2 * Copyright 2016-2022 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
10 /* We need to use the OPENSSL_fork_*() deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
13 #include <openssl/crypto.h>
14 #include "internal/cryptlib.h"
20 #if defined(__apple_build_version__) && __apple_build_version__ < 6000000
22 * OS/X 10.7 and 10.8 had a weird version of clang which has __ATOMIC_ACQUIRE and
23 * __ATOMIC_ACQ_REL but which expects only one parameter for __atomic_is_lock_free()
24 * rather than two which has signature __atomic_is_lock_free(sizeof(_Atomic(T))).
25 * All of this makes impossible to use __atomic_is_lock_free here.
27 * See: https://github.com/llvm/llvm-project/commit/a4c2602b714e6c6edb98164550a5ae829b2de760
29 #define BROKEN_CLANG_ATOMICS
32 #if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS)
34 # if defined(OPENSSL_SYS_UNIX)
35 # include <sys/types.h>
41 # ifdef PTHREAD_RWLOCK_INITIALIZER
45 CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void)
50 if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) {
51 /* Don't set error, to avoid recursion blowup. */
55 if (pthread_rwlock_init(lock, NULL) != 0) {
60 pthread_mutexattr_t attr;
63 if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) {
64 /* Don't set error, to avoid recursion blowup. */
69 * We don't use recursive mutexes, but try to catch errors if we do.
71 pthread_mutexattr_init(&attr);
72 # if !defined (__TANDEM) && !defined (_SPT_MODEL_)
73 # if !defined(NDEBUG) && !defined(OPENSSL_NO_MUTEX_ERRORCHECK)
74 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_ERRORCHECK);
76 pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_NORMAL);
79 /* The SPT Thread Library does not define MUTEX attributes. */
82 if (pthread_mutex_init(lock, &attr) != 0) {
83 pthread_mutexattr_destroy(&attr);
88 pthread_mutexattr_destroy(&attr);
94 __owur int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock)
97 if (pthread_rwlock_rdlock(lock) != 0)
100 if (pthread_mutex_lock(lock) != 0) {
101 assert(errno != EDEADLK && errno != EBUSY);
109 __owur int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock)
112 if (pthread_rwlock_wrlock(lock) != 0)
115 if (pthread_mutex_lock(lock) != 0) {
116 assert(errno != EDEADLK && errno != EBUSY);
124 int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock)
127 if (pthread_rwlock_unlock(lock) != 0)
130 if (pthread_mutex_unlock(lock) != 0) {
131 assert(errno != EPERM);
139 void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock)
145 pthread_rwlock_destroy(lock);
147 pthread_mutex_destroy(lock);
154 int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void))
156 if (pthread_once(once, init) != 0)
162 int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *))
164 if (pthread_key_create(key, cleanup) != 0)
170 void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key)
172 return pthread_getspecific(*key);
175 int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val)
177 if (pthread_setspecific(*key, val) != 0)
183 int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key)
185 if (pthread_key_delete(*key) != 0)
191 CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void)
193 return pthread_self();
196 int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b)
198 return pthread_equal(a, b);
201 int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
203 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)
204 if (__atomic_is_lock_free(sizeof(*val), val)) {
205 *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL);
208 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
209 /* This will work for all future Solaris versions. */
211 *ret = atomic_add_int_nv((volatile unsigned int *)val, amount);
215 if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))
221 if (!CRYPTO_THREAD_unlock(lock))
227 int CRYPTO_atomic_or(uint64_t *val, uint64_t op, uint64_t *ret,
230 # if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) && !defined(BROKEN_CLANG_ATOMICS)
231 if (__atomic_is_lock_free(sizeof(*val), val)) {
232 *ret = __atomic_or_fetch(val, op, __ATOMIC_ACQ_REL);
235 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
236 /* This will work for all future Solaris versions. */
238 *ret = atomic_or_64_nv(val, op);
242 if (lock == NULL || !CRYPTO_THREAD_write_lock(lock))
247 if (!CRYPTO_THREAD_unlock(lock))
253 int CRYPTO_atomic_load(uint64_t *val, uint64_t *ret, CRYPTO_RWLOCK *lock)
255 # if defined(__GNUC__) && defined(__ATOMIC_ACQUIRE) && !defined(BROKEN_CLANG_ATOMICS)
256 if (__atomic_is_lock_free(sizeof(*val), val)) {
257 __atomic_load(val, ret, __ATOMIC_ACQUIRE);
260 # elif defined(__sun) && (defined(__SunOS_5_10) || defined(__SunOS_5_11))
261 /* This will work for all future Solaris versions. */
263 *ret = atomic_or_64_nv(val, 0);
267 if (lock == NULL || !CRYPTO_THREAD_read_lock(lock))
270 if (!CRYPTO_THREAD_unlock(lock))
276 int openssl_init_fork_handlers(void)
280 # endif /* FIPS_MODULE */
282 int openssl_get_fork_id(void)