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)72 malloc_mutex_init(malloc_mutex_t *mutex)
73 {
74
75 #ifdef _WIN32
76 if (!InitializeCriticalSectionAndSpinCount(&mutex->lock,
77 _CRT_SPINCOUNT))
78 return (true);
79 #elif (defined(JEMALLOC_OSSPIN))
80 mutex->lock = 0;
81 #elif (defined(JEMALLOC_MUTEX_INIT_CB))
82 if (postpone_init) {
83 mutex->postponed_next = postponed_mutexes;
84 postponed_mutexes = mutex;
85 } else {
86 if (_pthread_mutex_init_calloc_cb(&mutex->lock, base_calloc) !=
87 0)
88 return (true);
89 }
90 #else
91 pthread_mutexattr_t attr;
92
93 if (pthread_mutexattr_init(&attr) != 0)
94 return (true);
95 pthread_mutexattr_settype(&attr, MALLOC_MUTEX_TYPE);
96 if (pthread_mutex_init(&mutex->lock, &attr) != 0) {
97 pthread_mutexattr_destroy(&attr);
98 return (true);
99 }
100 pthread_mutexattr_destroy(&attr);
101 #endif
102 return (false);
103 }
104
105 void
malloc_mutex_prefork(malloc_mutex_t * mutex)106 malloc_mutex_prefork(malloc_mutex_t *mutex)
107 {
108
109 malloc_mutex_lock(mutex);
110 }
111
112 void
malloc_mutex_postfork_parent(malloc_mutex_t * mutex)113 malloc_mutex_postfork_parent(malloc_mutex_t *mutex)
114 {
115
116 malloc_mutex_unlock(mutex);
117 }
118
119 void
malloc_mutex_postfork_child(malloc_mutex_t * mutex)120 malloc_mutex_postfork_child(malloc_mutex_t *mutex)
121 {
122
123 #ifdef JEMALLOC_MUTEX_INIT_CB
124 malloc_mutex_unlock(mutex);
125 #else
126 if (malloc_mutex_init(mutex)) {
127 malloc_printf("<jemalloc>: Error re-initializing mutex in "
128 "child\n");
129 if (opt_abort)
130 abort();
131 }
132 #endif
133 }
134
135 bool
mutex_boot(void)136 mutex_boot(void)
137 {
138
139 #ifdef JEMALLOC_MUTEX_INIT_CB
140 postpone_init = false;
141 while (postponed_mutexes != NULL) {
142 if (_pthread_mutex_init_calloc_cb(&postponed_mutexes->lock,
143 base_calloc) != 0)
144 return (true);
145 postponed_mutexes = postponed_mutexes->postponed_next;
146 }
147 #endif
148 return (false);
149 }
150