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