diff options
Diffstat (limited to 'crypto/threads_pthread.c')
| -rw-r--r-- | crypto/threads_pthread.c | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/crypto/threads_pthread.c b/crypto/threads_pthread.c new file mode 100644 index 000000000000..5a59779ebbb1 --- /dev/null +++ b/crypto/threads_pthread.c @@ -0,0 +1,196 @@ +/* + * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved. + * + * Licensed under the OpenSSL license (the "License"). You may not use + * this file except in compliance with the License. You can obtain a copy + * in the file LICENSE in the source distribution or at + * https://www.openssl.org/source/license.html + */ + +#include <openssl/crypto.h> +#include "internal/cryptlib.h" + +#if defined(OPENSSL_THREADS) && !defined(CRYPTO_TDEBUG) && !defined(OPENSSL_SYS_WINDOWS) + +# ifdef PTHREAD_RWLOCK_INITIALIZER +# define USE_RWLOCK +# endif + +CRYPTO_RWLOCK *CRYPTO_THREAD_lock_new(void) +{ +# ifdef USE_RWLOCK + CRYPTO_RWLOCK *lock; + + if ((lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t))) == NULL) { + /* Don't set error, to avoid recursion blowup. */ + return NULL; + } + + if (pthread_rwlock_init(lock, NULL) != 0) { + OPENSSL_free(lock); + return NULL; + } +# else + pthread_mutexattr_t attr; + CRYPTO_RWLOCK *lock; + + if ((lock = OPENSSL_zalloc(sizeof(pthread_mutex_t))) == NULL) { + /* Don't set error, to avoid recursion blowup. */ + return NULL; + } + + pthread_mutexattr_init(&attr); + pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE); + + if (pthread_mutex_init(lock, &attr) != 0) { + pthread_mutexattr_destroy(&attr); + OPENSSL_free(lock); + return NULL; + } + + pthread_mutexattr_destroy(&attr); +# endif + + return lock; +} + +int CRYPTO_THREAD_read_lock(CRYPTO_RWLOCK *lock) +{ +# ifdef USE_RWLOCK + if (pthread_rwlock_rdlock(lock) != 0) + return 0; +# else + if (pthread_mutex_lock(lock) != 0) + return 0; +# endif + + return 1; +} + +int CRYPTO_THREAD_write_lock(CRYPTO_RWLOCK *lock) +{ +# ifdef USE_RWLOCK + if (pthread_rwlock_wrlock(lock) != 0) + return 0; +# else + if (pthread_mutex_lock(lock) != 0) + return 0; +# endif + + return 1; +} + +int CRYPTO_THREAD_unlock(CRYPTO_RWLOCK *lock) +{ +# ifdef USE_RWLOCK + if (pthread_rwlock_unlock(lock) != 0) + return 0; +# else + if (pthread_mutex_unlock(lock) != 0) + return 0; +# endif + + return 1; +} + +void CRYPTO_THREAD_lock_free(CRYPTO_RWLOCK *lock) +{ + if (lock == NULL) + return; + +# ifdef USE_RWLOCK + pthread_rwlock_destroy(lock); +# else + pthread_mutex_destroy(lock); +# endif + OPENSSL_free(lock); + + return; +} + +int CRYPTO_THREAD_run_once(CRYPTO_ONCE *once, void (*init)(void)) +{ + if (pthread_once(once, init) != 0) + return 0; + + return 1; +} + +int CRYPTO_THREAD_init_local(CRYPTO_THREAD_LOCAL *key, void (*cleanup)(void *)) +{ + if (pthread_key_create(key, cleanup) != 0) + return 0; + + return 1; +} + +void *CRYPTO_THREAD_get_local(CRYPTO_THREAD_LOCAL *key) +{ + return pthread_getspecific(*key); +} + +int CRYPTO_THREAD_set_local(CRYPTO_THREAD_LOCAL *key, void *val) +{ + if (pthread_setspecific(*key, val) != 0) + return 0; + + return 1; +} + +int CRYPTO_THREAD_cleanup_local(CRYPTO_THREAD_LOCAL *key) +{ + if (pthread_key_delete(*key) != 0) + return 0; + + return 1; +} + +CRYPTO_THREAD_ID CRYPTO_THREAD_get_current_id(void) +{ + return pthread_self(); +} + +int CRYPTO_THREAD_compare_id(CRYPTO_THREAD_ID a, CRYPTO_THREAD_ID b) +{ + return pthread_equal(a, b); +} + +int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock) +{ +# if defined(__GNUC__) && defined(__ATOMIC_ACQ_REL) + if (__atomic_is_lock_free(sizeof(*val), val)) { + *ret = __atomic_add_fetch(val, amount, __ATOMIC_ACQ_REL); + return 1; + } +# endif + if (!CRYPTO_THREAD_write_lock(lock)) + return 0; + + *val += amount; + *ret = *val; + + if (!CRYPTO_THREAD_unlock(lock)) + return 0; + + return 1; +} + +# ifdef OPENSSL_SYS_UNIX +static pthread_once_t fork_once_control = PTHREAD_ONCE_INIT; + +static void fork_once_func(void) +{ + pthread_atfork(OPENSSL_fork_prepare, + OPENSSL_fork_parent, OPENSSL_fork_child); +} +# endif + +int openssl_init_fork_handlers(void) +{ +# ifdef OPENSSL_SYS_UNIX + if (pthread_once(&fork_once_control, fork_once_func) == 0) + return 1; +# endif + return 0; +} +#endif |