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/* -*- 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/Function.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 OnProcessDeviceReset(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<GPUProcessHost> mTaskFactory;
enum class LaunchPhase {
Unlaunched,
Waiting,
Complete
};
LaunchPhase mLaunchPhase;
UniquePtr<GPUChild> mGPUChild;
uint64_t mProcessToken;
bool mShutdownRequested;
bool mChannelClosed;
TimeStamp mLaunchTime;
};
} // namespace gfx
} // namespace mozilla
#endif // _include_mozilla_gfx_ipc_GPUProcessHost_h_
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