import changes from `dev' branch of rmottola/Arctic-Fox:

- Bug 1187817. Part 1 - Move Set{Volume,PlaybackRate,PreservesPitch} to the audio thread. r=kinetik. (a234a7080) - Bug 1187817. Part 2 - remove unused code. r=kinetik. (836c52a19) - Bug 1187763. Part 1 - move while loop out of WaitingForAudioToPlay(). r=kinetik. (a80d70f87) - Bug 1187763. Part 2 - extract some code of AudioLoop() into its own function. r=kinetik. (275b8bfb6) - Bug 1187763. Part 3 - refactor AudioSink::AudioLoop into a series of events. r=kinetik (7eb3f506f) - Bug 1187817. Part 3 - move SetPlaying to the audio thread. r=kinetik. (0fef85968) - Bug 1187817. Part 4 - move some code in Shutdown to the audio thread. r=kinetik. (8c73fbe6d) - Bug 1187817. Part 5 - assert some code in the audio thread and don't enter the monitor. r=kinetik. (64de4616f) - move include (f842b4b1e) - Bug 1163486 - Update test to use new MP4Demuxer. r=bholley (b853be477) - Bug 1190496 - Namespace the SharedThreadPool.h include. r=cpearce (196d25d42) - Bug 1190496 - Hoist SharedThreadPool into xpcom. r=froydnj (3dad8176f) - Bug 1190492 - Hoist AbstractThread and TaskDispatcher to xpcom. r=froydnj (c3329fa29) - bug 1166107 documentation of mWaitForInternalDrain thread access r=gerald (f762764b1) - correct comment (b623b2959) - revert demuxer check from promise reject to assert like in 1156708 (f540b270c) - more chekcs back to asserts (7e82a0f99) - space (733bd85a3) - Bug 1188220: Allow disabling HW acceleration even when SharedDecoderManager isn't used. r=cpearce (909a86682) - bug 1161903 ensure pending DrainComplete is not run after Flush() r=cpearce (648cabbb7) - Bug 1158089 - Fall back to d3d9 DXVA if d3d11 initialization fails. r=cpearce (84b3a8e6d)
2026-05-26 14:18:48 +00:00 · 2021-08-20 10:57:59 +08:00
parent 3b90b72ef4
commit d1af43433c
34 changed files with 577 additions and 352 deletions
@@ -0,0 +1,112 @@
+/* -*- 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/. */
+
+#ifndef SharedThreadPool_h_
+#define SharedThreadPool_h_
+
+#include <queue>
+#include "mozilla/RefPtr.h"
+#include "nsThreadUtils.h"
+#include "nsIThreadManager.h"
+#include "nsIThreadPool.h"
+#include "nsISupports.h"
+#include "nsISupportsImpl.h"
+#include "nsCOMPtr.h"
+
+namespace mozilla {
+
+// Wrapper that makes an nsIThreadPool a singleton, and provides a
+// consistent threadsafe interface to get instances. Callers simply get a
+// SharedThreadPool by the name of its nsIThreadPool. All get requests of
+// the same name get the same SharedThreadPool. Users must store a reference
+// to the pool, and when the last reference to a SharedThreadPool is dropped
+// the pool is shutdown and deleted. Users aren't required to manually
+// shutdown the pool, and can release references on any thread. On Windows
+// all threads in the pool have MSCOM initialized with COINIT_MULTITHREADED.
+class SharedThreadPool : public nsIThreadPool
+{
+public:
+
+  // Gets (possibly creating) the shared thread pool singleton instance with
+  // thread pool named aName.
+  // *Must* be called on the main thread.
+  static already_AddRefed<SharedThreadPool> Get(const nsCString& aName,
+                                            uint32_t aThreadLimit = 4);
+
+  // We implement custom threadsafe AddRef/Release pair, that destroys the
+  // the shared pool singleton when the refcount drops to 0. The addref/release
+  // are implemented using locking, so it's not recommended that you use them
+  // in a tight loop.
+  NS_IMETHOD QueryInterface(REFNSIID aIID, void** aInstancePtr) override;
+  NS_IMETHOD_(MozExternalRefCountType) AddRef(void) override;
+  NS_IMETHOD_(MozExternalRefCountType) Release(void) override;
+
+  // Forward behaviour to wrapped thread pool implementation.
+  NS_FORWARD_SAFE_NSITHREADPOOL(mPool);
+
+  // See bug 1155059 - MSVC forces us to not declare Dispatch normally in idl
+  //  NS_FORWARD_SAFE_NSIEVENTTARGET(mEventTarget);
+  nsresult Dispatch(nsIRunnable *event, uint32_t flags) { return !mEventTarget ? NS_ERROR_NULL_POINTER : mEventTarget->Dispatch(event, flags); }
+ 
+  NS_IMETHOD DispatchFromScript(nsIRunnable *event, uint32_t flags) override {
+      return Dispatch(event, flags);
+  }
+
+  NS_IMETHOD Dispatch(already_AddRefed<nsIRunnable>&& event, uint32_t flags) override
+    { return !mEventTarget ? NS_ERROR_NULL_POINTER : mEventTarget->Dispatch(Move(event), flags); }
+
+  NS_IMETHOD IsOnCurrentThread(bool *_retval) override { return !mEventTarget ? NS_ERROR_NULL_POINTER : mEventTarget->IsOnCurrentThread(_retval); }
+
+  // Creates necessary statics. Called once at startup.
+  static void InitStatics();
+
+  // Spins the event loop until all thread pools are shutdown.
+  // *Must* be called on the main thread.
+  static void SpinUntilEmpty();
+
+#if defined(MOZ_ASAN)
+  // Use the system default in ASAN builds, because the default is assumed to be
+  // larger than the size we want to use and is hopefully sufficient for ASAN.
+  static const uint32_t kStackSize = nsIThreadManager::DEFAULT_STACK_SIZE;
+#elif defined(XP_WIN) || defined(XP_MACOSX) || defined(LINUX)
+  static const uint32_t kStackSize = (256 * 1024);
+#else
+  // All other platforms use their system defaults.
+  static const uint32_t kStackSize = nsIThreadManager::DEFAULT_STACK_SIZE;
+#endif
+
+private:
+
+  // Returns whether there are no pools in existence at the moment.
+  static bool IsEmpty();
+
+  // Creates a singleton SharedThreadPool wrapper around aPool.
+  // aName is the name of the aPool, and is used to lookup the
+  // SharedThreadPool in the hash table of all created pools.
+  SharedThreadPool(const nsCString& aName,
+                   nsIThreadPool* aPool);
+  virtual ~SharedThreadPool();
+
+  nsresult EnsureThreadLimitIsAtLeast(uint32_t aThreadLimit);
+
+  // Name of mPool.
+  const nsCString mName;
+
+  // Thread pool being wrapped.
+  nsCOMPtr<nsIThreadPool> mPool;
+
+  // Refcount. We implement custom ref counting so that the thread pool is
+  // shutdown in a threadsafe manner and singletonness is preserved.
+  nsrefcnt mRefCnt;
+
+  // mPool QI'd to nsIEventTarget. We cache this, so that we can use
+  // NS_FORWARD_SAFE_NSIEVENTTARGET above.
+  nsCOMPtr<nsIEventTarget> mEventTarget;
+};
+
+} // namespace mozilla
+
+#endif // SharedThreadPool_h_