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/*
* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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
*/
#ifndef HEADER_INTERNAL_REFCOUNT_H
# define HEADER_INTERNAL_REFCOUNT_H
# if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
# include <stdatomic.h>
# define HAVE_C11_ATOMICS
# endif
# if defined(HAVE_C11_ATOMICS) && ATOMIC_INT_LOCK_FREE > 0
# define HAVE_ATOMICS 1
typedef _Atomic int CRYPTO_REF_COUNT;
static ossl_inline int CRYPTO_UP_REF(_Atomic int *val, int *ret, void *lock)
{
*ret = atomic_fetch_add_explicit(val, 1, memory_order_relaxed) + 1;
return 1;
}
static ossl_inline int CRYPTO_DOWN_REF(_Atomic int *val, int *ret, void *lock)
{
*ret = atomic_fetch_sub_explicit(val, 1, memory_order_release) - 1;
if (*ret == 0)
atomic_thread_fence(memory_order_acquire);
return 1;
}
# elif defined(__GNUC__) && defined(__ATOMIC_RELAXED) && __GCC_ATOMIC_INT_LOCK_FREE > 0
# define HAVE_ATOMICS 1
typedef int CRYPTO_REF_COUNT;
static ossl_inline int CRYPTO_UP_REF(int *val, int *ret, void *lock)
{
*ret = __atomic_fetch_add(val, 1, __ATOMIC_RELAXED) + 1;
return 1;
}
static ossl_inline int CRYPTO_DOWN_REF(int *val, int *ret, void *lock)
{
*ret = __atomic_fetch_sub(val, 1, __ATOMIC_RELEASE) - 1;
if (*ret == 0)
__atomic_thread_fence(__ATOMIC_ACQUIRE);
return 1;
}
# else
typedef int CRYPTO_REF_COUNT;
# define CRYPTO_UP_REF(val, ret, lock) CRYPTO_atomic_add(val, 1, ret, lock)
# define CRYPTO_DOWN_REF(val, ret, lock) CRYPTO_atomic_add(val, -1, ret, lock)
# endif
#endif
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