зеркало из https://github.com/mozilla/gecko-dev.git
131 строка
3.9 KiB
C++
131 строка
3.9 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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* vim: sts=8 sw=2 ts=2 tw=99 et :
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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 _include_mozilla_gfx_ipc_GPUProcessHost_h_
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#define _include_mozilla_gfx_ipc_GPUProcessHost_h_
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#include "mozilla/Function.h"
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#include "mozilla/Maybe.h"
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#include "mozilla/UniquePtr.h"
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#include "mozilla/ipc/GeckoChildProcessHost.h"
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#include "mozilla/ipc/ProtocolUtils.h"
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#include "mozilla/ipc/TaskFactory.h"
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class nsITimer;
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namespace mozilla {
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namespace gfx {
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class GPUChild;
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// GPUProcessHost is the "parent process" container for a subprocess handle and
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// IPC connection. It owns the parent process IPDL actor, which in this case,
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// is a GPUChild.
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//
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// GPUProcessHosts are allocated and managed by GPUProcessManager. For all
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// intents and purposes it is a singleton, though more than one may be allocated
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// at a time due to its shutdown being asynchronous.
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class GPUProcessHost final : public ipc::GeckoChildProcessHost
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{
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friend class GPUChild;
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public:
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class Listener {
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public:
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virtual void OnProcessLaunchComplete(GPUProcessHost* aHost)
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{}
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// The GPUProcessHost has unexpectedly shutdown or had its connection
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// severed. This is not called if an error occurs after calling
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// Shutdown().
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virtual void OnProcessUnexpectedShutdown(GPUProcessHost* aHost)
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{}
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};
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public:
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explicit GPUProcessHost(Listener* listener);
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~GPUProcessHost();
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// Launch the subprocess asynchronously. On failure, false is returned.
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// Otherwise, true is returned, and the OnLaunchComplete listener callback
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// will be invoked either when a connection has been established, or if a
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// connection could not be established due to an asynchronous error.
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bool Launch();
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// If the process is being launched, block until it has launched and
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// connected. If a launch task is pending, it will fire immediately.
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//
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// Returns true if the process is successfully connected; false otherwise.
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bool WaitForLaunch();
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// Inform the process that it should clean up its resources and shut down.
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// This initiates an asynchronous shutdown sequence. After this method returns,
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// it is safe for the caller to forget its pointer to the GPUProcessHost.
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//
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// After this returns, the attached Listener is no longer used.
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void Shutdown();
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// Return the actor for the top-level actor of the process. If the process
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// has not connected yet, this returns null.
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GPUChild* GetActor() const {
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return mGPUChild.get();
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}
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// Return a unique id for this process, guaranteed not to be shared with any
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// past or future instance of GPUProcessHost.
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uint64_t GetProcessToken() const;
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bool IsConnected() const {
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return !!mGPUChild;
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}
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// Called on the IO thread.
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void OnChannelConnected(int32_t peer_pid) override;
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void OnChannelError() override;
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void SetListener(Listener* aListener);
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private:
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// Called on the main thread.
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void OnChannelConnectedTask();
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void OnChannelErrorTask();
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// Called on the main thread after a connection has been established.
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void InitAfterConnect(bool aSucceeded);
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// Called on the main thread when the mGPUChild actor is shutting down.
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void OnChannelClosed();
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// Kill the remote process, triggering IPC shutdown.
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void KillHard(const char* aReason);
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void DestroyProcess();
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private:
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DISALLOW_COPY_AND_ASSIGN(GPUProcessHost);
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Listener* mListener;
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ipc::TaskFactory<GPUProcessHost> mTaskFactory;
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enum class LaunchPhase {
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Unlaunched,
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Waiting,
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Complete
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};
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LaunchPhase mLaunchPhase;
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UniquePtr<GPUChild> mGPUChild;
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uint64_t mProcessToken;
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bool mShutdownRequested;
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bool mChannelClosed;
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};
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} // namespace gfx
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} // namespace mozilla
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#endif // _include_mozilla_gfx_ipc_GPUProcessHost_h_
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