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comparison: content/media/MediaShutdownManager.cpp
content/media/MediaShutdownManager.cpp
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| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ | |
| 2 /* vim:set ts=2 sw=2 sts=2 et cindent: */ | |
| 3 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 4 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 6 | |
| 7 #include "MediaShutdownManager.h" | |
| 8 #include "nsContentUtils.h" | |
| 9 #include "mozilla/StaticPtr.h" | |
| 10 #include "MediaDecoder.h" | |
| 11 #include "SharedThreadPool.h" | |
| 12 #include "prlog.h" | |
| 13 | |
| 14 namespace mozilla { | |
| 15 | |
| 16 #ifdef PR_LOGGING | |
| 17 extern PRLogModuleInfo* gMediaDecoderLog; | |
| 18 #define DECODER_LOG(type, msg) PR_LOG(gMediaDecoderLog, type, msg) | |
| 19 #else | |
| 20 #define DECODER_LOG(type, msg) | |
| 21 #endif | |
| 22 | |
| 23 NS_IMPL_ISUPPORTS(MediaShutdownManager, nsIObserver) | |
| 24 | |
| 25 MediaShutdownManager::MediaShutdownManager() | |
| 26 : mIsObservingShutdown(false), | |
| 27 mIsDoingXPCOMShutDown(false) | |
| 28 { | |
| 29 MOZ_ASSERT(NS_IsMainThread()); | |
| 30 MOZ_COUNT_CTOR(MediaShutdownManager); | |
| 31 } | |
| 32 | |
| 33 MediaShutdownManager::~MediaShutdownManager() | |
| 34 { | |
| 35 MOZ_ASSERT(NS_IsMainThread()); | |
| 36 MOZ_COUNT_DTOR(MediaShutdownManager); | |
| 37 } | |
| 38 | |
| 39 // Note that we don't use ClearOnShutdown() on this StaticRefPtr, as that | |
| 40 // may interfere with our shutdown listener. | |
| 41 StaticRefPtr<MediaShutdownManager> MediaShutdownManager::sInstance; | |
| 42 | |
| 43 MediaShutdownManager& | |
| 44 MediaShutdownManager::Instance() | |
| 45 { | |
| 46 MOZ_ASSERT(NS_IsMainThread()); | |
| 47 if (!sInstance) { | |
| 48 sInstance = new MediaShutdownManager(); | |
| 49 } | |
| 50 return *sInstance; | |
| 51 } | |
| 52 | |
| 53 void | |
| 54 MediaShutdownManager::EnsureCorrectShutdownObserverState() | |
| 55 { | |
| 56 MOZ_ASSERT(!mIsDoingXPCOMShutDown); | |
| 57 bool needShutdownObserver = mDecoders.Count() > 0; | |
| 58 if (needShutdownObserver != mIsObservingShutdown) { | |
| 59 mIsObservingShutdown = needShutdownObserver; | |
| 60 if (mIsObservingShutdown) { | |
| 61 nsContentUtils::RegisterShutdownObserver(this); | |
| 62 } else { | |
| 63 nsContentUtils::UnregisterShutdownObserver(this); | |
| 64 // Clear our singleton reference. This will probably delete | |
| 65 // this instance, so don't deref |this| clearing sInstance. | |
| 66 sInstance = nullptr; | |
| 67 } | |
| 68 } | |
| 69 } | |
| 70 | |
| 71 void | |
| 72 MediaShutdownManager::Register(MediaDecoder* aDecoder) | |
| 73 { | |
| 74 MOZ_ASSERT(NS_IsMainThread()); | |
| 75 // Don't call Register() after you've Unregistered() all the decoders, | |
| 76 // that's not going to work. | |
| 77 MOZ_ASSERT(!mDecoders.Contains(aDecoder)); | |
| 78 mDecoders.PutEntry(aDecoder); | |
| 79 MOZ_ASSERT(mDecoders.Contains(aDecoder)); | |
| 80 MOZ_ASSERT(mDecoders.Count() > 0); | |
| 81 EnsureCorrectShutdownObserverState(); | |
| 82 } | |
| 83 | |
| 84 void | |
| 85 MediaShutdownManager::Unregister(MediaDecoder* aDecoder) | |
| 86 { | |
| 87 MOZ_ASSERT(NS_IsMainThread()); | |
| 88 MOZ_ASSERT(mDecoders.Contains(aDecoder)); | |
| 89 if (!mIsDoingXPCOMShutDown) { | |
| 90 mDecoders.RemoveEntry(aDecoder); | |
| 91 EnsureCorrectShutdownObserverState(); | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 NS_IMETHODIMP | |
| 96 MediaShutdownManager::Observe(nsISupports *aSubjet, | |
| 97 const char *aTopic, | |
| 98 const char16_t *someData) | |
| 99 { | |
| 100 MOZ_ASSERT(NS_IsMainThread()); | |
| 101 if (strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID) == 0) { | |
| 102 Shutdown(); | |
| 103 } | |
| 104 return NS_OK; | |
| 105 } | |
| 106 | |
| 107 static PLDHashOperator | |
| 108 ShutdownMediaDecoder(nsRefPtrHashKey<MediaDecoder>* aEntry, void*) | |
| 109 { | |
| 110 aEntry->GetKey()->Shutdown(); | |
| 111 return PL_DHASH_REMOVE; | |
| 112 } | |
| 113 | |
| 114 void | |
| 115 MediaShutdownManager::Shutdown() | |
| 116 { | |
| 117 MOZ_ASSERT(NS_IsMainThread()); | |
| 118 MOZ_ASSERT(sInstance); | |
| 119 | |
| 120 DECODER_LOG(PR_LOG_DEBUG, ("MediaShutdownManager::Shutdown() start...")); | |
| 121 | |
| 122 // Mark that we're shutting down, so that Unregister(*) calls don't remove | |
| 123 // hashtable entries. If Unregsiter(*) was to remove from the hash table, | |
| 124 // the iterations over the hashtables below would be disrupted. | |
| 125 mIsDoingXPCOMShutDown = true; | |
| 126 | |
| 127 // Iterate over the decoders and shut them down, and remove them from the | |
| 128 // hashtable. | |
| 129 mDecoders.EnumerateEntries(ShutdownMediaDecoder, nullptr); | |
| 130 | |
| 131 // Ensure all media shared thread pools are shutdown. This joins with all | |
| 132 // threads in the state machine thread pool, the decoder thread pool, and | |
| 133 // any others. | |
| 134 SharedThreadPool::SpinUntilShutdown(); | |
| 135 | |
| 136 // Remove the MediaShutdownManager instance from the shutdown observer | |
| 137 // list. | |
| 138 nsContentUtils::UnregisterShutdownObserver(this); | |
| 139 | |
| 140 // Clear the singleton instance. The only remaining reference should be the | |
| 141 // reference that the observer service used to call us with. The | |
| 142 // MediaShutdownManager will be deleted once the observer service cleans | |
| 143 // up after it finishes its notifications. | |
| 144 sInstance = nullptr; | |
| 145 | |
| 146 DECODER_LOG(PR_LOG_DEBUG, ("MediaShutdownManager::Shutdown() end.")); | |
| 147 } | |
| 148 | |
| 149 } // namespace mozilla |
