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 70 #pragma weak _pthread_mutex_init_calloc_cb 71 int 72 _pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex, 73 void *(calloc_cb)(size_t, size_t)) 74 { 75 76 return (((int (*)(pthread_mutex_t *, void *(*)(size_t, size_t))) 77 __libc_interposing[INTERPOS__pthread_mutex_init_calloc_cb])(mutex, 78 calloc_cb)); 79 } 80 #endif 81 82 bool 83 malloc_mutex_init(malloc_mutex_t *mutex, const char *name, witness_rank_t rank) 84 { 85 86 #ifdef _WIN32 87 # if _WIN32_WINNT >= 0x0600 88 InitializeSRWLock(&mutex->lock); 89 # else 90 if (!InitializeCriticalSectionAndSpinCount(&mutex->lock, 91 _CRT_SPINCOUNT)) 92 return (true); 93 # endif 94 #elif (defined(JEMALLOC_OSSPIN)) 95 mutex->lock = 0; 96 #elif (defined(JEMALLOC_MUTEX_INIT_CB)) 97 if (postpone_init) { 98 mutex->postponed_next = postponed_mutexes; 99 postponed_mutexes = mutex; 100 } else { 101 if (_pthread_mutex_init_calloc_cb(&mutex->lock, 102 bootstrap_calloc) != 0) 103 return (true); 104 } 105 #else 106 pthread_mutexattr_t attr; 107 108 if (pthread_mutexattr_init(&attr) != 0) 109 return (true); 110 pthread_mutexattr_settype(&attr, MALLOC_MUTEX_TYPE); 111 if (pthread_mutex_init(&mutex->lock, &attr) != 0) { 112 pthread_mutexattr_destroy(&attr); 113 return (true); 114 } 115 pthread_mutexattr_destroy(&attr); 116 #endif 117 if (config_debug) 118 witness_init(&mutex->witness, name, rank, NULL); 119 return (false); 120 } 121 122 void 123 malloc_mutex_prefork(tsdn_t *tsdn, malloc_mutex_t *mutex) 124 { 125 126 malloc_mutex_lock(tsdn, mutex); 127 } 128 129 void 130 malloc_mutex_postfork_parent(tsdn_t *tsdn, malloc_mutex_t *mutex) 131 { 132 133 malloc_mutex_unlock(tsdn, mutex); 134 } 135 136 void 137 malloc_mutex_postfork_child(tsdn_t *tsdn, malloc_mutex_t *mutex) 138 { 139 140 #ifdef JEMALLOC_MUTEX_INIT_CB 141 malloc_mutex_unlock(tsdn, mutex); 142 #else 143 if (malloc_mutex_init(mutex, mutex->witness.name, 144 mutex->witness.rank)) { 145 malloc_printf("<jemalloc>: Error re-initializing mutex in " 146 "child\n"); 147 if (opt_abort) 148 abort(); 149 } 150 #endif 151 } 152 153 bool 154 malloc_mutex_first_thread(void) 155 { 156 157 #ifdef JEMALLOC_MUTEX_INIT_CB 158 postpone_init = false; 159 while (postponed_mutexes != NULL) { 160 if (_pthread_mutex_init_calloc_cb(&postponed_mutexes->lock, 161 bootstrap_calloc) != 0) 162 return (true); 163 postponed_mutexes = postponed_mutexes->postponed_next; 164 } 165 #endif 166 return (false); 167 } 168 169 bool 170 malloc_mutex_boot(void) 171 { 172 173 #ifndef JEMALLOC_MUTEX_INIT_CB 174 return (malloc_mutex_first_thread()); 175 #else 176 return (false); 177 #endif 178 } 179