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 <stdio.h>
21 #include <stdlib.h>
22 #include <string.h>
23
24 #include <openssl/mem.h>
25 #include <openssl/type_check.h>
26
27
28 OPENSSL_COMPILE_ASSERT(sizeof(CRYPTO_MUTEX) >= sizeof(pthread_rwlock_t),
29 CRYPTO_MUTEX_too_small);
30
CRYPTO_MUTEX_init(CRYPTO_MUTEX * lock)31 void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock) {
32 if (pthread_rwlock_init((pthread_rwlock_t *) lock, NULL) != 0) {
33 abort();
34 }
35 }
36
CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX * lock)37 void CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX *lock) {
38 if (pthread_rwlock_rdlock((pthread_rwlock_t *) lock) != 0) {
39 abort();
40 }
41 }
42
CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX * lock)43 void CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX *lock) {
44 if (pthread_rwlock_wrlock((pthread_rwlock_t *) lock) != 0) {
45 abort();
46 }
47 }
48
CRYPTO_MUTEX_unlock(CRYPTO_MUTEX * lock)49 void CRYPTO_MUTEX_unlock(CRYPTO_MUTEX *lock) {
50 if (pthread_rwlock_unlock((pthread_rwlock_t *) lock) != 0) {
51 abort();
52 }
53 }
54
CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX * lock)55 void CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX *lock) {
56 pthread_rwlock_destroy((pthread_rwlock_t *) lock);
57 }
58
CRYPTO_STATIC_MUTEX_lock_read(struct CRYPTO_STATIC_MUTEX * lock)59 void CRYPTO_STATIC_MUTEX_lock_read(struct CRYPTO_STATIC_MUTEX *lock) {
60 if (pthread_rwlock_rdlock(&lock->lock) != 0) {
61 abort();
62 }
63 }
64
CRYPTO_STATIC_MUTEX_lock_write(struct CRYPTO_STATIC_MUTEX * lock)65 void CRYPTO_STATIC_MUTEX_lock_write(struct CRYPTO_STATIC_MUTEX *lock) {
66 if (pthread_rwlock_wrlock(&lock->lock) != 0) {
67 abort();
68 }
69 }
70
CRYPTO_STATIC_MUTEX_unlock(struct CRYPTO_STATIC_MUTEX * lock)71 void CRYPTO_STATIC_MUTEX_unlock(struct CRYPTO_STATIC_MUTEX *lock) {
72 if (pthread_rwlock_unlock(&lock->lock) != 0) {
73 abort();
74 }
75 }
76
CRYPTO_once(CRYPTO_once_t * once,void (* init)(void))77 void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void)) {
78 if (pthread_once(once, init) != 0) {
79 fprintf(stderr,
80 "pthread_once failed. Did you link against a threading library?\n");
81 abort();
82 }
83 }
84
85 static pthread_mutex_t g_destructors_lock = PTHREAD_MUTEX_INITIALIZER;
86 static thread_local_destructor_t g_destructors[NUM_OPENSSL_THREAD_LOCALS];
87
thread_local_destructor(void * arg)88 static void thread_local_destructor(void *arg) {
89 if (arg == NULL) {
90 return;
91 }
92
93 thread_local_destructor_t destructors[NUM_OPENSSL_THREAD_LOCALS];
94 if (pthread_mutex_lock(&g_destructors_lock) != 0) {
95 return;
96 }
97 memcpy(destructors, g_destructors, sizeof(destructors));
98 pthread_mutex_unlock(&g_destructors_lock);
99
100 unsigned i;
101 void **pointers = arg;
102 for (i = 0; i < NUM_OPENSSL_THREAD_LOCALS; i++) {
103 if (destructors[i] != NULL) {
104 destructors[i](pointers[i]);
105 }
106 }
107
108 OPENSSL_free(pointers);
109 }
110
111 static pthread_once_t g_thread_local_init_once = PTHREAD_ONCE_INIT;
112 static pthread_key_t g_thread_local_key;
113 static int g_thread_local_failed = 0;
114
thread_local_init(void)115 static void thread_local_init(void) {
116 g_thread_local_failed =
117 pthread_key_create(&g_thread_local_key, thread_local_destructor) != 0;
118 }
119
CRYPTO_get_thread_local(thread_local_data_t index)120 void *CRYPTO_get_thread_local(thread_local_data_t index) {
121 CRYPTO_once(&g_thread_local_init_once, thread_local_init);
122 if (g_thread_local_failed) {
123 return NULL;
124 }
125
126 void **pointers = pthread_getspecific(g_thread_local_key);
127 if (pointers == NULL) {
128 return NULL;
129 }
130 return pointers[index];
131 }
132
CRYPTO_set_thread_local(thread_local_data_t index,void * value,thread_local_destructor_t destructor)133 int CRYPTO_set_thread_local(thread_local_data_t index, void *value,
134 thread_local_destructor_t destructor) {
135 CRYPTO_once(&g_thread_local_init_once, thread_local_init);
136 if (g_thread_local_failed) {
137 destructor(value);
138 return 0;
139 }
140
141 void **pointers = pthread_getspecific(g_thread_local_key);
142 if (pointers == NULL) {
143 pointers = OPENSSL_malloc(sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
144 if (pointers == NULL) {
145 destructor(value);
146 return 0;
147 }
148 memset(pointers, 0, sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
149 if (pthread_setspecific(g_thread_local_key, pointers) != 0) {
150 OPENSSL_free(pointers);
151 destructor(value);
152 return 0;
153 }
154 }
155
156 if (pthread_mutex_lock(&g_destructors_lock) != 0) {
157 destructor(value);
158 return 0;
159 }
160 g_destructors[index] = destructor;
161 pthread_mutex_unlock(&g_destructors_lock);
162
163 pointers[index] = value;
164 return 1;
165 }
166
167 #endif /* !OPENSSL_WINDOWS && !OPENSSL_NO_THREADS */
168