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We want to spin for faster response, but we only want to spin for a very short time. If we're waiting for a while, we don't want to be burning CPU for the entire time. Therefore, only spin for 30 ms, then fall back to waiting on an event. MozReview-Commit-ID: ErAIwpsIqYz --HG-- extra : rebase_source : b6ac024adb7853456fd06c4385cf32184c8aeca2
42 lines
1.1 KiB
C++
42 lines
1.1 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_mscom_SpinEvent_h
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#define mozilla_mscom_SpinEvent_h
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#include "mozilla/Atomics.h"
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#include "mozilla/Attributes.h"
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#include "nsWindowsHelpers.h"
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namespace mozilla {
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namespace mscom {
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class MOZ_NON_TEMPORARY_CLASS SpinEvent final
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{
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public:
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SpinEvent();
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~SpinEvent() = default;
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bool Wait(HANDLE aTargetThread);
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void Signal();
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SpinEvent(const SpinEvent&) = delete;
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SpinEvent(SpinEvent&&) = delete;
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SpinEvent& operator=(SpinEvent&&) = delete;
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SpinEvent& operator=(const SpinEvent&) = delete;
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private:
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Atomic<bool, ReleaseAcquire> mDone;
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nsAutoHandle mDoneEvent;
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static bool InitStatics();
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static bool sIsMulticore;
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};
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} // namespace mscom
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} // namespace mozilla
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#endif // mozilla_mscom_SpinEvent_h
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