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d9c3190e44
Change-Id: Id304de9618a299a201b946a901a54352772f56fb Reviewed-on: https://dart-review.googlesource.com/48704 Reviewed-by: Siva Annamalai <asiva@google.com> Reviewed-by: Zach Anderson <zra@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>
71 lines
2.4 KiB
C++
71 lines
2.4 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 RUNTIME_PLATFORM_ATOMIC_H_
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#define RUNTIME_PLATFORM_ATOMIC_H_
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#include "platform/globals.h"
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#include "platform/allocation.h"
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namespace dart {
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class AtomicOperations : public AllStatic {
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public:
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// Atomically fetch the value at p and increment the value at p.
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// Returns the original value at p.
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static uintptr_t FetchAndIncrement(uintptr_t* p);
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static intptr_t FetchAndIncrement(intptr_t* p);
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// Atomically increment the value at p by 'value'.
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static void IncrementBy(intptr_t* p, intptr_t value);
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static void IncrementInt64By(int64_t* p, int64_t value);
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// Atomically fetch the value at p and decrement the value at p.
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// Returns the original value at p.
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static uintptr_t FetchAndDecrement(uintptr_t* p);
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static intptr_t FetchAndDecrement(intptr_t* p);
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// Atomically decrement the value at p by 'value'.
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static void DecrementBy(intptr_t* p, intptr_t value);
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// Atomically compare *ptr to old_value, and if equal, store new_value.
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// Returns the original value at ptr.
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static uword CompareAndSwapWord(uword* ptr, uword old_value, uword new_value);
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static uint32_t CompareAndSwapUint32(uint32_t* ptr,
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uint32_t old_value,
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uint32_t new_value);
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// Performs a load of a word from 'ptr', but without any guarantees about
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// memory order (i.e., no load barriers/fences).
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template <typename T>
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static T LoadRelaxed(T* ptr) {
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return *static_cast<volatile T*>(ptr);
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}
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template <typename T>
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static T* CompareAndSwapPointer(T** slot, T* old_value, T* new_value) {
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return reinterpret_cast<T*>(AtomicOperations::CompareAndSwapWord(
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reinterpret_cast<uword*>(slot), reinterpret_cast<uword>(old_value),
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reinterpret_cast<uword>(new_value)));
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}
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};
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} // namespace dart
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#if defined(HOST_OS_ANDROID)
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#include "platform/atomic_android.h"
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#elif defined(HOST_OS_FUCHSIA)
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#include "platform/atomic_fuchsia.h"
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#elif defined(HOST_OS_LINUX)
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#include "platform/atomic_linux.h"
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#elif defined(HOST_OS_MACOS)
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#include "platform/atomic_macos.h"
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#elif defined(HOST_OS_WINDOWS)
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#include "platform/atomic_win.h"
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#else
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#error Unknown target os.
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#endif
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#endif // RUNTIME_PLATFORM_ATOMIC_H_
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