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