2 * Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the OpenSSL license (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
9 #ifndef HEADER_INTERNAL_REFCOUNT_H
10 # define HEADER_INTERNAL_REFCOUNT_H
12 # if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
13 # include <stdatomic.h>
14 # define HAVE_C11_ATOMICS
17 # if defined(HAVE_C11_ATOMICS) && ATOMIC_INT_LOCK_FREE > 0
19 # define HAVE_ATOMICS 1
21 typedef _Atomic int CRYPTO_REF_COUNT;
23 static ossl_inline int CRYPTO_UP_REF(_Atomic int *val, int *ret, void *lock)
25 *ret = atomic_fetch_add_explicit(val, 1, memory_order_relaxed) + 1;
29 static ossl_inline int CRYPTO_DOWN_REF(_Atomic int *val, int *ret, void *lock)
31 *ret = atomic_fetch_sub_explicit(val, 1, memory_order_release) - 1;
33 atomic_thread_fence(memory_order_acquire);
37 # elif defined(__GNUC__) && defined(__ATOMIC_RELAXED) && __GCC_ATOMIC_INT_LOCK_FREE > 0
39 # define HAVE_ATOMICS 1
41 typedef int CRYPTO_REF_COUNT;
43 static ossl_inline int CRYPTO_UP_REF(int *val, int *ret, void *lock)
45 *ret = __atomic_fetch_add(val, 1, __ATOMIC_RELAXED) + 1;
49 static ossl_inline int CRYPTO_DOWN_REF(int *val, int *ret, void *lock)
51 *ret = __atomic_fetch_sub(val, 1, __ATOMIC_RELEASE) - 1;
53 __atomic_thread_fence(__ATOMIC_ACQUIRE);
59 typedef int CRYPTO_REF_COUNT;
61 # define CRYPTO_UP_REF(val, ret, lock) CRYPTO_atomic_add(val, 1, ret, lock)
62 # define CRYPTO_DOWN_REF(val, ret, lock) CRYPTO_atomic_add(val, -1, ret, lock)