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