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5f5804e41b
This change brings the related ShMem code from VRManager and VRService into a new class, VRShMem. This is to support future work where this ShMem will be used for other efforts. Having this code in the same class will enable it to be more easily shared in these efforts. Until the new class replaces the code in VRManager and VRService, it can be exercised and validated with two instances of vrtesthost, with the -testmgr and -testsvc parameters. Differential Revision: https://phabricator.services.mozilla.com/D36649 --HG-- extra : moz-landing-system : lando
64 lines
1.6 KiB
C++
64 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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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 %d 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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