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58 lines
1.6 KiB
C++
58 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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#include "FlushableTaskQueue.h"
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namespace mozilla {
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void
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FlushableTaskQueue::Flush()
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{
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MonitorAutoLock mon(mQueueMonitor);
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AutoSetFlushing autoFlush(this);
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FlushLocked();
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AwaitIdleLocked();
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}
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nsresult
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FlushableTaskQueue::FlushAndDispatch(already_AddRefed<nsIRunnable> aRunnable)
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{
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nsCOMPtr<nsIRunnable> r = aRunnable;
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{
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MonitorAutoLock mon(mQueueMonitor);
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AutoSetFlushing autoFlush(this);
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FlushLocked();
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nsresult rv = DispatchLocked(/* passed by ref */r, IgnoreFlushing, AssertDispatchSuccess);
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NS_ENSURE_SUCCESS(rv, rv);
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AwaitIdleLocked();
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}
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// If the ownership of |r| is not transferred in DispatchLocked() due to
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// dispatch failure, it will be deleted here outside the lock. We do so
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// since the destructor of the runnable might access TaskQueue and result
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// in deadlocks.
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return NS_OK;
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}
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void
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FlushableTaskQueue::FlushLocked()
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{
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// Make sure there are no tasks for this queue waiting in the caller's tail
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// dispatcher.
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MOZ_ASSERT_IF(AbstractThread::GetCurrent(),
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!AbstractThread::GetCurrent()->TailDispatcher().HasTasksFor(this));
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mQueueMonitor.AssertCurrentThreadOwns();
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MOZ_ASSERT(mIsFlushing);
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// Clear the tasks. If this strikes you as awful, stop using a
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// FlushableTaskQueue.
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while (!mTasks.empty()) {
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mTasks.pop();
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}
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}
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} // namespace mozilla
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