/*
- * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
+ * Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
*
- * Licensed under the OpenSSL license (the "License"). You may not use
+ * Licensed under the Apache License 2.0 (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)
{
- CRYPTO_RWLOCK *lock = OPENSSL_zalloc(sizeof(pthread_rwlock_t));
- if (lock == NULL)
+# 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;
}
if (lock == NULL)
return;
+# ifdef USE_RWLOCK
pthread_rwlock_destroy(lock);
+# else
+ pthread_mutex_destroy(lock);
+# endif
OPENSSL_free(lock);
return;
int CRYPTO_atomic_add(int *val, int amount, int *ret, CRYPTO_RWLOCK *lock)
{
-# if defined(__GNUC__) && defined(__ATOMIC_RELAXED)
- *ret = __atomic_add_fetch(val, amount, __ATOMIC_RELAXED);
-# else
+# 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;
if (!CRYPTO_THREAD_unlock(lock))
return 0;
-# endif
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