blob: 72d563bbe78253ea42a3f3ff8619a5288b13bde6 [file] [log] [blame]
// Copyright (c) 2013, the Dart project authors. Please see the AUTHORS file
// for details. All rights reserved. Use of this source code is governed by a
// BSD-style license that can be found in the LICENSE file.
#include "platform/globals.h"
#include "platform/allocation.h"
namespace dart {
class AtomicOperations : public AllStatic {
// Atomically fetch the value at p and increment the value at p.
// Returns the original value at p.
static uintptr_t FetchAndIncrement(uintptr_t* p);
static intptr_t FetchAndIncrement(intptr_t* p);
// Atomically increment the value at p by 'value'.
static void IncrementBy(intptr_t* p, intptr_t value);
static void IncrementInt64By(int64_t* p, int64_t value);
// Atomically fetch the value at p and decrement the value at p.
// Returns the original value at p.
static uintptr_t FetchAndDecrement(uintptr_t* p);
static intptr_t FetchAndDecrement(intptr_t* p);
// Atomically decrement the value at p by 'value'.
static void DecrementBy(intptr_t* p, intptr_t value);
// Atomically perform { tmp = *ptr; *ptr = (tmp OP value); return tmp; }.
static uint32_t FetchOrRelaxedUint32(uint32_t* ptr, uint32_t value);
static uint32_t FetchAndRelaxedUint32(uint32_t* ptr, uint32_t value);
// Atomically compare *ptr to old_value, and if equal, store new_value.
// Returns the original value at ptr.
static uword CompareAndSwapWord(uword* ptr, uword old_value, uword new_value);
static uint32_t CompareAndSwapUint32(uint32_t* ptr,
uint32_t old_value,
uint32_t new_value);
// Performs a load of a word from 'ptr', but without any guarantees about
// memory order (i.e., no load barriers/fences).
template <typename T>
static T LoadRelaxed(T* ptr) {
return *static_cast<volatile T*>(ptr);
template <typename T>
static T LoadAcquire(T* ptr);
template <typename T>
static void StoreRelease(T* ptr, T value);
template <typename T>
static T* CompareAndSwapPointer(T** slot, T* old_value, T* new_value) {
return reinterpret_cast<T*>(AtomicOperations::CompareAndSwapWord(
reinterpret_cast<uword*>(slot), reinterpret_cast<uword>(old_value),
} // namespace dart
#if defined(HOST_OS_ANDROID)
#include "platform/atomic_android.h"
#elif defined(HOST_OS_FUCHSIA)
#include "platform/atomic_fuchsia.h"
#elif defined(HOST_OS_LINUX)
#include "platform/atomic_linux.h"
#elif defined(HOST_OS_MACOS)
#include "platform/atomic_macos.h"
#elif defined(HOST_OS_WINDOWS)
#include "platform/atomic_win.h"
#error Unknown target os.