Adam Langley | 53b272a | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 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 | |
Robert Sloan | c9abfe4 | 2018-11-26 12:19:07 -0800 | [diff] [blame] | 24 | OPENSSL_STATIC_ASSERT((CRYPTO_refcount_t)-1 == CRYPTO_REFCOUNT_MAX, |
| 25 | "CRYPTO_REFCOUNT_MAX is incorrect"); |
Adam Langley | 53b272a | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 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 | } |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 34 | CRYPTO_STATIC_MUTEX_unlock_write(&g_refcount_lock); |
Adam Langley | 53b272a | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 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); |
David Benjamin | d316cba | 2016-06-02 16:17:39 -0400 | [diff] [blame] | 48 | CRYPTO_STATIC_MUTEX_unlock_write(&g_refcount_lock); |
Adam Langley | 53b272a | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 49 | |
| 50 | return ret; |
| 51 | } |
| 52 | |
Robert Sloan | 8f860b1 | 2017-08-28 07:37:06 -0700 | [diff] [blame] | 53 | #endif // OPENSSL_C11_ATOMIC |