46ad5426b0
Reason for revert: Broke downstream compile step, possibly relandable when using a MSVC version that has constexpr, other than that I'm out of ideas. .../webrtc/base/atomicops.h:71:8: note: no known conversion for argument 1 from '<brace-enclosed initializer list>' to 'const rtc::AtomicInt&' Original issue's description: > Reland of "Create rtc::AtomicInt POD struct." > > Relands https://codereview.webrtc.org/1420043008/ with brace initializers > instead of constructors hoping that they won't introduce static > initializers. > > BUG= > R=tommi@webrtc.org > > Committed: https://crrev.com/84f0970d100e67a1dc4fe9a1b16b7d293302044e > Cr-Commit-Position: refs/heads/master@{#10920} TBR=tommi@webrtc.org NOPRESUBMIT=true NOTREECHECKS=true NOTRY=true BUG= Review URL: https://codereview.webrtc.org/1505053002 Cr-Commit-Position: refs/heads/master@{#10922}
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*
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* Copyright 2011 The WebRTC Project Authors. All rights reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef WEBRTC_BASE_ATOMICOPS_H_
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#define WEBRTC_BASE_ATOMICOPS_H_
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#if defined(WEBRTC_WIN)
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// Include winsock2.h before including <windows.h> to maintain consistency with
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// win32.h. We can't include win32.h directly here since it pulls in
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// headers such as basictypes.h which causes problems in Chromium where webrtc
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// exists as two separate projects, webrtc and libjingle.
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#include <winsock2.h>
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#include <windows.h>
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#endif // defined(WEBRTC_WIN)
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namespace rtc {
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class AtomicOps {
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public:
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#if defined(WEBRTC_WIN)
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// Assumes sizeof(int) == sizeof(LONG), which it is on Win32 and Win64.
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static int Increment(volatile int* i) {
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return ::InterlockedIncrement(reinterpret_cast<volatile LONG*>(i));
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}
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static int Decrement(volatile int* i) {
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return ::InterlockedDecrement(reinterpret_cast<volatile LONG*>(i));
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}
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static int AcquireLoad(volatile const int* i) {
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return *i;
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}
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static void ReleaseStore(volatile int* i, int value) {
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*i = value;
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}
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static int CompareAndSwap(volatile int* i, int old_value, int new_value) {
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return ::InterlockedCompareExchange(reinterpret_cast<volatile LONG*>(i),
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new_value,
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old_value);
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}
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// Pointer variants.
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template <typename T>
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static T* AtomicLoadPtr(T* volatile* ptr) {
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return *ptr;
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}
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template <typename T>
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static T* CompareAndSwapPtr(T* volatile* ptr, T* old_value, T* new_value) {
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return static_cast<T*>(::InterlockedCompareExchangePointer(
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reinterpret_cast<PVOID volatile*>(ptr), old_value, new_value));
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}
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#else
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static int Increment(volatile int* i) {
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return __sync_add_and_fetch(i, 1);
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}
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static int Decrement(volatile int* i) {
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return __sync_sub_and_fetch(i, 1);
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}
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static int AcquireLoad(volatile const int* i) {
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return __atomic_load_n(i, __ATOMIC_ACQUIRE);
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}
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static void ReleaseStore(volatile int* i, int value) {
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__atomic_store_n(i, value, __ATOMIC_RELEASE);
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}
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static int CompareAndSwap(volatile int* i, int old_value, int new_value) {
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return __sync_val_compare_and_swap(i, old_value, new_value);
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}
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// Pointer variants.
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template <typename T>
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static T* AtomicLoadPtr(T* volatile* ptr) {
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return __atomic_load_n(ptr, __ATOMIC_ACQUIRE);
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}
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template <typename T>
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static T* CompareAndSwapPtr(T* volatile* ptr, T* old_value, T* 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
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};
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}
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#endif // WEBRTC_BASE_ATOMICOPS_H_
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