Source code

Revision control

Other Tools

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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 */
#ifndef _include_dom_media_ipc_RDDProcessHost_h_
#define _include_dom_media_ipc_RDDProcessHost_h_
#include "mozilla/UniquePtr.h"
#include "mozilla/ipc/GeckoChildProcessHost.h"
#include "mozilla/ipc/ProtocolUtils.h"
#include "mozilla/media/MediaUtils.h"
namespace mozilla {
namespace ipc {
class SharedPreferenceSerializer;
} // namespace mozilla
class nsITimer;
namespace mozilla {
class RDDChild;
// RDDProcessHost 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 RDDChild.
// RDDProcessHosts are allocated and managed by RDDProcessManager. 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 RDDProcessHost final : public mozilla::ipc::GeckoChildProcessHost {
friend class RDDChild;
class Listener {
// The RDDProcessHost has unexpectedly shutdown or had its connection
// severed. This is not called if an error occurs after calling
// Shutdown().
virtual void OnProcessUnexpectedShutdown(RDDProcessHost* aHost) {}
explicit RDDProcessHost(Listener* listener);
// Launch the subprocess asynchronously. On failure, false is returned.
// Otherwise, true is returned. If succeeded, a follow-up call should be made
// to LaunchPromise() which will return a promise that will be resolved once
// the RDD process has launched and a channel has been established.
// @param aExtraOpts (StringVector)
// Extra options to pass to the subprocess.
bool Launch(StringVector aExtraOpts);
// Return a promise that will be resolved once the process has completed its
// launch. The promise will be immediately resolved if the launch has already
// succeeded.
RefPtr<GenericNonExclusivePromise> LaunchPromise();
// 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 RDDProcessHost.
// 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.
RDDChild* GetActor() const {
return mRDDChild.get();
// Return a unique id for this process, guaranteed not to be shared with any
// past or future instance of RDDProcessHost.
uint64_t GetProcessToken() const;
bool IsConnected() const {
return !!mRDDChild;
// Return the time stamp for when we tried to launch the RDD process.
// This is currently used for Telemetry so that we can determine how
// long RDD 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);
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
// Return the sandbox type to be used with this process type.
static MacSandboxType GetMacSandboxType();
// Called on the main thread with true after a connection has been established
// or false if it failed (including if it failed before the timeout kicked in)
void InitAfterConnect(bool aSucceeded);
// Called on the main thread when the mRDDChild actor is shutting down.
void OnChannelClosed();
// Kill the remote process, triggering IPC shutdown.
void KillHard(const char* aReason);
void DestroyProcess();
#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
static bool sLaunchWithMacSandbox;
// Sandbox the RDD process at launch for all instances
bool IsMacSandboxLaunchEnabled() override { return sLaunchWithMacSandbox; }
// Override so we can turn on RDD process-specific sandbox logging
bool FillMacSandboxInfo(MacSandboxInfo& aInfo) override;
Listener* const mListener;
// All members below are only ever accessed on the main thread.
enum class LaunchPhase { Unlaunched, Waiting, Complete };
LaunchPhase mLaunchPhase = LaunchPhase::Unlaunched;
UniquePtr<RDDChild> mRDDChild;
uint64_t mProcessToken = 0;
UniquePtr<ipc::SharedPreferenceSerializer> mPrefSerializer;
bool mShutdownRequested = false;
bool mChannelClosed = false;
TimeStamp mLaunchTime;
void RejectPromise();
void ResolvePromise();
// Set to true on construction and to false just prior deletion.
// The RDDProcessHost isn't refcounted; so we can capture this by value in
// lambdas along with a strong reference to mLiveToken and check if that value
// is true before accessing "this".
// While a reference to mLiveToken can be taken on any thread; its value can
// only be read on the main thread.
const RefPtr<media::Refcountable<bool>> mLiveToken;
RefPtr<GenericNonExclusivePromise::Private> mLaunchPromise;
bool mLaunchPromiseSettled = false;
// Will be set to true if we've exceeded the allowed startup time or if the
// RDD process as successfully started. This is used to determine if the
// timeout runnable needs to execute code or not.
bool mTimerChecked = false;
} // namespace mozilla
#endif // _include_dom_media_ipc_RDDProcessHost_h_