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/* -*- 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 http://mozilla.org/MPL/2.0/. */
#include "VRProcessParent.h"
#include "VRGPUChild.h"
#include "VRProcessManager.h"
#include "mozilla/dom/ContentParent.h"
#include "mozilla/dom/MemoryReportRequest.h"
#include "mozilla/gfx/GPUProcessManager.h"
#include "mozilla/gfx/GPUChild.h"
#include "mozilla/ipc/Endpoint.h"
#include "mozilla/ipc/ProcessChild.h"
#include "mozilla/ipc/ProcessUtils.h"
#include "mozilla/ipc/ProtocolTypes.h"
#include "mozilla/ipc/ProtocolUtils.h" // for IToplevelProtocol
#include "mozilla/Preferences.h"
#include "mozilla/StaticPrefs_dom.h"
#include "mozilla/TimeStamp.h" // for TimeStamp
#include "mozilla/Unused.h"
#include "VRChild.h"
#include "VRThread.h"
#include "nsAppRunner.h" // for IToplevelProtocol
using std::string;
using std::vector;
using namespace mozilla::ipc;
namespace mozilla {
namespace gfx {
VRProcessParent::VRProcessParent(Listener* aListener)
: GeckoChildProcessHost(GeckoProcessType_VR),
mTaskFactory(this),
mListener(aListener),
mLaunchPhase(LaunchPhase::Unlaunched),
mChannelClosed(false),
mShutdownRequested(false) {
MOZ_COUNT_CTOR(VRProcessParent);
}
VRProcessParent::~VRProcessParent() { MOZ_COUNT_DTOR(VRProcessParent); }
bool VRProcessParent::Launch() {
MOZ_ASSERT(mLaunchPhase == LaunchPhase::Unlaunched);
MOZ_ASSERT(!mVRChild);
mLaunchThread = NS_GetCurrentThread();
mLaunchPhase = LaunchPhase::Waiting;
std::vector<std::string> extraArgs;
ProcessChild::AddPlatformBuildID(extraArgs);
mPrefSerializer = MakeUnique<ipc::SharedPreferenceSerializer>();
if (!mPrefSerializer->SerializeToSharedMemory(GeckoProcessType_VR,
/* remoteType */ ""_ns)) {
return false;
}
mPrefSerializer->AddSharedPrefCmdLineArgs(*this, extraArgs);
if (!GeckoChildProcessHost::AsyncLaunch(extraArgs)) {
mLaunchPhase = LaunchPhase::Complete;
mPrefSerializer = nullptr;
return false;
}
return true;
}
bool VRProcessParent::WaitForLaunch() {
if (mLaunchPhase == LaunchPhase::Complete) {
return !!mVRChild;
}
int32_t timeoutMs =
StaticPrefs::dom_vr_process_startup_timeout_ms_AtStartup();
// If one of the following environment variables are set we can effectively
// ignore the timeout - as we can guarantee the compositor process will be
// terminated
if (PR_GetEnv("MOZ_DEBUG_CHILD_PROCESS") ||
PR_GetEnv("MOZ_DEBUG_CHILD_PAUSE")) {
timeoutMs = 0;
}
// Our caller expects the connection to be finished after we return, so we
// immediately set up the IPDL actor and fire callbacks. The IO thread will
// still dispatch a notification to the main thread - we'll just ignore it.
bool result = GeckoChildProcessHost::WaitUntilConnected(timeoutMs);
result &= InitAfterConnect(result);
return result;
}
void VRProcessParent::Shutdown() {
MOZ_ASSERT(!mShutdownRequested);
mListener = nullptr;
if (mVRChild) {
// The channel might already be closed if we got here unexpectedly.
if (!mChannelClosed) {
mVRChild->Close();
}
// OnChannelClosed uses this to check if the shutdown was expected or
// unexpected.
mShutdownRequested = true;
#ifndef NS_FREE_PERMANENT_DATA
// No need to communicate shutdown, the VR process doesn't need to
// communicate anything back.
KillHard("NormalShutdown");
#endif
// If we're shutting down unexpectedly, we're in the middle of handling an
// ActorDestroy for PVRChild, which is still on the stack. We'll return
// back to OnChannelClosed.
//
// Otherwise, we'll wait for OnChannelClose to be called whenever PVRChild
// acknowledges shutdown.
return;
}
DestroyProcess();
}
void VRProcessParent::DestroyProcess() {
if (mLaunchThread) {
// Cancel all tasks. We don't want anything triggering after our caller
// expects this to go away.
{
MonitorAutoLock lock(mMonitor);
mTaskFactory.RevokeAll();
}
mLaunchThread->Dispatch(NS_NewRunnableFunction("DestroyProcessRunnable",
[this] { Destroy(); }));
}
}
bool VRProcessParent::InitAfterConnect(bool aSucceeded) {
MOZ_ASSERT(mLaunchPhase == LaunchPhase::Waiting);
MOZ_ASSERT(!mVRChild);
mLaunchPhase = LaunchPhase::Complete;
mPrefSerializer = nullptr;
if (aSucceeded) {
GPUChild* gpuChild = GPUProcessManager::Get()->GetGPUChild();
if (!gpuChild) {
NS_WARNING(
"GPU process haven't connected with the parent process yet"
"when creating VR process.");
return false;
}
if (!StaticPrefs::dom_vr_enabled() &&
!StaticPrefs::dom_vr_webxr_enabled()) {
NS_WARNING("VR is not enabled when trying to create a VRChild");
return false;
}
mVRChild = MakeUnique<VRChild>(this);
DebugOnly<bool> rv = TakeInitialEndpoint().Bind(mVRChild.get());
MOZ_ASSERT(rv);
mVRChild->Init();
if (mListener) {
mListener->OnProcessLaunchComplete(this);
}
// Make vr-gpu process connection
Endpoint<PVRGPUChild> vrGPUBridge;
VRProcessManager* vpm = VRProcessManager::Get();
DebugOnly<bool> opened =
vpm->CreateGPUBridges(gpuChild->OtherPid(), &vrGPUBridge);
MOZ_ASSERT(opened);
Unused << gpuChild->SendInitVR(std::move(vrGPUBridge));
}
return true;
}
void VRProcessParent::KillHard(const char* aReason) {
ProcessHandle handle = GetChildProcessHandle();
if (!base::KillProcess(handle, base::PROCESS_END_KILLED_BY_USER)) {
NS_WARNING("failed to kill subprocess!");
}
SetAlreadyDead();
}
void VRProcessParent::OnChannelError() {
MOZ_ASSERT(false, "VR process channel error.");
}
void VRProcessParent::OnChannelConnected(base::ProcessId peer_pid) {
MOZ_ASSERT(!NS_IsMainThread());
GeckoChildProcessHost::OnChannelConnected(peer_pid);
// Post a task to the main thread. Take the lock because mTaskFactory is not
// thread-safe.
RefPtr<Runnable> runnable;
{
MonitorAutoLock lock(mMonitor);
runnable = mTaskFactory.NewRunnableMethod(
&VRProcessParent::OnChannelConnectedTask);
}
NS_DispatchToMainThread(runnable);
}
void VRProcessParent::OnChannelConnectedTask() {
if (mLaunchPhase == LaunchPhase::Waiting) {
InitAfterConnect(true);
}
}
void VRProcessParent::OnChannelErrorTask() {
if (mLaunchPhase == LaunchPhase::Waiting) {
InitAfterConnect(false);
}
}
void VRProcessParent::OnChannelClosed() {
mChannelClosed = true;
if (!mShutdownRequested && mListener) {
// This is an unclean shutdown. Notify we're going away.
mListener->OnProcessUnexpectedShutdown(this);
} else {
DestroyProcess();
}
// Release the actor.
VRChild::Destroy(std::move(mVRChild));
MOZ_ASSERT(!mVRChild);
}
base::ProcessId VRProcessParent::OtherPid() { return mVRChild->OtherPid(); }
bool VRProcessParent::IsConnected() const { return !!mVRChild; }
} // namespace gfx
} // namespace mozilla
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