1 files changed, 146 insertions, 0 deletions
diff --git a/gfx/ipc/GPUProcessHost.h b/gfx/ipc/GPUProcessHost.h
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+++ b/gfx/ipc/GPUProcessHost.h
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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_