зеркало из https://github.com/mozilla/gecko-dev.git
66 строки
2.7 KiB
C++
66 строки
2.7 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 GMPCrashHelperHolder_h_
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#define GMPCrashHelperHolder_h_
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#include "mozilla/RefPtr.h"
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#include "GMPCrashHelper.h"
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namespace mozilla {
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// Disconnecting the GMPCrashHelpers at the right time is hard. We need to
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// ensure that in the crashing case that we stay connected until the
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// "gmp-plugin-crashed" message is processed in the content process.
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//
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// We have two channels connecting to the GMP; PGMP which connects from
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// chrome to GMP process, and PGMPContent, which bridges between the content
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// and GMP process. If the GMP crashes both PGMP and PGMPContent receive
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// ActorDestroy messages and begin to shutdown at the same time.
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//
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// However the crash report mini dump must be generated in the chrome
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// process' ActorDestroy, before the "gmp-plugin-crashed" message can be sent
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// to the content process. We fire the "PluginCrashed" event when we handle
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// the "gmp-plugin-crashed" message in the content process, and we need the
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// crash helpers to do that.
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//
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// The PGMPContent's managed actors' ActorDestroy messages are the only shutdown
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// notification we get in the content process, but we can't disconnect the
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// crash handlers there in the crashing case, as ActorDestroy happens before
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// we've received the "gmp-plugin-crashed" message and had a chance for the
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// crash helpers to generate the window to dispatch PluginCrashed to initiate
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// the crash report submission notification box.
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//
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// So we need to ensure that in the content process, the GMPCrashHelpers stay
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// connected to the GMPService until after ActorDestroy messages are received
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// if there's an abnormal shutdown. In the case where the GMP doesn't crash,
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// we do actually want to disconnect GMPCrashHandlers in ActorDestroy, since
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// we don't have any other signal that a GMP actor is shutting down. If we don't
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// disconnect the crash helper there in the normal shutdown case, the helper
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// will stick around forever and leak.
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//
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// In the crashing case, the GMPCrashHelpers are deallocated when the crash
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// report is processed in GeckoMediaPluginService::RunPluginCrashCallbacks().
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//
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// It's a bit yuck that we have to have two paths for disconnecting the crash
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// helpers, but there aren't really any better options.
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class GMPCrashHelperHolder
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{
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public:
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void SetCrashHelper(GMPCrashHelper* aHelper);
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GMPCrashHelper* GetCrashHelper();
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void MaybeDisconnect(bool aAbnormalShutdown);
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private:
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RefPtr<GMPCrashHelper> mCrashHelper;
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};
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}
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#endif // GMPCrashHelperHolder_h_
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