1 #define JEMALLOC_MUTEX_C_ 2 #include "jemalloc/internal/jemalloc_internal.h" 3 4 #if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32) 5 #include <dlfcn.h> 6 #endif 7 8 #ifndef _CRT_SPINCOUNT 9 #define _CRT_SPINCOUNT 4000 10 #endif 11 12 /******************************************************************************/ 13 /* Data. */ 14 15 #ifdef JEMALLOC_LAZY_LOCK 16 bool isthreaded = false; 17 #endif 18 #ifdef JEMALLOC_MUTEX_INIT_CB 19 static bool postpone_init = true; 20 static malloc_mutex_t *postponed_mutexes = NULL; 21 #endif 22 23 #if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32) 24 static void pthread_create_once(void); 25 #endif 26 27 /******************************************************************************/ 28 /* 29 * We intercept pthread_create() calls in order to toggle isthreaded if the 30 * process goes multi-threaded. 31 */ 32 33 #if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32) 34 static int (*pthread_create_fptr)(pthread_t *__restrict, const pthread_attr_t *, 35 void *(*)(void *), void *__restrict); 36 37 static void 38 pthread_create_once(void) 39 { 40 41 pthread_create_fptr = dlsym(RTLD_NEXT, "pthread_create"); 42 if (pthread_create_fptr == NULL) { 43 malloc_write("<jemalloc>: Error in dlsym(RTLD_NEXT, " 44 "\"pthread_create\")\n"); 45 abort(); 46 } 47 48 isthreaded = true; 49 } 50 51 JEMALLOC_EXPORT int 52 pthread_create(pthread_t *__restrict thread, 53 const pthread_attr_t *__restrict attr, void *(*start_routine)(void *), 54 void *__restrict arg) 55 { 56 static pthread_once_t once_control = PTHREAD_ONCE_INIT; 57 58 pthread_once(&once_control, pthread_create_once); 59 60 return (pthread_create_fptr(thread, attr, start_routine, arg)); 61 } 62 #endif 63 64 /******************************************************************************/ 65 66 #ifdef JEMALLOC_MUTEX_INIT_CB 67 JEMALLOC_EXPORT int _pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex, 68 void *(calloc_cb)(size_t, size_t)); 69 #endif 70 71 bool 72 malloc_mutex_init(malloc_mutex_t *mutex) 73 { 74 75 #ifdef _WIN32 76 # if _WIN32_WINNT >= 0x0600 77 InitializeSRWLock(&mutex->lock); 78 # else 79 if (!InitializeCriticalSectionAndSpinCount(&mutex->lock, 80 _CRT_SPINCOUNT)) 81 return (true); 82 # endif 83 #elif (defined(JEMALLOC_OSSPIN)) 84 mutex->lock = 0; 85 #elif (defined(JEMALLOC_MUTEX_INIT_CB)) 86 if (postpone_init) { 87 mutex->postponed_next = postponed_mutexes; 88 postponed_mutexes = mutex; 89 } else { 90 if (_pthread_mutex_init_calloc_cb(&mutex->lock, 91 bootstrap_calloc) != 0) 92 return (true); 93 } 94 #else 95 pthread_mutexattr_t attr; 96 97 if (pthread_mutexattr_init(&attr) != 0) 98 return (true); 99 pthread_mutexattr_settype(&attr, MALLOC_MUTEX_TYPE); 100 if (pthread_mutex_init(&mutex->lock, &attr) != 0) { 101 pthread_mutexattr_destroy(&attr); 102 return (true); 103 } 104 pthread_mutexattr_destroy(&attr); 105 #endif 106 return (false); 107 } 108 109 void 110 malloc_mutex_prefork(malloc_mutex_t *mutex) 111 { 112 113 malloc_mutex_lock(mutex); 114 } 115 116 void 117 malloc_mutex_postfork_parent(malloc_mutex_t *mutex) 118 { 119 120 malloc_mutex_unlock(mutex); 121 } 122 123 void 124 malloc_mutex_postfork_child(malloc_mutex_t *mutex) 125 { 126 127 #ifdef JEMALLOC_MUTEX_INIT_CB 128 malloc_mutex_unlock(mutex); 129 #else 130 if (malloc_mutex_init(mutex)) { 131 malloc_printf("<jemalloc>: Error re-initializing mutex in " 132 "child\n"); 133 if (opt_abort) 134 abort(); 135 } 136 #endif 137 } 138 139 bool 140 mutex_boot(void) 141 { 142 143 #ifdef JEMALLOC_MUTEX_INIT_CB 144 postpone_init = false; 145 while (postponed_mutexes != NULL) { 146 if (_pthread_mutex_init_calloc_cb(&postponed_mutexes->lock, 147 bootstrap_calloc) != 0) 148 return (true); 149 postponed_mutexes = postponed_mutexes->postponed_next; 150 } 151 #endif 152 return (false); 153 } 154