gecko/content/media/MediaShutdownManager.cpp
Ehsan Akhgari ebd358dfd7 Bug 927728 - Part 1: Replace PRUnichar with char16_t; r=roc
This patch was automatically generated by the following script:

#!/bin/bash
# Command to convert PRUnichar to char16_t

function convert() {
echo "Converting $1 to $2..."
find . ! -wholename "*nsprpub*" \
       ! -wholename "*security/nss*" \
       ! -wholename "*modules/libmar*" \
       ! -wholename "*/.hg*" \
       ! -wholename "obj-ff-dbg*" \
       ! -name prtypes.h \
       ! -name Char16.h \
         -type f \
      \( -iname "*.cpp" \
         -o -iname "*.h" \
         -o -iname "*.c" \
         -o -iname "*.cc" \
         -o -iname "*.idl" \
         -o -iname "*.ipdl" \
         -o -iname "*.ipdlh" \
         -o -iname "*.mm" \) | \
    xargs -n 1 sed -i -e "s/\b$1\b/$2/g"
}

convert PRUnichar char16_t
2014-01-04 10:02:17 -05:00

239 lines
6.7 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 "mozilla/ClearOnShutdown.h"
#include "MediaDecoder.h"
namespace mozilla {
StateMachineThread::StateMachineThread()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_COUNT_CTOR(StateMachineThread);
}
StateMachineThread::~StateMachineThread()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_COUNT_DTOR(StateMachineThread);
}
void
StateMachineThread::Shutdown()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mThread);
if (mThread) {
nsCOMPtr<nsIRunnable> event =
NS_NewRunnableMethod(this, &StateMachineThread::ShutdownThread);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
}
}
void
StateMachineThread::ShutdownThread()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mThread);
mThread->Shutdown();
mThread = nullptr;
MediaShutdownManager::Instance().Unregister(this);
}
nsresult
StateMachineThread::Init()
{
MOZ_ASSERT(NS_IsMainThread());
nsresult rv = NS_NewNamedThread("Media State", getter_AddRefs(mThread));
NS_ENSURE_SUCCESS(rv, rv);
MediaShutdownManager::Instance().Register(this);
return NS_OK;
}
nsIThread*
StateMachineThread::GetThread()
{
MOZ_ASSERT(mThread);
return mThread;
}
void
StateMachineThread::SpinUntilShutdownComplete()
{
MOZ_ASSERT(NS_IsMainThread());
while (mThread) {
bool processed = false;
nsresult rv = NS_GetCurrentThread()->ProcessNextEvent(true, &processed);
if (NS_FAILED(rv)) {
NS_WARNING("Failed to spin main thread while awaiting media shutdown");
break;
}
}
}
NS_IMPL_ISUPPORTS1(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) ||
(mStateMachineThreads.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::Register(StateMachineThread* aThread)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(!mStateMachineThreads.Contains(aThread));
mStateMachineThreads.PutEntry(aThread);
MOZ_ASSERT(mStateMachineThreads.Contains(aThread));
MOZ_ASSERT(mStateMachineThreads.Count() > 0);
EnsureCorrectShutdownObserverState();
}
void
MediaShutdownManager::Unregister(StateMachineThread* aThread)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(mStateMachineThreads.Contains(aThread));
if (!mIsDoingXPCOMShutDown) {
mStateMachineThreads.RemoveEntry(aThread);
EnsureCorrectShutdownObserverState();
}
}
static PLDHashOperator
ShutdownMediaDecoder(nsRefPtrHashKey<MediaDecoder>* aEntry, void*)
{
aEntry->GetKey()->Shutdown();
return PL_DHASH_REMOVE;
}
static PLDHashOperator
JoinStateMachineThreads(nsRefPtrHashKey<StateMachineThread>* aEntry, void*)
{
// Hold a strong reference to the StateMachineThread, so that if it
// is Unregistered() and the hashtable's owning reference is cleared,
// it won't be destroyed while we're spinning here.
RefPtr<StateMachineThread> thread = aEntry->GetKey();
thread->SpinUntilShutdownComplete();
return PL_DHASH_REMOVE;
}
void
MediaShutdownManager::Shutdown()
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sInstance);
// 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.
mDecoders.EnumerateEntries(ShutdownMediaDecoder, nullptr);
// Iterate over the StateMachineThreads and wait for them to have finished
// shutting down, and remove them from the hashtable. Once all the decoders
// have shutdown the active state machine thread will naturally shutdown
// asynchronously. We may also have another state machine thread active,
// if construction and shutdown of the state machine thread has interleaved.
mStateMachineThreads.EnumerateEntries(JoinStateMachineThreads, nullptr);
// 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;
}
} // namespace mozilla