Daniel Andersson
e7fb1c8516
Using volatile on a word size location will generate a single move instruction without order guarantees and is supported on all compilers. Replace FetchAndAdd with FetchAndDecrement, since the latter is sufficient and eaiser to implement portably (in particular on some Windows setups). BUG=https://github.com/dart-lang/sdk/issues/24049 R=iposva@google.com Review URL: https://codereview.chromium.org//1287853005 .
40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
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// for details. All rights reserved. Use of this source code is governed by a
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// BSD-style license that can be found in the LICENSE file.
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#ifndef VM_ATOMIC_ANDROID_H_
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#define VM_ATOMIC_ANDROID_H_
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#if !defined VM_ATOMIC_H_
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#error Do not include atomic_android.h directly. Use atomic.h instead.
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#endif
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#if !defined(TARGET_OS_ANDROID)
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#error This file should only be included on Android builds.
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#endif
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namespace dart {
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inline uintptr_t AtomicOperations::FetchAndIncrement(uintptr_t* p) {
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return __sync_fetch_and_add(p, 1);
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}
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inline uintptr_t AtomicOperations::FetchAndDecrement(uintptr_t* p) {
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return __sync_fetch_and_sub(p, 1);
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}
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#if !defined(USING_SIMULATOR)
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inline uword AtomicOperations::CompareAndSwapWord(uword* ptr,
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uword old_value,
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uword new_value) {
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return __sync_val_compare_and_swap(ptr, old_value, new_value);
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}
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#endif // !defined(USING_SIMULATOR)
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} // namespace dart
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#endif // VM_ATOMIC_ANDROID_H_
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