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