forked from mirrors/gecko-dev
3065034574
We already have a mechanism for ending threads accepting new messages when they are shut down, so this only allows tasks started from thread shutdown tasks during xpcom shutdown to behave consistently. We already didn't prevent dispatching to the background thread pool at this time, so it should make little difference there as well, and may just instead save us from deadlocks where code expects a dispatch to succeed and it does not during actor shutdown. This patch both relaxes the check to only be a NS_ASSERTION, and relaxes it to allow dispatching to the current thread even after xpcom-shutdown-threads as that thread is definitely still alive. Differential Revision: https://phabricator.services.mozilla.com/D144592
57 lines
1.7 KiB
C++
57 lines
1.7 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_ThreadEventTarget_h
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#define mozilla_ThreadEventTarget_h
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#include "mozilla/MemoryReporting.h"
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#include "mozilla/Mutex.h"
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#include "mozilla/SynchronizedEventQueue.h" // for ThreadTargetSink
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#include "nsISerialEventTarget.h"
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namespace mozilla {
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class DelayedRunnable;
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// ThreadEventTarget handles the details of posting an event to a thread. It can
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// be used with any ThreadTargetSink implementation.
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class ThreadEventTarget final : public nsISerialEventTarget {
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public:
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ThreadEventTarget(ThreadTargetSink* aSink, bool aIsMainThread);
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NS_DECL_THREADSAFE_ISUPPORTS
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NS_DECL_NSIEVENTTARGET_FULL
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// Disconnects the target so that it can no longer post events.
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void Disconnect(const MutexAutoLock& aProofOfLock) {
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mSink->Disconnect(aProofOfLock);
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}
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// Sets the thread for which IsOnCurrentThread returns true to the current
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// thread.
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void SetCurrentThread(PRThread* aThread);
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// Call ClearCurrentThread() before the PRThread is deleted on thread join.
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void ClearCurrentThread();
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const {
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size_t n = 0;
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if (mSink) {
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n += mSink->SizeOfIncludingThis(aMallocSizeOf);
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}
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return aMallocSizeOf(this) + n;
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}
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private:
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~ThreadEventTarget();
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RefPtr<ThreadTargetSink> mSink;
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#ifdef DEBUG
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bool mIsMainThread;
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#endif
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};
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} // namespace mozilla
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#endif // mozilla_ThreadEventTarget_h
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