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, const char *name, witness_rank_t rank) 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_OS_UNFAIR_LOCK)) 84 mutex->lock = OS_UNFAIR_LOCK_INIT; 85 #elif (defined(JEMALLOC_OSSPIN)) 86 mutex->lock = 0; 87 #elif (defined(JEMALLOC_MUTEX_INIT_CB)) 88 if (postpone_init) { 89 mutex->postponed_next = postponed_mutexes; 90 postponed_mutexes = mutex; 91 } else { 92 if (_pthread_mutex_init_calloc_cb(&mutex->lock, 93 bootstrap_calloc) != 0) 94 return (true); 95 } 96 #else 97 pthread_mutexattr_t attr; 98 99 if (pthread_mutexattr_init(&attr) != 0) 100 return (true); 101 pthread_mutexattr_settype(&attr, MALLOC_MUTEX_TYPE); 102 if (pthread_mutex_init(&mutex->lock, &attr) != 0) { 103 pthread_mutexattr_destroy(&attr); 104 return (true); 105 } 106 pthread_mutexattr_destroy(&attr); 107 #endif 108 if (config_debug) 109 witness_init(&mutex->witness, name, rank, NULL); 110 return (false); 111 } 112 113 void 114 malloc_mutex_prefork(tsdn_t *tsdn, malloc_mutex_t *mutex) 115 { 116 117 malloc_mutex_lock(tsdn, mutex); 118 } 119 120 void 121 malloc_mutex_postfork_parent(tsdn_t *tsdn, malloc_mutex_t *mutex) 122 { 123 124 malloc_mutex_unlock(tsdn, mutex); 125 } 126 127 void 128 malloc_mutex_postfork_child(tsdn_t *tsdn, malloc_mutex_t *mutex) 129 { 130 131 #ifdef JEMALLOC_MUTEX_INIT_CB 132 malloc_mutex_unlock(tsdn, mutex); 133 #else 134 if (malloc_mutex_init(mutex, mutex->witness.name, 135 mutex->witness.rank)) { 136 malloc_printf("<jemalloc>: Error re-initializing mutex in " 137 "child\n"); 138 if (opt_abort) 139 abort(); 140 } 141 #endif 142 } 143 144 bool 145 malloc_mutex_boot(void) 146 { 147 148 #ifdef JEMALLOC_MUTEX_INIT_CB 149 postpone_init = false; 150 while (postponed_mutexes != NULL) { 151 if (_pthread_mutex_init_calloc_cb(&postponed_mutexes->lock, 152 bootstrap_calloc) != 0) 153 return (true); 154 postponed_mutexes = postponed_mutexes->postponed_next; 155 } 156 #endif 157 return (false); 158 } 159
