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/* -*- 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 "MediaDecoder.h"
#include "mozilla/Logging.h"
#include "mozilla/media/MediaUtils.h"
#include "mozilla/Services.h"
#include "mozilla/StaticPtr.h"
namespace mozilla {
#undef LOGW
extern LazyLogModule gMediaDecoderLog;
#define DECODER_LOG(type, msg) MOZ_LOG(gMediaDecoderLog, type, msg)
#define LOGW(...) NS_WARNING(nsPrintfCString(__VA_ARGS__).get())
NS_IMPL_ISUPPORTS(MediaShutdownManager, nsIAsyncShutdownBlocker)
MediaShutdownManager::MediaShutdownManager() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(sInitPhase == NotInited);
}
MediaShutdownManager::~MediaShutdownManager() { MOZ_ASSERT(NS_IsMainThread()); }
// Note that we don't use ClearOnShutdown() on this StaticRefPtr, as that
// may interfere with our shutdown listener.
StaticRefPtr<MediaShutdownManager> MediaShutdownManager::sInstance;
MediaShutdownManager::InitPhase MediaShutdownManager::sInitPhase =
MediaShutdownManager::NotInited;
MediaShutdownManager& MediaShutdownManager::Instance() {
MOZ_ASSERT(NS_IsMainThread());
#ifdef MOZ_DIAGNOSTIC_ASSERT_ENABLED
if (!sInstance) {
MOZ_CRASH_UNSAFE_PRINTF("sInstance is null. sInitPhase=%d",
int(sInitPhase));
}
#endif
return *sInstance;
}
void MediaShutdownManager::InitStatics() {
MOZ_ASSERT(NS_IsMainThread());
if (sInitPhase != NotInited) {
return;
}
sInstance = new MediaShutdownManager();
MOZ_DIAGNOSTIC_ASSERT(sInstance);
nsCOMPtr<nsIAsyncShutdownClient> barrier = media::GetShutdownBarrier();
if (!barrier) {
LOGW("Failed to get barrier, cannot add shutdown blocker!");
sInitPhase = InitFailed;
return;
}
nsresult rv =
barrier->AddBlocker(sInstance, NS_LITERAL_STRING_FROM_CSTRING(__FILE__),
__LINE__, u"MediaShutdownManager shutdown"_ns);
if (NS_FAILED(rv)) {
LOGW("Failed to add shutdown blocker! rv=%x", uint32_t(rv));
sInitPhase = InitFailed;
return;
}
sInitPhase = InitSucceeded;
}
void MediaShutdownManager::RemoveBlocker() {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(sInitPhase == XPCOMShutdownStarted);
MOZ_ASSERT(mDecoders.Count() == 0);
nsCOMPtr<nsIAsyncShutdownClient> barrier = media::GetShutdownBarrier();
// xpcom should still be available because we blocked shutdown by having a
// blocker. Until it completely shuts down we should still be able to get
// the barrier.
MOZ_RELEASE_ASSERT(
barrier,
"Failed to get shutdown barrier, cannot remove shutdown blocker!");
barrier->RemoveBlocker(this);
// Clear our singleton reference. This will probably delete
// this instance, so don't deref |this| clearing sInstance.
sInitPhase = XPCOMShutdownEnded;
sInstance = nullptr;
DECODER_LOG(LogLevel::Debug, ("MediaShutdownManager::BlockShutdown() end."));
}
nsresult MediaShutdownManager::Register(MediaDecoder* aDecoder) {
MOZ_ASSERT(NS_IsMainThread());
if (sInitPhase == InitFailed) {
return NS_ERROR_NOT_INITIALIZED;
}
if (sInitPhase == XPCOMShutdownStarted) {
return NS_ERROR_ABORT;
}
// 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);
return NS_OK;
}
void MediaShutdownManager::Unregister(MediaDecoder* aDecoder) {
MOZ_ASSERT(NS_IsMainThread());
if (!mDecoders.Contains(aDecoder)) {
return;
}
mDecoders.RemoveEntry(aDecoder);
if (sInitPhase == XPCOMShutdownStarted && mDecoders.Count() == 0) {
RemoveBlocker();
}
}
NS_IMETHODIMP
MediaShutdownManager::GetName(nsAString& aName) {
aName = u"MediaShutdownManager: shutdown"_ns;
return NS_OK;
}
NS_IMETHODIMP
MediaShutdownManager::GetState(nsIPropertyBag**) { return NS_OK; }
NS_IMETHODIMP
MediaShutdownManager::BlockShutdown(nsIAsyncShutdownClient*) {
MOZ_ASSERT(NS_IsMainThread());
MOZ_DIAGNOSTIC_ASSERT(sInitPhase == InitSucceeded);
MOZ_DIAGNOSTIC_ASSERT(sInstance);
DECODER_LOG(LogLevel::Debug,
("MediaShutdownManager::BlockShutdown() start..."));
// Set this flag to ensure no Register() is allowed when Shutdown() begins.
sInitPhase = XPCOMShutdownStarted;
auto oldCount = mDecoders.Count();
if (oldCount == 0) {
RemoveBlocker();
return NS_OK;
}
// Iterate over the decoders and shut them down.
for (auto iter = mDecoders.Iter(); !iter.Done(); iter.Next()) {
iter.Get()->GetKey()->NotifyXPCOMShutdown();
// Check MediaDecoder::Shutdown doesn't call Unregister() synchronously in
// order not to corrupt our hashtable traversal.
MOZ_ASSERT(mDecoders.Count() == oldCount);
}
return NS_OK;
}
} // namespace mozilla
// avoid redefined macro in unified build
#undef LOGW
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