/* * kmp_alloc.cpp -- private/shared dynamic memory allocation and management */ //===----------------------------------------------------------------------===// // // The LLVM Compiler Infrastructure // // This file is dual licensed under the MIT and the University of Illinois Open // Source Licenses. See LICENSE.txt for details. // //===----------------------------------------------------------------------===// #include "kmp.h" #include "kmp_wrapper_malloc.h" #include "kmp_io.h" // Disable bget when it is not used #if KMP_USE_BGET /* Thread private buffer management code */ typedef int (*bget_compact_t)(size_t, int); typedef void *(*bget_acquire_t)(size_t); typedef void (*bget_release_t)(void *); /* NOTE: bufsize must be a signed datatype */ #if KMP_OS_WINDOWS # if KMP_ARCH_X86 || KMP_ARCH_ARM typedef kmp_int32 bufsize; # else typedef kmp_int64 bufsize; # endif #else typedef ssize_t bufsize; #endif /* The three modes of operation are, fifo search, lifo search, and best-fit */ typedef enum bget_mode { bget_mode_fifo = 0, bget_mode_lifo = 1, bget_mode_best = 2 } bget_mode_t; static void bpool( kmp_info_t *th, void *buffer, bufsize len); static void *bget( kmp_info_t *th, bufsize size); static void *bgetz( kmp_info_t *th, bufsize size); static void *bgetr( kmp_info_t *th, void *buffer, bufsize newsize); static void brel( kmp_info_t *th, void *buf); static void bectl( kmp_info_t *th, bget_compact_t compact, bget_acquire_t acquire, bget_release_t release, bufsize pool_incr ); #ifdef KMP_DEBUG static void bstats( kmp_info_t *th, bufsize *curalloc, bufsize *totfree, bufsize *maxfree, long *nget, long *nrel); static void bstatse( kmp_info_t *th, bufsize *pool_incr, long *npool, long *npget, long *nprel, long *ndget, long *ndrel); static void bufdump( kmp_info_t *th, void *buf); static void bpoold( kmp_info_t *th, void *pool, int dumpalloc, int dumpfree); static int bpoolv( kmp_info_t *th, void *pool); #endif /* BGET CONFIGURATION */ /* Buffer allocation size quantum: all buffers allocated are a multiple of this size. This MUST be a power of two. */ /* On IA-32 architecture with Linux* OS, malloc() does not ensure 16 byte alignmnent */ #if KMP_ARCH_X86 || !KMP_HAVE_QUAD #define SizeQuant 8 #define AlignType double #else #define SizeQuant 16 #define AlignType _Quad #endif #define BufStats 1 /* Define this symbol to enable the bstats() function which calculates the total free space in the buffer pool, the largest available buffer, and the total space currently allocated. */ #ifdef KMP_DEBUG #define BufDump 1 /* Define this symbol to enable the bpoold() function which dumps the buffers in a buffer pool. */ #define BufValid 1 /* Define this symbol to enable the bpoolv() function for validating a buffer pool. */ #define DumpData 1 /* Define this symbol to enable the bufdump() function which allows dumping the contents of an allocated or free buffer. */ #ifdef NOT_USED_NOW #define FreeWipe 1 /* Wipe free buffers to a guaranteed pattern of garbage to trip up miscreants who attempt to use pointers into released buffers. */ #define BestFit 1 /* Use a best fit algorithm when searching for space for an allocation request. This uses memory more efficiently, but allocation will be much slower. */ #endif /* NOT_USED_NOW */ #endif /* KMP_DEBUG */ static bufsize bget_bin_size[ ] = { 0, // 1 << 6, /* .5 Cache line */ 1 << 7, /* 1 Cache line, new */ 1 << 8, /* 2 Cache lines */ 1 << 9, /* 4 Cache lines, new */ 1 << 10, /* 8 Cache lines */ 1 << 11, /* 16 Cache lines, new */ 1 << 12, 1 << 13, /* new */ 1 << 14, 1 << 15, /* new */ 1 << 16, 1 << 17, 1 << 18, 1 << 19, 1 << 20, /* 1MB */ 1 << 21, /* 2MB */ 1 << 22, /* 4MB */ 1 << 23, /* 8MB */ 1 << 24, /* 16MB */ 1 << 25, /* 32MB */ }; #define MAX_BGET_BINS (int)(sizeof(bget_bin_size) / sizeof(bufsize)) struct bfhead; /* Declare the interface, including the requested buffer size type, bufsize. */ /* Queue links */ typedef struct qlinks { struct bfhead *flink; /* Forward link */ struct bfhead *blink; /* Backward link */ } qlinks_t; /* Header in allocated and free buffers */ typedef struct bhead2 { kmp_info_t *bthr; /* The thread which owns the buffer pool */ bufsize prevfree; /* Relative link back to previous free buffer in memory or 0 if previous buffer is allocated. */ bufsize bsize; /* Buffer size: positive if free, negative if allocated. */ } bhead2_t; /* Make sure the bhead structure is a multiple of SizeQuant in size. */ typedef union bhead { KMP_ALIGN( SizeQuant ) AlignType b_align; char b_pad[ sizeof(bhead2_t) + (SizeQuant - (sizeof(bhead2_t) % SizeQuant)) ]; bhead2_t bb; } bhead_t; #define BH(p) ((bhead_t *) (p)) /* Header in directly allocated buffers (by acqfcn) */ typedef struct bdhead { bufsize tsize; /* Total size, including overhead */ bhead_t bh; /* Common header */ } bdhead_t; #define BDH(p) ((bdhead_t *) (p)) /* Header in free buffers */ typedef struct bfhead { bhead_t bh; /* Common allocated/free header */ qlinks_t ql; /* Links on free list */ } bfhead_t; #define BFH(p) ((bfhead_t *) (p)) typedef struct thr_data { bfhead_t freelist[ MAX_BGET_BINS ]; #if BufStats size_t totalloc; /* Total space currently allocated */ long numget, numrel; /* Number of bget() and brel() calls */ long numpblk; /* Number of pool blocks */ long numpget, numprel; /* Number of block gets and rels */ long numdget, numdrel; /* Number of direct gets and rels */ #endif /* BufStats */ /* Automatic expansion block management functions */ bget_compact_t compfcn; bget_acquire_t acqfcn; bget_release_t relfcn; bget_mode_t mode; /* what allocation mode to use? */ bufsize exp_incr; /* Expansion block size */ bufsize pool_len; /* 0: no bpool calls have been made -1: not all pool blocks are the same size >0: (common) block size for all bpool calls made so far */ bfhead_t * last_pool; /* Last pool owned by this thread (delay dealocation) */ } thr_data_t; /* Minimum allocation quantum: */ #define QLSize (sizeof(qlinks_t)) #define SizeQ ((SizeQuant > QLSize) ? SizeQuant : QLSize) #define MaxSize (bufsize)( ~ ( ( (bufsize)( 1 ) << ( sizeof( bufsize ) * CHAR_BIT - 1 ) ) | ( SizeQuant - 1 ) ) ) // Maximun for the requested size. /* End sentinel: value placed in bsize field of dummy block delimiting end of pool block. The most negative number which will fit in a bufsize, defined in a way that the compiler will accept. */ #define ESent ((bufsize) (-(((((bufsize)1)<<((int)sizeof(bufsize)*8-2))-1)*2)-2)) /* ------------------------------------------------------------------------ */ /* Thread Data management routines */ static int bget_get_bin( bufsize size ) { // binary chop bins int lo = 0, hi = MAX_BGET_BINS - 1; KMP_DEBUG_ASSERT( size > 0 ); while ( (hi - lo) > 1 ) { int mid = (lo + hi) >> 1; if (size < bget_bin_size[ mid ]) hi = mid - 1; else lo = mid; } KMP_DEBUG_ASSERT( (lo >= 0) && (lo < MAX_BGET_BINS) ); return lo; } static void set_thr_data( kmp_info_t *th ) { int i; thr_data_t *data; data = (thr_data_t *)( ( ! th->th.th_local.bget_data ) ? __kmp_allocate( sizeof( *data ) ) : th->th.th_local.bget_data ); memset( data, '\0', sizeof( *data ) ); for (i = 0; i < MAX_BGET_BINS; ++i) { data->freelist[ i ].ql.flink = & data->freelist[ i ]; data->freelist[ i ].ql.blink = & data->freelist[ i ]; } th->th.th_local.bget_data = data; th->th.th_local.bget_list = 0; #if ! USE_CMP_XCHG_FOR_BGET #ifdef USE_QUEUING_LOCK_FOR_BGET __kmp_init_lock( & th->th.th_local.bget_lock ); #else __kmp_init_bootstrap_lock( & th->th.th_local.bget_lock ); #endif /* USE_LOCK_FOR_BGET */ #endif /* ! USE_CMP_XCHG_FOR_BGET */ } static thr_data_t * get_thr_data( kmp_info_t *th ) { thr_data_t *data; data = (thr_data_t *) th->th.th_local.bget_data; KMP_DEBUG_ASSERT( data != 0 ); return data; } #ifdef KMP_DEBUG static void __kmp_bget_validate_queue( kmp_info_t *th ) { /* NOTE: assume that the global_lock is held */ void *p = (void *) th->th.th_local.bget_list; while (p != 0) { bfhead_t *b = BFH(((char *) p) - sizeof(bhead_t)); KMP_DEBUG_ASSERT(b->bh.bb.bsize != 0); p = (void *) b->ql.flink; } } #endif /* Walk the free list and release the enqueued buffers */ static void __kmp_bget_dequeue( kmp_info_t *th ) { void *p = TCR_SYNC_PTR(th->th.th_local.bget_list); if (p != 0) { #if USE_CMP_XCHG_FOR_BGET { volatile void *old_value = TCR_SYNC_PTR(th->th.th_local.bget_list); while ( ! KMP_COMPARE_AND_STORE_PTR( & th->th.th_local.bget_list, old_value, NULL ) ) { KMP_CPU_PAUSE(); old_value = TCR_SYNC_PTR(th->th.th_local.bget_list); } p = (void *) old_value; } #else /* ! USE_CMP_XCHG_FOR_BGET */ #ifdef USE_QUEUING_LOCK_FOR_BGET __kmp_acquire_lock( & th->th.th_local.bget_lock, __kmp_gtid_from_thread(th) ); #else __kmp_acquire_bootstrap_lock( & th->th.th_local.bget_lock ); #endif /* USE_QUEUING_LOCK_FOR_BGET */ p = (void *) th->th.th_local.bget_list; th->th.th_local.bget_list = 0; #ifdef USE_QUEUING_LOCK_FOR_BGET __kmp_release_lock( & th->th.th_local.bget_lock, __kmp_gtid_from_thread(th) ); #else __kmp_release_bootstrap_lock( & th->th.th_local.bget_lock ); #endif #endif /* USE_CMP_XCHG_FOR_BGET */ /* Check again to make sure the list is not empty */ while (p != 0) { void *buf = p; bfhead_t *b = BFH(((char *) p) - sizeof(bhead_t)); KMP_DEBUG_ASSERT( b->bh.bb.bsize != 0 ); KMP_DEBUG_ASSERT( ( (kmp_uintptr_t)TCR_PTR(b->bh.bb.bthr) & ~1 ) == (kmp_uintptr_t)th ); // clear possible mark KMP_DEBUG_ASSERT( b->ql.blink == 0 ); p = (void *) b->ql.flink; brel( th, buf ); } } } /* Chain together the free buffers by using the thread owner field */ static void __kmp_bget_enqueue( kmp_info_t *th, void *buf #ifdef USE_QUEUING_LOCK_FOR_BGET , kmp_int32 rel_gtid #endif ) { bfhead_t *b = BFH(((char *) buf) - sizeof(bhead_t)); KMP_DEBUG_ASSERT( b->bh.bb.bsize != 0 ); KMP_DEBUG_ASSERT( ( (kmp_uintptr_t)TCR_PTR(b->bh.bb.bthr) & ~1 ) == (kmp_uintptr_t)th ); // clear possible mark b->ql.blink = 0; KC_TRACE( 10, ( "__kmp_bget_enqueue: moving buffer to T#%d list\n", __kmp_gtid_from_thread( th ) ) ); #if USE_CMP_XCHG_FOR_BGET { volatile void *old_value = TCR_PTR(th->th.th_local.bget_list); /* the next pointer must be set before setting bget_list to buf to avoid exposing a broken list to other threads, even for an instant. */ b->ql.flink = BFH( old_value ); while ( ! KMP_COMPARE_AND_STORE_PTR( & th->th.th_local.bget_list, old_value, buf ) ) { KMP_CPU_PAUSE(); old_value = TCR_PTR(th->th.th_local.bget_list); /* the next pointer must be set before setting bget_list to buf to avoid exposing a broken list to other threads, even for an instant. */ b->ql.flink = BFH( old_value ); } } #else /* ! USE_CMP_XCHG_FOR_BGET */ # ifdef USE_QUEUING_LOCK_FOR_BGET __kmp_acquire_lock( & th->th.th_local.bget_lock, rel_gtid ); # else __kmp_acquire_bootstrap_lock( & th->th.th_local.bget_lock ); # endif b->ql.flink = BFH( th->th.th_local.bget_list ); th->th.th_local.bget_list = (void *) buf; # ifdef USE_QUEUING_LOCK_FOR_BGET __kmp_release_lock( & th->th.th_local.bget_lock, rel_gtid ); # else __kmp_release_bootstrap_lock( & th->th.th_local.bget_lock ); # endif #endif /* USE_CMP_XCHG_FOR_BGET */ } /* insert buffer back onto a new freelist */ static void __kmp_bget_insert_into_freelist( thr_data_t *thr, bfhead_t *b ) { int bin; KMP_DEBUG_ASSERT( ((size_t)b ) % SizeQuant == 0 ); KMP_DEBUG_ASSERT( b->bh.bb.bsize % SizeQuant == 0 ); bin = bget_get_bin( b->bh.bb.bsize ); KMP_DEBUG_ASSERT(thr->freelist[ bin ].ql.blink->ql.flink == &thr->freelist[ bin ]); KMP_DEBUG_ASSERT(thr->freelist[ bin ].ql.flink->ql.blink == &thr->freelist[ bin ]); b->ql.flink = &thr->freelist[ bin ]; b->ql.blink = thr->freelist[ bin ].ql.blink; thr->freelist[ bin ].ql.blink = b; b->ql.blink->ql.flink = b; } /* unlink the buffer from the old freelist */ static void __kmp_bget_remove_from_freelist( bfhead_t *b ) { KMP_DEBUG_ASSERT(b->ql.blink->ql.flink == b); KMP_DEBUG_ASSERT(b->ql.flink->ql.blink == b); b->ql.blink->ql.flink = b->ql.flink; b->ql.flink->ql.blink = b->ql.blink; } /* ------------------------------------------------------------------------ */ /* GET STATS -- check info on free list */ static void bcheck( kmp_info_t *th, bufsize *max_free, bufsize *total_free ) { thr_data_t *thr = get_thr_data( th ); int bin; *total_free = *max_free = 0; for (bin = 0; bin < MAX_BGET_BINS; ++bin) { bfhead_t *b, *best; best = &thr->freelist[ bin ]; b = best->ql.flink; while (b != &thr->freelist[ bin ]) { *total_free += (b->bh.bb.bsize - sizeof( bhead_t )); if ((best == &thr->freelist[ bin ]) || (b->bh.bb.bsize < best->bh.bb.bsize)) best = b; /* Link to next buffer */ b = b->ql.flink; } if (*max_free < best->bh.bb.bsize) *max_free = best->bh.bb.bsize; } if (*max_free > (bufsize)sizeof( bhead_t )) *max_free -= sizeof( bhead_t ); } /* ------------------------------------------------------------------------ */ /* BGET -- Allocate a buffer. */ static void * bget( kmp_info_t *th, bufsize requested_size ) { thr_data_t *thr = get_thr_data( th ); bufsize size = requested_size; bfhead_t *b; void *buf; int compactseq = 0; int use_blink = 0; /* For BestFit */ bfhead_t *best; if ( size < 0 || size + sizeof( bhead_t ) > MaxSize ) { return NULL; }; // if __kmp_bget_dequeue( th ); /* Release any queued buffers */ if (size < (bufsize)SizeQ) { /* Need at least room for the */ size = SizeQ; /* queue links. */ } #if defined( SizeQuant ) && ( SizeQuant > 1 ) size = (size + (SizeQuant - 1)) & (~(SizeQuant - 1)); #endif size += sizeof(bhead_t); /* Add overhead in allocated buffer to size required. */ KMP_DEBUG_ASSERT( size >= 0 ); KMP_DEBUG_ASSERT( size % SizeQuant == 0 ); use_blink = ( thr->mode == bget_mode_lifo ); /* If a compact function was provided in the call to bectl(), wrap a loop around the allocation process to allow compaction to intervene in case we don't find a suitable buffer in the chain. */ for (;;) { int bin; for (bin = bget_get_bin( size ); bin < MAX_BGET_BINS; ++bin) { /* Link to next buffer */ b = ( use_blink ? thr->freelist[ bin ].ql.blink : thr->freelist[ bin ].ql.flink ); if (thr->mode == bget_mode_best) { best = &thr->freelist[ bin ]; /* Scan the free list searching for the first buffer big enough to hold the requested size buffer. */ while (b != &thr->freelist[ bin ]) { if (b->bh.bb.bsize >= (bufsize) size) { if ((best == &thr->freelist[ bin ]) || (b->bh.bb.bsize < best->bh.bb.bsize)) { best = b; } } /* Link to next buffer */ b = ( use_blink ? b->ql.blink : b->ql.flink ); } b = best; } while (b != &thr->freelist[ bin ]) { if ((bufsize) b->bh.bb.bsize >= (bufsize) size) { /* Buffer is big enough to satisfy the request. Allocate it to the caller. We must decide whether the buffer is large enough to split into the part given to the caller and a free buffer that remains on the free list, or whether the entire buffer should be removed from the free list and given to the caller in its entirety. We only split the buffer if enough room remains for a header plus the minimum quantum of allocation. */ if ((b->bh.bb.bsize - (bufsize) size) > (bufsize)(SizeQ + (sizeof(bhead_t)))) { bhead_t *ba, *bn; ba = BH(((char *) b) + (b->bh.bb.bsize - (bufsize) size)); bn = BH(((char *) ba) + size); KMP_DEBUG_ASSERT(bn->bb.prevfree == b->bh.bb.bsize); /* Subtract size from length of free block. */ b->bh.bb.bsize -= (bufsize) size; /* Link allocated buffer to the previous free buffer. */ ba->bb.prevfree = b->bh.bb.bsize; /* Plug negative size into user buffer. */ ba->bb.bsize = -size; /* Mark this buffer as owned by this thread. */ TCW_PTR(ba->bb.bthr, th); // not an allocated address (do not mark it) /* Mark buffer after this one not preceded by free block. */ bn->bb.prevfree = 0; /* unlink the buffer from the old freelist, and reinsert it into the new freelist */ __kmp_bget_remove_from_freelist( b ); __kmp_bget_insert_into_freelist( thr, b ); #if BufStats thr->totalloc += (size_t) size; thr->numget++; /* Increment number of bget() calls */ #endif buf = (void *) ((((char *) ba) + sizeof(bhead_t))); KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 ); return buf; } else { bhead_t *ba; ba = BH(((char *) b) + b->bh.bb.bsize); KMP_DEBUG_ASSERT(ba->bb.prevfree == b->bh.bb.bsize); /* The buffer isn't big enough to split. Give the whole shebang to the caller and remove it from the free list. */ __kmp_bget_remove_from_freelist( b ); #if BufStats thr->totalloc += (size_t) b->bh.bb.bsize; thr->numget++; /* Increment number of bget() calls */ #endif /* Negate size to mark buffer allocated. */ b->bh.bb.bsize = -(b->bh.bb.bsize); /* Mark this buffer as owned by this thread. */ TCW_PTR(ba->bb.bthr, th); // not an allocated address (do not mark it) /* Zero the back pointer in the next buffer in memory to indicate that this buffer is allocated. */ ba->bb.prevfree = 0; /* Give user buffer starting at queue links. */ buf = (void *) &(b->ql); KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 ); return buf; } } /* Link to next buffer */ b = ( use_blink ? b->ql.blink : b->ql.flink ); } } /* We failed to find a buffer. If there's a compact function defined, notify it of the size requested. If it returns TRUE, try the allocation again. */ if ((thr->compfcn == 0) || (!(*thr->compfcn)(size, ++compactseq))) { break; } } /* No buffer available with requested size free. */ /* Don't give up yet -- look in the reserve supply. */ if (thr->acqfcn != 0) { if (size > (bufsize) (thr->exp_incr - sizeof(bhead_t))) { /* Request is too large to fit in a single expansion block. Try to satisy it by a direct buffer acquisition. */ bdhead_t *bdh; size += sizeof(bdhead_t) - sizeof(bhead_t); KE_TRACE( 10, ("%%%%%% MALLOC( %d )\n", (int) size ) ); /* richryan */ bdh = BDH((*thr->acqfcn)((bufsize) size)); if (bdh != NULL) { /* Mark the buffer special by setting the size field of its header to zero. */ bdh->bh.bb.bsize = 0; /* Mark this buffer as owned by this thread. */ TCW_PTR(bdh->bh.bb.bthr, th); // don't mark buffer as allocated, // because direct buffer never goes to free list bdh->bh.bb.prevfree = 0; bdh->tsize = size; #if BufStats thr->totalloc += (size_t) size; thr->numget++; /* Increment number of bget() calls */ thr->numdget++; /* Direct bget() call count */ #endif buf = (void *) (bdh + 1); KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 ); return buf; } } else { /* Try to obtain a new expansion block */ void *newpool; KE_TRACE( 10, ("%%%%%% MALLOCB( %d )\n", (int) thr->exp_incr ) ); /* richryan */ newpool = (*thr->acqfcn)((bufsize) thr->exp_incr); KMP_DEBUG_ASSERT( ((size_t)newpool) % SizeQuant == 0 ); if (newpool != NULL) { bpool( th, newpool, thr->exp_incr); buf = bget( th, requested_size); /* This can't, I say, can't get into a loop. */ return buf; } } } /* Still no buffer available */ return NULL; } /* BGETZ -- Allocate a buffer and clear its contents to zero. We clear the entire contents of the buffer to zero, not just the region requested by the caller. */ static void * bgetz( kmp_info_t *th, bufsize size ) { char *buf = (char *) bget( th, size); if (buf != NULL) { bhead_t *b; bufsize rsize; b = BH(buf - sizeof(bhead_t)); rsize = -(b->bb.bsize); if (rsize == 0) { bdhead_t *bd; bd = BDH(buf - sizeof(bdhead_t)); rsize = bd->tsize - (bufsize) sizeof(bdhead_t); } else { rsize -= sizeof(bhead_t); } KMP_DEBUG_ASSERT(rsize >= size); (void) memset(buf, 0, (bufsize) rsize); } return ((void *) buf); } /* BGETR -- Reallocate a buffer. This is a minimal implementation, simply in terms of brel() and bget(). It could be enhanced to allow the buffer to grow into adjacent free blocks and to avoid moving data unnecessarily. */ static void * bgetr( kmp_info_t *th, void *buf, bufsize size) { void *nbuf; bufsize osize; /* Old size of buffer */ bhead_t *b; nbuf = bget( th, size ); if ( nbuf == NULL ) { /* Acquire new buffer */ return NULL; } if ( buf == NULL ) { return nbuf; } b = BH(((char *) buf) - sizeof(bhead_t)); osize = -b->bb.bsize; if (osize == 0) { /* Buffer acquired directly through acqfcn. */ bdhead_t *bd; bd = BDH(((char *) buf) - sizeof(bdhead_t)); osize = bd->tsize - (bufsize) sizeof(bdhead_t); } else { osize -= sizeof(bhead_t); }; KMP_DEBUG_ASSERT(osize > 0); (void) KMP_MEMCPY((char *) nbuf, (char *) buf, /* Copy the data */ (size_t) ((size < osize) ? size : osize)); brel( th, buf ); return nbuf; } /* BREL -- Release a buffer. */ static void brel( kmp_info_t *th, void *buf ) { thr_data_t *thr = get_thr_data( th ); bfhead_t *b, *bn; kmp_info_t *bth; KMP_DEBUG_ASSERT(buf != NULL); KMP_DEBUG_ASSERT( ((size_t)buf) % SizeQuant == 0 ); b = BFH(((char *) buf) - sizeof(bhead_t)); if (b->bh.bb.bsize == 0) { /* Directly-acquired buffer? */ bdhead_t *bdh; bdh = BDH(((char *) buf) - sizeof(bdhead_t)); KMP_DEBUG_ASSERT(b->bh.bb.prevfree == 0); #if BufStats thr->totalloc -= (size_t) bdh->tsize; thr->numdrel++; /* Number of direct releases */ thr->numrel++; /* Increment number of brel() calls */ #endif /* BufStats */ #ifdef FreeWipe (void) memset((char *) buf, 0x55, (size_t) (bdh->tsize - sizeof(bdhead_t))); #endif /* FreeWipe */ KE_TRACE( 10, ("%%%%%% FREE( %p )\n", (void *) bdh ) ); KMP_DEBUG_ASSERT( thr->relfcn != 0 ); (*thr->relfcn)((void *) bdh); /* Release it directly. */ return; } bth = (kmp_info_t *)( (kmp_uintptr_t)TCR_PTR(b->bh.bb.bthr) & ~1 ); // clear possible mark before comparison if ( bth != th ) { /* Add this buffer to be released by the owning thread later */ __kmp_bget_enqueue( bth, buf #ifdef USE_QUEUING_LOCK_FOR_BGET , __kmp_gtid_from_thread( th ) #endif ); return; } /* Buffer size must be negative, indicating that the buffer is allocated. */ if (b->bh.bb.bsize >= 0) { bn = NULL; } KMP_DEBUG_ASSERT(b->bh.bb.bsize < 0); /* Back pointer in next buffer must be zero, indicating the same thing: */ KMP_DEBUG_ASSERT(BH((char *) b - b->bh.bb.bsize)->bb.prevfree == 0); #if BufStats thr->numrel++; /* Increment number of brel() calls */ thr->totalloc += (size_t) b->bh.bb.bsize; #endif /* If the back link is nonzero, the previous buffer is free. */ if (b->bh.bb.prevfree != 0) { /* The previous buffer is free. Consolidate this buffer with it by adding the length of this buffer to the previous free buffer. Note that we subtract the size in the buffer being released, since it's negative to indicate that the buffer is allocated. */ register bufsize size = b->bh.bb.bsize; /* Make the previous buffer the one we're working on. */ KMP_DEBUG_ASSERT(BH((char *) b - b->bh.bb.prevfree)->bb.bsize == b->bh.bb.prevfree); b = BFH(((char *) b) - b->bh.bb.prevfree); b->bh.bb.bsize -= size; /* unlink the buffer from the old freelist */ __kmp_bget_remove_from_freelist( b ); } else { /* The previous buffer isn't allocated. Mark this buffer size as positive (i.e. free) and fall through to place the buffer on the free list as an isolated free block. */ b->bh.bb.bsize = -b->bh.bb.bsize; } /* insert buffer back onto a new freelist */ __kmp_bget_insert_into_freelist( thr, b ); /* Now we look at the next buffer in memory, located by advancing from the start of this buffer by its size, to see if that buffer is free. If it is, we combine this buffer with the next one in memory, dechaining the second buffer from the free list. */ bn = BFH(((char *) b) + b->bh.bb.bsize); if (bn->bh.bb.bsize > 0) { /* The buffer is free. Remove it from the free list and add its size to that of our buffer. */ KMP_DEBUG_ASSERT(BH((char *) bn + bn->bh.bb.bsize)->bb.prevfree == bn->bh.bb.bsize); __kmp_bget_remove_from_freelist( bn ); b->bh.bb.bsize += bn->bh.bb.bsize; /* unlink the buffer from the old freelist, and reinsert it into the new freelist */ __kmp_bget_remove_from_freelist( b ); __kmp_bget_insert_into_freelist( thr, b ); /* Finally, advance to the buffer that follows the newly consolidated free block. We must set its backpointer to the head of the consolidated free block. We know the next block must be an allocated block because the process of recombination guarantees that two free blocks will never be contiguous in memory. */ bn = BFH(((char *) b) + b->bh.bb.bsize); } #ifdef FreeWipe (void) memset(((char *) b) + sizeof(bfhead_t), 0x55, (size_t) (b->bh.bb.bsize - sizeof(bfhead_t))); #endif KMP_DEBUG_ASSERT(bn->bh.bb.bsize < 0); /* The next buffer is allocated. Set the backpointer in it to point to this buffer; the previous free buffer in memory. */ bn->bh.bb.prevfree = b->bh.bb.bsize; /* If a block-release function is defined, and this free buffer constitutes the entire block, release it. Note that pool_len is defined in such a way that the test will fail unless all pool blocks are the same size. */ if (thr->relfcn != 0 && b->bh.bb.bsize == (bufsize)(thr->pool_len - sizeof(bhead_t))) { #if BufStats if (thr->numpblk != 1) { /* Do not release the last buffer until finalization time */ #endif KMP_DEBUG_ASSERT(b->bh.bb.prevfree == 0); KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.bsize == ESent); KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.prevfree == b->bh.bb.bsize); /* Unlink the buffer from the free list */ __kmp_bget_remove_from_freelist( b ); KE_TRACE( 10, ("%%%%%% FREE( %p )\n", (void *) b ) ); (*thr->relfcn)(b); #if BufStats thr->numprel++; /* Nr of expansion block releases */ thr->numpblk--; /* Total number of blocks */ KMP_DEBUG_ASSERT(thr->numpblk == thr->numpget - thr->numprel); /* avoid leaving stale last_pool pointer around if it is being dealloced */ if (thr->last_pool == b) thr->last_pool = 0; } else { thr->last_pool = b; } #endif /* BufStats */ } } /* BECTL -- Establish automatic pool expansion control */ static void bectl( kmp_info_t *th, bget_compact_t compact, bget_acquire_t acquire, bget_release_t release, bufsize pool_incr) { thr_data_t *thr = get_thr_data( th ); thr->compfcn = compact; thr->acqfcn = acquire; thr->relfcn = release; thr->exp_incr = pool_incr; } /* BPOOL -- Add a region of memory to the buffer pool. */ static void bpool( kmp_info_t *th, void *buf, bufsize len) { /* int bin = 0; */ thr_data_t *thr = get_thr_data( th ); bfhead_t *b = BFH(buf); bhead_t *bn; __kmp_bget_dequeue( th ); /* Release any queued buffers */ #ifdef SizeQuant len &= ~(SizeQuant - 1); #endif if (thr->pool_len == 0) { thr->pool_len = len; } else if (len != thr->pool_len) { thr->pool_len = -1; } #if BufStats thr->numpget++; /* Number of block acquisitions */ thr->numpblk++; /* Number of blocks total */ KMP_DEBUG_ASSERT(thr->numpblk == thr->numpget - thr->numprel); #endif /* BufStats */ /* Since the block is initially occupied by a single free buffer, it had better not be (much) larger than the largest buffer whose size we can store in bhead.bb.bsize. */ KMP_DEBUG_ASSERT(len - sizeof(bhead_t) <= -((bufsize) ESent + 1)); /* Clear the backpointer at the start of the block to indicate that there is no free block prior to this one. That blocks recombination when the first block in memory is released. */ b->bh.bb.prevfree = 0; /* Create a dummy allocated buffer at the end of the pool. This dummy buffer is seen when a buffer at the end of the pool is released and blocks recombination of the last buffer with the dummy buffer at the end. The length in the dummy buffer is set to the largest negative number to denote the end of the pool for diagnostic routines (this specific value is not counted on by the actual allocation and release functions). */ len -= sizeof(bhead_t); b->bh.bb.bsize = (bufsize) len; /* Set the owner of this buffer */ TCW_PTR( b->bh.bb.bthr, (kmp_info_t*)((kmp_uintptr_t)th | 1) ); // mark the buffer as allocated address /* Chain the new block to the free list. */ __kmp_bget_insert_into_freelist( thr, b ); #ifdef FreeWipe (void) memset(((char *) b) + sizeof(bfhead_t), 0x55, (size_t) (len - sizeof(bfhead_t))); #endif bn = BH(((char *) b) + len); bn->bb.prevfree = (bufsize) len; /* Definition of ESent assumes two's complement! */ KMP_DEBUG_ASSERT( (~0) == -1 && (bn != 0) ); bn->bb.bsize = ESent; } /* ------------------------------------------------------------------------ */ /* BFREED -- Dump the free lists for this thread. */ static void bfreed( kmp_info_t *th ) { int bin = 0, count = 0; int gtid = __kmp_gtid_from_thread( th ); thr_data_t *thr = get_thr_data( th ); #if BufStats __kmp_printf_no_lock("__kmp_printpool: T#%d total=%" KMP_UINT64_SPEC " get=%" KMP_INT64_SPEC " rel=%" \ KMP_INT64_SPEC " pblk=%" KMP_INT64_SPEC " pget=%" KMP_INT64_SPEC " prel=%" KMP_INT64_SPEC \ " dget=%" KMP_INT64_SPEC " drel=%" KMP_INT64_SPEC "\n", gtid, (kmp_uint64) thr->totalloc, (kmp_int64) thr->numget, (kmp_int64) thr->numrel, (kmp_int64) thr->numpblk, (kmp_int64) thr->numpget, (kmp_int64) thr->numprel, (kmp_int64) thr->numdget, (kmp_int64) thr->numdrel ); #endif for (bin = 0; bin < MAX_BGET_BINS; ++bin) { bfhead_t *b; for (b = thr->freelist[ bin ].ql.flink; b != &thr->freelist[ bin ]; b = b->ql.flink) { bufsize bs = b->bh.bb.bsize; KMP_DEBUG_ASSERT( b->ql.blink->ql.flink == b ); KMP_DEBUG_ASSERT( b->ql.flink->ql.blink == b ); KMP_DEBUG_ASSERT( bs > 0 ); count += 1; __kmp_printf_no_lock("__kmp_printpool: T#%d Free block: 0x%p size %6ld bytes.\n", gtid, b, (long) bs ); #ifdef FreeWipe { char *lerr = ((char *) b) + sizeof(bfhead_t); if ((bs > sizeof(bfhead_t)) && ((*lerr != 0x55) || (memcmp(lerr, lerr + 1, (size_t) (bs - (sizeof(bfhead_t) + 1))) != 0))) { __kmp_printf_no_lock( "__kmp_printpool: T#%d (Contents of above free block have been overstored.)\n", gtid ); } } #endif } } if (count == 0) __kmp_printf_no_lock("__kmp_printpool: T#%d No free blocks\n", gtid ); } /* ------------------------------------------------------------------------ */ #ifdef KMP_DEBUG #if BufStats /* BSTATS -- Return buffer allocation free space statistics. */ static void bstats( kmp_info_t *th, bufsize *curalloc, bufsize *totfree, bufsize *maxfree, long *nget, long *nrel) { int bin = 0; thr_data_t *thr = get_thr_data( th ); *nget = thr->numget; *nrel = thr->numrel; *curalloc = (bufsize) thr->totalloc; *totfree = 0; *maxfree = -1; for (bin = 0; bin < MAX_BGET_BINS; ++bin) { bfhead_t *b = thr->freelist[ bin ].ql.flink; while (b != &thr->freelist[ bin ]) { KMP_DEBUG_ASSERT(b->bh.bb.bsize > 0); *totfree += b->bh.bb.bsize; if (b->bh.bb.bsize > *maxfree) { *maxfree = b->bh.bb.bsize; } b = b->ql.flink; /* Link to next buffer */ } } } /* BSTATSE -- Return extended statistics */ static void bstatse( kmp_info_t *th, bufsize *pool_incr, long *npool, long *npget, long *nprel, long *ndget, long *ndrel) { thr_data_t *thr = get_thr_data( th ); *pool_incr = (thr->pool_len < 0) ? -thr->exp_incr : thr->exp_incr; *npool = thr->numpblk; *npget = thr->numpget; *nprel = thr->numprel; *ndget = thr->numdget; *ndrel = thr->numdrel; } #endif /* BufStats */ /* BUFDUMP -- Dump the data in a buffer. This is called with the user data pointer, and backs up to the buffer header. It will dump either a free block or an allocated one. */ static void bufdump( kmp_info_t *th, void *buf ) { bfhead_t *b; unsigned char *bdump; bufsize bdlen; b = BFH(((char *) buf) - sizeof(bhead_t)); KMP_DEBUG_ASSERT(b->bh.bb.bsize != 0); if (b->bh.bb.bsize < 0) { bdump = (unsigned char *) buf; bdlen = (-b->bh.bb.bsize) - (bufsize) sizeof(bhead_t); } else { bdump = (unsigned char *) (((char *) b) + sizeof(bfhead_t)); bdlen = b->bh.bb.bsize - (bufsize) sizeof(bfhead_t); } while (bdlen > 0) { int i, dupes = 0; bufsize l = bdlen; char bhex[50], bascii[20]; if (l > 16) { l = 16; } for (i = 0; i < l; i++) { (void) KMP_SNPRINTF(bhex + i * 3, sizeof(bhex) - i * 3, "%02X ", bdump[i]); if (bdump[i] > 0x20 && bdump[i] < 0x7F) bascii[ i ] = bdump[ i ]; else bascii[ i ] = ' '; } bascii[i] = 0; (void) __kmp_printf_no_lock("%-48s %s\n", bhex, bascii); bdump += l; bdlen -= l; while ((bdlen > 16) && (memcmp((char *) (bdump - 16), (char *) bdump, 16) == 0)) { dupes++; bdump += 16; bdlen -= 16; } if (dupes > 1) { (void) __kmp_printf_no_lock( " (%d lines [%d bytes] identical to above line skipped)\n", dupes, dupes * 16); } else if (dupes == 1) { bdump -= 16; bdlen += 16; } } } /* BPOOLD -- Dump a buffer pool. The buffer headers are always listed. If DUMPALLOC is nonzero, the contents of allocated buffers are dumped. If DUMPFREE is nonzero, free blocks are dumped as well. If FreeWipe checking is enabled, free blocks which have been clobbered will always be dumped. */ static void bpoold( kmp_info_t *th, void *buf, int dumpalloc, int dumpfree) { bfhead_t *b = BFH( (char*)buf - sizeof(bhead_t)); while (b->bh.bb.bsize != ESent) { bufsize bs = b->bh.bb.bsize; if (bs < 0) { bs = -bs; (void) __kmp_printf_no_lock("Allocated buffer: size %6ld bytes.\n", (long) bs); if (dumpalloc) { bufdump( th, (void *) (((char *) b) + sizeof(bhead_t))); } } else { const char *lerr = ""; KMP_DEBUG_ASSERT(bs > 0); if ((b->ql.blink->ql.flink != b) || (b->ql.flink->ql.blink != b)) { lerr = " (Bad free list links)"; } (void) __kmp_printf_no_lock("Free block: size %6ld bytes.%s\n", (long) bs, lerr); #ifdef FreeWipe lerr = ((char *) b) + sizeof(bfhead_t); if ((bs > sizeof(bfhead_t)) && ((*lerr != 0x55) || (memcmp(lerr, lerr + 1, (size_t) (bs - (sizeof(bfhead_t) + 1))) != 0))) { (void) __kmp_printf_no_lock( "(Contents of above free block have been overstored.)\n"); bufdump( th, (void *) (((char *) b) + sizeof(bhead_t))); } else #endif if (dumpfree) { bufdump( th, (void *) (((char *) b) + sizeof(bhead_t))); } } b = BFH(((char *) b) + bs); } } /* BPOOLV -- Validate a buffer pool. */ static int bpoolv( kmp_info_t *th, void *buf ) { bfhead_t *b = BFH(buf); while (b->bh.bb.bsize != ESent) { bufsize bs = b->bh.bb.bsize; if (bs < 0) { bs = -bs; } else { #ifdef FreeWipe char *lerr = ""; #endif KMP_DEBUG_ASSERT(bs > 0); if (bs <= 0) { return 0; } if ((b->ql.blink->ql.flink != b) || (b->ql.flink->ql.blink != b)) { (void) __kmp_printf_no_lock("Free block: size %6ld bytes. (Bad free list links)\n", (long) bs); KMP_DEBUG_ASSERT(0); return 0; } #ifdef FreeWipe lerr = ((char *) b) + sizeof(bfhead_t); if ((bs > sizeof(bfhead_t)) && ((*lerr != 0x55) || (memcmp(lerr, lerr + 1, (size_t) (bs - (sizeof(bfhead_t) + 1))) != 0))) { (void) __kmp_printf_no_lock( "(Contents of above free block have been overstored.)\n"); bufdump( th, (void *) (((char *) b) + sizeof(bhead_t))); KMP_DEBUG_ASSERT(0); return 0; } #endif /* FreeWipe */ } b = BFH(((char *) b) + bs); } return 1; } #endif /* KMP_DEBUG */ /* ------------------------------------------------------------------------ */ void __kmp_initialize_bget( kmp_info_t *th ) { KMP_DEBUG_ASSERT( SizeQuant >= sizeof( void * ) && (th != 0) ); set_thr_data( th ); bectl( th, (bget_compact_t) 0, (bget_acquire_t) malloc, (bget_release_t) free, (bufsize) __kmp_malloc_pool_incr ); } void __kmp_finalize_bget( kmp_info_t *th ) { thr_data_t *thr; bfhead_t *b; KMP_DEBUG_ASSERT( th != 0 ); #if BufStats thr = (thr_data_t *) th->th.th_local.bget_data; KMP_DEBUG_ASSERT( thr != NULL ); b = thr->last_pool; /* If a block-release function is defined, and this free buffer constitutes the entire block, release it. Note that pool_len is defined in such a way that the test will fail unless all pool blocks are the same size. */ /* Deallocate the last pool if one exists because we no longer do it in brel() */ if (thr->relfcn != 0 && b != 0 && thr->numpblk != 0 && b->bh.bb.bsize == (bufsize)(thr->pool_len - sizeof(bhead_t))) { KMP_DEBUG_ASSERT(b->bh.bb.prevfree == 0); KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.bsize == ESent); KMP_DEBUG_ASSERT(BH((char *) b + b->bh.bb.bsize)->bb.prevfree == b->bh.bb.bsize); /* Unlink the buffer from the free list */ __kmp_bget_remove_from_freelist( b ); KE_TRACE( 10, ("%%%%%% FREE( %p )\n", (void *) b ) ); (*thr->relfcn)(b); thr->numprel++; /* Nr of expansion block releases */ thr->numpblk--; /* Total number of blocks */ KMP_DEBUG_ASSERT(thr->numpblk == thr->numpget - thr->numprel); } #endif /* BufStats */ /* Deallocate bget_data */ if ( th->th.th_local.bget_data != NULL ) { __kmp_free( th->th.th_local.bget_data ); th->th.th_local.bget_data = NULL; }; // if } void kmpc_set_poolsize( size_t size ) { bectl( __kmp_get_thread(), (bget_compact_t) 0, (bget_acquire_t) malloc, (bget_release_t) free, (bufsize) size ); } size_t kmpc_get_poolsize( void ) { thr_data_t *p; p = get_thr_data( __kmp_get_thread() ); return p->exp_incr; } void kmpc_set_poolmode( int mode ) { thr_data_t *p; if (mode == bget_mode_fifo || mode == bget_mode_lifo || mode == bget_mode_best) { p = get_thr_data( __kmp_get_thread() ); p->mode = (bget_mode_t) mode; } } int kmpc_get_poolmode( void ) { thr_data_t *p; p = get_thr_data( __kmp_get_thread() ); return p->mode; } void kmpc_get_poolstat( size_t *maxmem, size_t *allmem ) { kmp_info_t *th = __kmp_get_thread(); bufsize a, b; __kmp_bget_dequeue( th ); /* Release any queued buffers */ bcheck( th, &a, &b ); *maxmem = a; *allmem = b; } void kmpc_poolprint( void ) { kmp_info_t *th = __kmp_get_thread(); __kmp_bget_dequeue( th ); /* Release any queued buffers */ bfreed( th ); } #endif // #if KMP_USE_BGET /* ------------------------------------------------------------------------ */ void * kmpc_malloc( size_t size ) { void * ptr; ptr = bget( __kmp_entry_thread(), (bufsize)(size + sizeof(ptr)) ); if( ptr != NULL ) { // save allocated pointer just before one returned to user *(void**)ptr = ptr; ptr = (void**)ptr + 1; } return ptr; } #define IS_POWER_OF_TWO(n) (((n)&((n)-1))==0) void * kmpc_aligned_malloc( size_t size, size_t alignment ) { void * ptr; void * ptr_allocated; KMP_DEBUG_ASSERT( alignment < 32 * 1024 ); // Alignment should not be too big if( !IS_POWER_OF_TWO(alignment) ) { // AC: do we need to issue a warning here? errno = EINVAL; return NULL; } size = size + sizeof( void* ) + alignment; ptr_allocated = bget( __kmp_entry_thread(), (bufsize)size ); if( ptr_allocated != NULL ) { // save allocated pointer just before one returned to user ptr = (void*)(((kmp_uintptr_t)ptr_allocated + sizeof( void* ) + alignment) & ~(alignment - 1)); *((void**)ptr - 1) = ptr_allocated; } else { ptr = NULL; } return ptr; } void * kmpc_calloc( size_t nelem, size_t elsize ) { void * ptr; ptr = bgetz( __kmp_entry_thread(), (bufsize) (nelem * elsize + sizeof(ptr)) ); if( ptr != NULL ) { // save allocated pointer just before one returned to user *(void**)ptr = ptr; ptr = (void**)ptr + 1; } return ptr; } void * kmpc_realloc( void * ptr, size_t size ) { void * result = NULL; if ( ptr == NULL ) { // If pointer is NULL, realloc behaves like malloc. result = bget( __kmp_entry_thread(), (bufsize)(size + sizeof(ptr)) ); // save allocated pointer just before one returned to user if( result != NULL ) { *(void**)result = result; result = (void**)result + 1; } } else if ( size == 0 ) { // If size is 0, realloc behaves like free. // The thread must be registered by the call to kmpc_malloc() or kmpc_calloc() before. // So it should be safe to call __kmp_get_thread(), not __kmp_entry_thread(). KMP_ASSERT(*((void**)ptr - 1)); brel( __kmp_get_thread(), *((void**)ptr - 1) ); } else { result = bgetr( __kmp_entry_thread(), *((void**)ptr - 1), (bufsize)(size + sizeof(ptr)) ); if( result != NULL ) { *(void**)result = result; result = (void**)result + 1; } }; // if return result; } /* NOTE: the library must have already been initialized by a previous allocate */ void kmpc_free( void * ptr ) { if ( ! __kmp_init_serial ) { return; }; // if if ( ptr != NULL ) { kmp_info_t *th = __kmp_get_thread(); __kmp_bget_dequeue( th ); /* Release any queued buffers */ // extract allocated pointer and free it KMP_ASSERT(*((void**)ptr - 1)); brel( th, *((void**)ptr - 1) ); }; } /* ------------------------------------------------------------------------ */ void * ___kmp_thread_malloc( kmp_info_t *th, size_t size KMP_SRC_LOC_DECL ) { void * ptr; KE_TRACE( 30, ( "-> __kmp_thread_malloc( %p, %d ) called from %s:%d\n", th, (int) size KMP_SRC_LOC_PARM ) ); ptr = bget( th, (bufsize) size ); KE_TRACE( 30, ( "<- __kmp_thread_malloc() returns %p\n", ptr ) ); return ptr; } void * ___kmp_thread_calloc( kmp_info_t *th, size_t nelem, size_t elsize KMP_SRC_LOC_DECL ) { void * ptr; KE_TRACE( 30, ( "-> __kmp_thread_calloc( %p, %d, %d ) called from %s:%d\n", th, (int) nelem, (int) elsize KMP_SRC_LOC_PARM ) ); ptr = bgetz( th, (bufsize) (nelem * elsize) ); KE_TRACE( 30, ( "<- __kmp_thread_calloc() returns %p\n", ptr ) ); return ptr; } void * ___kmp_thread_realloc( kmp_info_t *th, void *ptr, size_t size KMP_SRC_LOC_DECL ) { KE_TRACE( 30, ( "-> __kmp_thread_realloc( %p, %p, %d ) called from %s:%d\n", th, ptr, (int) size KMP_SRC_LOC_PARM ) ); ptr = bgetr( th, ptr, (bufsize) size ); KE_TRACE( 30, ( "<- __kmp_thread_realloc() returns %p\n", ptr ) ); return ptr; } void ___kmp_thread_free( kmp_info_t *th, void *ptr KMP_SRC_LOC_DECL ) { KE_TRACE( 30, ( "-> __kmp_thread_free( %p, %p ) called from %s:%d\n", th, ptr KMP_SRC_LOC_PARM ) ); if ( ptr != NULL ) { __kmp_bget_dequeue( th ); /* Release any queued buffers */ brel( th, ptr ); } KE_TRACE( 30, ( "<- __kmp_thread_free()\n" ) ); } /* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */ /* If LEAK_MEMORY is defined, __kmp_free() will *not* free memory. It causes memory leaks, but it may be useful for debugging memory corruptions, used freed pointers, etc. */ /* #define LEAK_MEMORY */ struct kmp_mem_descr { // Memory block descriptor. void * ptr_allocated; // Pointer returned by malloc(), subject for free(). size_t size_allocated; // Size of allocated memory block. void * ptr_aligned; // Pointer to aligned memory, to be used by client code. size_t size_aligned; // Size of aligned memory block. }; typedef struct kmp_mem_descr kmp_mem_descr_t; /* Allocate memory on requested boundary, fill allocated memory with 0x00. NULL is NEVER returned, __kmp_abort() is called in case of memory allocation error. Must use __kmp_free when freeing memory allocated by this routine! */ static void * ___kmp_allocate_align( size_t size, size_t alignment KMP_SRC_LOC_DECL ) { /* __kmp_allocate() allocates (by call to malloc()) bigger memory block than requested to return properly aligned pointer. Original pointer returned by malloc() and size of allocated block is saved in descriptor just before the aligned pointer. This information used by __kmp_free() -- it has to pass to free() original pointer, not aligned one. +---------+------------+-----------------------------------+---------+ | padding | descriptor | aligned block | padding | +---------+------------+-----------------------------------+---------+ ^ ^ | | | +- Aligned pointer returned to caller +- Pointer returned by malloc() Aligned block is filled with zeros, paddings are filled with 0xEF. */ kmp_mem_descr_t descr; kmp_uintptr_t addr_allocated; // Address returned by malloc(). kmp_uintptr_t addr_aligned; // Aligned address to return to caller. kmp_uintptr_t addr_descr; // Address of memory block descriptor. KE_TRACE( 25, ( "-> ___kmp_allocate_align( %d, %d ) called from %s:%d\n", (int) size, (int) alignment KMP_SRC_LOC_PARM ) ); KMP_DEBUG_ASSERT( alignment < 32 * 1024 ); // Alignment should not be too KMP_DEBUG_ASSERT( sizeof( void * ) <= sizeof( kmp_uintptr_t ) ); // Make sure kmp_uintptr_t is enough to store addresses. descr.size_aligned = size; descr.size_allocated = descr.size_aligned + sizeof( kmp_mem_descr_t ) + alignment; #if KMP_DEBUG descr.ptr_allocated = _malloc_src_loc( descr.size_allocated, _file_, _line_ ); #else descr.ptr_allocated = malloc_src_loc( descr.size_allocated KMP_SRC_LOC_PARM ); #endif KE_TRACE( 10, ( " malloc( %d ) returned %p\n", (int) descr.size_allocated, descr.ptr_allocated ) ); if ( descr.ptr_allocated == NULL ) { KMP_FATAL( OutOfHeapMemory ); }; addr_allocated = (kmp_uintptr_t) descr.ptr_allocated; addr_aligned = ( addr_allocated + sizeof( kmp_mem_descr_t ) + alignment ) & ~ ( alignment - 1 ); addr_descr = addr_aligned - sizeof( kmp_mem_descr_t ); descr.ptr_aligned = (void *) addr_aligned; KE_TRACE( 26, ( " ___kmp_allocate_align: " "ptr_allocated=%p, size_allocated=%d, " "ptr_aligned=%p, size_aligned=%d\n", descr.ptr_allocated, (int) descr.size_allocated, descr.ptr_aligned, (int) descr.size_aligned ) ); KMP_DEBUG_ASSERT( addr_allocated <= addr_descr ); KMP_DEBUG_ASSERT( addr_descr + sizeof( kmp_mem_descr_t ) == addr_aligned ); KMP_DEBUG_ASSERT( addr_aligned + descr.size_aligned <= addr_allocated + descr.size_allocated ); KMP_DEBUG_ASSERT( addr_aligned % alignment == 0 ); #ifdef KMP_DEBUG memset( descr.ptr_allocated, 0xEF, descr.size_allocated ); // Fill allocated memory block with 0xEF. #endif memset( descr.ptr_aligned, 0x00, descr.size_aligned ); // Fill the aligned memory block (which is intended for using by caller) with 0x00. Do not // put this filling under KMP_DEBUG condition! Many callers expect zeroed memory. (Padding // bytes remain filled with 0xEF in debugging library.) * ( (kmp_mem_descr_t *) addr_descr ) = descr; KMP_MB(); KE_TRACE( 25, ( "<- ___kmp_allocate_align() returns %p\n", descr.ptr_aligned ) ); return descr.ptr_aligned; } // func ___kmp_allocate_align /* Allocate memory on cache line boundary, fill allocated memory with 0x00. Do not call this func directly! Use __kmp_allocate macro instead. NULL is NEVER returned, __kmp_abort() is called in case of memory allocation error. Must use __kmp_free when freeing memory allocated by this routine! */ void * ___kmp_allocate( size_t size KMP_SRC_LOC_DECL ) { void * ptr; KE_TRACE( 25, ( "-> __kmp_allocate( %d ) called from %s:%d\n", (int) size KMP_SRC_LOC_PARM ) ); ptr = ___kmp_allocate_align( size, __kmp_align_alloc KMP_SRC_LOC_PARM ); KE_TRACE( 25, ( "<- __kmp_allocate() returns %p\n", ptr ) ); return ptr; } // func ___kmp_allocate #if (BUILD_MEMORY==FIRST_TOUCH) void * __kmp_ft_page_allocate(size_t size) { void *adr, *aadr; const int page_size = KMP_GET_PAGE_SIZE(); adr = (void *) __kmp_thread_malloc( __kmp_get_thread(), size + page_size + KMP_PTR_SKIP); if ( adr == 0 ) KMP_FATAL( OutOfHeapMemory ); /* check to see if adr is on a page boundary. */ if ( ( (kmp_uintptr_t) adr & (page_size - 1)) == 0) /* nothing to do if adr is already on a page boundary. */ aadr = adr; else /* else set aadr to the first page boundary in the allocated memory. */ aadr = (void *) ( ( (kmp_uintptr_t) adr + page_size) & ~(page_size - 1) ); /* the first touch by the owner thread. */ *((void**)aadr) = adr; /* skip the memory space used for storing adr above. */ return (void*)((char*)aadr + KMP_PTR_SKIP); } #endif /* Allocate memory on page boundary, fill allocated memory with 0x00. Does not call this func directly! Use __kmp_page_allocate macro instead. NULL is NEVER returned, __kmp_abort() is called in case of memory allocation error. Must use __kmp_free when freeing memory allocated by this routine! */ void * ___kmp_page_allocate( size_t size KMP_SRC_LOC_DECL ) { int page_size = 8 * 1024; void * ptr; KE_TRACE( 25, ( "-> __kmp_page_allocate( %d ) called from %s:%d\n", (int) size KMP_SRC_LOC_PARM ) ); ptr = ___kmp_allocate_align( size, page_size KMP_SRC_LOC_PARM ); KE_TRACE( 25, ( "<- __kmp_page_allocate( %d ) returns %p\n", (int) size, ptr ) ); return ptr; } // ___kmp_page_allocate /* Free memory allocated by __kmp_allocate() and __kmp_page_allocate(). In debug mode, fill the memory block with 0xEF before call to free(). */ void ___kmp_free( void * ptr KMP_SRC_LOC_DECL ) { kmp_mem_descr_t descr; kmp_uintptr_t addr_allocated; // Address returned by malloc(). kmp_uintptr_t addr_aligned; // Aligned address passed by caller. KE_TRACE( 25, ( "-> __kmp_free( %p ) called from %s:%d\n", ptr KMP_SRC_LOC_PARM ) ); KMP_ASSERT( ptr != NULL ); descr = * ( kmp_mem_descr_t *) ( (kmp_uintptr_t) ptr - sizeof( kmp_mem_descr_t ) ); KE_TRACE( 26, ( " __kmp_free: " "ptr_allocated=%p, size_allocated=%d, " "ptr_aligned=%p, size_aligned=%d\n", descr.ptr_allocated, (int) descr.size_allocated, descr.ptr_aligned, (int) descr.size_aligned )); addr_allocated = (kmp_uintptr_t) descr.ptr_allocated; addr_aligned = (kmp_uintptr_t) descr.ptr_aligned; KMP_DEBUG_ASSERT( addr_aligned % CACHE_LINE == 0 ); KMP_DEBUG_ASSERT( descr.ptr_aligned == ptr ); KMP_DEBUG_ASSERT( addr_allocated + sizeof( kmp_mem_descr_t ) <= addr_aligned ); KMP_DEBUG_ASSERT( descr.size_aligned < descr.size_allocated ); KMP_DEBUG_ASSERT( addr_aligned + descr.size_aligned <= addr_allocated + descr.size_allocated ); #ifdef KMP_DEBUG memset( descr.ptr_allocated, 0xEF, descr.size_allocated ); // Fill memory block with 0xEF, it helps catch using freed memory. #endif #ifndef LEAK_MEMORY KE_TRACE( 10, ( " free( %p )\n", descr.ptr_allocated ) ); # ifdef KMP_DEBUG _free_src_loc( descr.ptr_allocated, _file_, _line_ ); # else free_src_loc( descr.ptr_allocated KMP_SRC_LOC_PARM ); # endif #endif KMP_MB(); KE_TRACE( 25, ( "<- __kmp_free() returns\n" ) ); } // func ___kmp_free /* ------------------------------------------------------------------------ */ /* ------------------------------------------------------------------------ */ #if USE_FAST_MEMORY == 3 // Allocate fast memory by first scanning the thread's free lists // If a chunk the right size exists, grab it off the free list. // Otherwise allocate normally using kmp_thread_malloc. // AC: How to choose the limit? Just get 16 for now... #define KMP_FREE_LIST_LIMIT 16 // Always use 128 bytes for determining buckets for caching memory blocks #define DCACHE_LINE 128 void * ___kmp_fast_allocate( kmp_info_t *this_thr, size_t size KMP_SRC_LOC_DECL ) { void * ptr; int num_lines; int idx; int index; void * alloc_ptr; size_t alloc_size; kmp_mem_descr_t * descr; KE_TRACE( 25, ( "-> __kmp_fast_allocate( T#%d, %d ) called from %s:%d\n", __kmp_gtid_from_thread(this_thr), (int) size KMP_SRC_LOC_PARM ) ); num_lines = ( size + DCACHE_LINE - 1 ) / DCACHE_LINE; idx = num_lines - 1; KMP_DEBUG_ASSERT( idx >= 0 ); if ( idx < 2 ) { index = 0; // idx is [ 0, 1 ], use first free list num_lines = 2; // 1, 2 cache lines or less than cache line } else if ( ( idx >>= 2 ) == 0 ) { index = 1; // idx is [ 2, 3 ], use second free list num_lines = 4; // 3, 4 cache lines } else if ( ( idx >>= 2 ) == 0 ) { index = 2; // idx is [ 4, 15 ], use third free list num_lines = 16; // 5, 6, ..., 16 cache lines } else if ( ( idx >>= 2 ) == 0 ) { index = 3; // idx is [ 16, 63 ], use fourth free list num_lines = 64; // 17, 18, ..., 64 cache lines } else { goto alloc_call; // 65 or more cache lines ( > 8KB ), don't use free lists } ptr = this_thr->th.th_free_lists[index].th_free_list_self; if ( ptr != NULL ) { // pop the head of no-sync free list this_thr->th.th_free_lists[index].th_free_list_self = *((void **)ptr); KMP_DEBUG_ASSERT( this_thr == ((kmp_mem_descr_t *)( (kmp_uintptr_t)ptr - sizeof(kmp_mem_descr_t) ))->ptr_aligned ); goto end; }; ptr = TCR_SYNC_PTR( this_thr->th.th_free_lists[index].th_free_list_sync ); if ( ptr != NULL ) { // no-sync free list is empty, use sync free list (filled in by other threads only) // pop the head of the sync free list, push NULL instead while ( ! KMP_COMPARE_AND_STORE_PTR( &this_thr->th.th_free_lists[index].th_free_list_sync, ptr, NULL ) ) { KMP_CPU_PAUSE(); ptr = TCR_SYNC_PTR( this_thr->th.th_free_lists[index].th_free_list_sync ); } // push the rest of chain into no-sync free list (can be NULL if there was the only block) this_thr->th.th_free_lists[index].th_free_list_self = *((void **)ptr); KMP_DEBUG_ASSERT( this_thr == ((kmp_mem_descr_t *)( (kmp_uintptr_t)ptr - sizeof(kmp_mem_descr_t) ))->ptr_aligned ); goto end; } alloc_call: // haven't found block in the free lists, thus allocate it size = num_lines * DCACHE_LINE; alloc_size = size + sizeof( kmp_mem_descr_t ) + DCACHE_LINE; KE_TRACE( 25, ( "__kmp_fast_allocate: T#%d Calling __kmp_thread_malloc with alloc_size %d\n", __kmp_gtid_from_thread( this_thr ), alloc_size ) ); alloc_ptr = bget( this_thr, (bufsize) alloc_size ); // align ptr to DCACHE_LINE ptr = (void *)(( ((kmp_uintptr_t)alloc_ptr) + sizeof(kmp_mem_descr_t) + DCACHE_LINE ) & ~( DCACHE_LINE - 1 )); descr = (kmp_mem_descr_t *)( ((kmp_uintptr_t)ptr) - sizeof(kmp_mem_descr_t) ); descr->ptr_allocated = alloc_ptr; // remember allocated pointer // we don't need size_allocated descr->ptr_aligned = (void *)this_thr; // remember allocating thread // (it is already saved in bget buffer, // but we may want to use another allocator in future) descr->size_aligned = size; end: KE_TRACE( 25, ( "<- __kmp_fast_allocate( T#%d ) returns %p\n", __kmp_gtid_from_thread( this_thr ), ptr ) ); return ptr; } // func __kmp_fast_allocate // Free fast memory and place it on the thread's free list if it is of // the correct size. void ___kmp_fast_free( kmp_info_t *this_thr, void * ptr KMP_SRC_LOC_DECL ) { kmp_mem_descr_t * descr; kmp_info_t * alloc_thr; size_t size; size_t idx; int index; KE_TRACE( 25, ( "-> __kmp_fast_free( T#%d, %p ) called from %s:%d\n", __kmp_gtid_from_thread(this_thr), ptr KMP_SRC_LOC_PARM ) ); KMP_ASSERT( ptr != NULL ); descr = (kmp_mem_descr_t *)( ((kmp_uintptr_t)ptr) - sizeof(kmp_mem_descr_t) ); KE_TRACE(26, (" __kmp_fast_free: size_aligned=%d\n", (int) descr->size_aligned ) ); size = descr->size_aligned; // 2, 4, 16, 64, 65, 66, ... cache lines idx = DCACHE_LINE * 2; // 2 cache lines is minimal size of block if ( idx == size ) { index = 0; // 2 cache lines } else if ( ( idx <<= 1 ) == size ) { index = 1; // 4 cache lines } else if ( ( idx <<= 2 ) == size ) { index = 2; // 16 cache lines } else if ( ( idx <<= 2 ) == size ) { index = 3; // 64 cache lines } else { KMP_DEBUG_ASSERT( size > DCACHE_LINE * 64 ); goto free_call; // 65 or more cache lines ( > 8KB ) } alloc_thr = (kmp_info_t *)descr->ptr_aligned; // get thread owning the block if ( alloc_thr == this_thr ) { // push block to self no-sync free list, linking previous head (LIFO) *((void **)ptr) = this_thr->th.th_free_lists[index].th_free_list_self; this_thr->th.th_free_lists[index].th_free_list_self = ptr; } else { void * head = this_thr->th.th_free_lists[index].th_free_list_other; if ( head == NULL ) { // Create new free list this_thr->th.th_free_lists[index].th_free_list_other = ptr; *((void **)ptr) = NULL; // mark the tail of the list descr->size_allocated = (size_t)1; // head of the list keeps its length } else { // need to check existed "other" list's owner thread and size of queue kmp_mem_descr_t * dsc = (kmp_mem_descr_t *)( (char*)head - sizeof(kmp_mem_descr_t) ); kmp_info_t * q_th = (kmp_info_t *)(dsc->ptr_aligned); // allocating thread, same for all queue nodes size_t q_sz = dsc->size_allocated + 1; // new size in case we add current task if ( q_th == alloc_thr && q_sz <= KMP_FREE_LIST_LIMIT ) { // we can add current task to "other" list, no sync needed *((void **)ptr) = head; descr->size_allocated = q_sz; this_thr->th.th_free_lists[index].th_free_list_other = ptr; } else { // either queue blocks owner is changing or size limit exceeded // return old queue to allocating thread (q_th) synchroneously, // and start new list for alloc_thr's tasks void * old_ptr; void * tail = head; void * next = *((void **)head); while ( next != NULL ) { KMP_DEBUG_ASSERT( // queue size should decrease by 1 each step through the list ((kmp_mem_descr_t*)((char*)next - sizeof(kmp_mem_descr_t)))->size_allocated + 1 == ((kmp_mem_descr_t*)((char*)tail - sizeof(kmp_mem_descr_t)))->size_allocated ); tail = next; // remember tail node next = *((void **)next); } KMP_DEBUG_ASSERT( q_th != NULL ); // push block to owner's sync free list old_ptr = TCR_PTR( q_th->th.th_free_lists[index].th_free_list_sync ); /* the next pointer must be set before setting free_list to ptr to avoid exposing a broken list to other threads, even for an instant. */ *((void **)tail) = old_ptr; while ( ! KMP_COMPARE_AND_STORE_PTR( &q_th->th.th_free_lists[index].th_free_list_sync, old_ptr, head ) ) { KMP_CPU_PAUSE(); old_ptr = TCR_PTR( q_th->th.th_free_lists[index].th_free_list_sync ); *((void **)tail) = old_ptr; } // start new list of not-selt tasks this_thr->th.th_free_lists[index].th_free_list_other = ptr; *((void **)ptr) = NULL; descr->size_allocated = (size_t)1; // head of queue keeps its length } } } goto end; free_call: KE_TRACE(25, ( "__kmp_fast_free: T#%d Calling __kmp_thread_free for size %d\n", __kmp_gtid_from_thread( this_thr), size ) ); __kmp_bget_dequeue( this_thr ); /* Release any queued buffers */ brel( this_thr, descr->ptr_allocated ); end: KE_TRACE( 25, ( "<- __kmp_fast_free() returns\n" ) ); } // func __kmp_fast_free // Initialize the thread free lists related to fast memory // Only do this when a thread is initially created. void __kmp_initialize_fast_memory( kmp_info_t *this_thr ) { KE_TRACE(10, ( "__kmp_initialize_fast_memory: Called from th %p\n", this_thr ) ); memset ( this_thr->th.th_free_lists, 0, NUM_LISTS * sizeof( kmp_free_list_t ) ); } // Free the memory in the thread free lists related to fast memory // Only do this when a thread is being reaped (destroyed). void __kmp_free_fast_memory( kmp_info_t *th ) { // Suppose we use BGET underlying allocator, walk through its structures... int bin; thr_data_t * thr = get_thr_data( th ); void ** lst = NULL; KE_TRACE(5, ( "__kmp_free_fast_memory: Called T#%d\n", __kmp_gtid_from_thread( th ) ) ); __kmp_bget_dequeue( th ); // Release any queued buffers // Dig through free lists and extract all allocated blocks for ( bin = 0; bin < MAX_BGET_BINS; ++bin ) { bfhead_t * b = thr->freelist[ bin ].ql.flink; while ( b != &thr->freelist[ bin ] ) { if ( (kmp_uintptr_t)b->bh.bb.bthr & 1 ) { // if the buffer is an allocated address? *((void**)b) = lst; // link the list (override bthr, but keep flink yet) lst = (void**)b; // push b into lst } b = b->ql.flink; // get next buffer } } while ( lst != NULL ) { void * next = *lst; KE_TRACE(10, ( "__kmp_free_fast_memory: freeing %p, next=%p th %p (%d)\n", lst, next, th, __kmp_gtid_from_thread( th ) ) ); (*thr->relfcn)(lst); #if BufStats // count blocks to prevent problems in __kmp_finalize_bget() thr->numprel++; /* Nr of expansion block releases */ thr->numpblk--; /* Total number of blocks */ #endif lst = (void**)next; } KE_TRACE(5, ( "__kmp_free_fast_memory: Freed T#%d\n", __kmp_gtid_from_thread( th ) ) ); } #endif // USE_FAST_MEMORY