->th.th_spin_here); 1309 #endif 1310 1311 head = *head_id_p; 1312 1313 if (head == 0) { /* nobody on queue, nobody holding */ 1314 /* try (0,0)->(-1,0) */ 1315 if (KMP_COMPARE_AND_STORE_ACQ32(head_id_p, 0, -1)) { 1316 KA_TRACE(1000, 1317 ("__kmp_test_queuing_lock: T#%d exiting: holding lock\n", gtid)); 1318 KMP_FSYNC_ACQUIRED(lck); 1319 return TRUE; 1320 } 1321 } 1322 1323 KA_TRACE(1000, 1324 ("__kmp_test_queuing_lock: T#%d exiting: without lock\n", gtid)); 1325 return FALSE; 1326 } 1327 1328 static int __kmp_test_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 1329 kmp_int32 gtid) { 1330 char const *const func = "omp_test_lock"; 1331 if (lck->lk.initialized != lck) { 1332 KMP_FATAL(LockIsUninitialized, func); 1333 } 1334 if (__kmp_is_queuing_lock_nestable(lck)) { 1335 KMP_FATAL(LockNestableUsedAsSimple, func); 1336 } 1337 1338 int retval = __kmp_test_queuing_lock(lck, gtid); 1339 1340 if (retval) { 1341 lck->lk.owner_id = gtid + 1; 1342 } 1343 return retval; 1344 } 1345 1346 int __kmp_release_queuing_lock(kmp_queuing_lock_t *lck, kmp_int32 gtid) { 1347 volatile kmp_int32 *head_id_p = &lck->lk.head_id; 1348 volatile kmp_int32 *tail_id_p = &lck->lk.tail_id; 1349 1350 KA_TRACE(1000, 1351 ("__kmp_release_queuing_lock: lck:%p, T#%d entering\n", lck, gtid)); 1352 KMP_DEBUG_ASSERT(gtid >= 0); 1353 #if KMP_DEBUG || DEBUG_QUEUING_LOCKS 1354 kmp_info_t *this_thr = __kmp_thread_from_gtid(gtid); 1355 #endif 1356 KMP_DEBUG_ASSERT(this_thr != NULL); 1357 #ifdef DEBUG_QUEUING_LOCKS 1358 TRACE_LOCK(gtid + 1, "rel ent"); 1359 1360 if (this_thr->th.th_spin_here) 1361 __kmp_dump_queuing_lock(this_thr, gtid, lck, *head_id_p, *tail_id_p); 1362 if (this_thr->th.th_next_waiting != 0) 1363 __kmp_dump_queuing_lock(this_thr, gtid, lck, *head_id_p, *tail_id_p); 1364 #endif 1365 KMP_DEBUG_ASSERT(!this_thr->th.th_spin_here); 1366 KMP_DEBUG_ASSERT(this_thr->th.th_next_waiting == 0); 1367 1368 KMP_FSYNC_RELEASING(lck); 1369 1370 while (1) { 1371 kmp_int32 dequeued; 1372 kmp_int32 head; 1373 kmp_int32 tail; 1374 1375 head = *head_id_p; 1376 1377 #ifdef DEBUG_QUEUING_LOCKS 1378 tail = *tail_id_p; 1379 TRACE_LOCK_HT(gtid + 1, "rel read: ", head, tail); 1380 if (head == 0) 1381 __kmp_dump_queuing_lock(this_thr, gtid, lck, head, tail); 1382 #endif 1383 KMP_DEBUG_ASSERT(head != 1384 0); /* holding the lock, head must be -1 or queue head */ 1385 1386 if (head == -1) { /* nobody on queue */ 1387 /* try (-1,0)->(0,0) */ 1388 if (KMP_COMPARE_AND_STORE_REL32(head_id_p, -1, 0)) { 1389 KA_TRACE( 1390 1000, 1391 ("__kmp_release_queuing_lock: lck:%p, T#%d exiting: queue empty\n", 1392 lck, gtid)); 1393 #ifdef DEBUG_QUEUING_LOCKS 1394 TRACE_LOCK_HT(gtid + 1, "rel exit: ", 0, 0); 1395 #endif 1396 1397 #if OMPT_SUPPORT 1398 /* nothing to do - no other thread is trying to shift blame */ 1399 #endif 1400 return KMP_LOCK_RELEASED; 1401 } 1402 dequeued = FALSE; 1403 } else { 1404 KMP_MB(); 1405 tail = *tail_id_p; 1406 if (head == tail) { /* only one thread on the queue */ 1407 #ifdef DEBUG_QUEUING_LOCKS 1408 if (head <= 0) 1409 __kmp_dump_queuing_lock(this_thr, gtid, lck, head, tail); 1410 #endif 1411 KMP_DEBUG_ASSERT(head > 0); 1412 1413 /* try (h,h)->(-1,0) */ 1414 dequeued = KMP_COMPARE_AND_STORE_REL64( 1415 RCAST(volatile kmp_int64 *, tail_id_p), KMP_PACK_64(head, head), 1416 KMP_PACK_64(-1, 0)); 1417 #ifdef DEBUG_QUEUING_LOCKS 1418 TRACE_LOCK(gtid + 1, "rel deq: (h,h)->(-1,0)"); 1419 #endif 1420 1421 } else { 1422 volatile kmp_int32 *waiting_id_p; 1423 kmp_info_t *head_thr = __kmp_thread_from_gtid(head - 1); 1424 KMP_DEBUG_ASSERT(head_thr != NULL); 1425 waiting_id_p = &head_thr->th.th_next_waiting; 1426 1427 /* Does this require synchronous reads? */ 1428 #ifdef DEBUG_QUEUING_LOCKS 1429 if (head <= 0 || tail <= 0) 1430 __kmp_dump_queuing_lock(this_thr, gtid, lck, head, tail); 1431 #endif 1432 KMP_DEBUG_ASSERT(head > 0 && tail > 0); 1433 1434 /* try (h,t)->(h',t) or (t,t) */ 1435 KMP_MB(); 1436 /* make sure enqueuing thread has time to update next waiting thread 1437 * field */ 1438 *head_id_p = 1439 KMP_WAIT((volatile kmp_uint32 *)waiting_id_p, 0, KMP_NEQ, NULL); 1440 #ifdef DEBUG_QUEUING_LOCKS 1441 TRACE_LOCK(gtid + 1, "rel deq: (h,t)->(h',t)"); 1442 #endif 1443 dequeued = TRUE; 1444 } 1445 } 1446 1447 if (dequeued) { 1448 kmp_info_t *head_thr = __kmp_thread_from_gtid(head - 1); 1449 KMP_DEBUG_ASSERT(head_thr != NULL); 1450 1451 /* Does this require synchronous reads? */ 1452 #ifdef DEBUG_QUEUING_LOCKS 1453 if (head <= 0 || tail <= 0) 1454 __kmp_dump_queuing_lock(this_thr, gtid, lck, head, tail); 1455 #endif 1456 KMP_DEBUG_ASSERT(head > 0 && tail > 0); 1457 1458 /* For clean code only. Thread not released until next statement prevents 1459 race with acquire code. */ 1460 head_thr->th.th_next_waiting = 0; 1461 #ifdef DEBUG_QUEUING_LOCKS 1462 TRACE_LOCK_T(gtid + 1, "rel nw=0 for t=", head); 1463 #endif 1464 1465 KMP_MB(); 1466 /* reset spin value */ 1467 head_thr->th.th_spin_here = FALSE; 1468 1469 KA_TRACE(1000, ("__kmp_release_queuing_lock: lck:%p, T#%d exiting: after " 1470 "dequeuing\n", 1471 lck, gtid)); 1472 #ifdef DEBUG_QUEUING_LOCKS 1473 TRACE_LOCK(gtid + 1, "rel exit 2"); 1474 #endif 1475 return KMP_LOCK_RELEASED; 1476 } 1477 /* KMP_CPU_PAUSE(); don't want to make releasing thread hold up acquiring 1478 threads */ 1479 1480 #ifdef DEBUG_QUEUING_LOCKS 1481 TRACE_LOCK(gtid + 1, "rel retry"); 1482 #endif 1483 1484 } /* while */ 1485 KMP_ASSERT2(0, "should not get here"); 1486 return KMP_LOCK_RELEASED; 1487 } 1488 1489 static int __kmp_release_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 1490 kmp_int32 gtid) { 1491 char const *const func = "omp_unset_lock"; 1492 KMP_MB(); /* in case another processor initialized lock */ 1493 if (lck->lk.initialized != lck) { 1494 KMP_FATAL(LockIsUninitialized, func); 1495 } 1496 if (__kmp_is_queuing_lock_nestable(lck)) { 1497 KMP_FATAL(LockNestableUsedAsSimple, func); 1498 } 1499 if (__kmp_get_queuing_lock_owner(lck) == -1) { 1500 KMP_FATAL(LockUnsettingFree, func); 1501 } 1502 if (__kmp_get_queuing_lock_owner(lck) != gtid) { 1503 KMP_FATAL(LockUnsettingSetByAnother, func); 1504 } 1505 lck->lk.owner_id = 0; 1506 return __kmp_release_queuing_lock(lck, gtid); 1507 } 1508 1509 void __kmp_init_queuing_lock(kmp_queuing_lock_t *lck) { 1510 lck->lk.location = NULL; 1511 lck->lk.head_id = 0; 1512 lck->lk.tail_id = 0; 1513 lck->lk.next_ticket = 0; 1514 lck->lk.now_serving = 0; 1515 lck->lk.owner_id = 0; // no thread owns the lock. 1516 lck->lk.depth_locked = -1; // >= 0 for nestable locks, -1 for simple locks. 1517 lck->lk.initialized = lck; 1518 1519 KA_TRACE(1000, ("__kmp_init_queuing_lock: lock %p initialized\n", lck)); 1520 } 1521 1522 void __kmp_destroy_queuing_lock(kmp_queuing_lock_t *lck) { 1523 lck->lk.initialized = NULL; 1524 lck->lk.location = NULL; 1525 lck->lk.head_id = 0; 1526 lck->lk.tail_id = 0; 1527 lck->lk.next_ticket = 0; 1528 lck->lk.now_serving = 0; 1529 lck->lk.owner_id = 0; 1530 lck->lk.depth_locked = -1; 1531 } 1532 1533 static void __kmp_destroy_queuing_lock_with_checks(kmp_queuing_lock_t *lck) { 1534 char const *const func = "omp_destroy_lock"; 1535 if (lck->lk.initialized != lck) { 1536 KMP_FATAL(LockIsUninitialized, func); 1537 } 1538 if (__kmp_is_queuing_lock_nestable(lck)) { 1539 KMP_FATAL(LockNestableUsedAsSimple, func); 1540 } 1541 if (__kmp_get_queuing_lock_owner(lck) != -1) { 1542 KMP_FATAL(LockStillOwned, func); 1543 } 1544 __kmp_destroy_queuing_lock(lck); 1545 } 1546 1547 // nested queuing locks 1548 1549 int __kmp_acquire_nested_queuing_lock(kmp_queuing_lock_t *lck, kmp_int32 gtid) { 1550 KMP_DEBUG_ASSERT(gtid >= 0); 1551 1552 if (__kmp_get_queuing_lock_owner(lck) == gtid) { 1553 lck->lk.depth_locked += 1; 1554 return KMP_LOCK_ACQUIRED_NEXT; 1555 } else { 1556 __kmp_acquire_queuing_lock_timed_template<false>(lck, gtid); 1557 KMP_MB(); 1558 lck->lk.depth_locked = 1; 1559 KMP_MB(); 1560 lck->lk.owner_id = gtid + 1; 1561 return KMP_LOCK_ACQUIRED_FIRST; 1562 } 1563 } 1564 1565 static int 1566 __kmp_acquire_nested_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 1567 kmp_int32 gtid) { 1568 char const *const func = "omp_set_nest_lock"; 1569 if (lck->lk.initialized != lck) { 1570 KMP_FATAL(LockIsUninitialized, func); 1571 } 1572 if (!__kmp_is_queuing_lock_nestable(lck)) { 1573 KMP_FATAL(LockSimpleUsedAsNestable, func); 1574 } 1575 return __kmp_acquire_nested_queuing_lock(lck, gtid); 1576 } 1577 1578 int __kmp_test_nested_queuing_lock(kmp_queuing_lock_t *lck, kmp_int32 gtid) { 1579 int retval; 1580 1581 KMP_DEBUG_ASSERT(gtid >= 0); 1582 1583 if (__kmp_get_queuing_lock_owner(lck) == gtid) { 1584 retval = ++lck->lk.depth_locked; 1585 } else if (!__kmp_test_queuing_lock(lck, gtid)) { 1586 retval = 0; 1587 } else { 1588 KMP_MB(); 1589 retval = lck->lk.depth_locked = 1; 1590 KMP_MB(); 1591 lck->lk.owner_id = gtid + 1; 1592 } 1593 return retval; 1594 } 1595 1596 static int __kmp_test_nested_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 1597 kmp_int32 gtid) { 1598 char const *const func = "omp_test_nest_lock"; 1599 if (lck->lk.initialized != lck) { 1600 KMP_FATAL(LockIsUninitialized, func); 1601 } 1602 if (!__kmp_is_queuing_lock_nestable(lck)) { 1603 KMP_FATAL(LockSimpleUsedAsNestable, func); 1604 } 1605 return __kmp_test_nested_queuing_lock(lck, gtid); 1606 } 1607 1608 int __kmp_release_nested_queuing_lock(kmp_queuing_lock_t *lck, kmp_int32 gtid) { 1609 KMP_DEBUG_ASSERT(gtid >= 0); 1610 1611 KMP_MB(); 1612 if (--(lck->lk.depth_locked) == 0) { 1613 KMP_MB(); 1614 lck->lk.owner_id = 0; 1615 __kmp_release_queuing_lock(lck, gtid); 1616 return KMP_LOCK_RELEASED; 1617 } 1618 return KMP_LOCK_STILL_HELD; 1619 } 1620 1621 static int 1622 __kmp_release_nested_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 1623 kmp_int32 gtid) { 1624 char const *const func = "omp_unset_nest_lock"; 1625 KMP_MB(); /* in case another processor initialized lock */ 1626 if (lck->lk.initialized != lck) { 1627 KMP_FATAL(LockIsUninitialized, func); 1628 } 1629 if (!__kmp_is_queuing_lock_nestable(lck)) { 1630 KMP_FATAL(LockSimpleUsedAsNestable, func); 1631 } 1632 if (__kmp_get_queuing_lock_owner(lck) == -1) { 1633 KMP_FATAL(LockUnsettingFree, func); 1634 } 1635 if (__kmp_get_queuing_lock_owner(lck) != gtid) { 1636 KMP_FATAL(LockUnsettingSetByAnother, func); 1637 } 1638 return __kmp_release_nested_queuing_lock(lck, gtid); 1639 } 1640 1641 void __kmp_init_nested_queuing_lock(kmp_queuing_lock_t *lck) { 1642 __kmp_init_queuing_lock(lck); 1643 lck->lk.depth_locked = 0; // >= 0 for nestable locks, -1 for simple locks 1644 } 1645 1646 void __kmp_destroy_nested_queuing_lock(kmp_queuing_lock_t *lck) { 1647 __kmp_destroy_queuing_lock(lck); 1648 lck->lk.depth_locked = 0; 1649 } 1650 1651 static void 1652 __kmp_destroy_nested_queuing_lock_with_checks(kmp_queuing_lock_t *lck) { 1653 char const *const func = "omp_destroy_nest_lock"; 1654 if (lck->lk.initialized != lck) { 1655 KMP_FATAL(LockIsUninitialized, func); 1656 } 1657 if (!__kmp_is_queuing_lock_nestable(lck)) { 1658 KMP_FATAL(LockSimpleUsedAsNestable, func); 1659 } 1660 if (__kmp_get_queuing_lock_owner(lck) != -1) { 1661 KMP_FATAL(LockStillOwned, func); 1662 } 1663 __kmp_destroy_nested_queuing_lock(lck); 1664 } 1665 1666 // access functions to fields which don't exist for all lock kinds. 1667 1668 static const ident_t *__kmp_get_queuing_lock_location(kmp_queuing_lock_t *lck) { 1669 return lck->lk.location; 1670 } 1671 1672 static void __kmp_set_queuing_lock_location(kmp_queuing_lock_t *lck, 1673 const ident_t *loc) { 1674 lck->lk.location = loc; 1675 } 1676 1677 static kmp_lock_flags_t __kmp_get_queuing_lock_flags(kmp_queuing_lock_t *lck) { 1678 return lck->lk.flags; 1679 } 1680 1681 static void __kmp_set_queuing_lock_flags(kmp_queuing_lock_t *lck, 1682 kmp_lock_flags_t flags) { 1683 lck->lk.flags = flags; 1684 } 1685 1686 #if KMP_USE_ADAPTIVE_LOCKS 1687 1688 /* RTM Adaptive locks */ 1689 1690 #if KMP_HAVE_RTM_INTRINSICS 1691 #include <immintrin.h> 1692 #define SOFT_ABORT_MASK (_XABORT_RETRY | _XABORT_CONFLICT | _XABORT_EXPLICIT) 1693 1694 #else 1695 1696 // Values from the status register after failed speculation. 1697 #define _XBEGIN_STARTED (~0u) 1698 #define _XABORT_EXPLICIT (1 << 0) 1699 #define _XABORT_RETRY (1 << 1) 1700 #define _XABORT_CONFLICT (1 << 2) 1701 #define _XABORT_CAPACITY (1 << 3) 1702 #define _XABORT_DEBUG (1 << 4) 1703 #define _XABORT_NESTED (1 << 5) 1704 #define _XABORT_CODE(x) ((unsigned char)(((x) >> 24) & 0xFF)) 1705 1706 // Aborts for which it's worth trying again immediately 1707 #define SOFT_ABORT_MASK (_XABORT_RETRY | _XABORT_CONFLICT | _XABORT_EXPLICIT) 1708 1709 #define STRINGIZE_INTERNAL(arg) #arg 1710 #define STRINGIZE(arg) STRINGIZE_INTERNAL(arg) 1711 1712 // Access to RTM instructions 1713 /*A version of XBegin which returns -1 on speculation, and the value of EAX on 1714 an abort. This is the same definition as the compiler intrinsic that will be 1715 supported at some point. */ 1716 static __inline int _xbegin() { 1717 int res = -1; 1718 1719 #if KMP_OS_WINDOWS 1720 #if KMP_ARCH_X86_64 1721 _asm { 1722 _emit 0xC7 1723 _emit 0xF8 1724 _emit 2 1725 _emit 0 1726 _emit 0 1727 _emit 0 1728 jmp L2 1729 mov res, eax 1730 L2: 1731 } 1732 #else /* IA32 */ 1733 _asm { 1734 _emit 0xC7 1735 _emit 0xF8 1736 _emit 2 1737 _emit 0 1738 _emit 0 1739 _emit 0 1740 jmp L2 1741 mov res, eax 1742 L2: 1743 } 1744 #endif // KMP_ARCH_X86_64 1745 #else 1746 /* Note that %eax must be noted as killed (clobbered), because the XSR is 1747 returned in %eax(%rax) on abort. Other register values are restored, so 1748 don't need to be killed. 1749 1750 We must also mark 'res' as an input and an output, since otherwise 1751 'res=-1' may be dropped as being dead, whereas we do need the assignment on 1752 the successful (i.e., non-abort) path. */ 1753 __asm__ volatile("1: .byte 0xC7; .byte 0xF8;\n" 1754 " .long 1f-1b-6\n" 1755 " jmp 2f\n" 1756 "1: movl %%eax,%0\n" 1757 "2:" 1758 : "+r"(res)::"memory", "%eax"); 1759 #endif // KMP_OS_WINDOWS 1760 return res; 1761 } 1762 1763 /* Transaction end */ 1764 static __inline void _xend() { 1765 #if KMP_OS_WINDOWS 1766 __asm { 1767 _emit 0x0f 1768 _emit 0x01 1769 _emit 0xd5 1770 } 1771 #else 1772 __asm__ volatile(".byte 0x0f; .byte 0x01; .byte 0xd5" ::: "memory"); 1773 #endif 1774 } 1775 1776 /* This is a macro, the argument must be a single byte constant which can be 1777 evaluated by the inline assembler, since it is emitted as a byte into the 1778 assembly code. */ 1779 // clang-format off 1780 #if KMP_OS_WINDOWS 1781 #define _xabort(ARG) _asm _emit 0xc6 _asm _emit 0xf8 _asm _emit ARG 1782 #else 1783 #define _xabort(ARG) \ 1784 __asm__ volatile(".byte 0xC6; .byte 0xF8; .byte " STRINGIZE(ARG):::"memory"); 1785 #endif 1786 // clang-format on 1787 #endif // KMP_COMPILER_ICC && __INTEL_COMPILER >= 1300 1788 1789 // Statistics is collected for testing purpose 1790 #if KMP_DEBUG_ADAPTIVE_LOCKS 1791 1792 // We accumulate speculative lock statistics when the lock is destroyed. We 1793 // keep locks that haven't been destroyed in the liveLocks list so that we can 1794 // grab their statistics too. 1795 static kmp_adaptive_lock_statistics_t destroyedStats; 1796 1797 // To hold the list of live locks. 1798 static kmp_adaptive_lock_info_t liveLocks; 1799 1800 // A lock so we can safely update the list of locks. 1801 static kmp_bootstrap_lock_t chain_lock = 1802 KMP_BOOTSTRAP_LOCK_INITIALIZER(chain_lock); 1803 1804 // Initialize the list of stats. 1805 void __kmp_init_speculative_stats() { 1806 kmp_adaptive_lock_info_t *lck = &liveLocks; 1807 1808 memset(CCAST(kmp_adaptive_lock_statistics_t *, &(lck->stats)), 0, 1809 sizeof(lck->stats)); 1810 lck->stats.next = lck; 1811 lck->stats.prev = lck; 1812 1813 KMP_ASSERT(lck->stats.next->stats.prev == lck); 1814 KMP_ASSERT(lck->stats.prev->stats.next == lck); 1815 1816 __kmp_init_bootstrap_lock(&chain_lock); 1817 } 1818 1819 // Insert the lock into the circular list 1820 static void __kmp_remember_lock(kmp_adaptive_lock_info_t *lck) { 1821 __kmp_acquire_bootstrap_lock(&chain_lock); 1822 1823 lck->stats.next = liveLocks.stats.next; 1824 lck->stats.prev = &liveLocks; 1825 1826 liveLocks.stats.next = lck; 1827 lck->stats.next->stats.prev = lck; 1828 1829 KMP_ASSERT(lck->stats.next->stats.prev == lck); 1830 KMP_ASSERT(lck->stats.prev->stats.next == lck); 1831 1832 __kmp_release_bootstrap_lock(&chain_lock); 1833 } 1834 1835 static void __kmp_forget_lock(kmp_adaptive_lock_info_t *lck) { 1836 KMP_ASSERT(lck->stats.next->stats.prev == lck); 1837 KMP_ASSERT(lck->stats.prev->stats.next == lck); 1838 1839 kmp_adaptive_lock_info_t *n = lck->stats.next; 1840 kmp_adaptive_lock_info_t *p = lck->stats.prev; 1841 1842 n->stats.prev = p; 1843 p->stats.next = n; 1844 } 1845 1846 static void __kmp_zero_speculative_stats(kmp_adaptive_lock_info_t *lck) { 1847 memset(CCAST(kmp_adaptive_lock_statistics_t *, &lck->stats), 0, 1848 sizeof(lck->stats)); 1849 __kmp_remember_lock(lck); 1850 } 1851 1852 static void __kmp_add_stats(kmp_adaptive_lock_statistics_t *t, 1853 kmp_adaptive_lock_info_t *lck) { 1854 kmp_adaptive_lock_statistics_t volatile *s = &lck->stats; 1855 1856 t->nonSpeculativeAcquireAttempts += lck->acquire_attempts; 1857 t->successfulSpeculations += s->successfulSpeculations; 1858 t->hardFailedSpeculations += s->hardFailedSpeculations; 1859 t->softFailedSpeculations += s->softFailedSpeculations; 1860 t->nonSpeculativeAcquires += s->nonSpeculativeAcquires; 1861 t->lemmingYields += s->lemmingYields; 1862 } 1863 1864 static void __kmp_accumulate_speculative_stats(kmp_adaptive_lock_info_t *lck) { 1865 __kmp_acquire_bootstrap_lock(&chain_lock); 1866 1867 __kmp_add_stats(&destroyedStats, lck); 1868 __kmp_forget_lock(lck); 1869 1870 __kmp_release_bootstrap_lock(&chain_lock); 1871 } 1872 1873 static float percent(kmp_uint32 count, kmp_uint32 total) { 1874 return (total == 0) ? 0.0 : (100.0 * count) / total; 1875 } 1876 1877 void __kmp_print_speculative_stats() { 1878 kmp_adaptive_lock_statistics_t total = destroyedStats; 1879 kmp_adaptive_lock_info_t *lck; 1880 1881 for (lck = liveLocks.stats.next; lck != &liveLocks; lck = lck->stats.next) { 1882 __kmp_add_stats(&total, lck); 1883 } 1884 kmp_adaptive_lock_statistics_t *t = &total; 1885 kmp_uint32 totalSections = 1886 t->nonSpeculativeAcquires + t->successfulSpeculations; 1887 kmp_uint32 totalSpeculations = t->successfulSpeculations + 1888 t->hardFailedSpeculations + 1889 t->softFailedSpeculations; 1890 if (totalSections <= 0) 1891 return; 1892 1893 kmp_safe_raii_file_t statsFile; 1894 if (strcmp(__kmp_speculative_statsfile, "-") == 0) { 1895 statsFile.set_stdout(); 1896 } else { 1897 size_t buffLen = KMP_STRLEN(__kmp_speculative_statsfile) + 20; 1898 char buffer[buffLen]; 1899 KMP_SNPRINTF(&buffer[0], buffLen, __kmp_speculative_statsfile, 1900 (kmp_int32)getpid()); 1901 statsFile.open(buffer, "w"); 1902 } 1903 1904 fprintf(statsFile, "Speculative lock statistics (all approximate!)\n"); 1905 fprintf(statsFile, 1906 " Lock parameters: \n" 1907 " max_soft_retries : %10d\n" 1908 " max_badness : %10d\n", 1909 __kmp_adaptive_backoff_params.max_soft_retries, 1910 __kmp_adaptive_backoff_params.max_badness); 1911 fprintf(statsFile, " Non-speculative acquire attempts : %10d\n", 1912 t->nonSpeculativeAcquireAttempts); 1913 fprintf(statsFile, " Total critical sections : %10d\n", 1914 totalSections); 1915 fprintf(statsFile, " Successful speculations : %10d (%5.1f%%)\n", 1916 t->successfulSpeculations, 1917 percent(t->successfulSpeculations, totalSections)); 1918 fprintf(statsFile, " Non-speculative acquires : %10d (%5.1f%%)\n", 1919 t->nonSpeculativeAcquires, 1920 percent(t->nonSpeculativeAcquires, totalSections)); 1921 fprintf(statsFile, " Lemming yields : %10d\n\n", 1922 t->lemmingYields); 1923 1924 fprintf(statsFile, " Speculative acquire attempts : %10d\n", 1925 totalSpeculations); 1926 fprintf(statsFile, " Successes : %10d (%5.1f%%)\n", 1927 t->successfulSpeculations, 1928 percent(t->successfulSpeculations, totalSpeculations)); 1929 fprintf(statsFile, " Soft failures : %10d (%5.1f%%)\n", 1930 t->softFailedSpeculations, 1931 percent(t->softFailedSpeculations, totalSpeculations)); 1932 fprintf(statsFile, " Hard failures : %10d (%5.1f%%)\n", 1933 t->hardFailedSpeculations, 1934 percent(t->hardFailedSpeculations, totalSpeculations)); 1935 } 1936 1937 #define KMP_INC_STAT(lck, stat) (lck->lk.adaptive.stats.stat++) 1938 #else 1939 #define KMP_INC_STAT(lck, stat) 1940 1941 #endif // KMP_DEBUG_ADAPTIVE_LOCKS 1942 1943 static inline bool __kmp_is_unlocked_queuing_lock(kmp_queuing_lock_t *lck) { 1944 // It is enough to check that the head_id is zero. 1945 // We don't also need to check the tail. 1946 bool res = lck->lk.head_id == 0; 1947 1948 // We need a fence here, since we must ensure that no memory operations 1949 // from later in this thread float above that read. 1950 #if KMP_COMPILER_ICC 1951 _mm_mfence(); 1952 #else 1953 __sync_synchronize(); 1954 #endif 1955 1956 return res; 1957 } 1958 1959 // Functions for manipulating the badness 1960 static __inline void 1961 __kmp_update_badness_after_success(kmp_adaptive_lock_t *lck) { 1962 // Reset the badness to zero so we eagerly try to speculate again 1963 lck->lk.adaptive.badness = 0; 1964 KMP_INC_STAT(lck, successfulSpeculations); 1965 } 1966 1967 // Create a bit mask with one more set bit. 1968 static __inline void __kmp_step_badness(kmp_adaptive_lock_t *lck) { 1969 kmp_uint32 newBadness = (lck->lk.adaptive.badness << 1) | 1; 1970 if (newBadness > lck->lk.adaptive.max_badness) { 1971 return; 1972 } else { 1973 lck->lk.adaptive.badness = newBadness; 1974 } 1975 } 1976 1977 // Check whether speculation should be attempted. 1978 KMP_ATTRIBUTE_TARGET_RTM 1979 static __inline int __kmp_should_speculate(kmp_adaptive_lock_t *lck, 1980 kmp_int32 gtid) { 1981 kmp_uint32 badness = lck->lk.adaptive.badness; 1982 kmp_uint32 attempts = lck->lk.adaptive.acquire_attempts; 1983 int res = (attempts & badness) == 0; 1984 return res; 1985 } 1986 1987 // Attempt to acquire only the speculative lock. 1988 // Does not back off to the non-speculative lock. 1989 KMP_ATTRIBUTE_TARGET_RTM 1990 static int __kmp_test_adaptive_lock_only(kmp_adaptive_lock_t *lck, 1991 kmp_int32 gtid) { 1992 int retries = lck->lk.adaptive.max_soft_retries; 1993 1994 // We don't explicitly count the start of speculation, rather we record the 1995 // results (success, hard fail, soft fail). The sum of all of those is the 1996 // total number of times we started speculation since all speculations must 1997 // end one of those ways. 1998 do { 1999 kmp_uint32 status = _xbegin(); 2000 // Switch this in to disable actual speculation but exercise at least some 2001 // of the rest of the code. Useful for debugging... 2002 // kmp_uint32 status = _XABORT_NESTED; 2003 2004 if (status == _XBEGIN_STARTED) { 2005 /* We have successfully started speculation. Check that no-one acquired 2006 the lock for real between when we last looked and now. This also gets 2007 the lock cache line into our read-set, which we need so that we'll 2008 abort if anyone later claims it for real. */ 2009 if (!__kmp_is_unlocked_queuing_lock(GET_QLK_PTR(lck))) { 2010 // Lock is now visibly acquired, so someone beat us to it. Abort the 2011 // transaction so we'll restart from _xbegin with the failure status. 2012 _xabort(0x01); 2013 KMP_ASSERT2(0, "should not get here"); 2014 } 2015 return 1; // Lock has been acquired (speculatively) 2016 } else { 2017 // We have aborted, update the statistics 2018 if (status & SOFT_ABORT_MASK) { 2019 KMP_INC_STAT(lck, softFailedSpeculations); 2020 // and loop round to retry. 2021 } else { 2022 KMP_INC_STAT(lck, hardFailedSpeculations); 2023 // Give up if we had a hard failure. 2024 break; 2025 } 2026 } 2027 } while (retries--); // Loop while we have retries, and didn't fail hard. 2028 2029 // Either we had a hard failure or we didn't succeed softly after 2030 // the full set of attempts, so back off the badness. 2031 __kmp_step_badness(lck); 2032 return 0; 2033 } 2034 2035 // Attempt to acquire the speculative lock, or back off to the non-speculative 2036 // one if the speculative lock cannot be acquired. 2037 // We can succeed speculatively, non-speculatively, or fail. 2038 static int __kmp_test_adaptive_lock(kmp_adaptive_lock_t *lck, kmp_int32 gtid) { 2039 // First try to acquire the lock speculatively 2040 if (__kmp_should_speculate(lck, gtid) && 2041 __kmp_test_adaptive_lock_only(lck, gtid)) 2042 return 1; 2043 2044 // Speculative acquisition failed, so try to acquire it non-speculatively. 2045 // Count the non-speculative acquire attempt 2046 lck->lk.adaptive.acquire_attempts++; 2047 2048 // Use base, non-speculative lock. 2049 if (__kmp_test_queuing_lock(GET_QLK_PTR(lck), gtid)) { 2050 KMP_INC_STAT(lck, nonSpeculativeAcquires); 2051 return 1; // Lock is acquired (non-speculatively) 2052 } else { 2053 return 0; // Failed to acquire the lock, it's already visibly locked. 2054 } 2055 } 2056 2057 static int __kmp_test_adaptive_lock_with_checks(kmp_adaptive_lock_t *lck, 2058 kmp_int32 gtid) { 2059 char const *const func = "omp_test_lock"; 2060 if (lck->lk.qlk.initialized != GET_QLK_PTR(lck)) { 2061 KMP_FATAL(LockIsUninitialized, func); 2062 } 2063 2064 int retval = __kmp_test_adaptive_lock(lck, gtid); 2065 2066 if (retval) { 2067 lck->lk.qlk.owner_id = gtid + 1; 2068 } 2069 return retval; 2070 } 2071 2072 // Block until we can acquire a speculative, adaptive lock. We check whether we 2073 // should be trying to speculate. If we should be, we check the real lock to see 2074 // if it is free, and, if not, pause without attempting to acquire it until it 2075 // is. Then we try the speculative acquire. This means that although we suffer 2076 // from lemmings a little (because all we can't acquire the lock speculatively 2077 // until the queue of threads waiting has cleared), we don't get into a state 2078 // where we can never acquire the lock speculatively (because we force the queue 2079 // to clear by preventing new arrivals from entering the queue). This does mean 2080 // that when we're trying to break lemmings, the lock is no longer fair. However 2081 // OpenMP makes no guarantee that its locks are fair, so this isn't a real 2082 // problem. 2083 static void __kmp_acquire_adaptive_lock(kmp_adaptive_lock_t *lck, 2084 kmp_int32 gtid) { 2085 if (__kmp_should_speculate(lck, gtid)) { 2086 if (__kmp_is_unlocked_queuing_lock(GET_QLK_PTR(lck))) { 2087 if (__kmp_test_adaptive_lock_only(lck, gtid)) 2088 return; 2089 // We tried speculation and failed, so give up. 2090 } else { 2091 // We can't try speculation until the lock is free, so we pause here 2092 // (without suspending on the queueing lock, to allow it to drain, then 2093 // try again. All other threads will also see the same result for 2094 // shouldSpeculate, so will be doing the same if they try to claim the 2095 // lock from now on. 2096 while (!__kmp_is_unlocked_queuing_lock(GET_QLK_PTR(lck))) { 2097 KMP_INC_STAT(lck, lemmingYields); 2098 KMP_YIELD(TRUE); 2099 } 2100 2101 if (__kmp_test_adaptive_lock_only(lck, gtid)) 2102 return; 2103 } 2104 } 2105 2106 // Speculative acquisition failed, so acquire it non-speculatively. 2107 // Count the non-speculative acquire attempt 2108 lck->lk.adaptive.acquire_attempts++; 2109 2110 __kmp_acquire_queuing_lock_timed_template<FALSE>(GET_QLK_PTR(lck), gtid); 2111 // We have acquired the base lock, so count that. 2112 KMP_INC_STAT(lck, nonSpeculativeAcquires); 2113 } 2114 2115 static void __kmp_acquire_adaptive_lock_with_checks(kmp_adaptive_lock_t *lck, 2116 kmp_int32 gtid) { 2117 char const *const func = "omp_set_lock"; 2118 if (lck->lk.qlk.initialized != GET_QLK_PTR(lck)) { 2119 KMP_FATAL(LockIsUninitialized, func); 2120 } 2121 if (__kmp_get_queuing_lock_owner(GET_QLK_PTR(lck)) == gtid) { 2122 KMP_FATAL(LockIsAlreadyOwned, func); 2123 } 2124 2125 __kmp_acquire_adaptive_lock(lck, gtid); 2126 2127 lck->lk.qlk.owner_id = gtid + 1; 2128 } 2129 2130 KMP_ATTRIBUTE_TARGET_RTM 2131 static int __kmp_release_adaptive_lock(kmp_adaptive_lock_t *lck, 2132 kmp_int32 gtid) { 2133 if (__kmp_is_unlocked_queuing_lock(GET_QLK_PTR( 2134 lck))) { // If the lock doesn't look claimed we must be speculating. 2135 // (Or the user's code is buggy and they're releasing without locking; 2136 // if we had XTEST we'd be able to check that case...) 2137 _xend(); // Exit speculation 2138 __kmp_update_badness_after_success(lck); 2139 } else { // Since the lock *is* visibly locked we're not speculating, 2140 // so should use the underlying lock's release scheme. 2141 __kmp_release_queuing_lock(GET_QLK_PTR(lck), gtid); 2142 } 2143 return KMP_LOCK_RELEASED; 2144 } 2145 2146 static int __kmp_release_adaptive_lock_with_checks(kmp_adaptive_lock_t *lck, 2147 kmp_int32 gtid) { 2148 char const *const func = "omp_unset_lock"; 2149 KMP_MB(); /* in case another processor initialized lock */ 2150 if (lck->lk.qlk.initialized != GET_QLK_PTR(lck)) { 2151 KMP_FATAL(LockIsUninitialized, func); 2152 } 2153 if (__kmp_get_queuing_lock_owner(GET_QLK_PTR(lck)) == -1) { 2154 KMP_FATAL(LockUnsettingFree, func); 2155 } 2156 if (__kmp_get_queuing_lock_owner(GET_QLK_PTR(lck)) != gtid) { 2157 KMP_FATAL(LockUnsettingSetByAnother, func); 2158 } 2159 lck->lk.qlk.owner_id = 0; 2160 __kmp_release_adaptive_lock(lck, gtid); 2161 return KMP_LOCK_RELEASED; 2162 } 2163 2164 static void __kmp_init_adaptive_lock(kmp_adaptive_lock_t *lck) { 2165 __kmp_init_queuing_lock(GET_QLK_PTR(lck)); 2166 lck->lk.adaptive.badness = 0; 2167 lck->lk.adaptive.acquire_attempts = 0; // nonSpeculativeAcquireAttempts = 0; 2168 lck->lk.adaptive.max_soft_retries = 2169 __kmp_adaptive_backoff_params.max_soft_retries; 2170 lck->lk.adaptive.max_badness = __kmp_adaptive_backoff_params.max_badness; 2171 #if KMP_DEBUG_ADAPTIVE_LOCKS 2172 __kmp_zero_speculative_stats(&lck->lk.adaptive); 2173 #endif 2174 KA_TRACE(1000, ("__kmp_init_adaptive_lock: lock %p initialized\n", lck)); 2175 } 2176 2177 static void __kmp_destroy_adaptive_lock(kmp_adaptive_lock_t *lck) { 2178 #if KMP_DEBUG_ADAPTIVE_LOCKS 2179 __kmp_accumulate_speculative_stats(&lck->lk.adaptive); 2180 #endif 2181 __kmp_destroy_queuing_lock(GET_QLK_PTR(lck)); 2182 // Nothing needed for the speculative part. 2183 } 2184 2185 static void __kmp_destroy_adaptive_lock_with_checks(kmp_adaptive_lock_t *lck) { 2186 char const *const func = "omp_destroy_lock"; 2187 if (lck->lk.qlk.initialized != GET_QLK_PTR(lck)) { 2188 KMP_FATAL(LockIsUninitialized, func); 2189 } 2190 if (__kmp_get_queuing_lock_owner(GET_QLK_PTR(lck)) != -1) { 2191 KMP_FATAL(LockStillOwned, func); 2192 } 2193 __kmp_destroy_adaptive_lock(lck); 2194 } 2195 2196 #endif // KMP_USE_ADAPTIVE_LOCKS 2197 2198 /* ------------------------------------------------------------------------ */ 2199 /* DRDPA ticket locks */ 2200 /* "DRDPA" means Dynamically Reconfigurable Distributed Polling Area */ 2201 2202 static kmp_int32 __kmp_get_drdpa_lock_owner(kmp_drdpa_lock_t *lck) { 2203 return lck->lk.owner_id - 1; 2204 } 2205 2206 static inline bool __kmp_is_drdpa_lock_nestable(kmp_drdpa_lock_t *lck) { 2207 return lck->lk.depth_locked != -1; 2208 } 2209 2210 __forceinline static int 2211 __kmp_acquire_drdpa_lock_timed_template(kmp_drdpa_lock_t *lck, kmp_int32 gtid) { 2212 kmp_uint64 ticket = KMP_ATOMIC_INC(&lck->lk.next_ticket); 2213 kmp_uint64 mask = lck->lk.mask; // atomic load 2214 std::atomic<kmp_uint64> *polls = lck->lk.polls; 2215 2216 #ifdef USE_LOCK_PROFILE 2217 if (polls[ticket & mask] != ticket) 2218 __kmp_printf("LOCK CONTENTION: %p\n", lck); 2219 /* else __kmp_printf( "." );*/ 2220 #endif /* USE_LOCK_PROFILE */ 2221 2222 // Now spin-wait, but reload the polls pointer and mask, in case the 2223 // polling area has been reconfigured. Unless it is reconfigured, the 2224 // reloads stay in L1 cache and are cheap. 2225 // 2226 // Keep this code in sync with KMP_WAIT, in kmp_dispatch.cpp !!! 2227 // The current implementation of KMP_WAIT doesn't allow for mask 2228 // and poll to be re-read every spin iteration. 2229 kmp_uint32 spins; 2230 KMP_FSYNC_PREPARE(lck); 2231 KMP_INIT_YIELD(spins); 2232 while (polls[ticket & mask] < ticket) { // atomic load 2233 KMP_YIELD_OVERSUB_ELSE_SPIN(spins); 2234 // Re-read the mask and the poll pointer from the lock structure. 2235 // 2236 // Make certain that "mask" is read before "polls" !!! 2237 // 2238 // If another thread picks reconfigures the polling area and updates their 2239 // values, and we get the new value of mask and the old polls pointer, we 2240 // could access memory beyond the end of the old polling area. 2241 mask = lck->lk.mask; // atomic load 2242 polls = lck->lk.polls; // atomic load 2243 } 2244 2245 // Critical section starts here 2246 KMP_FSYNC_ACQUIRED(lck); 2247 KA_TRACE(1000, ("__kmp_acquire_drdpa_lock: ticket #%lld acquired lock %p\n", 2248 ticket, lck)); 2249 lck->lk.now_serving = ticket; // non-volatile store 2250 2251 // Deallocate a garbage polling area if we know that we are the last 2252 // thread that could possibly access it. 2253 // 2254 // The >= check is in case __kmp_test_drdpa_lock() allocated the cleanup 2255 // ticket. 2256 if ((lck->lk.old_polls != NULL) && (ticket >= lck->lk.cleanup_ticket)) { 2257 __kmp_free(lck->lk.old_polls); 2258 lck->lk.old_polls = NULL; 2259 lck->lk.cleanup_ticket = 0; 2260 } 2261 2262 // Check to see if we should reconfigure the polling area. 2263 // If there is still a garbage polling area to be deallocated from a 2264 // previous reconfiguration, let a later thread reconfigure it. 2265 if (lck->lk.old_polls == NULL) { 2266 bool reconfigure = false; 2267 std::atomic<kmp_uint64> *old_polls = polls; 2268 kmp_uint32 num_polls = TCR_4(lck->lk.num_polls); 2269 2270 if (TCR_4(__kmp_nth) > 2271 (__kmp_avail_proc ? __kmp_avail_proc : __kmp_xproc)) { 2272 // We are in oversubscription mode. Contract the polling area 2273 // down to a single location, if that hasn't been done already. 2274 if (num_polls > 1) { 2275 reconfigure = true; 2276 num_polls = TCR_4(lck->lk.num_polls); 2277 mask = 0; 2278 num_polls = 1; 2279 polls = (std::atomic<kmp_uint64> *)__kmp_allocate(num_polls * 2280 sizeof(*polls)); 2281 polls[0] = ticket; 2282 } 2283 } else { 2284 // We are in under/fully subscribed mode. Check the number of 2285 // threads waiting on the lock. The size of the polling area 2286 // should be at least the number of threads waiting. 2287 kmp_uint64 num_waiting = TCR_8(lck->lk.next_ticket) - ticket - 1; 2288 if (num_waiting > num_polls) { 2289 kmp_uint32 old_num_polls = num_polls; 2290 reconfigure = true; 2291 do { 2292 mask = (mask << 1) | 1; 2293 num_polls *= 2; 2294 } while (num_polls <= num_waiting); 2295 2296 // Allocate the new polling area, and copy the relevant portion 2297 // of the old polling area to the new area. __kmp_allocate() 2298 // zeroes the memory it allocates, and most of the old area is 2299 // just zero padding, so we only copy the release counters. 2300 polls = (std::atomic<kmp_uint64> *)__kmp_allocate(num_polls * 2301 sizeof(*polls)); 2302 kmp_uint32 i; 2303 for (i = 0; i < old_num_polls; i++) { 2304 polls[i].store(old_polls[i]); 2305 } 2306 } 2307 } 2308 2309 if (reconfigure) { 2310 // Now write the updated fields back to the lock structure. 2311 // 2312 // Make certain that "polls" is written before "mask" !!! 2313 // 2314 // If another thread picks up the new value of mask and the old polls 2315 // pointer , it could access memory beyond the end of the old polling 2316 // area. 2317 // 2318 // On x86, we need memory fences. 2319 KA_TRACE(1000, ("__kmp_acquire_drdpa_lock: ticket #%lld reconfiguring " 2320 "lock %p to %d polls\n", 2321 ticket, lck, num_polls)); 2322 2323 lck->lk.old_polls = old_polls; 2324 lck->lk.polls = polls; // atomic store 2325 2326 KMP_MB(); 2327 2328 lck->lk.num_polls = num_polls; 2329 lck->lk.mask = mask; // atomic store 2330 2331 KMP_MB(); 2332 2333 // Only after the new polling area and mask have been flushed 2334 // to main memory can we update the cleanup ticket field. 2335 // 2336 // volatile load / non-volatile store 2337 lck->lk.cleanup_ticket = lck->lk.next_ticket; 2338 } 2339 } 2340 return KMP_LOCK_ACQUIRED_FIRST; 2341 } 2342 2343 int __kmp_acquire_drdpa_lock(kmp_drdpa_lock_t *lck, kmp_int32 gtid) { 2344 int retval = __kmp_acquire_drdpa_lock_timed_template(lck, gtid); 2345 return retval; 2346 } 2347 2348 static int __kmp_acquire_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck, 2349 kmp_int32 gtid) { 2350 char const *const func = "omp_set_lock"; 2351 if (lck->lk.initialized != lck) { 2352 KMP_FATAL(LockIsUninitialized, func); 2353 } 2354 if (__kmp_is_drdpa_lock_nestable(lck)) { 2355 KMP_FATAL(LockNestableUsedAsSimple, func); 2356 } 2357 if ((gtid >= 0) && (__kmp_get_drdpa_lock_owner(lck) == gtid)) { 2358 KMP_FATAL(LockIsAlreadyOwned, func); 2359 } 2360 2361 __kmp_acquire_drdpa_lock(lck, gtid); 2362 2363 lck->lk.owner_id = gtid + 1; 2364 return KMP_LOCK_ACQUIRED_FIRST; 2365 } 2366 2367 int __kmp_test_drdpa_lock(kmp_drdpa_lock_t *lck, kmp_int32 gtid) { 2368 // First get a ticket, then read the polls pointer and the mask. 2369 // The polls pointer must be read before the mask!!! (See above) 2370 kmp_uint64 ticket = lck->lk.next_ticket; // atomic load 2371 std::atomic<kmp_uint64> *polls = lck->lk.polls; 2372 kmp_uint64 mask = lck->lk.mask; // atomic load 2373 if (polls[ticket & mask] == ticket) { 2374 kmp_uint64 next_ticket = ticket + 1; 2375 if (__kmp_atomic_compare_store_acq(&lck->lk.next_ticket, ticket, 2376 next_ticket)) { 2377 KMP_FSYNC_ACQUIRED(lck); 2378 KA_TRACE(1000, ("__kmp_test_drdpa_lock: ticket #%lld acquired lock %p\n", 2379 ticket, lck)); 2380 lck->lk.now_serving = ticket; // non-volatile store 2381 2382 // Since no threads are waiting, there is no possibility that we would 2383 // want to reconfigure the polling area. We might have the cleanup ticket 2384 // value (which says that it is now safe to deallocate old_polls), but 2385 // we'll let a later thread which calls __kmp_acquire_lock do that - this 2386 // routine isn't supposed to block, and we would risk blocks if we called 2387 // __kmp_free() to do the deallocation. 2388 return TRUE; 2389 } 2390 } 2391 return FALSE; 2392 } 2393 2394 static int __kmp_test_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck, 2395 kmp_int32 gtid) { 2396 char const *const func = "omp_test_lock"; 2397 if (lck->lk.initialized != lck) { 2398 KMP_FATAL(LockIsUninitialized, func); 2399 } 2400 if (__kmp_is_drdpa_lock_nestable(lck)) { 2401 KMP_FATAL(LockNestableUsedAsSimple, func); 2402 } 2403 2404 int retval = __kmp_test_drdpa_lock(lck, gtid); 2405 2406 if (retval) { 2407 lck->lk.owner_id = gtid + 1; 2408 } 2409 return retval; 2410 } 2411 2412 int __kmp_release_drdpa_lock(kmp_drdpa_lock_t *lck, kmp_int32 gtid) { 2413 // Read the ticket value from the lock data struct, then the polls pointer and 2414 // the mask. The polls pointer must be read before the mask!!! (See above) 2415 kmp_uint64 ticket = lck->lk.now_serving + 1; // non-atomic load 2416 std::atomic<kmp_uint64> *polls = lck->lk.polls; // atomic load 2417 kmp_uint64 mask = lck->lk.mask; // atomic load 2418 KA_TRACE(1000, ("__kmp_release_drdpa_lock: ticket #%lld released lock %p\n", 2419 ticket - 1, lck)); 2420 KMP_FSYNC_RELEASING(lck); 2421 polls[ticket & mask] = ticket; // atomic store 2422 return KMP_LOCK_RELEASED; 2423 } 2424 2425 static int __kmp_release_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck, 2426 kmp_int32 gtid) { 2427 char const *const func = "omp_unset_lock"; 2428 KMP_MB(); /* in case another processor initialized lock */ 2429 if (lck->lk.initialized != lck) { 2430 KMP_FATAL(LockIsUninitialized, func); 2431 } 2432 if (__kmp_is_drdpa_lock_nestable(lck)) { 2433 KMP_FATAL(LockNestableUsedAsSimple, func); 2434 } 2435 if (__kmp_get_drdpa_lock_owner(lck) == -1) { 2436 KMP_FATAL(LockUnsettingFree, func); 2437 } 2438 if ((gtid >= 0) && (__kmp_get_drdpa_lock_owner(lck) >= 0) && 2439 (__kmp_get_drdpa_lock_owner(lck) != gtid)) { 2440 KMP_FATAL(LockUnsettingSetByAnother, func); 2441 } 2442 lck->lk.owner_id = 0; 2443 return __kmp_release_drdpa_lock(lck, gtid); 2444 } 2445 2446 void __kmp_init_drdpa_lock(kmp_drdpa_lock_t *lck) { 2447 lck->lk.location = NULL; 2448 lck->lk.mask = 0; 2449 lck->lk.num_polls = 1; 2450 lck->lk.polls = (std::atomic<kmp_uint64> *)__kmp_allocate( 2451 lck->lk.num_polls * sizeof(*(lck->lk.polls))); 2452 lck->lk.cleanup_ticket = 0; 2453 lck->lk.old_polls = NULL; 2454 lck->lk.next_ticket = 0; 2455 lck->lk.now_serving = 0; 2456 lck->lk.owner_id = 0; // no thread owns the lock. 2457 lck->lk.depth_locked = -1; // >= 0 for nestable locks, -1 for simple locks. 2458 lck->lk.initialized = lck; 2459 2460 KA_TRACE(1000, ("__kmp_init_drdpa_lock: lock %p initialized\n", lck)); 2461 } 2462 2463 void __kmp_destroy_drdpa_lock(kmp_drdpa_lock_t *lck) { 2464 lck->lk.initialized = NULL; 2465 lck->lk.location = NULL; 2466 if (lck->lk.polls.load() != NULL) { 2467 __kmp_free(lck->lk.polls.load()); 2468 lck->lk.polls = NULL; 2469 } 2470 if (lck->lk.old_polls != NULL) { 2471 __kmp_free(lck->lk.old_polls); 2472 lck->lk.old_polls = NULL; 2473 } 2474 lck->lk.mask = 0; 2475 lck->lk.num_polls = 0; 2476 lck->lk.cleanup_ticket = 0; 2477 lck->lk.next_ticket = 0; 2478 lck->lk.now_serving = 0; 2479 lck->lk.owner_id = 0; 2480 lck->lk.depth_locked = -1; 2481 } 2482 2483 static void __kmp_destroy_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck) { 2484 char const *const func = "omp_destroy_lock"; 2485 if (lck->lk.initialized != lck) { 2486 KMP_FATAL(LockIsUninitialized, func); 2487 } 2488 if (__kmp_is_drdpa_lock_nestable(lck)) { 2489 KMP_FATAL(LockNestableUsedAsSimple, func); 2490 } 2491 if (__kmp_get_drdpa_lock_owner(lck) != -1) { 2492 KMP_FATAL(LockStillOwned, func); 2493 } 2494 __kmp_destroy_drdpa_lock(lck); 2495 } 2496 2497 // nested drdpa ticket locks 2498 2499 int __kmp_acquire_nested_drdpa_lock(kmp_drdpa_lock_t *lck, kmp_int32 gtid) { 2500 KMP_DEBUG_ASSERT(gtid >= 0); 2501 2502 if (__kmp_get_drdpa_lock_owner(lck) == gtid) { 2503 lck->lk.depth_locked += 1; 2504 return KMP_LOCK_ACQUIRED_NEXT; 2505 } else { 2506 __kmp_acquire_drdpa_lock_timed_template(lck, gtid); 2507 KMP_MB(); 2508 lck->lk.depth_locked = 1; 2509 KMP_MB(); 2510 lck->lk.owner_id = gtid + 1; 2511 return KMP_LOCK_ACQUIRED_FIRST; 2512 } 2513 } 2514 2515 static void __kmp_acquire_nested_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck, 2516 kmp_int32 gtid) { 2517 char const *const func = "omp_set_nest_lock"; 2518 if (lck->lk.initialized != lck) { 2519 KMP_FATAL(LockIsUninitialized, func); 2520 } 2521 if (!__kmp_is_drdpa_lock_nestable(lck)) { 2522 KMP_FATAL(LockSimpleUsedAsNestable, func); 2523 } 2524 __kmp_acquire_nested_drdpa_lock(lck, gtid); 2525 } 2526 2527 int __kmp_test_nested_drdpa_lock(kmp_drdpa_lock_t *lck, kmp_int32 gtid) { 2528 int retval; 2529 2530 KMP_DEBUG_ASSERT(gtid >= 0); 2531 2532 if (__kmp_get_drdpa_lock_owner(lck) == gtid) { 2533 retval = ++lck->lk.depth_locked; 2534 } else if (!__kmp_test_drdpa_lock(lck, gtid)) { 2535 retval = 0; 2536 } else { 2537 KMP_MB(); 2538 retval = lck->lk.depth_locked = 1; 2539 KMP_MB(); 2540 lck->lk.owner_id = gtid + 1; 2541 } 2542 return retval; 2543 } 2544 2545 static int __kmp_test_nested_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck, 2546 kmp_int32 gtid) { 2547 char const *const func = "omp_test_nest_lock"; 2548 if (lck->lk.initialized != lck) { 2549 KMP_FATAL(LockIsUninitialized, func); 2550 } 2551 if (!__kmp_is_drdpa_lock_nestable(lck)) { 2552 KMP_FATAL(LockSimpleUsedAsNestable, func); 2553 } 2554 return __kmp_test_nested_drdpa_lock(lck, gtid); 2555 } 2556 2557 int __kmp_release_nested_drdpa_lock(kmp_drdpa_lock_t *lck, kmp_int32 gtid) { 2558 KMP_DEBUG_ASSERT(gtid >= 0); 2559 2560 KMP_MB(); 2561 if (--(lck->lk.depth_locked) == 0) { 2562 KMP_MB(); 2563 lck->lk.owner_id = 0; 2564 __kmp_release_drdpa_lock(lck, gtid); 2565 return KMP_LOCK_RELEASED; 2566 } 2567 return KMP_LOCK_STILL_HELD; 2568 } 2569 2570 static int __kmp_release_nested_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck, 2571 kmp_int32 gtid) { 2572 char const *const func = "omp_unset_nest_lock"; 2573 KMP_MB(); /* in case another processor initialized lock */ 2574 if (lck->lk.initialized != lck) { 2575 KMP_FATAL(LockIsUninitialized, func); 2576 } 2577 if (!__kmp_is_drdpa_lock_nestable(lck)) { 2578 KMP_FATAL(LockSimpleUsedAsNestable, func); 2579 } 2580 if (__kmp_get_drdpa_lock_owner(lck) == -1) { 2581 KMP_FATAL(LockUnsettingFree, func); 2582 } 2583 if (__kmp_get_drdpa_lock_owner(lck) != gtid) { 2584 KMP_FATAL(LockUnsettingSetByAnother, func); 2585 } 2586 return __kmp_release_nested_drdpa_lock(lck, gtid); 2587 } 2588 2589 void __kmp_init_nested_drdpa_lock(kmp_drdpa_lock_t *lck) { 2590 __kmp_init_drdpa_lock(lck); 2591 lck->lk.depth_locked = 0; // >= 0 for nestable locks, -1 for simple locks 2592 } 2593 2594 void __kmp_destroy_nested_drdpa_lock(kmp_drdpa_lock_t *lck) { 2595 __kmp_destroy_drdpa_lock(lck); 2596 lck->lk.depth_locked = 0; 2597 } 2598 2599 static void __kmp_destroy_nested_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck) { 2600 char const *const func = "omp_destroy_nest_lock"; 2601 if (lck->lk.initialized != lck) { 2602 KMP_FATAL(LockIsUninitialized, func); 2603 } 2604 if (!__kmp_is_drdpa_lock_nestable(lck)) { 2605 KMP_FATAL(LockSimpleUsedAsNestable, func); 2606 } 2607 if (__kmp_get_drdpa_lock_owner(lck) != -1) { 2608 KMP_FATAL(LockStillOwned, func); 2609 } 2610 __kmp_destroy_nested_drdpa_lock(lck); 2611 } 2612 2613 // access functions to fields which don't exist for all lock kinds. 2614 2615 static const ident_t *__kmp_get_drdpa_lock_location(kmp_drdpa_lock_t *lck) { 2616 return lck->lk.location; 2617 } 2618 2619 static void __kmp_set_drdpa_lock_location(kmp_drdpa_lock_t *lck, 2620 const ident_t *loc) { 2621 lck->lk.location = loc; 2622 } 2623 2624 static kmp_lock_flags_t __kmp_get_drdpa_lock_flags(kmp_drdpa_lock_t *lck) { 2625 return lck->lk.flags; 2626 } 2627 2628 static void __kmp_set_drdpa_lock_flags(kmp_drdpa_lock_t *lck, 2629 kmp_lock_flags_t flags) { 2630 lck->lk.flags = flags; 2631 } 2632 2633 // Time stamp counter 2634 #if KMP_ARCH_X86 || KMP_ARCH_X86_64 2635 #define __kmp_tsc() __kmp_hardware_timestamp() 2636 // Runtime's default backoff parameters 2637 kmp_backoff_t __kmp_spin_backoff_params = {1, 4096, 100}; 2638 #else 2639 // Use nanoseconds for other platforms 2640 extern kmp_uint64 __kmp_now_nsec(); 2641 kmp_backoff_t __kmp_spin_backoff_params = {1, 256, 100}; 2642 #define __kmp_tsc() __kmp_now_nsec() 2643 #endif 2644 2645 // A useful predicate for dealing with timestamps that may wrap. 2646 // Is a before b? Since the timestamps may wrap, this is asking whether it's 2647 // shorter to go clockwise from a to b around the clock-face, or anti-clockwise. 2648 // Times where going clockwise is less distance than going anti-clockwise 2649 // are in the future, others are in the past. e.g. a = MAX-1, b = MAX+1 (=0), 2650 // then a > b (true) does not mean a reached b; whereas signed(a) = -2, 2651 // signed(b) = 0 captures the actual difference 2652 static inline bool before(kmp_uint64 a, kmp_uint64 b) { 2653 return ((kmp_int64)b - (kmp_int64)a) > 0; 2654 } 2655 2656 // Truncated binary exponential backoff function 2657 void __kmp_spin_backoff(kmp_backoff_t *boff) { 2658 // We could flatten this loop, but making it a nested loop gives better result 2659 kmp_uint32 i; 2660 for (i = boff->step; i > 0; i--) { 2661 kmp_uint64 goal = __kmp_tsc() + boff->min_tick; 2662 do { 2663 KMP_CPU_PAUSE(); 2664 } while (before(__kmp_tsc(), goal)); 2665 } 2666 boff->step = (boff->step << 1 | 1) & (boff->max_backoff - 1); 2667 } 2668 2669 #if KMP_USE_DYNAMIC_LOCK 2670 2671 // Direct lock initializers. It simply writes a tag to the low 8 bits of the 2672 // lock word. 2673 static void __kmp_init_direct_lock(kmp_dyna_lock_t *lck, 2674 kmp_dyna_lockseq_t seq) { 2675 TCW_4(*lck, KMP_GET_D_TAG(seq)); 2676 KA_TRACE( 2677 20, 2678 ("__kmp_init_direct_lock: initialized direct lock with type#%d\n", seq)); 2679 } 2680 2681 #if KMP_USE_TSX 2682 2683 // HLE lock functions - imported from the testbed runtime. 2684 #define HLE_ACQUIRE ".byte 0xf2;" 2685 #define HLE_RELEASE ".byte 0xf3;" 2686 2687 static inline kmp_uint32 swap4(kmp_uint32 volatile *p, kmp_uint32 v) { 2688 __asm__ volatile(HLE_ACQUIRE "xchg %1,%0" : "+r"(v), "+m"(*p) : : "memory"); 2689 return v; 2690 } 2691 2692 static void __kmp_destroy_hle_lock(kmp_dyna_lock_t *lck) { TCW_4(*lck, 0); } 2693 2694 static void __kmp_destroy_hle_lock_with_checks(kmp_dyna_lock_t *lck) { 2695 TCW_4(*lck, 0); 2696 } 2697 2698 static void __kmp_acquire_hle_lock(kmp_dyna_lock_t *lck, kmp_int32 gtid) { 2699 // Use gtid for KMP_LOCK_BUSY if necessary 2700 if (swap4(lck, KMP_LOCK_BUSY(1, hle)) != KMP_LOCK_FREE(hle)) { 2701 int delay = 1; 2702 do { 2703 while (*(kmp_uint32 volatile *)lck != KMP_LOCK_FREE(hle)) { 2704 for (int i = delay; i != 0; --i) 2705 KMP_CPU_PAUSE(); 2706 delay = ((delay << 1) | 1) & 7; 2707 } 2708 } while (swap4(lck, KMP_LOCK_BUSY(1, hle)) != KMP_LOCK_FREE(hle)); 2709 } 2710 } 2711 2712 static void __kmp_acquire_hle_lock_with_checks(kmp_dyna_lock_t *lck, 2713 kmp_int32 gtid) { 2714 __kmp_acquire_hle_lock(lck, gtid); // TODO: add checks 2715 } 2716 2717 static int __kmp_release_hle_lock(kmp_dyna_lock_t *lck, kmp_int32 gtid) { 2718 __asm__ volatile(HLE_RELEASE "movl %1,%0" 2719 : "=m"(*lck) 2720 : "r"(KMP_LOCK_FREE(hle)) 2721 : "memory"); 2722 return KMP_LOCK_RELEASED; 2723 } 2724 2725 static int __kmp_release_hle_lock_with_checks(kmp_dyna_lock_t *lck, 2726 kmp_int32 gtid) { 2727 return __kmp_release_hle_lock(lck, gtid); // TODO: add checks 2728 } 2729 2730 static int __kmp_test_hle_lock(kmp_dyna_lock_t *lck, kmp_int32 gtid) { 2731 return swap4(lck, KMP_LOCK_BUSY(1, hle)) == KMP_LOCK_FREE(hle); 2732 } 2733 2734 static int __kmp_test_hle_lock_with_checks(kmp_dyna_lock_t *lck, 2735 kmp_int32 gtid) { 2736 return __kmp_test_hle_lock(lck, gtid); // TODO: add checks 2737 } 2738 2739 static void __kmp_init_rtm_queuing_lock(kmp_queuing_lock_t *lck) { 2740 __kmp_init_queuing_lock(lck); 2741 } 2742 2743 static void __kmp_destroy_rtm_queuing_lock(kmp_queuing_lock_t *lck) { 2744 __kmp_destroy_queuing_lock(lck); 2745 } 2746 2747 static void 2748 __kmp_destroy_rtm_queuing_lock_with_checks(kmp_queuing_lock_t *lck) { 2749 __kmp_destroy_queuing_lock_with_checks(lck); 2750 } 2751 2752 KMP_ATTRIBUTE_TARGET_RTM 2753 static void __kmp_acquire_rtm_queuing_lock(kmp_queuing_lock_t *lck, 2754 kmp_int32 gtid) { 2755 unsigned retries = 3, status; 2756 do { 2757 status = _xbegin(); 2758 if (status == _XBEGIN_STARTED) { 2759 if (__kmp_is_unlocked_queuing_lock(lck)) 2760 return; 2761 _xabort(0xff); 2762 } 2763 if ((status & _XABORT_EXPLICIT) && _XABORT_CODE(status) == 0xff) { 2764 // Wait until lock becomes free 2765 while (!__kmp_is_unlocked_queuing_lock(lck)) { 2766 KMP_YIELD(TRUE); 2767 } 2768 } else if (!(status & _XABORT_RETRY)) 2769 break; 2770 } while (retries--); 2771 2772 // Fall-back non-speculative lock (xchg) 2773 __kmp_acquire_queuing_lock(lck, gtid); 2774 } 2775 2776 static void __kmp_acquire_rtm_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 2777 kmp_int32 gtid) { 2778 __kmp_acquire_rtm_queuing_lock(lck, gtid); 2779 } 2780 2781 KMP_ATTRIBUTE_TARGET_RTM 2782 static int __kmp_release_rtm_queuing_lock(kmp_queuing_lock_t *lck, 2783 kmp_int32 gtid) { 2784 if (__kmp_is_unlocked_queuing_lock(lck)) { 2785 // Releasing from speculation 2786 _xend(); 2787 } else { 2788 // Releasing from a real lock 2789 __kmp_release_queuing_lock(lck, gtid); 2790 } 2791 return KMP_LOCK_RELEASED; 2792 } 2793 2794 static int __kmp_release_rtm_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 2795 kmp_int32 gtid) { 2796 return __kmp_release_rtm_queuing_lock(lck, gtid); 2797 } 2798 2799 KMP_ATTRIBUTE_TARGET_RTM 2800 static int __kmp_test_rtm_queuing_lock(kmp_queuing_lock_t *lck, 2801 kmp_int32 gtid) { 2802 unsigned retries = 3, status; 2803 do { 2804 status = _xbegin(); 2805 if (status == _XBEGIN_STARTED && __kmp_is_unlocked_queuing_lock(lck)) { 2806 return 1; 2807 } 2808 if (!(status & _XABORT_RETRY)) 2809 break; 2810 } while (retries--); 2811 2812 return __kmp_test_queuing_lock(lck, gtid); 2813 } 2814 2815 static int __kmp_test_rtm_queuing_lock_with_checks(kmp_queuing_lock_t *lck, 2816 kmp_int32 gtid) { 2817 return __kmp_test_rtm_queuing_lock(lck, gtid); 2818 } 2819 2820 // Reuse kmp_tas_lock_t for TSX lock which use RTM with fall-back spin lock. 2821 typedef kmp_tas_lock_t kmp_rtm_spin_lock_t; 2822 2823 static void __kmp_destroy_rtm_spin_lock(kmp_rtm_spin_lock_t *lck) { 2824 KMP_ATOMIC_ST_REL(&lck->lk.poll, 0); 2825 } 2826 2827 static void __kmp_destroy_rtm_spin_lock_with_checks(kmp_rtm_spin_lock_t *lck) { 2828 __kmp_destroy_rtm_spin_lock(lck); 2829 } 2830 2831 KMP_ATTRIBUTE_TARGET_RTM 2832 static int __kmp_acquire_rtm_spin_lock(kmp_rtm_spin_lock_t *lck, 2833 kmp_int32 gtid) { 2834 unsigned retries = 3, status; 2835 kmp_int32 lock_free = KMP_LOCK_FREE(rtm_spin); 2836 kmp_int32 lock_busy = KMP_LOCK_BUSY(1, rtm_spin); 2837 do { 2838 status = _xbegin(); 2839 if (status == _XBEGIN_STARTED) { 2840 if (KMP_ATOMIC_LD_RLX(&lck->lk.poll) == lock_free) 2841 return KMP_LOCK_ACQUIRED_FIRST; 2842 _xabort(0xff); 2843 } 2844 if ((status & _XABORT_EXPLICIT) && _XABORT_CODE(status) == 0xff) { 2845 // Wait until lock becomes free 2846 while (KMP_ATOMIC_LD_RLX(&lck->lk.poll) != lock_free) { 2847 KMP_YIELD(TRUE); 2848 } 2849 } else if (!(status & _XABORT_RETRY)) 2850 break; 2851 } while (retries--); 2852 2853 // Fall-back spin lock 2854 KMP_FSYNC_PREPARE(lck); 2855 kmp_backoff_t backoff = __kmp_spin_backoff_params; 2856 while (KMP_ATOMIC_LD_RLX(&lck->lk.poll) != lock_free || 2857 !__kmp_atomic_compare_store_acq(&lck->lk.poll, lock_free, lock_busy)) { 2858 __kmp_spin_backoff(&backoff); 2859 } 2860 KMP_FSYNC_ACQUIRED(lck); 2861 return KMP_LOCK_ACQUIRED_FIRST; 2862 } 2863 2864 static int __kmp_acquire_rtm_spin_lock_with_checks(kmp_rtm_spin_lock_t *lck, 2865 kmp_int32 gtid) { 2866 return __kmp_acquire_rtm_spin_lock(lck, gtid); 2867 } 2868 2869 KMP_ATTRIBUTE_TARGET_RTM 2870 static int __kmp_release_rtm_spin_lock(kmp_rtm_spin_lock_t *lck, 2871 kmp_int32 gtid) { 2872 if (KMP_ATOMIC_LD_RLX(&lck->lk.poll) == KMP_LOCK_FREE(rtm_spin)) { 2873 // Releasing from speculation 2874 _xend(); 2875 } else { 2876 // Releasing from a real lock 2877 KMP_FSYNC_RELEASING(lck); 2878 KMP_ATOMIC_ST_REL(&lck->lk.poll, KMP_LOCK_FREE(rtm_spin)); 2879 } 2880 return KMP_LOCK_RELEASED; 2881 } 2882 2883 static int __kmp_release_rtm_spin_lock_with_checks(kmp_rtm_spin_lock_t *lck, 2884 kmp_int32 gtid) { 2885 return __kmp_release_rtm_spin_lock(lck, gtid); 2886 } 2887 2888 KMP_ATTRIBUTE_TARGET_RTM 2889 static int __kmp_test_rtm_spin_lock(kmp_rtm_spin_lock_t *lck, kmp_int32 gtid) { 2890 unsigned retries = 3, status; 2891 kmp_int32 lock_free = KMP_LOCK_FREE(rtm_spin); 2892 kmp_int32 lock_busy = KMP_LOCK_BUSY(1, rtm_spin); 2893 do { 2894 status = _xbegin(); 2895 if (status == _XBEGIN_STARTED && 2896 KMP_ATOMIC_LD_RLX(&lck->lk.poll) == lock_free) { 2897 return TRUE; 2898 } 2899 if (!(status & _XABORT_RETRY)) 2900 break; 2901 } while (retries--); 2902 2903 if (KMP_ATOMIC_LD_RLX(&lck->lk.poll) == lock_free && 2904 __kmp_atomic_compare_store_acq(&lck->lk.poll, lock_free, lock_busy)) { 2905 KMP_FSYNC_ACQUIRED(lck); 2906 return TRUE; 2907 } 2908 return FALSE; 2909 } 2910 2911 static int __kmp_test_rtm_spin_lock_with_checks(kmp_rtm_spin_lock_t *lck, 2912 kmp_int32 gtid) { 2913 return __kmp_test_rtm_spin_lock(lck, gtid); 2914 } 2915 2916 #endif // KMP_USE_TSX 2917 2918 // Entry functions for indirect locks (first element of direct lock jump tables) 2919 static void __kmp_init_indirect_lock(kmp_dyna_lock_t *l, 2920 kmp_dyna_lockseq_t tag); 2921 static void __kmp_destroy_indirect_lock(kmp_dyna_lock_t *lock); 2922 static int __kmp_set_indirect_lock(kmp_dyna_lock_t *lock, kmp_int32); 2923 static int __kmp_unset_indirect_lock(kmp_dyna_lock_t *lock, kmp_int32); 2924 static int __kmp_test_indirect_lock(kmp_dyna_lock_t *lock, kmp_int32); 2925 static int __kmp_set_indirect_lock_with_checks(kmp_dyna_lock_t *lock, 2926 kmp_int32); 2927 static int __kmp_unset_indirect_lock_with_checks(kmp_dyna_lock_t *lock, 2928 kmp_int32); 2929 static int __kmp_test_indirect_lock_with_checks(kmp_dyna_lock_t *lock, 2930 kmp_int32); 2931 2932 // Lock function definitions for the union parameter type 2933 #define KMP_FOREACH_LOCK_KIND(m, a) m(ticket, a) m(queuing, a) m(drdpa, a) 2934 2935 #define expand1(lk, op) \ 2936 static void __kmp_##op##_##lk##_##lock(kmp_user_lock_p lock) { \ 2937 __kmp_##op##_##lk##_##lock(&lock->lk); \ 2938 } 2939 #define expand2(lk, op) \ 2940 static int __kmp_##op##_##lk##_##lock(kmp_user_lock_p lock, \ 2941 kmp_int32 gtid) { \ 2942 return __kmp_##op##_##lk##_##lock(&lock->lk, gtid); \ 2943 } 2944 #define expand3(lk, op) \ 2945 static void __kmp_set_##lk##_##lock_flags(kmp_user_lock_p lock, \ 2946 kmp_lock_flags_t flags) { \ 2947 __kmp_set_##lk##_lock_flags(&lock->lk, flags); \ 2948 } 2949 #define expand4(lk, op) \ 2950 static void __kmp_set_##lk##_##lock_location(kmp_user_lock_p lock, \ 2951 const ident_t *loc) { \ 2952 __kmp_set_##lk##_lock_location(&lock->lk, loc); \ 2953 } 2954 2955 KMP_FOREACH_LOCK_KIND(expand1, init) 2956 KMP_FOREACH_LOCK_KIND(expand1, init_nested) 2957 KMP_FOREACH_LOCK_KIND(expand1, destroy) 2958 KMP_FOREACH_LOCK_KIND(expand1, destroy_nested) 2959 KMP_FOREACH_LOCK_KIND(expand2, acquire) 2960 KMP_FOREACH_LOCK_KIND(expand2, acquire_nested) 2961 KMP_FOREACH_LOCK_KIND(expand2, release) 2962 KMP_FOREACH_LOCK_KIND(expand2, release_nested) 2963 KMP_FOREACH_LOCK_KIND(expand2, test) 2964 KMP_FOREACH_LOCK_KIND(expand2, test_nested) 2965 KMP_FOREACH_LOCK_KIND(expand3, ) 2966 KMP_FOREACH_LOCK_KIND(expand4, ) 2967 2968 #undef expand1 2969 #undef expand2 2970 #undef expand3 2971 #undef expand4 2972 2973 // Jump tables for the indirect lock functions 2974 // Only fill in the odd entries, that avoids the need to shift out the low bit 2975 2976 // init functions 2977 #define expand(l, op) 0, __kmp_init_direct_lock, 2978 void (*__kmp_direct_init[])(kmp_dyna_lock_t *, kmp_dyna_lockseq_t) = { 2979 __kmp_init_indirect_lock, 0, KMP_FOREACH_D_LOCK(expand, init)}; 2980 #undef expand 2981 2982 // destroy functions 2983 #define expand(l, op) 0, (void (*)(kmp_dyna_lock_t *))__kmp_##op##_##l##_lock, 2984 static void (*direct_destroy[])(kmp_dyna_lock_t *) = { 2985 __kmp_destroy_indirect_lock, 0, KMP_FOREACH_D_LOCK(expand, destroy)}; 2986 #undef expand 2987 #define expand(l, op) \ 2988 0, (void (*)(kmp_dyna_lock_t *))__kmp_destroy_##l##_lock_with_checks, 2989 static void (*direct_destroy_check[])(kmp_dyna_lock_t *) = { 2990 __kmp_destroy_indirect_lock, 0, KMP_FOREACH_D_LOCK(expand, destroy)}; 2991 #undef expand 2992 2993 // set/acquire functions 2994 #define expand(l, op) \ 2995 0, (int (*)(kmp_dyna_lock_t *, kmp_int32))__kmp_##op##_##l##_lock, 2996 static int (*direct_set[])(kmp_dyna_lock_t *, kmp_int32) = { 2997 __kmp_set_indirect_lock, 0, KMP_FOREACH_D_LOCK(expand, acquire)}; 2998 #undef expand 2999 #define expand(l, op) \ 3000 0, (int (*)(kmp_dyna_lock_t *, kmp_int32))__kmp_##op##_##l##_lock_with_checks, 3001 static int (*direct_set_check[])(kmp_dyna_lock_t *, kmp_int32) = { 3002 __kmp_set_indirect_lock_with_checks, 0, 3003 KMP_FOREACH_D_LOCK(expand, acquire)}; 3004 #undef expand 3005 3006 // unset/release and test functions 3007 #define expand(l, op) \ 3008 0, (int (*)(kmp_dyna_lock_t *, kmp_int32))__kmp_##op##_##l##_lock, 3009 static int (*direct_unset[])(kmp_dyna_lock_t *, kmp_int32) = { 3010 __kmp_unset_indirect_lock, 0, KMP_FOREACH_D_LOCK(expand, release)}; 3011 static int (*direct_test[])(kmp_dyna_lock_t *, kmp_int32) = { 3012 __kmp_test_indirect_lock, 0, KMP_FOREACH_D_LOCK(expand, test)}; 3013 #undef expand 3014 #define expand(l, op) \ 3015 0, (int (*)(kmp_dyna_lock_t *, kmp_int32))__kmp_##op##_##l##_lock_with_checks, 3016 static int (*direct_unset_check[])(kmp_dyna_lock_t *, kmp_int32) = { 3017 __kmp_unset_indirect_lock_with_checks, 0, 3018 KMP_FOREACH_D_LOCK(expand, release)}; 3019 static int (*direct_test_check[])(kmp_dyna_lock_t *, kmp_int32) = { 3020 __kmp_test_indirect_lock_with_checks, 0, KMP_FOREACH_D_LOCK(expand, test)}; 3021 #undef expand 3022 3023 // Exposes only one set of jump tables (*lock or *lock_with_checks). 3024 void (**__kmp_direct_destroy)(kmp_dyna_lock_t *) = 0; 3025 int (**__kmp_direct_set)(kmp_dyna_lock_t *, kmp_int32) = 0; 3026 int (**__kmp_direct_unset)(kmp_dyna_lock_t *, kmp_int32) = 0; 3027 int (**__kmp_direct_test)(kmp_dyna_lock_t *, kmp_int32) = 0; 3028 3029 // Jump tables for the indirect lock functions 3030 #define expand(l, op) (void (*)(kmp_user_lock_p)) __kmp_##op##_##l##_##lock, 3031 void (*__kmp_indirect_init[])(kmp_user_lock_p) = { 3032 KMP_FOREACH_I_LOCK(expand, init)}; 3033 #undef expand 3034 3035 #define expand(l, op) (void (*)(kmp_user_lock_p)) __kmp_##op##_##l##_##lock, 3036 static void (*indirect_destroy[])(kmp_user_lock_p) = { 3037 KMP_FOREACH_I_LOCK(expand, destroy)}; 3038 #undef expand 3039 #define expand(l, op) \ 3040 (void (*)(kmp_user_lock_p)) __kmp_##op##_##l##_##lock_with_checks, 3041 static void (*indirect_destroy_check[])(kmp_user_lock_p) = { 3042 KMP_FOREACH_I_LOCK(expand, destroy)}; 3043 #undef expand 3044 3045 // set/acquire functions 3046 #define expand(l, op) \ 3047 (int (*)(kmp_user_lock_p, kmp_int32)) __kmp_##op##_##l##_##lock, 3048 static int (*indirect_set[])(kmp_user_lock_p, 3049 kmp_int32) = {KMP_FOREACH_I_LOCK(expand, acquire)}; 3050 #undef expand 3051 #define expand(l, op) \ 3052 (int (*)(kmp_user_lock_p, kmp_int32)) __kmp_##op##_##l##_##lock_with_checks, 3053 static int (*indirect_set_check[])(kmp_user_lock_p, kmp_int32) = { 3054 KMP_FOREACH_I_LOCK(expand, acquire)}; 3055 #undef expand 3056 3057 // unset/release and test functions 3058 #define expand(l, op) \ 3059 (int (*)(kmp_user_lock_p, kmp_int32)) __kmp_##op##_##l##_##lock, 3060 static int (*indirect_unset[])(kmp_user_lock_p, kmp_int32) = { 3061 KMP_FOREACH_I_LOCK(expand, release)}; 3062 static int (*indirect_test[])(kmp_user_lock_p, 3063 kmp_int32) = {KMP_FOREACH_I_LOCK(expand, test)}; 3064 #undef expand 3065 #define expand(l, op) \ 3066 (int (*)(kmp_user_lock_p, kmp_int32)) __kmp_##op##_##l##_##lock_with_checks, 3067 static int (*indirect_unset_check[])(kmp_user_lock_p, kmp_int32) = { 3068 KMP_FOREACH_I_LOCK(expand, release)}; 3069 static int (*indirect_test_check[])(kmp_user_lock_p, kmp_int32) = { 3070 KMP_FOREACH_I_LOCK(expand, test)}; 3071 #undef expand 3072 3073 // Exposes only one jump tables (*lock or *lock_with_checks). 3074 void (**__kmp_indirect_destroy)(kmp_user_lock_p) = 0; 3075 int (**__kmp_indirect_set)(kmp_user_lock_p, kmp_int32) = 0; 3076 int (**__kmp_indirect_unset)(kmp_user_lock_p, kmp_int32) = 0; 3077 int (**__kmp_indirect_test)(kmp_user_lock_p, kmp_int32) = 0; 3078 3079 // Lock index table. 3080 kmp_indirect_lock_table_t __kmp_i_lock_table; 3081 3082 // Size of indirect locks. 3083 static kmp_uint32 __kmp_indirect_lock_size[KMP_NUM_I_LOCKS] = {0}; 3084 3085 // Jump tables for lock accessor/modifier. 3086 void (*__kmp_indirect_set_location[KMP_NUM_I_LOCKS])(kmp_user_lock_p, 3087 const ident_t *) = {0}; 3088 void (*__kmp_indirect_set_flags[KMP_NUM_I_LOCKS])(kmp_user_lock_p, 3089 kmp_lock_flags_t) = {0}; 3090 const ident_t *(*__kmp_indirect_get_location[KMP_NUM_I_LOCKS])( 3091 kmp_user_lock_p) = {0}; 3092 kmp_lock_flags_t (*__kmp_indirect_get_flags[KMP_NUM_I_LOCKS])( 3093 kmp_user_lock_p) = {0}; 3094 3095 // Use different lock pools for different lock types. 3096 static kmp_indirect_lock_t *__kmp_indirect_lock_pool[KMP_NUM_I_LOCKS] = {0}; 3097 3098 // User lock allocator for dynamically dispatched indirect locks. Every entry of 3099 // the indirect lock table holds the address and type of the allocated indirect 3100 // lock (kmp_indirect_lock_t), and the size of the table doubles when it is 3101 // full. A destroyed indirect lock object is returned to the reusable pool of 3102 // locks, unique to each lock type. 3103 kmp_indirect_lock_t *__kmp_allocate_indirect_lock(void **user_lock, 3104 kmp_int32 gtid, 3105 kmp_indirect_locktag_t tag) { 3106 kmp_indirect_lock_t *lck; 3107 kmp_lock_index_t idx; 3108 3109 __kmp_acquire_lock(&__kmp_global_lock, gtid); 3110 3111 if (__kmp_indirect_lock_pool[tag] != NULL) { 3112 // Reuse the allocated and destroyed lock object 3113 lck = __kmp_indirect_lock_pool[tag]; 3114 if (OMP_LOCK_T_SIZE < sizeof(void *)) 3115 idx = lck->lock->pool.index; 3116 __kmp_indirect_lock_pool[tag] = (kmp_indirect_lock_t *)lck->lock->pool.next; 3117 KA_TRACE(20, ("__kmp_allocate_indirect_lock: reusing an existing lock %p\n", 3118 lck)); 3119 } else { 3120 idx = __kmp_i_lock_table.next; 3121 // Check capacity and double the size if it is full 3122 if (idx == __kmp_i_lock_table.size) { 3123 // Double up the space for block pointers 3124 int row = __kmp_i_lock_table.size / KMP_I_LOCK_CHUNK; 3125 kmp_indirect_lock_t **new_table = (kmp_indirect_lock_t **)__kmp_allocate( 3126 2 * row * sizeof(kmp_indirect_lock_t *)); 3127 KMP_MEMCPY(new_table, __kmp_i_lock_table.table, 3128 row * sizeof(kmp_indirect_lock_t *)); 3129 kmp_indirect_lock_t **old_table = __kmp_i_lock_table.table; 3130 __kmp_i_lock_table.table = new_table; 3131 __kmp_free(old_table); 3132 // Allocate new objects in the new blocks 3133 for (int i = row; i < 2 * row; ++i) 3134 *(__kmp_i_lock_table.table + i) = (kmp_indirect_lock_t *)__kmp_allocate( 3135 KMP_I_LOCK_CHUNK * sizeof(kmp_indirect_lock_t)); 3136 __kmp_i_lock_table.size = 2 * idx; 3137 } 3138 __kmp_i_lock_table.next++; 3139 lck = KMP_GET_I_LOCK(idx); 3140 // Allocate a new base lock object 3141 lck->lock = (kmp_user_lock_p)__kmp_allocate(__kmp_indirect_lock_size[tag]); 3142 KA_TRACE(20, 3143 ("__kmp_allocate_indirect_lock: allocated a new lock %p\n", lck)); 3144 } 3145 3146 __kmp_release_lock(&__kmp_global_lock, gtid); 3147 3148 lck->type = tag; 3149 3150 if (OMP_LOCK_T_SIZE < sizeof(void *)) { 3151 *((kmp_lock_index_t *)user_lock) = idx 3152 << 1; // indirect lock word must be even 3153 } else { 3154 *((kmp_indirect_lock_t **)user_lock) = lck; 3155 } 3156 3157 return lck; 3158 } 3159 3160 // User lock lookup for dynamically dispatched locks. 3161 static __forceinline kmp_indirect_lock_t * 3162 __kmp_lookup_indirect_lock(void **user_lock, const char *func) { 3163 if (__kmp_env_consistency_check) { 3164 kmp_indirect_lock_t *lck = NULL; 3165 if (user_lock == NULL) { 3166 KMP_FATAL(LockIsUninitialized, func); 3167 } 3168 if (OMP_LOCK_T_SIZE < sizeof(void *)) { 3169 kmp_lock_index_t idx = KMP_EXTRACT_I_INDEX(user_lock); 3170 if (idx >= __kmp_i_lock_table.size) { 3171 KMP_FATAL(LockIsUninitialized, func); 3172 } 3173 lck = KMP_GET_I_LOCK(idx); 3174 } else { 3175 lck = *((kmp_indirect_lock_t **)user_lock); 3176 } 3177 if (lck == NULL) { 3178 KMP_FATAL(LockIsUninitialized, func); 3179 } 3180 return lck; 3181 } else { 3182 if (OMP_LOCK_T_SIZE < sizeof(void *)) { 3183 return KMP_GET_I_LOCK(KMP_EXTRACT_I_INDEX(user_lock)); 3184 } else { 3185 return *((kmp_indirect_lock_t **)user_lock); 3186 } 3187 } 3188 } 3189 3190 static void __kmp_init_indirect_lock(kmp_dyna_lock_t *lock, 3191 kmp_dyna_lockseq_t seq) { 3192 #if KMP_USE_ADAPTIVE_LOCKS 3193 if (seq == lockseq_adaptive && !__kmp_cpuinfo.rtm) { 3194 KMP_WARNING(AdaptiveNotSupported, "kmp_lockseq_t", "adaptive"); 3195 seq = lockseq_queuing; 3196 } 3197 #endif 3198 #if KMP_USE_TSX 3199 if (seq == lockseq_rtm_queuing && !__kmp_cpuinfo.rtm) { 3200 seq = lockseq_queuing; 3201 } 3202 #endif 3203 kmp_indirect_locktag_t tag = KMP_GET_I_TAG(seq); 3204 kmp_indirect_lock_t *l = 3205 __kmp_allocate_indirect_lock((void **)lock, __kmp_entry_gtid(), tag); 3206 KMP_I_LOCK_FUNC(l, init)(l->lock); 3207 KA_TRACE( 3208 20, ("__kmp_init_indirect_lock: initialized indirect lock with type#%d\n", 3209 seq)); 3210 } 3211 3212 static void __kmp_destroy_indirect_lock(kmp_dyna_lock_t *lock) { 3213 kmp_uint32 gtid = __kmp_entry_gtid(); 3214 kmp_indirect_lock_t *l = 3215 __kmp_lookup_indirect_lock((void **)lock, "omp_destroy_lock"); 3216 KMP_I_LOCK_FUNC(l, destroy)(l->lock); 3217 kmp_indirect_locktag_t tag = l->type; 3218 3219 __kmp_acquire_lock(&__kmp_global_lock, gtid); 3220 3221 // Use the base lock's space to keep the pool chain. 3222 l->lock->pool.next = (kmp_user_lock_p)__kmp_indirect_lock_pool[tag]; 3223 if (OMP_LOCK_T_SIZE < sizeof(void *)) { 3224 l->lock->pool.index = KMP_EXTRACT_I_INDEX(lock); 3225 } 3226 __kmp_indirect_lock_pool[tag] = l; 3227 3228 __kmp_release_lock(&__kmp_global_lock, gtid); 3229 } 3230 3231 static int __kmp_set_indirect_lock(kmp_dyna_lock_t *lock, kmp_int32 gtid) { 3232 kmp_indirect_lock_t *l = KMP_LOOKUP_I_LOCK(lock); 3233 return KMP_I_LOCK_FUNC(l, set)(l->lock, gtid); 3234 } 3235 3236 static int __kmp_unset_indirect_lock(kmp_dyna_lock_t *lock, kmp_int32 gtid) { 3237 kmp_indirect_lock_t *l = KMP_LOOKUP_I_LOCK(lock); 3238 return KMP_I_LOCK_FUNC(l, unset)(l->lock, gtid); 3239 } 3240 3241 static int __kmp_test_indirect_lock(kmp_dyna_lock_t *lock, kmp_int32 gtid) { 3242 kmp_indirect_lock_t *l = KMP_LOOKUP_I_LOCK(lock); 3243 return KMP_I_LOCK_FUNC(l, test)(l->lock, gtid); 3244 } 3245 3246 static int __kmp_set_indirect_lock_with_checks(kmp_dyna_lock_t *lock, 3247 kmp_int32 gtid) { 3248 kmp_indirect_lock_t *l = 3249 __kmp_lookup_indirect_lock((void **)lock, "omp_set_lock"); 3250 return KMP_I_LOCK_FUNC(l, set)(l->lock, gtid); 3251 } 3252 3253 static int __kmp_unset_indirect_lock_with_checks(kmp_dyna_lock_t *lock, 3254 kmp_int32 gtid) { 3255 kmp_indirect_lock_t *l = 3256 __kmp_lookup_indirect_lock((void **)lock, "omp_unset_lock"); 3257 return KMP_I_LOCK_FUNC(l, unset)(l->lock, gtid); 3258 } 3259 3260 static int __kmp_test_indirect_lock_with_checks(kmp_dyna_lock_t *lock, 3261 kmp_int32 gtid) { 3262 kmp_indirect_lock_t *l = 3263 __kmp_lookup_indirect_lock((void **)lock, "omp_test_lock"); 3264 return KMP_I_LOCK_FUNC(l, test)(l->lock, gtid); 3265 } 3266 3267 kmp_dyna_lockseq_t __kmp_user_lock_seq = lockseq_queuing; 3268 3269 // This is used only in kmp_error.cpp when consistency checking is on. 3270 kmp_int32 __kmp_get_user_lock_owner(kmp_user_lock_p lck, kmp_uint32 seq) { 3271 switch (seq) { 3272 case lockseq_tas: 3273 case lockseq_nested_tas: 3274 return __kmp_get_tas_lock_owner((kmp_tas_lock_t *)lck); 3275 #if KMP_USE_FUTEX 3276 case lockseq_futex: 3277 case lockseq_nested_futex: 3278 return __kmp_get_futex_lock_owner((kmp_futex_lock_t *)lck); 3279 #endif 3280 case lockseq_ticket: 3281 case lockseq_nested_ticket: 3282 return __kmp_get_ticket_lock_owner((kmp_ticket_lock_t *)lck); 3283 case lockseq_queuing: 3284 case lockseq_nested_queuing: 3285 #if KMP_USE_ADAPTIVE_LOCKS 3286 case lockseq_adaptive: 3287 #endif 3288 return __kmp_get_queuing_lock_owner((kmp_queuing_lock_t *)lck); 3289 case lockseq_drdpa: 3290 case lockseq_nested_drdpa: 3291 return __kmp_get_drdpa_lock_owner((kmp_drdpa_lock_t *)lck); 3292 default: 3293 return 0; 3294 } 3295 } 3296 3297 // Initializes data for dynamic user locks. 3298 void __kmp_init_dynamic_user_locks() { 3299 // Initialize jump table for the lock functions 3300 if (__kmp_env_consistency_check) { 3301 __kmp_direct_set = direct_set_check; 3302 __kmp_direct_unset = direct_unset_check; 3303 __kmp_direct_test = direct_test_check; 3304 __kmp_direct_destroy = direct_destroy_check; 3305 __kmp_indirect_set = indirect_set_check; 3306 __kmp_indirect_unset = indirect_unset_check; 3307 __kmp_indirect_test = indirect_test_check; 3308 __kmp_indirect_destroy = indirect_destroy_check; 3309 } else { 3310 __kmp_direct_set = direct_set; 3311 __kmp_direct_unset = direct_unset; 3312 __kmp_direct_test = direct_test; 3313 __kmp_direct_destroy = direct_destroy; 3314 __kmp_indirect_set = indirect_set; 3315 __kmp_indirect_unset = indirect_unset; 3316 __kmp_indirect_test = indirect_test; 3317 __kmp_indirect_destroy = indirect_destroy; 3318 } 3319 // If the user locks have already been initialized, then return. Allow the 3320 // switch between different KMP_CONSISTENCY_CHECK values, but do not allocate 3321 // new lock tables if they have already been allocated. 3322 if (__kmp_init_user_locks) 3323 return; 3324 3325 // Initialize lock index table 3326 __kmp_i_lock_table.size = KMP_I_LOCK_CHUNK; 3327 __kmp_i_lock_table.table = 3328 (kmp_indirect_lock_t **)__kmp_allocate(sizeof(kmp_indirect_lock_t *)); 3329 *(__kmp_i_lock_table.table) = (kmp_indirect_lock_t *)__kmp_allocate( 3330 KMP_I_LOCK_CHUNK * sizeof(kmp_indirect_lock_t)); 3331 __kmp_i_lock_table.next = 0; 3332 3333 // Indirect lock size 3334 __kmp_indirect_lock_size[locktag_ticket] = sizeof(kmp_ticket_lock_t); 3335 __kmp_indirect_lock_size[locktag_queuing] = sizeof(kmp_queuing_lock_t); 3336 #if KMP_USE_ADAPTIVE_LOCKS 3337 __kmp_indirect_lock_size[locktag_adaptive] = sizeof(kmp_adaptive_lock_t); 3338 #endif 3339 __kmp_indirect_lock_size[locktag_drdpa] = sizeof(kmp_drdpa_lock_t); 3340 #if KMP_USE_TSX 3341 __kmp_indirect_lock_size[locktag_rtm_queuing] = sizeof(kmp_queuing_lock_t); 3342 #endif 3343 __kmp_indirect_lock_size[locktag_nested_tas] = sizeof(kmp_tas_lock_t); 3344 #if KMP_USE_FUTEX 3345 __kmp_indirect_lock_size[locktag_nested_futex] = sizeof(kmp_futex_lock_t); 3346 #endif 3347 __kmp_indirect_lock_size[locktag_nested_ticket] = sizeof(kmp_ticket_lock_t); 3348 __kmp_indirect_lock_size[locktag_nested_queuing] = sizeof(kmp_queuing_lock_t); 3349 __kmp_indirect_lock_size[locktag_nested_drdpa] = sizeof(kmp_drdpa_lock_t); 3350 3351 // Initialize lock accessor/modifier 3352 #define fill_jumps(table, expand, sep) \ 3353 { \ 3354 table[locktag##sep##ticket] = expand(ticket); \ 3355 table[locktag##sep##queuing] = expand(queuing); \ 3356 table[locktag##sep##drdpa] = expand(drdpa); \ 3357 } 3358 3359 #if KMP_USE_ADAPTIVE_LOCKS 3360 #define fill_table(table, expand) \ 3361 { \ 3362 fill_jumps(table, expand, _); \ 3363 table[locktag_adaptive] = expand(queuing); \ 3364 fill_jumps(table, expand, _nested_); \ 3365 } 3366 #else 3367 #define fill_table(table, expand) \ 3368 { \ 3369 fill_jumps(table, expand, _); \ 3370 fill_jumps(table, expand, _nested_); \ 3371 } 3372 #endif // KMP_USE_ADAPTIVE_LOCKS 3373 3374 #define expand(l) \ 3375 (void (*)(kmp_user_lock_p, const ident_t *)) __kmp_set_##l##_lock_location 3376 fill_table(__kmp_indirect_set_location, expand); 3377 #undef expand 3378 #define expand(l) \ 3379 (void (*)(kmp_user_lock_p, kmp_lock_flags_t)) __kmp_set_##l##_lock_flags 3380 fill_table(__kmp_indirect_set_flags, expand); 3381 #undef expand 3382 #define expand(l) \ 3383 (const ident_t *(*)(kmp_user_lock_p)) __kmp_get_##l##_lock_location 3384 fill_table(__kmp_indirect_get_location, expand); 3385 #undef expand 3386 #define expand(l) \ 3387 (kmp_lock_flags_t(*)(kmp_user_lock_p)) __kmp_get_##l##_lock_flags 3388 fill_table(__kmp_indirect_get_flags, expand); 3389 #undef expand 3390 3391 __kmp_init_user_locks = TRUE; 3392 } 3393 3394 // Clean up the lock table. 3395 void __kmp_cleanup_indirect_user_locks() { 3396 kmp_lock_index_t i; 3397 int k; 3398 3399 // Clean up locks in the pools first (they were already destroyed before going 3400 // into the pools). 3401 for (k = 0; k < KMP_NUM_I_LOCKS; ++k) { 3402 kmp_indirect_lock_t *l = __kmp_indirect_lock_pool[k]; 3403 while (l != NULL) { 3404 kmp_indirect_lock_t *ll = l; 3405 l = (kmp_indirect_lock_t *)l->lock->pool.next; 3406 KA_TRACE(20, ("__kmp_cleanup_indirect_user_locks: freeing %p from pool\n", 3407 ll)); 3408 __kmp_free(ll->lock); 3409 ll->lock = NULL; 3410 } 3411 __kmp_indirect_lock_pool[k] = NULL; 3412 } 3413 // Clean up the remaining undestroyed locks. 3414 for (i = 0; i < __kmp_i_lock_table.next; i++) { 3415 kmp_indirect_lock_t *l = KMP_GET_I_LOCK(i); 3416 if (l->lock != NULL) { 3417 // Locks not destroyed explicitly need to be destroyed here. 3418 KMP_I_LOCK_FUNC(l, destroy)(l->lock); 3419 KA_TRACE( 3420 20, 3421 ("__kmp_cleanup_indirect_user_locks: destroy/freeing %p from table\n", 3422 l)); 3423 __kmp_free(l->lock); 3424 } 3425 } 3426 // Free the table 3427 for (i = 0; i < __kmp_i_lock_table.size / KMP_I_LOCK_CHUNK; i++) 3428 __kmp_free(__kmp_i_lock_table.table[i]); 3429 __kmp_free(__kmp_i_lock_table.table); 3430 3431 __kmp_init_user_locks = FALSE; 3432 } 3433 3434 enum kmp_lock_kind __kmp_user_lock_kind = lk_default; 3435 int __kmp_num_locks_in_block = 1; // FIXME - tune this value 3436 3437 #else // KMP_USE_DYNAMIC_LOCK 3438 3439 static void __kmp_init_tas_lock_with_checks(kmp_tas_lock_t *lck) { 3440 __kmp_init_tas_lock(lck); 3441 } 3442 3443 static void __kmp_init_nested_tas_lock_with_checks(kmp_tas_lock_t *lck) { 3444 __kmp_init_nested_tas_lock(lck); 3445 } 3446 3447 #if KMP_USE_FUTEX 3448 static void __kmp_init_futex_lock_with_checks(kmp_futex_lock_t *lck) { 3449 __kmp_init_futex_lock(lck); 3450 } 3451 3452 static void __kmp_init_nested_futex_lock_with_checks(kmp_futex_lock_t *lck) { 3453 __kmp_init_nested_futex_lock(lck); 3454 } 3455 #endif 3456 3457 static int __kmp_is_ticket_lock_initialized(kmp_ticket_lock_t *lck) { 3458 return lck == lck->lk.self; 3459 } 3460 3461 static void __kmp_init_ticket_lock_with_checks(kmp_ticket_lock_t *lck) { 3462 __kmp_init_ticket_lock(lck); 3463 } 3464 3465 static void __kmp_init_nested_ticket_lock_with_checks(kmp_ticket_lock_t *lck) { 3466 __kmp_init_nested_ticket_lock(lck); 3467 } 3468 3469 static int __kmp_is_queuing_lock_initialized(kmp_queuing_lock_t *lck) { 3470 return lck == lck->lk.initialized; 3471 } 3472 3473 static void __kmp_init_queuing_lock_with_checks(kmp_queuing_lock_t *lck) { 3474 __kmp_init_queuing_lock(lck); 3475 } 3476 3477 static void 3478 __kmp_init_nested_queuing_lock_with_checks(kmp_queuing_lock_t *lck) { 3479 __kmp_init_nested_queuing_lock(lck); 3480 } 3481 3482 #if KMP_USE_ADAPTIVE_LOCKS 3483 static void __kmp_init_adaptive_lock_with_checks(kmp_adaptive_lock_t *lck) { 3484 __kmp_init_adaptive_lock(lck); 3485 } 3486 #endif 3487 3488 static int __kmp_is_drdpa_lock_initialized(kmp_drdpa_lock_t *lck) { 3489 return lck == lck->lk.initialized; 3490 } 3491 3492 static void __kmp_init_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck) { 3493 __kmp_init_drdpa_lock(lck); 3494 } 3495 3496 static void __kmp_init_nested_drdpa_lock_with_checks(kmp_drdpa_lock_t *lck) { 3497 __kmp_init_nested_drdpa_lock(lck); 3498 } 3499 3500 /* user locks 3501 * They are implemented as a table of function pointers which are set to the 3502 * lock functions of the appropriate kind, once that has been determined. */ 3503 3504 enum kmp_lock_kind __kmp_user_lock_kind = lk_default; 3505 3506 size_t __kmp_base_user_lock_size = 0; 3507 size_t __kmp_user_lock_size = 0; 3508 3509 kmp_int32 (*__kmp_get_user_lock_owner_)(kmp_user_lock_p lck) = NULL; 3510 int (*__kmp_acquire_user_lock_with_checks_)(kmp_user_lock_p lck, 3511 kmp_int32 gtid) = NULL; 3512 3513 int (*__kmp_test_user_lock_with_checks_)(kmp_user_lock_p lck, 3514 kmp_int32 gtid) = NULL; 3515 int (*__kmp_release_user_lock_with_checks_)(kmp_user_lock_p lck, 3516 kmp_int32 gtid) = NULL; 3517 void (*__kmp_init_user_lock_with_checks_)(kmp_user_lock_p lck) = NULL; 3518 void (*__kmp_destroy_user_lock_)(kmp_user_lock_p lck) = NULL; 3519 void (*__kmp_destroy_user_lock_with_checks_)(kmp_user_lock_p lck) = NULL; 3520 int (*__kmp_acquire_nested_user_lock_with_checks_)(kmp_user_lock_p lck, 3521 kmp_int32 gtid) = NULL; 3522 3523 int (*__kmp_test_nested_user_lock_with_checks_)(kmp_user_lock_p lck, 3524 kmp_int32 gtid) = NULL; 3525 int (*__kmp_release_nested_user_lock_with_checks_)(kmp_user_lock_p lck, 3526 kmp_int32 gtid) = NULL; 3527 void (*__kmp_init_nested_user_lock_with_checks_)(kmp_user_lock_p lck) = NULL; 3528 void (*__kmp_destroy_nested_user_lock_with_checks_)(kmp_user_lock_p lck) = NULL; 3529 3530 int (*__kmp_is_user_lock_initialized_)(kmp_user_lock_p lck) = NULL; 3531 const ident_t *(*__kmp_get_user_lock_location_)(kmp_user_lock_p lck) = NULL; 3532 void (*__kmp_set_user_lock_location_)(kmp_user_lock_p lck, 3533 const ident_t *loc) = NULL; 3534 kmp_lock_flags_t (*__kmp_get_user_lock_flags_)(kmp_user_lock_p lck) = NULL; 3535 void (*__kmp_set_user_lock_flags_)(kmp_user_lock_p lck, 3536 kmp_lock_flags_t flags) = NULL; 3537 3538 void __kmp_set_user_lock_vptrs(kmp_lock_kind_t user_lock_kind) { 3539 switch (user_lock_kind) { 3540 case lk_default: 3541 default: 3542 KMP_ASSERT(0); 3543 3544 case lk_tas: { 3545 __kmp_base_user_lock_size = sizeof(kmp_base_tas_lock_t); 3546 __kmp_user_lock_size = sizeof(kmp_tas_lock_t); 3547 3548 __kmp_get_user_lock_owner_ = 3549 (kmp_int32(*)(kmp_user_lock_p))(&__kmp_get_tas_lock_owner); 3550 3551 if (__kmp_env_consistency_check) { 3552 KMP_BIND_USER_LOCK_WITH_CHECKS(tas); 3553 KMP_BIND_NESTED_USER_LOCK_WITH_CHECKS(tas); 3554 } else { 3555 KMP_BIND_USER_LOCK(tas); 3556 KMP_BIND_NESTED_USER_LOCK(tas); 3557 } 3558 3559 __kmp_destroy_user_lock_ = 3560 (void (*)(kmp_user_lock_p))(&__kmp_destroy_tas_lock); 3561 3562 __kmp_is_user_lock_initialized_ = (int (*)(kmp_user_lock_p))NULL; 3563 3564 __kmp_get_user_lock_location_ = (const ident_t *(*)(kmp_user_lock_p))NULL; 3565 3566 __kmp_set_user_lock_location_ = 3567 (void (*)(kmp_user_lock_p, const ident_t *))NULL; 3568 3569 __kmp_get_user_lock_flags_ = (kmp_lock_flags_t(*)(kmp_user_lock_p))NULL; 3570 3571 __kmp_set_user_lock_flags_ = 3572 (void (*)(kmp_user_lock_p, kmp_lock_flags_t))NULL; 3573 } break; 3574 3575 #if KMP_USE_FUTEX 3576 3577 case lk_futex: { 3578 __kmp_base_user_lock_size = sizeof(kmp_base_futex_lock_t); 3579 __kmp_user_lock_size = sizeof(kmp_futex_lock_t); 3580 3581 __kmp_get_user_lock_owner_ = 3582 (kmp_int32(*)(kmp_user_lock_p))(&__kmp_get_futex_lock_owner); 3583 3584 if (__kmp_env_consistency_check) { 3585 KMP_BIND_USER_LOCK_WITH_CHECKS(futex); 3586 KMP_BIND_NESTED_USER_LOCK_WITH_CHECKS(futex); 3587 } else { 3588 KMP_BIND_USER_LOCK(futex); 3589 KMP_BIND_NESTED_USER_LOCK(futex); 3590 } 3591 3592 __kmp_destroy_user_lock_ = 3593 (void (*)(kmp_user_lock_p))(&__kmp_destroy_futex_lock); 3594 3595 __kmp_is_user_lock_initialized_ = (int (*)(kmp_user_lock_p))NULL; 3596 3597 __kmp_get_user_lock_location_ = (const ident_t *(*)(kmp_user_lock_p))NULL; 3598 3599 __kmp_set_user_lock_location_ = 3600 (void (*)(kmp_user_lock_p, const ident_t *))NULL; 3601 3602 __kmp_get_user_lock_flags_ = (kmp_lock_flags_t(*)(kmp_user_lock_p))NULL; 3603 3604 __kmp_set_user_lock_flags_ = 3605 (void (*)(kmp_user_lock_p, kmp_lock_flags_t))NULL; 3606 } break; 3607 3608 #endif // KMP_USE_FUTEX 3609 3610 case lk_ticket: { 3611 __kmp_base_user_lock_size = sizeof(kmp_base_ticket_lock_t); 3612 __kmp_user_lock_size = sizeof(kmp_ticket_lock_t); 3613 3614 __kmp_get_user_lock_owner_ = 3615 (kmp_int32(*)(kmp_user_lock_p))(&__kmp_get_ticket_lock_owner); 3616 3617 if (__kmp_env_consistency_check) { 3618 KMP_BIND_USER_LOCK_WITH_CHECKS(ticket); 3619 KMP_BIND_NESTED_USER_LOCK_WITH_CHECKS(ticket); 3620 } else { 3621 KMP_BIND_USER_LOCK(ticket); 3622 KMP_BIND_NESTED_USER_LOCK(ticket); 3623 } 3624 3625 __kmp_destroy_user_lock_ = 3626 (void (*)(kmp_user_lock_p))(&__kmp_destroy_ticket_lock); 3627 3628 __kmp_is_user_lock_initialized_ = 3629 (int (*)(kmp_user_lock_p))(&__kmp_is_ticket_lock_initialized); 3630 3631 __kmp_get_user_lock_location_ = 3632 (const ident_t *(*)(kmp_user_lock_p))(&__kmp_get_ticket_lock_location); 3633 3634 __kmp_set_user_lock_location_ = (void (*)( 3635 kmp_user_lock_p, const ident_t *))(&__kmp_set_ticket_lock_location); 3636 3637 __kmp_get_user_lock_flags_ = 3638 (kmp_lock_flags_t(*)(kmp_user_lock_p))(&__kmp_get_ticket_lock_flags); 3639 3640 __kmp_set_user_lock_flags_ = (void (*)(kmp_user_lock_p, kmp_lock_flags_t))( 3641 &__kmp_set_ticket_lock_flags); 3642 } break; 3643 3644 case lk_queuing: { 3645 __kmp_base_user_lock_size = sizeof(kmp_base_queuing_lock_t); 3646 __kmp_user_lock_size = sizeof(kmp_queuing_lock_t); 3647 3648 __kmp_get_user_lock_owner_ = 3649 (kmp_int32(*)(kmp_user_lock_p))(&__kmp_get_queuing_lock_owner); 3650 3651 if (__kmp_env_consistency_check) { 3652 KMP_BIND_USER_LOCK_WITH_CHECKS(queuing); 3653 KMP_BIND_NESTED_USER_LOCK_WITH_CHECKS(queuing); 3654 } else { 3655 KMP_BIND_USER_LOCK(queuing); 3656 KMP_BIND_NESTED_USER_LOCK(queuing); 3657 } 3658 3659 __kmp_destroy_user_lock_ = 3660 (void (*)(kmp_user_lock_p))(&__kmp_destroy_queuing_lock); 3661 3662 __kmp_is_user_lock_initialized_ = 3663 (int (*)(kmp_user_lock_p))(&__kmp_is_queuing_lock_initialized); 3664 3665 __kmp_get_user_lock_location_ = 3666 (const ident_t *(*)(kmp_user_lock_p))(&__kmp_get_queuing_lock_location); 3667 3668 __kmp_set_user_lock_location_ = (void (*)( 3669 kmp_user_lock_p, const ident_t *))(&__kmp_set_queuing_lock_location); 3670 3671 __kmp_get_user_lock_flags_ = 3672 (kmp_lock_flags_t(*)(kmp_user_lock_p))(&__kmp_get_queuing_lock_flags); 3673 3674 __kmp_set_user_lock_flags_ = (void (*)(kmp_user_lock_p, kmp_lock_flags_t))( 3675 &__kmp_set_queuing_lock_flags); 3676 } break; 3677 3678 #if KMP_USE_ADAPTIVE_LOCKS 3679 case lk_adaptive: { 3680 __kmp_base_user_lock_size = sizeof(kmp_base_adaptive_lock_t); 3681 __kmp_user_lock_size = sizeof(kmp_adaptive_lock_t); 3682 3683 __kmp_get_user_lock_owner_ = 3684 (kmp_int32(*)(kmp_user_lock_p))(&__kmp_get_queuing_lock_owner); 3685 3686 if (__kmp_env_consistency_check) { 3687 KMP_BIND_USER_LOCK_WITH_CHECKS(adaptive); 3688 } else { 3689 KMP_BIND_USER_LOCK(adaptive); 3690 } 3691 3692 __kmp_destroy_user_lock_ = 3693 (void (*)(kmp_user_lock_p))(&__kmp_destroy_adaptive_lock); 3694 3695 __kmp_is_user_lock_initialized_ = 3696 (int (*)(kmp_user_lock_p))(&__kmp_is_queuing_lock_initialized); 3697 3698 __kmp_get_user_lock_location_ = 3699 (const ident_t *(*)(kmp_user_lock_p))(&__kmp_get_queuing_lock_location); 3700 3701 __kmp_set_user_lock_location_ = (void (*)( 3702 kmp_user_lock_p, const ident_t *))(&__kmp_set_queuing_lock_location); 3703 3704 __kmp_get_user_lock_flags_ = 3705 (kmp_lock_flags_t(*)(kmp_user_lock_p))(&__kmp_get_queuing_lock_flags); 3706 3707 __kmp_set_user_lock_flags_ = (void (*)(kmp_user_lock_p, kmp_lock_flags_t))( 3708 &__kmp_set_queuing_lock_flags); 3709 3710 } break; 3711 #endif // KMP_USE_ADAPTIVE_LOCKS 3712 3713 case lk_drdpa: { 3714 __kmp_base_user_lock_size = sizeof(kmp_base_drdpa_lock_t); 3715 __kmp_user_lock_size = sizeof(kmp_drdpa_lock_t); 3716 3717 __kmp_get_user_lock_owner_ = 3718 (kmp_int32(*)(kmp_user_lock_p))(&__kmp_get_drdpa_lock_owner); 3719 3720 if (__kmp_env_consistency_check) { 3721 KMP_BIND_USER_LOCK_WITH_CHECKS(drdpa); 3722 KMP_BIND_NESTED_USER_LOCK_WITH_CHECKS(drdpa); 3723 } else { 3724 KMP_BIND_USER_LOCK(drdpa); 3725 KMP_BIND_NESTED_USER_LOCK(drdpa); 3726 } 3727 3728 __kmp_destroy_user_lock_ = 3729 (void (*)(kmp_user_lock_p))(&__kmp_destroy_drdpa_lock); 3730 3731 __kmp_is_user_lock_initialized_ = 3732 (int (*)(kmp_user_lock_p))(&__kmp_is_drdpa_lock_initialized); 3733 3734 __kmp_get_user_lock_location_ = 3735 (const ident_t *(*)(kmp_user_lock_p))(&__kmp_get_drdpa_lock_location); 3736 3737 __kmp_set_user_lock_location_ = (void (*)( 3738 kmp_user_lock_p, const ident_t *))(&__kmp_set_drdpa_lock_location); 3739 3740 __kmp_get_user_lock_flags_ = 3741 (kmp_lock_flags_t(*)(kmp_user_lock_p))(&__kmp_get_drdpa_lock_flags); 3742 3743 __kmp_set_user_lock_flags_ = (void (*)(kmp_user_lock_p, kmp_lock_flags_t))( 3744 &__kmp_set_drdpa_lock_flags); 3745 } break; 3746 } 3747 } 3748 3749 // ---------------------------------------------------------------------------- 3750 // User lock table & lock allocation 3751 3752 kmp_lock_table_t __kmp_user_lock_table = {1, 0, NULL}; 3753 kmp_user_lock_p __kmp_lock_pool = NULL; 3754 3755 // Lock block-allocation support. 3756 kmp_block_of_locks *__kmp_lock_blocks = NULL; 3757 int __kmp_num_locks_in_block = 1; // FIXME - tune this value 3758 3759 static kmp_lock_index_t __kmp_lock_table_insert(kmp_user_lock_p lck) { 3760 // Assume that kmp_global_lock is held upon entry/exit. 3761 kmp_lock_index_t index; 3762 if (__kmp_user_lock_table.used >= __kmp_user_lock_table.allocated) { 3763 kmp_lock_index_t size; 3764 kmp_user_lock_p *table; 3765 // Reallocate lock table. 3766 if (__kmp_user_lock_table.allocated == 0) { 3767 size = 1024; 3768 } else { 3769 size = __kmp_user_lock_table.allocated * 2; 3770 } 3771 table = (kmp_user_lock_p *)__kmp_allocate(sizeof(kmp_user_lock_p) * size); 3772 KMP_MEMCPY(table + 1, __kmp_user_lock_table.table + 1, 3773 sizeof(kmp_user_lock_p) * (__kmp_user_lock_table.used - 1)); 3774 table[0] = (kmp_user_lock_p)__kmp_user_lock_table.table; 3775 // We cannot free the previous table now, since it may be in use by other 3776 // threads. So save the pointer to the previous table in in the first 3777 // element of the new table. All the tables will be organized into a list, 3778 // and could be freed when library shutting down. 3779 __kmp_user_lock_table.table = table; 3780 __kmp_user_lock_table.allocated = size; 3781 } 3782 KMP_DEBUG_ASSERT(__kmp_user_lock_table.used < 3783 __kmp_user_lock_table.allocated); 3784 index = __kmp_user_lock_table.used; 3785 __kmp_user_lock_table.table[index] = lck; 3786 ++__kmp_user_lock_table.used; 3787 return index; 3788 } 3789 3790 static kmp_user_lock_p __kmp_lock_block_allocate() { 3791 // Assume that kmp_global_lock is held upon entry/exit. 3792 static int last_index = 0; 3793 if ((last_index >= __kmp_num_locks_in_block) || (__kmp_lock_blocks == NULL)) { 3794 // Restart the index. 3795 last_index = 0; 3796 // Need to allocate a new block. 3797 KMP_DEBUG_ASSERT(__kmp_user_lock_size > 0); 3798 size_t space_for_locks = __kmp_user_lock_size * __kmp_num_locks_in_block; 3799 char *buffer = 3800 (char *)__kmp_allocate(space_for_locks + sizeof(kmp_block_of_locks)); 3801 // Set up the new block. 3802 kmp_block_of_locks *new_block = 3803 (kmp_block_of_locks *)(&buffer[space_for_locks]); 3804 new_block->next_block = __kmp_lock_blocks; 3805 new_block->locks = (void *)buffer; 3806 // Publish the new block. 3807 KMP_MB(); 3808 __kmp_lock_blocks = new_block; 3809 } 3810 kmp_user_lock_p ret = (kmp_user_lock_p)(&( 3811 ((char *)(__kmp_lock_blocks->locks))[last_index * __kmp_user_lock_size])); 3812 last_index++; 3813 return ret; 3814 } 3815 3816 // Get memory for a lock. It may be freshly allocated memory or reused memory 3817 // from lock pool. 3818 kmp_user_lock_p __kmp_user_lock_allocate(void **user_lock, kmp_int32 gtid, 3819 kmp_lock_flags_t flags) { 3820 kmp_user_lock_p lck; 3821 kmp_lock_index_t index; 3822 KMP_DEBUG_ASSERT(user_lock); 3823 3824 __kmp_acquire_lock(&__kmp_global_lock, gtid); 3825 3826 if (__kmp_lock_pool == NULL) { 3827 // Lock pool is empty. Allocate new memory. 3828 3829 if (__kmp_num_locks_in_block <= 1) { // Tune this cutoff point. 3830 lck = (kmp_user_lock_p)__kmp_allocate(__kmp_user_lock_size); 3831 } else { 3832 lck = __kmp_lock_block_allocate(); 3833 } 3834 3835 // Insert lock in the table so that it can be freed in __kmp_cleanup, 3836 // and debugger has info on all allocated locks. 3837 index = __kmp_lock_table_insert(lck); 3838 } else { 3839 // Pick up lock from pool. 3840 lck = __kmp_lock_pool; 3841 index = __kmp_lock_pool->pool.index; 3842 __kmp_lock_pool = __kmp_lock_pool->pool.next; 3843 } 3844 3845 // We could potentially differentiate between nested and regular locks 3846 // here, and do the lock table lookup for regular locks only. 3847 if (OMP_LOCK_T_SIZE < sizeof(void *)) { 3848 *((kmp_lock_index_t *)user_lock) = index; 3849 } else { 3850 *((kmp_user_lock_p *)user_lock) = lck; 3851 } 3852 3853 // mark the lock if it is critical section lock. 3854 __kmp_set_user_lock_flags(lck, flags); 3855 3856 __kmp_release_lock(&__kmp_global_lock, gtid); // AC: TODO move this line upper 3857 3858 return lck; 3859 } 3860 3861 // Put lock's memory to pool for reusing. 3862 void __kmp_user_lock_free(void **user_lock, kmp_int32 gtid, 3863 kmp_user_lock_p lck) { 3864 KMP_DEBUG_ASSERT(user_lock != NULL); 3865 KMP_DEBUG_ASSERT(lck != NULL); 3866 3867 __kmp_acquire_lock(&__kmp_global_lock, gtid); 3868 3869 lck->pool.next = __kmp_lock_pool; 3870 __kmp_lock_pool = lck; 3871 if (OMP_LOCK_T_SIZE < sizeof(void *)) { 3872 kmp_lock_index_t index = *((kmp_lock_index_t *)user_lock); 3873 KMP_DEBUG_ASSERT(0 < index && index <= __kmp_user_lock_table.used); 3874 lck->pool.index = index; 3875 } 3876 3877 __kmp_release_lock(&__kmp_global_lock, gtid); 3878 } 3879 3880 kmp_user_lock_p __kmp_lookup_user_lock(void **user_lock, char const *func) { 3881 kmp_user_lock_p lck = NULL; 3882 3883 if (__kmp_env_consistency_check) { 3884 if (user_lock == NULL) { 3885 KMP_FATAL(LockIsUninitialized, func); 3886 } 3887 } 3888 3889 if (OMP_LOCK_T_SIZE < sizeof(void *)) { 3890 kmp_lock_index_t index = *((kmp_lock_index_t *)user_lock); 3891 if (__kmp_env_consistency_check) { 3892 if (!(0 < index && index < __kmp_user_lock_table.used)) { 3893 KMP_FATAL(LockIsUninitialized, func); 3894 } 3895 } 3896 KMP_DEBUG_ASSERT(0 < index && index < __kmp_user_lock_table.used); 3897 KMP_DEBUG_ASSERT(__kmp_user_lock_size > 0); 3898 lck = __kmp_user_lock_table.table[index]; 3899 } else { 3900 lck = *((kmp_user_lock_p *)user_lock); 3901 } 3902 3903 if (__kmp_env_consistency_check) { 3904 if (lck == NULL) { 3905 KMP_FATAL(LockIsUninitialized, func); 3906 } 3907 } 3908 3909 return lck; 3910 } 3911 3912 void __kmp_cleanup_user_locks(void) { 3913 // Reset lock pool. Don't worry about lock in the pool--we will free them when 3914 // iterating through lock table (it includes all the locks, dead or alive). 3915 __kmp_lock_pool = NULL; 3916 3917 #define IS_CRITICAL(lck) \ 3918 ((__kmp_get_user_lock_flags_ != NULL) && \ 3919 ((*__kmp_get_user_lock_flags_)(lck)&kmp_lf_critical_section)) 3920 3921 // Loop through lock table, free all locks. 3922 // Do not free item [0], it is reserved for lock tables list. 3923 // 3924 // FIXME - we are iterating through a list of (pointers to) objects of type 3925 // union kmp_user_lock, but we have no way of knowing whether the base type is 3926 // currently "pool" or whatever the global user lock type is. 3927 // 3928 // We are relying on the fact that for all of the user lock types 3929 // (except "tas"), the first field in the lock struct is the "initialized" 3930 // field, which is set to the address of the lock object itself when 3931 // the lock is initialized. When the union is of type "pool", the 3932 // first field is a pointer to the next object in the free list, which 3933 // will not be the same address as the object itself. 3934 // 3935 // This means that the check (*__kmp_is_user_lock_initialized_)(lck) will fail 3936 // for "pool" objects on the free list. This must happen as the "location" 3937 // field of real user locks overlaps the "index" field of "pool" objects. 3938 // 3939 // It would be better to run through the free list, and remove all "pool" 3940 // objects from the lock table before executing this loop. However, 3941 // "pool" objects do not always have their index field set (only on 3942 // lin_32e), and I don't want to search the lock table for the address 3943 // of every "pool" object on the free list. 3944 while (__kmp_user_lock_table.used > 1) { 3945 const ident *loc; 3946 3947 // reduce __kmp_user_lock_table.used before freeing the lock, 3948 // so that state of locks is consistent 3949 kmp_user_lock_p lck = 3950 __kmp_user_lock_table.table[--__kmp_user_lock_table.used]; 3951 3952 if ((__kmp_is_user_lock_initialized_ != NULL) && 3953 (*__kmp_is_user_lock_initialized_)(lck)) { 3954 // Issue a warning if: KMP_CONSISTENCY_CHECK AND lock is initialized AND 3955 // it is NOT a critical section (user is not responsible for destroying 3956 // criticals) AND we know source location to report. 3957 if (__kmp_env_consistency_check && (!IS_CRITICAL(lck)) && 3958 ((loc = __kmp_get_user_lock_location(lck)) != NULL) && 3959 (loc->psource != NULL)) { 3960 kmp_str_loc_t str_loc = __kmp_str_loc_init(loc->psource, false); 3961 KMP_WARNING(CnsLockNotDestroyed, str_loc.file, str_loc.line); 3962 __kmp_str_loc_free(&str_loc); 3963 } 3964 3965 #ifdef KMP_DEBUG 3966 if (IS_CRITICAL(lck)) { 3967 KA_TRACE( 3968 20, 3969 ("__kmp_cleanup_user_locks: free critical section lock %p (%p)\n", 3970 lck, *(void **)lck)); 3971 } else { 3972 KA_TRACE(20, ("__kmp_cleanup_user_locks: free lock %p (%p)\n", lck, 3973 *(void **)lck)); 3974 } 3975 #endif // KMP_DEBUG 3976 3977 // Cleanup internal lock dynamic resources (for drdpa locks particularly). 3978 __kmp_destroy_user_lock(lck); 3979 } 3980 3981 // Free the lock if block allocation of locks is not used. 3982 if (__kmp_lock_blocks == NULL) { 3983 __kmp_free(lck); 3984 } 3985 } 3986 3987 #undef IS_CRITICAL 3988 3989 // delete lock table(s). 3990 kmp_user_lock_p *table_ptr = __kmp_user_lock_table.table; 3991 __kmp_user_lock_table.table = NULL; 3992 __kmp_user_lock_table.allocated = 0; 3993 3994 while (table_ptr != NULL) { 3995 // In the first element we saved the pointer to the previous 3996 // (smaller) lock table. 3997 kmp_user_lock_p *next = (kmp_user_lock_p *)(table_ptr[0]); 3998 __kmp_free(table_ptr); 3999 table_ptr = next; 4000 } 4001 4002 // Free buffers allocated for blocks of locks. 4003 kmp_block_of_locks_t *block_ptr = __kmp_lock_blocks; 4004 __kmp_lock_blocks = NULL; 4005 4006 while (block_ptr != NULL) { 4007 kmp_block_of_locks_t *next = block_ptr->next_block; 4008 __kmp_free(block_ptr->locks); 4009 // *block_ptr itself was allocated at the end of the locks vector. 4010 block_ptr = next; 4011 } 4012 4013 TCW_4(__kmp_init_user_locks, FALSE); 4014 } 4015 4016 #endif // KMP_USE_DYNAMIC_LOCK 4017