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68 lines
1.6 KiB
C++
68 lines
1.6 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 GFX_VR_MUTEX_H
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#define GFX_VR_MUTEX_H
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#if defined(XP_WIN)
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# include "nsTString.h"
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#endif
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namespace mozilla {
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namespace gfx {
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#if defined(XP_WIN)
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class WaitForMutex {
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public:
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explicit WaitForMutex(HANDLE handle) : mHandle(handle), mStatus(false) {
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MOZ_ASSERT(mHandle);
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DWORD dwWaitResult;
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dwWaitResult = WaitForSingleObject(mHandle, // handle to mutex
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INFINITE); // no time-out interval
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switch (dwWaitResult) {
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// The thread got ownership of the mutex
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case WAIT_OBJECT_0:
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mStatus = true;
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break;
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// The thread got ownership of an abandoned mutex
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// The shmem is in an indeterminate state
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case WAIT_ABANDONED:
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mStatus = false;
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break;
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default:
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mStatus = false;
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break;
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}
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}
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~WaitForMutex() {
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if (mHandle && !ReleaseMutex(mHandle)) {
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# ifdef MOZILLA_INTERNAL_API
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nsAutoCString msg;
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msg.AppendPrintf("WaitForMutex %p ReleaseMutex error \"%lu\".", mHandle,
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GetLastError());
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NS_WARNING(msg.get());
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# endif
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MOZ_ASSERT(false, "Failed to release mutex.");
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}
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}
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bool GetStatus() { return mStatus; }
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private:
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HANDLE mHandle;
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bool mStatus;
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};
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#endif
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} // namespace gfx
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} // namespace mozilla
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#endif /* GFX_VR_MUTEX_H */
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