1 /* Copyright (c) 2015, Google Inc.
2 *
3 * Permission to use, copy, modify, and/or distribute this software for any
4 * purpose with or without fee is hereby granted, provided that the above
5 * copyright notice and this permission notice appear in all copies.
6 *
7 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
8 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
9 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
10 * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
11 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION
12 * OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
13 * CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */
14
15 #include "internal.h"
16
17 #if !defined(OPENSSL_WINDOWS) && !defined(OPENSSL_NO_THREADS)
18
19 #include <pthread.h>
20 #include <stdlib.h>
21 #include <string.h>
22
23 #include <openssl/mem.h>
24 #include <openssl/type_check.h>
25
26
27 OPENSSL_COMPILE_ASSERT(sizeof(CRYPTO_MUTEX) >= sizeof(pthread_rwlock_t),
28 CRYPTO_MUTEX_too_small);
29
CRYPTO_MUTEX_init(CRYPTO_MUTEX * lock)30 void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock) {
31 if (pthread_rwlock_init((pthread_rwlock_t *) lock, NULL) != 0) {
32 abort();
33 }
34 }
35
CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX * lock)36 void CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX *lock) {
37 if (pthread_rwlock_rdlock((pthread_rwlock_t *) lock) != 0) {
38 abort();
39 }
40 }
41
CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX * lock)42 void CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX *lock) {
43 if (pthread_rwlock_wrlock((pthread_rwlock_t *) lock) != 0) {
44 abort();
45 }
46 }
47
CRYPTO_MUTEX_unlock(CRYPTO_MUTEX * lock)48 void CRYPTO_MUTEX_unlock(CRYPTO_MUTEX *lock) {
49 if (pthread_rwlock_unlock((pthread_rwlock_t *) lock) != 0) {
50 abort();
51 }
52 }
53
CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX * lock)54 void CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX *lock) {
55 pthread_rwlock_destroy((pthread_rwlock_t *) lock);
56 }
57
CRYPTO_STATIC_MUTEX_lock_read(struct CRYPTO_STATIC_MUTEX * lock)58 void CRYPTO_STATIC_MUTEX_lock_read(struct CRYPTO_STATIC_MUTEX *lock) {
59 if (pthread_rwlock_rdlock(&lock->lock) != 0) {
60 abort();
61 }
62 }
63
CRYPTO_STATIC_MUTEX_lock_write(struct CRYPTO_STATIC_MUTEX * lock)64 void CRYPTO_STATIC_MUTEX_lock_write(struct CRYPTO_STATIC_MUTEX *lock) {
65 if (pthread_rwlock_wrlock(&lock->lock) != 0) {
66 abort();
67 }
68 }
69
CRYPTO_STATIC_MUTEX_unlock(struct CRYPTO_STATIC_MUTEX * lock)70 void CRYPTO_STATIC_MUTEX_unlock(struct CRYPTO_STATIC_MUTEX *lock) {
71 if (pthread_rwlock_unlock(&lock->lock) != 0) {
72 abort();
73 }
74 }
75
CRYPTO_once(CRYPTO_once_t * once,void (* init)(void))76 void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void)) {
77 pthread_once(once, init);
78 }
79
80 static pthread_mutex_t g_destructors_lock = PTHREAD_MUTEX_INITIALIZER;
81 static thread_local_destructor_t g_destructors[NUM_OPENSSL_THREAD_LOCALS];
82
thread_local_destructor(void * arg)83 static void thread_local_destructor(void *arg) {
84 if (arg == NULL) {
85 return;
86 }
87
88 thread_local_destructor_t destructors[NUM_OPENSSL_THREAD_LOCALS];
89 if (pthread_mutex_lock(&g_destructors_lock) != 0) {
90 return;
91 }
92 memcpy(destructors, g_destructors, sizeof(destructors));
93 pthread_mutex_unlock(&g_destructors_lock);
94
95 unsigned i;
96 void **pointers = arg;
97 for (i = 0; i < NUM_OPENSSL_THREAD_LOCALS; i++) {
98 if (destructors[i] != NULL) {
99 destructors[i](pointers[i]);
100 }
101 }
102
103 OPENSSL_free(pointers);
104 }
105
106 static pthread_once_t g_thread_local_init_once = PTHREAD_ONCE_INIT;
107 static pthread_key_t g_thread_local_key;
108 static int g_thread_local_failed = 0;
109
thread_local_init(void)110 static void thread_local_init(void) {
111 g_thread_local_failed =
112 pthread_key_create(&g_thread_local_key, thread_local_destructor) != 0;
113 }
114
CRYPTO_get_thread_local(thread_local_data_t index)115 void *CRYPTO_get_thread_local(thread_local_data_t index) {
116 CRYPTO_once(&g_thread_local_init_once, thread_local_init);
117 if (g_thread_local_failed) {
118 return NULL;
119 }
120
121 void **pointers = pthread_getspecific(g_thread_local_key);
122 if (pointers == NULL) {
123 return NULL;
124 }
125 return pointers[index];
126 }
127
CRYPTO_set_thread_local(thread_local_data_t index,void * value,thread_local_destructor_t destructor)128 int CRYPTO_set_thread_local(thread_local_data_t index, void *value,
129 thread_local_destructor_t destructor) {
130 CRYPTO_once(&g_thread_local_init_once, thread_local_init);
131 if (g_thread_local_failed) {
132 destructor(value);
133 return 0;
134 }
135
136 void **pointers = pthread_getspecific(g_thread_local_key);
137 if (pointers == NULL) {
138 pointers = OPENSSL_malloc(sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
139 if (pointers == NULL) {
140 destructor(value);
141 return 0;
142 }
143 memset(pointers, 0, sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
144 if (pthread_setspecific(g_thread_local_key, pointers) != 0) {
145 OPENSSL_free(pointers);
146 destructor(value);
147 return 0;
148 }
149 }
150
151 if (pthread_mutex_lock(&g_destructors_lock) != 0) {
152 destructor(value);
153 return 0;
154 }
155 g_destructors[index] = destructor;
156 pthread_mutex_unlock(&g_destructors_lock);
157
158 pointers[index] = value;
159 return 1;
160 }
161
162 #endif /* !OPENSSL_WINDOWS && !OPENSSL_NO_THREADS */
163