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