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
16bool isthreaded = false;
17#endif
18#ifdef JEMALLOC_MUTEX_INIT_CB
19static bool		postpone_init = true;
20static malloc_mutex_t	*postponed_mutexes = NULL;
21#endif
22
23#if defined(JEMALLOC_LAZY_LOCK) && !defined(_WIN32)
24static 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)
34static int (*pthread_create_fptr)(pthread_t *__restrict, const pthread_attr_t *,
35    void *(*)(void *), void *__restrict);
36
37static void
38pthread_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
51JEMALLOC_EXPORT int
52pthread_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
67JEMALLOC_EXPORT int	_pthread_mutex_init_calloc_cb(pthread_mutex_t *mutex,
68    void *(calloc_cb)(size_t, size_t));
69#endif
70
71bool
72malloc_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
105void
106malloc_mutex_prefork(malloc_mutex_t *mutex)
107{
108
109	malloc_mutex_lock(mutex);
110}
111
112void
113malloc_mutex_postfork_parent(malloc_mutex_t *mutex)
114{
115
116	malloc_mutex_unlock(mutex);
117}
118
119void
120malloc_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
135bool
136mutex_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