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a12f43448b
This happens after xpcom-shutdown, and is the notification we're supposed to listen for to shutdown off-main-thread event queues.
136 lines
4.0 KiB
C++
136 lines
4.0 KiB
C++
/* -*- 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 "MediaShutdownManager.h"
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#include "nsContentUtils.h"
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#include "mozilla/StaticPtr.h"
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#include "MediaDecoder.h"
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#include "mozilla/Logging.h"
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namespace mozilla {
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extern PRLogModuleInfo* gMediaDecoderLog;
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#define DECODER_LOG(type, msg) MOZ_LOG(gMediaDecoderLog, type, msg)
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NS_IMPL_ISUPPORTS(MediaShutdownManager, nsIObserver)
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MediaShutdownManager::MediaShutdownManager()
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: mIsObservingShutdown(false),
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mIsDoingXPCOMShutDown(false)
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_COUNT_CTOR(MediaShutdownManager);
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}
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MediaShutdownManager::~MediaShutdownManager()
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_COUNT_DTOR(MediaShutdownManager);
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}
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// Note that we don't use ClearOnShutdown() on this StaticRefPtr, as that
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// may interfere with our shutdown listener.
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StaticRefPtr<MediaShutdownManager> MediaShutdownManager::sInstance;
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MediaShutdownManager&
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MediaShutdownManager::Instance()
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{
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MOZ_ASSERT(NS_IsMainThread());
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if (!sInstance) {
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sInstance = new MediaShutdownManager();
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}
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return *sInstance;
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}
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void
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MediaShutdownManager::EnsureCorrectShutdownObserverState()
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{
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MOZ_ASSERT(!mIsDoingXPCOMShutDown);
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bool needShutdownObserver = mDecoders.Count() > 0;
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if (needShutdownObserver != mIsObservingShutdown) {
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mIsObservingShutdown = needShutdownObserver;
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if (mIsObservingShutdown) {
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nsContentUtils::RegisterShutdownObserver(this);
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} else {
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nsContentUtils::UnregisterShutdownObserver(this);
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// Clear our singleton reference. This will probably delete
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// this instance, so don't deref |this| clearing sInstance.
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sInstance = nullptr;
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}
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}
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}
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void
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MediaShutdownManager::Register(MediaDecoder* aDecoder)
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{
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MOZ_ASSERT(NS_IsMainThread());
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// Don't call Register() after you've Unregistered() all the decoders,
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// that's not going to work.
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MOZ_ASSERT(!mDecoders.Contains(aDecoder));
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mDecoders.PutEntry(aDecoder);
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MOZ_ASSERT(mDecoders.Contains(aDecoder));
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MOZ_ASSERT(mDecoders.Count() > 0);
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EnsureCorrectShutdownObserverState();
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}
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void
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MediaShutdownManager::Unregister(MediaDecoder* aDecoder)
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(mDecoders.Contains(aDecoder));
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if (!mIsDoingXPCOMShutDown) {
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mDecoders.RemoveEntry(aDecoder);
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EnsureCorrectShutdownObserverState();
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}
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}
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NS_IMETHODIMP
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MediaShutdownManager::Observe(nsISupports *aSubjet,
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const char *aTopic,
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const char16_t *someData)
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{
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MOZ_ASSERT(NS_IsMainThread());
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if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
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Shutdown();
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}
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return NS_OK;
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}
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void
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MediaShutdownManager::Shutdown()
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{
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(sInstance);
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DECODER_LOG(LogLevel::Debug, ("MediaShutdownManager::Shutdown() start..."));
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// Mark that we're shutting down, so that Unregister(*) calls don't remove
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// hashtable entries. If Unregsiter(*) was to remove from the hash table,
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// the iterations over the hashtables below would be disrupted.
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mIsDoingXPCOMShutDown = true;
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// Iterate over the decoders and shut them down, and remove them from the
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// hashtable.
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for (auto iter = mDecoders.Iter(); !iter.Done(); iter.Next()) {
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iter.Get()->GetKey()->Shutdown();
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iter.Remove();
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}
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// Remove the MediaShutdownManager instance from the shutdown observer
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// list.
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nsContentUtils::UnregisterShutdownObserver(this);
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// Clear the singleton instance. The only remaining reference should be the
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// reference that the observer service used to call us with. The
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// MediaShutdownManager will be deleted once the observer service cleans
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// up after it finishes its notifications.
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sInstance = nullptr;
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DECODER_LOG(LogLevel::Debug, ("MediaShutdownManager::Shutdown() end."));
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}
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} // namespace mozilla
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