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2f545ae45d
Reviewed-by: Andy Polyakov <appro@openssl.org> Reviewed-by: Rich Salz <rsalz@openssl.org> GH: #1500
66 lines
1.7 KiB
C
66 lines
1.7 KiB
C
/*
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* Copyright 2016 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the OpenSSL license (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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#ifndef HEADER_INTERNAL_REFCOUNT_H
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# define HEADER_INTERNAL_REFCOUNT_H
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# if __STDC_VERSION__ >= 201112L && !defined(__STDC_NO_ATOMICS__)
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# include <stdatomic.h>
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# define HAVE_C11_ATOMICS
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# endif
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# if defined(HAVE_C11_ATOMICS) && ATOMIC_INT_LOCK_FREE > 0
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# define HAVE_ATOMICS 1
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typedef _Atomic int CRYPTO_REF_COUNT;
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static ossl_inline int CRYPTO_UP_REF(_Atomic int *val, int *ret, void *lock)
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{
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*ret = atomic_fetch_add_explicit(val, 1, memory_order_relaxed) + 1;
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return 1;
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}
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static ossl_inline int CRYPTO_DOWN_REF(_Atomic int *val, int *ret, void *lock)
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{
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*ret = atomic_fetch_sub_explicit(val, 1, memory_order_release) - 1;
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if (*ret == 0)
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atomic_thread_fence(memory_order_acquire);
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return 1;
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}
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# elif defined(__GNUC__) && defined(__ATOMIC_RELAXED) && __GCC_ATOMIC_INT_LOCK_FREE > 0
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# define HAVE_ATOMICS 1
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typedef int CRYPTO_REF_COUNT;
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static ossl_inline int CRYPTO_UP_REF(int *val, int *ret, void *lock)
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{
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*ret = __atomic_fetch_add(val, 1, __ATOMIC_RELAXED) + 1;
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return 1;
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}
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static ossl_inline int CRYPTO_DOWN_REF(int *val, int *ret, void *lock)
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{
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*ret = __atomic_fetch_sub(val, 1, __ATOMIC_RELEASE) - 1;
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if (*ret == 0)
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__atomic_thread_fence(__ATOMIC_ACQUIRE);
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return 1;
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}
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# else
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typedef int CRYPTO_REF_COUNT;
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# define CRYPTO_UP_REF(val, ret, lock) CRYPTO_atomic_add(val, 1, ret, lock)
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# define CRYPTO_DOWN_REF(val, ret, lock) CRYPTO_atomic_add(val, -1, ret, lock)
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# endif
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#endif
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