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
pthread_create_once(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
pthread_create(pthread_t * __restrict thread,const pthread_attr_t * __restrict attr,void * (* start_routine)(void *),void * __restrict arg)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
malloc_mutex_init(malloc_mutex_t * mutex,const char * name,witness_rank_t rank)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
malloc_mutex_prefork(tsdn_t * tsdn,malloc_mutex_t * mutex)114 malloc_mutex_prefork(tsdn_t *tsdn, malloc_mutex_t *mutex)
115 {
116
117 malloc_mutex_lock(tsdn, mutex);
118 }
119
120 void
malloc_mutex_postfork_parent(tsdn_t * tsdn,malloc_mutex_t * mutex)121 malloc_mutex_postfork_parent(tsdn_t *tsdn, malloc_mutex_t *mutex)
122 {
123
124 malloc_mutex_unlock(tsdn, mutex);
125 }
126
127 void
malloc_mutex_postfork_child(tsdn_t * tsdn,malloc_mutex_t * mutex)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
malloc_mutex_boot(void)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