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) 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 return (false); 118 } 119 120 void 121 malloc_mutex_prefork(malloc_mutex_t *mutex) 122 { 123 124 malloc_mutex_lock(mutex); 125 } 126 127 void 128 malloc_mutex_postfork_parent(malloc_mutex_t *mutex) 129 { 130 131 malloc_mutex_unlock(mutex); 132 } 133 134 void 135 malloc_mutex_postfork_child(malloc_mutex_t *mutex) 136 { 137 138 #ifdef JEMALLOC_MUTEX_INIT_CB 139 malloc_mutex_unlock(mutex); 140 #else 141 if (malloc_mutex_init(mutex)) { 142 malloc_printf("<jemalloc>: Error re-initializing mutex in " 143 "child\n"); 144 if (opt_abort) 145 abort(); 146 } 147 #endif 148 } 149 150 bool 151 malloc_mutex_first_thread(void) 152 { 153 154 #ifdef JEMALLOC_MUTEX_INIT_CB 155 postpone_init = false; 156 while (postponed_mutexes != NULL) { 157 if (_pthread_mutex_init_calloc_cb(&postponed_mutexes->lock, 158 bootstrap_calloc) != 0) 159 return (true); 160 postponed_mutexes = postponed_mutexes->postponed_next; 161 } 162 #endif 163 return (false); 164 } 165 166 bool 167 mutex_boot(void) 168 { 169 170 #ifndef JEMALLOC_MUTEX_INIT_CB 171 return (malloc_mutex_first_thread()); 172 #else 173 return (false); 174 #endif 175 } 176