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 #include <stdlib.h> 18 19 #include <openssl/type_check.h> 20 21 22 #if !defined(OPENSSL_C11_ATOMIC) 23 24 OPENSSL_COMPILE_ASSERT((CRYPTO_refcount_t)-1 == CRYPTO_REFCOUNT_MAX, 25 CRYPTO_REFCOUNT_MAX_is_incorrect); 26 27 static struct CRYPTO_STATIC_MUTEX g_refcount_lock = CRYPTO_STATIC_MUTEX_INIT; 28 29 void CRYPTO_refcount_inc(CRYPTO_refcount_t *count) { 30 CRYPTO_STATIC_MUTEX_lock_write(&g_refcount_lock); 31 if (*count < CRYPTO_REFCOUNT_MAX) { 32 (*count)++; 33 } 34 CRYPTO_STATIC_MUTEX_unlock_write(&g_refcount_lock); 35 } 36 37 int CRYPTO_refcount_dec_and_test_zero(CRYPTO_refcount_t *count) { 38 int ret; 39 40 CRYPTO_STATIC_MUTEX_lock_write(&g_refcount_lock); 41 if (*count == 0) { 42 abort(); 43 } 44 if (*count < CRYPTO_REFCOUNT_MAX) { 45 (*count)--; 46 } 47 ret = (*count == 0); 48 CRYPTO_STATIC_MUTEX_unlock_write(&g_refcount_lock); 49 50 return ret; 51 } 52 53 #endif // OPENSSL_C11_ATOMIC 54
