gecko-dev/dom/media/GraphRunner.cpp

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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 https://mozilla.org/MPL/2.0/. */
#include "GraphRunner.h"
#include "GraphDriver.h"
#include "MediaStreamGraph.h"
#include "MediaStreamGraphImpl.h"
#include "mozilla/dom/WorkletThread.h"
#include "nsISupportsImpl.h"
#include "prthread.h"
#include "Tracing.h"
#include "audio_thread_priority.h"
namespace mozilla {
static void Start(void* aArg) {
NS_SetCurrentThreadName("GraphRunner");
GraphRunner* th = static_cast<GraphRunner*>(aArg);
th->Run();
}
GraphRunner::GraphRunner(MediaStreamGraphImpl* aGraph)
: mMonitor("GraphRunner::mMonitor"),
mGraph(aGraph),
mStateEnd(0),
mStillProcessing(true),
mThreadState(ThreadState::Wait),
// Note that mThread needs to be initialized last, as it may pre-empt the
// thread running this ctor and enter Run() with uninitialized members.
mThread(PR_CreateThread(PR_SYSTEM_THREAD, &Start, this,
PR_PRIORITY_URGENT, PR_GLOBAL_THREAD,
PR_JOINABLE_THREAD, 0)) {
MOZ_COUNT_CTOR(GraphRunner);
}
GraphRunner::~GraphRunner() {
MOZ_COUNT_DTOR(GraphRunner);
MOZ_ASSERT(mThreadState == ThreadState::Shutdown);
}
void GraphRunner::Shutdown() {
{
MonitorAutoLock lock(mMonitor);
MOZ_ASSERT(mThreadState == ThreadState::Wait);
mThreadState = ThreadState::Shutdown;
mMonitor.Notify();
}
// We need to wait for runner thread shutdown here for the sake of the
// xpcomWillShutdown case, so that the main thread is not shut down before
// cleanup messages are sent for objects destroyed in
// CycleCollectedJSContext shutdown.
PR_JoinThread(mThread);
mThread = nullptr;
}
bool GraphRunner::OneIteration(GraphTime aStateEnd) {
TRACE_AUDIO_CALLBACK();
MonitorAutoLock lock(mMonitor);
MOZ_ASSERT(mThreadState == ThreadState::Wait);
mStateEnd = aStateEnd;
#ifdef DEBUG
if (auto audioDriver = mGraph->CurrentDriver()->AsAudioCallbackDriver()) {
mAudioDriverThreadId = audioDriver->ThreadId();
} else if (auto clockDriver =
mGraph->CurrentDriver()->AsSystemClockDriver()) {
mClockDriverThread = clockDriver->Thread();
} else {
MOZ_CRASH("Unknown GraphDriver");
}
#endif
// Signal that mStateEnd was updated
mThreadState = ThreadState::Run;
mMonitor.Notify();
// Wait for mStillProcessing to update
do {
mMonitor.Wait();
} while (mThreadState == ThreadState::Run);
#ifdef DEBUG
mAudioDriverThreadId = std::thread::id();
mClockDriverThread = nullptr;
#endif
return mStillProcessing;
}
void GraphRunner::Run() {
PR_SetCurrentThreadName("GraphRunner");
atp_handle* handle =
atp_promote_current_thread_to_real_time(0, mGraph->GraphRate());
MonitorAutoLock lock(mMonitor);
while (true) {
while (mThreadState == ThreadState::Wait) {
mMonitor.Wait(); // Wait for mStateEnd to update or for shutdown
}
if (mThreadState == ThreadState::Shutdown) {
break;
}
TRACE();
mStillProcessing = mGraph->OneIterationImpl(mStateEnd);
// Signal that mStillProcessing was updated
mThreadState = ThreadState::Wait;
mMonitor.Notify();
}
if (handle) {
atp_demote_current_thread_from_real_time(handle);
}
dom::WorkletThread::DeleteCycleCollectedJSContext();
}
bool GraphRunner::OnThread() { return PR_GetCurrentThread() == mThread; }
#ifdef DEBUG
bool GraphRunner::RunByGraphDriver(GraphDriver* aDriver) {
if (!OnThread()) {
return false;
}
if (auto audioDriver = aDriver->AsAudioCallbackDriver()) {
return audioDriver->ThreadId() == mAudioDriverThreadId;
}
if (auto clockDriver = aDriver->AsSystemClockDriver()) {
return clockDriver->Thread() == mClockDriverThread;
}
MOZ_CRASH("Unknown driver");
}
#endif
} // namespace mozilla