зеркало из https://github.com/mozilla/gecko-dev.git
99 строки
1.7 KiB
C++
99 строки
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_gfx_2d_RwAssert_h
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#define mozilla_gfx_2d_RwAssert_h
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#include "mozilla/Attributes.h"
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#include "mozilla/Mutex.h"
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namespace mozilla {
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namespace gfx {
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class RwAssert {
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public:
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RwAssert()
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: mLock("RwAssert::mLock")
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, mReaders(0)
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, mWriting(false)
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{ }
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~RwAssert()
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{
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MOZ_RELEASE_ASSERT(!mReaders && !mWriting);
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}
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class MOZ_RAII Writer {
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public:
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MOZ_IMPLICIT Writer(RwAssert& aAssert)
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: mAssert(aAssert)
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{
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mAssert.BeginWriting();
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}
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~Writer()
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{
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mAssert.EndWriting();
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}
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private:
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RwAssert& mAssert;
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};
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class MOZ_RAII Reader {
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public:
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MOZ_IMPLICIT Reader(RwAssert& aAssert)
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: mAssert(aAssert)
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{
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mAssert.BeginReading();
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}
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~Reader()
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{
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mAssert.EndReading();
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}
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private:
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RwAssert& mAssert;
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};
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void BeginWriting()
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{
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MutexAutoLock lock(mLock);
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MOZ_RELEASE_ASSERT(!mReaders && !mWriting);
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mWriting = true;
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}
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void EndWriting()
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{
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MutexAutoLock lock(mLock);
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MOZ_ASSERT(mWriting);
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mWriting = false;
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}
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void BeginReading()
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{
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MutexAutoLock lock(mLock);
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MOZ_RELEASE_ASSERT(!mWriting);
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mReaders += 1;
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}
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void EndReading()
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{
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MutexAutoLock lock(mLock);
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MOZ_ASSERT(mReaders > 0);
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mReaders -= 1;
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}
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private:
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Mutex mLock;
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uint32_t mReaders;
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bool mWriting;
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};
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} // namespace gfx
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} // namespace mozilla
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#endif // mozilla_gfx_2d_RwAssert_h
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