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 // Ensure we can't call OPENSSL_malloc circularly.
16 #define _BORINGSSL_PROHIBIT_OPENSSL_MALLOC
17 #include "internal.h"
18
19 #if defined(OPENSSL_PTHREADS)
20
21 #include <assert.h>
22 #include <pthread.h>
23 #include <stdlib.h>
24 #include <string.h>
25
CRYPTO_MUTEX_init(CRYPTO_MUTEX * lock)26 void CRYPTO_MUTEX_init(CRYPTO_MUTEX *lock) {
27 if (pthread_rwlock_init(lock, NULL) != 0) {
28 abort();
29 }
30 }
31
CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX * lock)32 void CRYPTO_MUTEX_lock_read(CRYPTO_MUTEX *lock) {
33 if (pthread_rwlock_rdlock(lock) != 0) {
34 abort();
35 }
36 }
37
CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX * lock)38 void CRYPTO_MUTEX_lock_write(CRYPTO_MUTEX *lock) {
39 if (pthread_rwlock_wrlock(lock) != 0) {
40 abort();
41 }
42 }
43
CRYPTO_MUTEX_unlock_read(CRYPTO_MUTEX * lock)44 void CRYPTO_MUTEX_unlock_read(CRYPTO_MUTEX *lock) {
45 if (pthread_rwlock_unlock(lock) != 0) {
46 abort();
47 }
48 }
49
CRYPTO_MUTEX_unlock_write(CRYPTO_MUTEX * lock)50 void CRYPTO_MUTEX_unlock_write(CRYPTO_MUTEX *lock) {
51 if (pthread_rwlock_unlock(lock) != 0) {
52 abort();
53 }
54 }
55
CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX * lock)56 void CRYPTO_MUTEX_cleanup(CRYPTO_MUTEX *lock) {
57 pthread_rwlock_destroy(lock);
58 }
59
CRYPTO_once(CRYPTO_once_t * once,void (* init)(void))60 void CRYPTO_once(CRYPTO_once_t *once, void (*init)(void)) {
61 if (pthread_once(once, init) != 0) {
62 abort();
63 }
64 }
65
66 static pthread_mutex_t g_destructors_lock = PTHREAD_MUTEX_INITIALIZER;
67 static thread_local_destructor_t g_destructors[NUM_OPENSSL_THREAD_LOCALS];
68
69 // thread_local_destructor is called when a thread exits. It releases thread
70 // local data for that thread only.
thread_local_destructor(void * arg)71 static void thread_local_destructor(void *arg) {
72 if (arg == NULL) {
73 return;
74 }
75
76 thread_local_destructor_t destructors[NUM_OPENSSL_THREAD_LOCALS];
77 if (pthread_mutex_lock(&g_destructors_lock) != 0) {
78 return;
79 }
80 OPENSSL_memcpy(destructors, g_destructors, sizeof(destructors));
81 pthread_mutex_unlock(&g_destructors_lock);
82
83 unsigned i;
84 void **pointers = arg;
85 for (i = 0; i < NUM_OPENSSL_THREAD_LOCALS; i++) {
86 if (destructors[i] != NULL) {
87 destructors[i](pointers[i]);
88 }
89 }
90
91 free(pointers);
92 }
93
94 static pthread_once_t g_thread_local_init_once = PTHREAD_ONCE_INIT;
95 static pthread_key_t g_thread_local_key;
96 static int g_thread_local_key_created = 0;
97
thread_local_init(void)98 static void thread_local_init(void) {
99 g_thread_local_key_created =
100 pthread_key_create(&g_thread_local_key, thread_local_destructor) == 0;
101 }
102
CRYPTO_get_thread_local(thread_local_data_t index)103 void *CRYPTO_get_thread_local(thread_local_data_t index) {
104 CRYPTO_once(&g_thread_local_init_once, thread_local_init);
105 if (!g_thread_local_key_created) {
106 return NULL;
107 }
108
109 void **pointers = pthread_getspecific(g_thread_local_key);
110 if (pointers == NULL) {
111 return NULL;
112 }
113 return pointers[index];
114 }
115
CRYPTO_set_thread_local(thread_local_data_t index,void * value,thread_local_destructor_t destructor)116 int CRYPTO_set_thread_local(thread_local_data_t index, void *value,
117 thread_local_destructor_t destructor) {
118 CRYPTO_once(&g_thread_local_init_once, thread_local_init);
119 if (!g_thread_local_key_created) {
120 destructor(value);
121 return 0;
122 }
123
124 void **pointers = pthread_getspecific(g_thread_local_key);
125 if (pointers == NULL) {
126 pointers = malloc(sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
127 if (pointers == NULL) {
128 destructor(value);
129 return 0;
130 }
131 OPENSSL_memset(pointers, 0, sizeof(void *) * NUM_OPENSSL_THREAD_LOCALS);
132 if (pthread_setspecific(g_thread_local_key, pointers) != 0) {
133 free(pointers);
134 destructor(value);
135 return 0;
136 }
137 }
138
139 if (pthread_mutex_lock(&g_destructors_lock) != 0) {
140 destructor(value);
141 return 0;
142 }
143 g_destructors[index] = destructor;
144 pthread_mutex_unlock(&g_destructors_lock);
145
146 pointers[index] = value;
147 return 1;
148 }
149
150 #endif // OPENSSL_PTHREADS
151