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 .
67 lines
2.1 KiB
C++
67 lines
2.1 KiB
C++
// 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.
|
|
|
|
#ifndef VM_ATOMIC_WIN_H_
|
|
#define VM_ATOMIC_WIN_H_
|
|
|
|
#if !defined VM_ATOMIC_H_
|
|
#error Do not include atomic_win.h directly. Use atomic.h instead.
|
|
#endif
|
|
|
|
#if !defined(TARGET_OS_WINDOWS)
|
|
#error This file should only be included on Windows builds.
|
|
#endif
|
|
|
|
namespace dart {
|
|
|
|
inline uintptr_t AtomicOperations::FetchAndIncrement(uintptr_t* p) {
|
|
#if defined(HOST_ARCH_X64)
|
|
return static_cast<uintptr_t>(
|
|
InterlockedIncrement64(reinterpret_cast<LONGLONG*>(p))) - 1;
|
|
#elif defined(HOST_ARCH_IA32)
|
|
return static_cast<uintptr_t>(
|
|
InterlockedIncrement(reinterpret_cast<LONG*>(p))) - 1;
|
|
#else
|
|
#error Unsupported host architecture.
|
|
#endif
|
|
}
|
|
|
|
|
|
inline uintptr_t AtomicOperations::FetchAndDecrement(uintptr_t* p) {
|
|
#if defined(HOST_ARCH_X64)
|
|
return static_cast<uintptr_t>(
|
|
InterlockedDecrement64(reinterpret_cast<LONGLONG*>(p))) + 1;
|
|
#elif defined(HOST_ARCH_IA32)
|
|
return static_cast<uintptr_t>(
|
|
InterlockedDecrement(reinterpret_cast<LONG*>(p))) + 1;
|
|
#else
|
|
#error Unsupported host architecture.
|
|
#endif
|
|
}
|
|
|
|
|
|
#if !defined(USING_SIMULATOR)
|
|
inline uword AtomicOperations::CompareAndSwapWord(uword* ptr,
|
|
uword old_value,
|
|
uword new_value) {
|
|
#if defined(HOST_ARCH_X64)
|
|
return static_cast<uword>(
|
|
InterlockedCompareExchange64(reinterpret_cast<LONGLONG*>(ptr),
|
|
static_cast<LONGLONG>(new_value),
|
|
static_cast<LONGLONG>(old_value)));
|
|
#elif defined(HOST_ARCH_IA32)
|
|
return static_cast<uword>(
|
|
InterlockedCompareExchange(reinterpret_cast<LONG*>(ptr),
|
|
static_cast<LONG>(new_value),
|
|
static_cast<LONG>(old_value)));
|
|
#else
|
|
#error Unsupported host architecture.
|
|
#endif
|
|
}
|
|
#endif // !defined(USING_SIMULATOR)
|
|
|
|
} // namespace dart
|
|
|
|
#endif // VM_ATOMIC_WIN_H_
|