mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-04 16:15:25 +00:00
99f6b1c31c
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 -*- */
|
|
/* vim:set ts=2 sw=2 sts=2 et cindent: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#include "MediaShutdownManager.h"
|
|
#include "nsContentUtils.h"
|
|
#include "mozilla/StaticPtr.h"
|
|
#include "MediaDecoder.h"
|
|
#include "mozilla/Logging.h"
|
|
|
|
namespace mozilla {
|
|
|
|
extern PRLogModuleInfo* gMediaDecoderLog;
|
|
#define DECODER_LOG(type, msg) MOZ_LOG(gMediaDecoderLog, type, msg)
|
|
|
|
NS_IMPL_ISUPPORTS(MediaShutdownManager, nsIObserver)
|
|
|
|
MediaShutdownManager::MediaShutdownManager()
|
|
: mIsObservingShutdown(false),
|
|
mIsDoingXPCOMShutDown(false)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
MOZ_COUNT_CTOR(MediaShutdownManager);
|
|
}
|
|
|
|
MediaShutdownManager::~MediaShutdownManager()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
MOZ_COUNT_DTOR(MediaShutdownManager);
|
|
}
|
|
|
|
// Note that we don't use ClearOnShutdown() on this StaticRefPtr, as that
|
|
// may interfere with our shutdown listener.
|
|
StaticRefPtr<MediaShutdownManager> MediaShutdownManager::sInstance;
|
|
|
|
MediaShutdownManager&
|
|
MediaShutdownManager::Instance()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
if (!sInstance) {
|
|
sInstance = new MediaShutdownManager();
|
|
}
|
|
return *sInstance;
|
|
}
|
|
|
|
void
|
|
MediaShutdownManager::EnsureCorrectShutdownObserverState()
|
|
{
|
|
MOZ_ASSERT(!mIsDoingXPCOMShutDown);
|
|
bool needShutdownObserver = mDecoders.Count() > 0;
|
|
if (needShutdownObserver != mIsObservingShutdown) {
|
|
mIsObservingShutdown = needShutdownObserver;
|
|
if (mIsObservingShutdown) {
|
|
nsContentUtils::RegisterShutdownObserver(this);
|
|
} else {
|
|
nsContentUtils::UnregisterShutdownObserver(this);
|
|
// Clear our singleton reference. This will probably delete
|
|
// this instance, so don't deref |this| clearing sInstance.
|
|
sInstance = nullptr;
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
MediaShutdownManager::Register(MediaDecoder* aDecoder)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
// Don't call Register() after you've Unregistered() all the decoders,
|
|
// that's not going to work.
|
|
MOZ_ASSERT(!mDecoders.Contains(aDecoder));
|
|
mDecoders.PutEntry(aDecoder);
|
|
MOZ_ASSERT(mDecoders.Contains(aDecoder));
|
|
MOZ_ASSERT(mDecoders.Count() > 0);
|
|
EnsureCorrectShutdownObserverState();
|
|
}
|
|
|
|
void
|
|
MediaShutdownManager::Unregister(MediaDecoder* aDecoder)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
MOZ_ASSERT(mDecoders.Contains(aDecoder));
|
|
if (!mIsDoingXPCOMShutDown) {
|
|
mDecoders.RemoveEntry(aDecoder);
|
|
EnsureCorrectShutdownObserverState();
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
MediaShutdownManager::Observe(nsISupports *aSubjet,
|
|
const char *aTopic,
|
|
const char16_t *someData)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) {
|
|
Shutdown();
|
|
}
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
MediaShutdownManager::Shutdown()
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
MOZ_ASSERT(sInstance);
|
|
|
|
DECODER_LOG(LogLevel::Debug, ("MediaShutdownManager::Shutdown() start..."));
|
|
|
|
// Mark that we're shutting down, so that Unregister(*) calls don't remove
|
|
// hashtable entries. If Unregsiter(*) was to remove from the hash table,
|
|
// the iterations over the hashtables below would be disrupted.
|
|
mIsDoingXPCOMShutDown = true;
|
|
|
|
// Iterate over the decoders and shut them down, and remove them from the
|
|
// hashtable.
|
|
for (auto iter = mDecoders.Iter(); !iter.Done(); iter.Next()) {
|
|
iter.Get()->GetKey()->Shutdown();
|
|
iter.Remove();
|
|
}
|
|
|
|
// Remove the MediaShutdownManager instance from the shutdown observer
|
|
// list.
|
|
nsContentUtils::UnregisterShutdownObserver(this);
|
|
|
|
// Clear the singleton instance. The only remaining reference should be the
|
|
// reference that the observer service used to call us with. The
|
|
// MediaShutdownManager will be deleted once the observer service cleans
|
|
// up after it finishes its notifications.
|
|
sInstance = nullptr;
|
|
|
|
DECODER_LOG(LogLevel::Debug, ("MediaShutdownManager::Shutdown() end."));
|
|
}
|
|
|
|
} // namespace mozilla
|