mirror of
https://github.com/classilla/tenfourfox.git
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185 lines
5.2 KiB
C++
185 lines
5.2 KiB
C++
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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:set ts=2 sw=2 sts=2 et cindent: */
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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 "MediaTimer.h"
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#include <math.h>
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#include "nsComponentManagerUtils.h"
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#include "nsThreadUtils.h"
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#include "mozilla/DebugOnly.h"
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#include "mozilla/RefPtr.h"
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#include "mozilla/SharedThreadPool.h"
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namespace mozilla {
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NS_IMPL_ADDREF(MediaTimer)
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NS_IMPL_RELEASE_WITH_DESTROY(MediaTimer, DispatchDestroy())
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MediaTimer::MediaTimer()
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: mMonitor("MediaTimer Monitor")
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, mTimer(do_CreateInstance("@mozilla.org/timer;1"))
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, mCreationTimeStamp(TimeStamp::Now())
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, mUpdateScheduled(false)
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{
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TIMER_LOG("MediaTimer::MediaTimer");
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// Use the SharedThreadPool to create an nsIThreadPool with a maximum of one
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// thread, which is equivalent to an nsIThread for our purposes.
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RefPtr<SharedThreadPool> threadPool(
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SharedThreadPool::Get(NS_LITERAL_CSTRING("MediaTimer"), 1));
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mThread = threadPool.get();
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mTimer->SetTarget(mThread);
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}
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void
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MediaTimer::DispatchDestroy()
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{
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nsCOMPtr<nsIRunnable> task = NS_NewNonOwningRunnableMethod(this, &MediaTimer::Destroy);
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// Hold a strong reference to the thread so that it doesn't get deleted in
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// Destroy(), which may run completely before the stack if Dispatch() begins
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// to unwind.
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nsCOMPtr<nsIEventTarget> thread = mThread;
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nsresult rv = thread->Dispatch(task, NS_DISPATCH_NORMAL);
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MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
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(void) rv;
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}
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void
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MediaTimer::Destroy()
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{
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MOZ_ASSERT(OnMediaTimerThread());
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TIMER_LOG("MediaTimer::Destroy");
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// Reject any outstanding entries. There's no need to acquire the monitor
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// here, because we're on the timer thread and all other references to us
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// must be gone.
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while (!mEntries.empty()) {
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mEntries.top().mPromise->Reject(false, __func__);
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mEntries.pop();
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}
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// Cancel the timer if necessary.
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CancelTimerIfArmed();
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delete this;
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}
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bool
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MediaTimer::OnMediaTimerThread()
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{
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bool rv = false;
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mThread->IsOnCurrentThread(&rv);
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return rv;
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}
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RefPtr<MediaTimerPromise>
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MediaTimer::WaitUntil(const TimeStamp& aTimeStamp, const char* aCallSite)
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{
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MonitorAutoLock mon(mMonitor);
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TIMER_LOG("MediaTimer::WaitUntil %lld", RelativeMicroseconds(aTimeStamp));
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Entry e(aTimeStamp, aCallSite);
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RefPtr<MediaTimerPromise> p = e.mPromise.get();
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mEntries.push(e);
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ScheduleUpdate();
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return p;
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}
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void
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MediaTimer::ScheduleUpdate()
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{
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mMonitor.AssertCurrentThreadOwns();
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if (mUpdateScheduled) {
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return;
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}
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mUpdateScheduled = true;
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nsCOMPtr<nsIRunnable> task = NS_NewRunnableMethod(this, &MediaTimer::Update);
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nsresult rv = mThread->Dispatch(task, NS_DISPATCH_NORMAL);
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MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
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(void) rv;
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}
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void
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MediaTimer::Update()
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{
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MonitorAutoLock mon(mMonitor);
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UpdateLocked();
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}
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void
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MediaTimer::UpdateLocked()
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{
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MOZ_ASSERT(OnMediaTimerThread());
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mMonitor.AssertCurrentThreadOwns();
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mUpdateScheduled = false;
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TIMER_LOG("MediaTimer::UpdateLocked");
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// Resolve all the promises whose time is up.
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TimeStamp now = TimeStamp::Now();
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while (!mEntries.empty() && mEntries.top().mTimeStamp <= now) {
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mEntries.top().mPromise->Resolve(true, __func__);
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DebugOnly<TimeStamp> poppedTimeStamp = mEntries.top().mTimeStamp;
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mEntries.pop();
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MOZ_ASSERT_IF(!mEntries.empty(), *&poppedTimeStamp <= mEntries.top().mTimeStamp);
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}
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// If we've got no more entries, cancel any pending timer and bail out.
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if (mEntries.empty()) {
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CancelTimerIfArmed();
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return;
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}
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// We've got more entries - (re)arm the timer for the soonest one.
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if (!TimerIsArmed() || mEntries.top().mTimeStamp < mCurrentTimerTarget) {
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CancelTimerIfArmed();
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ArmTimer(mEntries.top().mTimeStamp, now);
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}
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}
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/*
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* We use a callback function, rather than a callback method, to ensure that
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* the nsITimer does not artifically keep the refcount of the MediaTimer above
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* zero. When the MediaTimer is destroyed, it safely cancels the nsITimer so that
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* we never fire against a dangling closure.
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*/
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/* static */ void
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MediaTimer::TimerCallback(nsITimer* aTimer, void* aClosure)
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{
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static_cast<MediaTimer*>(aClosure)->TimerFired();
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}
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void
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MediaTimer::TimerFired()
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{
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MonitorAutoLock mon(mMonitor);
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MOZ_ASSERT(OnMediaTimerThread());
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mCurrentTimerTarget = TimeStamp();
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UpdateLocked();
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}
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void
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MediaTimer::ArmTimer(const TimeStamp& aTarget, const TimeStamp& aNow)
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{
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MOZ_DIAGNOSTIC_ASSERT(!TimerIsArmed());
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MOZ_DIAGNOSTIC_ASSERT(aTarget > aNow);
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// XPCOM timer resolution is in milliseconds. It's important to never resolve
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// a timer when mTarget might compare < now (even if very close), so round up.
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unsigned long delay = std::ceil((aTarget - aNow).ToMilliseconds());
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TIMER_LOG("MediaTimer::ArmTimer delay=%lu", delay);
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mCurrentTimerTarget = aTarget;
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nsresult rv = mTimer->InitWithNamedFuncCallback(&TimerCallback, this, delay,
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nsITimer::TYPE_ONE_SHOT,
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"MediaTimer::TimerCallback");
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MOZ_DIAGNOSTIC_ASSERT(NS_SUCCEEDED(rv));
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(void) rv;
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}
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} // namespace mozilla
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