/*
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* Copyright 2011 Google Inc. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef SFNTLY_CPP_SRC_SFNTLY_PORT_ATOMIC_H_
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#define SFNTLY_CPP_SRC_SFNTLY_PORT_ATOMIC_H_
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#if defined (WIN32)
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#include <windows.h>
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static inline size_t AtomicIncrement(size_t* address) {
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#if defined (_WIN64)
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return InterlockedIncrement64(reinterpret_cast<LONGLONG*>(address));
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#else
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return InterlockedIncrement(reinterpret_cast<LONG*>(address));
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#endif
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}
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static inline size_t AtomicDecrement(size_t* address) {
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#if defined (_WIN64)
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return InterlockedDecrement64(reinterpret_cast<LONGLONG*>(address));
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#else
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return InterlockedDecrement(reinterpret_cast<LONG*>(address));
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#endif
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}
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#elif defined (__APPLE__)
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#include <libkern/OSAtomic.h>
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static inline size_t AtomicIncrement(size_t* address) {
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return OSAtomicIncrement32Barrier(reinterpret_cast<int32_t*>(address));
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}
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static inline size_t AtomicDecrement(size_t* address) {
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return OSAtomicDecrement32Barrier(reinterpret_cast<int32_t*>(address));
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}
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// Originally we check __GCC_HAVE_SYNC_COMPARE_AND_SWAP_4, however, there are
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// issues that clang not carring over this definition. Therefore we boldly
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// assume it's gcc or gcc-compatible here. Compilation shall still fail since
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// the intrinsics used are GCC-specific.
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#else
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#include <stddef.h>
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static inline size_t AtomicIncrement(size_t* address) {
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return __sync_add_and_fetch(address, 1);
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}
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static inline size_t AtomicDecrement(size_t* address) {
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return __sync_sub_and_fetch(address, 1);
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}
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#endif // WIN32
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#endif // SFNTLY_CPP_SRC_SFNTLY_PORT_ATOMIC_H_
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