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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef GFX_VR_MUTEX_H
#define GFX_VR_MUTEX_H
#if defined(XP_WIN)
# include "nsTString.h"
#endif
namespace mozilla {
namespace gfx {
#if defined(XP_WIN)
class WaitForMutex {
public:
explicit WaitForMutex(HANDLE handle) : mHandle(handle), mStatus(false) {
MOZ_ASSERT(mHandle);
DWORD dwWaitResult;
dwWaitResult = WaitForSingleObject(mHandle, // handle to mutex
INFINITE); // no time-out interval
switch (dwWaitResult) {
// The thread got ownership of the mutex
case WAIT_OBJECT_0:
mStatus = true;
break;
// The thread got ownership of an abandoned mutex
// The shmem is in an indeterminate state
case WAIT_ABANDONED:
mStatus = false;
break;
default:
mStatus = false;
break;
}
}
~WaitForMutex() {
if (mHandle && !ReleaseMutex(mHandle)) {
# ifdef MOZILLA_INTERNAL_API
nsAutoCString msg;
msg.AppendPrintf("WaitForMutex %p ReleaseMutex error \"%lu\".", mHandle,
GetLastError());
NS_WARNING(msg.get());
# endif
MOZ_ASSERT(false, "Failed to release mutex.");
}
}
bool GetStatus() { return mStatus; }
private:
HANDLE mHandle;
bool mStatus;
};
#endif
} // namespace gfx
} // namespace mozilla
#endif /* GFX_VR_MUTEX_H */
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