NS_IMETHODIMP
STSThreadPoolListener::OnThreadCreated()
{
if (IsNuwaProcess()) {
NuwaMarkCurrentThread(nullptr, nullptr);
}
return NS_OK;
}
void
ProcessLink::SendMessage(Message *msg)
{
mChan->AssertWorkerThread();
mChan->mMonitor->AssertCurrentThreadOwns();
#ifdef MOZ_NUWA_PROCESS
// Parent to child: check whether we are sending some unexpected message to
// the Nuwa process.
if (mIsToNuwaProcess && mozilla::dom::ContentParent::IsNuwaReady()) {
switch (msg->type()) {
case mozilla::dom::PNuwa::Msg_Fork__ID:
case mozilla::dom::PNuwa::Reply_AddNewProcess__ID:
case mozilla::dom::PContent::Msg_NotifyPhoneStateChange__ID:
case mozilla::dom::PContent::Msg_ActivateA11y__ID:
case mozilla::hal_sandbox::PHal::Msg_NotifyNetworkChange__ID:
case GOODBYE_MESSAGE_TYPE:
break;
default:
#ifdef DEBUG
MOZ_CRASH();
#else
// In optimized build, message will be dropped.
printf_stderr("Sending message to frozen Nuwa");
return;
#endif
}
}
#if defined(DEBUG)
// Nuwa to parent: check whether we are currently blocked.
if (IsNuwaProcess() && mIsBlocked) {
char* jsstack = PrintJSStack();
printf_stderr("Fatal error: sending a message to the chrome process"
"with a blocked IPC channel from \n%s",
jsstack ? jsstack : "<no JS stack>");
JS_smprintf_free(jsstack);
MOZ_CRASH();
}
#endif
#endif
mIOLoop->PostTask(
FROM_HERE,
NewRunnableMethod(mTransport, &Transport::Send, msg));
}
static void
ConnectImageBridgeInChildProcess(Transport* aTransport,
ProcessId aOtherPid)
{
// Bind the IPC channel to the image bridge thread.
sImageBridgeChildSingleton->Open(aTransport, aOtherPid,
XRE_GetIOMessageLoop(),
ipc::ChildSide);
#ifdef MOZ_NUWA_PROCESS
if (IsNuwaProcess()) {
sImageBridgeChildThread
->message_loop()->PostTask(FROM_HERE,
NewRunnableFunction(NuwaMarkCurrentThread,
(void (*)(void *))nullptr,
(void *)nullptr));
}
#endif
}
nsresult
nsStreamTransportService::Init()
{
mPool = do_CreateInstance(NS_THREADPOOL_CONTRACTID);
NS_ENSURE_STATE(mPool);
// Configure the pool
mPool->SetName(NS_LITERAL_CSTRING("StreamTrans"));
mPool->SetThreadLimit(25);
mPool->SetIdleThreadLimit(1);
mPool->SetIdleThreadTimeout(PR_SecondsToInterval(30));
#ifdef MOZ_NUWA_PROCESS
if (IsNuwaProcess()) {
mPool->SetListener(new STSThreadPoolListener());
}
#endif
nsCOMPtr<nsIObserverService> obsSvc =
mozilla::services::GetObserverService();
if (obsSvc)
obsSvc->AddObserver(this, "xpcom-shutdown-threads", false);
return NS_OK;
}
bool
NuwaChild::RecvFork()
{
#ifdef MOZ_NUWA_PROCESS
if (!IsNuwaProcess()) {
NS_ERROR(
nsPrintfCString(
"Terminating child process %d for unauthorized IPC message: "
"RecvFork(%d)", getpid()).get());
return false;
}
nsCOMPtr<nsIRunnable> runnable =
NS_NewRunnableFunction(&NuwaFork);
MOZ_ASSERT(runnable);
MOZ_ALWAYS_TRUE(NS_SUCCEEDED(NS_DispatchToMainThread(runnable)));
return true;
#else
NS_ERROR("NuwaChild::RecvFork() not implemented!");
return false;
#endif
}
void
ProcessLink::Open(mozilla::ipc::Transport* aTransport, MessageLoop *aIOLoop, Side aSide)
{
NS_PRECONDITION(aTransport, "need transport layer");
// FIXME need to check for valid channel
mTransport = aTransport;
// FIXME figure out whether we're in parent or child, grab IO loop
// appropriately
bool needOpen = true;
if(aIOLoop) {
// We're a child or using the new arguments. Either way, we
// need an open.
needOpen = true;
mChan->mSide = (aSide == UnknownSide) ? ChildSide : aSide;
} else {
NS_PRECONDITION(aSide == UnknownSide, "expected default side arg");
// parent
mChan->mSide = ParentSide;
needOpen = false;
aIOLoop = XRE_GetIOMessageLoop();
}
mIOLoop = aIOLoop;
NS_ASSERTION(mIOLoop, "need an IO loop");
NS_ASSERTION(mChan->mWorkerLoop, "need a worker loop");
{
MonitorAutoLock lock(*mChan->mMonitor);
if (needOpen) {
// Transport::Connect() has not been called. Call it so
// we start polling our pipe and processing outgoing
// messages.
mIOLoop->PostTask(
FROM_HERE,
NewRunnableMethod(this, &ProcessLink::OnChannelOpened));
} else {
// Transport::Connect() has already been called. Take
// over the channel from the previous listener and process
// any queued messages.
mIOLoop->PostTask(
FROM_HERE,
NewRunnableMethod(this, &ProcessLink::OnTakeConnectedChannel));
}
#ifdef MOZ_NUWA_PROCESS
if (IsNuwaProcess() &&
Preferences::GetBool("dom.ipc.processPrelaunch.testMode")) {
// The pref value is turned on in a deadlock test against the Nuwa
// process. The sleep here makes it easy to trigger the deadlock
// that an IPC channel is still opening but the worker loop is
// already frozen.
sleep(5);
}
#endif
// Should not wait here if something goes wrong with the channel.
while (!mChan->Connected() && mChan->mChannelState != ChannelError) {
mChan->mMonitor->Wait();
}
}
}
NS_IMETHODIMP
nsSocketTransportService::Run()
{
#ifdef MOZ_NUWA_PROCESS
if (IsNuwaProcess()) {
NuwaMarkCurrentThread(nullptr, nullptr);
}
#endif
SOCKET_LOG(("STS thread init %d sockets\n", gMaxCount));
psm::InitializeSSLServerCertVerificationThreads();
gSocketThread = PR_GetCurrentThread();
{
DebugMutexAutoLock lock(mLock);
mPollableEvent.reset(new PollableEvent());
//
// NOTE: per bug 190000, this failure could be caused by Zone-Alarm
// or similar software.
//
// NOTE: per bug 191739, this failure could also be caused by lack
// of a loopback device on Windows and OS/2 platforms (it creates
// a loopback socket pair on these platforms to implement a pollable
// event object). if we can't create a pollable event, then we'll
// have to "busy wait" to implement the socket event queue :-(
//
if (!mPollableEvent->Valid()) {
mPollableEvent = nullptr;
NS_WARNING("running socket transport thread without a pollable event");
SOCKET_LOG(("running socket transport thread without a pollable event"));
}
mPollList[0].fd = mPollableEvent ? mPollableEvent->PollableFD() : nullptr;
mPollList[0].in_flags = PR_POLL_READ | PR_POLL_EXCEPT;
mPollList[0].out_flags = 0;
}
mRawThread = NS_GetCurrentThread();
// hook ourselves up to observe event processing for this thread
nsCOMPtr<nsIThreadInternal> threadInt = do_QueryInterface(mRawThread);
threadInt->SetObserver(this);
// make sure the pseudo random number generator is seeded on this thread
srand(static_cast<unsigned>(PR_Now()));
// For the calculation of the duration of the last cycle (i.e. the last for-loop
// iteration before shutdown).
TimeStamp startOfCycleForLastCycleCalc;
int numberOfPendingEventsLastCycle;
// For measuring of the poll iteration duration without time spent blocked
// in poll().
TimeStamp pollCycleStart;
// Time blocked in poll().
TimeDuration singlePollDuration;
// For calculating the time needed for a new element to run.
TimeStamp startOfIteration;
TimeStamp startOfNextIteration;
int numberOfPendingEvents;
// If there is too many pending events queued, we will run some poll()
// between them and the following variable is cumulative time spent
// blocking in poll().
TimeDuration pollDuration;
for (;;) {
bool pendingEvents = false;
numberOfPendingEvents = 0;
numberOfPendingEventsLastCycle = 0;
if (mTelemetryEnabledPref) {
startOfCycleForLastCycleCalc = TimeStamp::NowLoRes();
startOfNextIteration = TimeStamp::NowLoRes();
}
pollDuration = 0;
do {
if (mTelemetryEnabledPref) {
pollCycleStart = TimeStamp::NowLoRes();
}
DoPollIteration(&singlePollDuration);
if (mTelemetryEnabledPref && !pollCycleStart.IsNull()) {
Telemetry::Accumulate(Telemetry::STS_POLL_BLOCK_TIME,
singlePollDuration.ToMilliseconds());
Telemetry::AccumulateTimeDelta(
Telemetry::STS_POLL_CYCLE,
pollCycleStart + singlePollDuration,
TimeStamp::NowLoRes());
pollDuration += singlePollDuration;
}
mRawThread->HasPendingEvents(&pendingEvents);
if (pendingEvents) {
if (!mServingPendingQueue) {
nsresult rv = Dispatch(NewRunnableMethod(this,
&nsSocketTransportService::MarkTheLastElementOfPendingQueue),
nsIEventTarget::DISPATCH_NORMAL);
if (NS_FAILED(rv)) {
NS_WARNING("Could not dispatch a new event on the "
"socket thread.");
} else {
mServingPendingQueue = true;
}
if (mTelemetryEnabledPref) {
startOfIteration = startOfNextIteration;
// Everything that comes after this point will
// be served in the next iteration. If no even
// arrives, startOfNextIteration will be reset at the
// beginning of each for-loop.
startOfNextIteration = TimeStamp::NowLoRes();
}
}
TimeStamp eventQueueStart = TimeStamp::NowLoRes();
do {
NS_ProcessNextEvent(mRawThread);
numberOfPendingEvents++;
pendingEvents = false;
mRawThread->HasPendingEvents(&pendingEvents);
} while (pendingEvents && mServingPendingQueue &&
((TimeStamp::NowLoRes() -
eventQueueStart).ToMilliseconds() <
mMaxTimePerPollIter));
if (mTelemetryEnabledPref && !mServingPendingQueue &&
!startOfIteration.IsNull()) {
Telemetry::AccumulateTimeDelta(
Telemetry::STS_POLL_AND_EVENTS_CYCLE,
startOfIteration + pollDuration,
TimeStamp::NowLoRes());
Telemetry::Accumulate(
Telemetry::STS_NUMBER_OF_PENDING_EVENTS,
numberOfPendingEvents);
numberOfPendingEventsLastCycle += numberOfPendingEvents;
numberOfPendingEvents = 0;
pollDuration = 0;
}
}
} while (pendingEvents);
bool goingOffline = false;
// now that our event queue is empty, check to see if we should exit
{
DebugMutexAutoLock lock(mLock);
if (mShuttingDown) {
if (mTelemetryEnabledPref &&
!startOfCycleForLastCycleCalc.IsNull()) {
Telemetry::Accumulate(
Telemetry::STS_NUMBER_OF_PENDING_EVENTS_IN_THE_LAST_CYCLE,
numberOfPendingEventsLastCycle);
Telemetry::AccumulateTimeDelta(
Telemetry::STS_POLL_AND_EVENT_THE_LAST_CYCLE,
startOfCycleForLastCycleCalc,
TimeStamp::NowLoRes());
}
break;
}
if (mGoingOffline) {
mGoingOffline = false;
goingOffline = true;
}
}
// Avoid potential deadlock
if (goingOffline)
Reset(true);
}
SOCKET_LOG(("STS shutting down thread\n"));
// detach all sockets, including locals
Reset(false);
// Final pass over the event queue. This makes sure that events posted by
// socket detach handlers get processed.
NS_ProcessPendingEvents(mRawThread);
gSocketThread = nullptr;
psm::StopSSLServerCertVerificationThreads();
SOCKET_LOG(("STS thread exit\n"));
return NS_OK;
}
void
ClosingService::ThreadFunc()
{
PR_SetCurrentThreadName("Closing Service");
#ifdef MOZ_NUWA_PROCESS
if (IsNuwaProcess()) {
NuwaMarkCurrentThread(nullptr, nullptr);
}
#endif
for (;;) {
PRFileDesc *fd;
{
mozilla::MonitorAutoLock mon(mMonitor);
while (!mShutdown && (mQueue.Length() == 0)) {
mon.Wait();
}
if (mShutdown) {
// If we are in shutdown leak the rest of the sockets.
for (uint32_t i = 0; i < mQueue.Length(); i++) {
fd = mQueue[i];
// If the ClosingService layer is the first layer above
// PR_NSPR_IO_LAYER we are not going to leak anything, but PR_Close
// will not be called.
PR_Free(fd);
}
mQueue.Clear();
return;
}
fd = mQueue[0];
mQueue.RemoveElementAt(0);
}
// Leave lock before closing socket. It can block for a long time and in
// case we accidentally attach this layer twice this would cause deadlock.
bool tcp = (PR_GetDescType(PR_GetIdentitiesLayer(fd, PR_NSPR_IO_LAYER)) ==
PR_DESC_SOCKET_TCP);
PRIntervalTime closeStarted = PR_IntervalNow();
fd->methods->close(fd);
// Post telemetry.
if (tcp) {
SendPRCloseTelemetry(closeStarted,
Telemetry::PRCLOSE_TCP_BLOCKING_TIME_NORMAL,
Telemetry::PRCLOSE_TCP_BLOCKING_TIME_SHUTDOWN,
Telemetry::PRCLOSE_TCP_BLOCKING_TIME_CONNECTIVITY_CHANGE,
Telemetry::PRCLOSE_TCP_BLOCKING_TIME_LINK_CHANGE,
Telemetry::PRCLOSE_TCP_BLOCKING_TIME_OFFLINE);
} else {
SendPRCloseTelemetry(closeStarted,
Telemetry::PRCLOSE_UDP_BLOCKING_TIME_NORMAL,
Telemetry::PRCLOSE_UDP_BLOCKING_TIME_SHUTDOWN,
Telemetry::PRCLOSE_UDP_BLOCKING_TIME_CONNECTIVITY_CHANGE,
Telemetry::PRCLOSE_UDP_BLOCKING_TIME_LINK_CHANGE,
Telemetry::PRCLOSE_UDP_BLOCKING_TIME_OFFLINE);
}
}
}
void
ThreadMain(void*)
{
PR_SetCurrentThreadName("Hang Monitor");
#ifdef MOZ_NUWA_PROCESS
if (IsNuwaProcess()) {
NuwaMarkCurrentThread(nullptr, nullptr);
}
#endif
MonitorAutoLock lock(*gMonitor);
// In order to avoid issues with the hang monitor incorrectly triggering
// during a general system stop such as sleeping, the monitor thread must
// run twice to trigger hang protection.
PRIntervalTime lastTimestamp = 0;
int waitCount = 0;
#ifdef REPORT_CHROME_HANGS
Telemetry::ProcessedStack stack;
int32_t systemUptime = -1;
int32_t firefoxUptime = -1;
UniquePtr<HangAnnotations> annotations;
#endif
while (true) {
if (gShutdown) {
return; // Exit the thread
}
// avoid rereading the volatile value in this loop
PRIntervalTime timestamp = gTimestamp;
PRIntervalTime now = PR_IntervalNow();
if (timestamp != PR_INTERVAL_NO_WAIT &&
now < timestamp) {
// 32-bit overflow, reset for another waiting period
timestamp = 1; // lowest legal PRInterval value
}
if (timestamp != PR_INTERVAL_NO_WAIT &&
timestamp == lastTimestamp &&
gTimeout > 0) {
++waitCount;
#ifdef REPORT_CHROME_HANGS
// Capture the chrome-hang stack + Firefox & system uptimes after
// the minimum hang duration has been reached (not when the hang ends)
if (waitCount == 2) {
GetChromeHangReport(stack, systemUptime, firefoxUptime);
annotations = ChromeHangAnnotatorCallout();
}
#else
// This is the crash-on-hang feature.
// See bug 867313 for the quirk in the waitCount comparison
if (waitCount >= 2) {
int32_t delay =
int32_t(PR_IntervalToSeconds(now - timestamp));
if (delay >= gTimeout) {
MonitorAutoUnlock unlock(*gMonitor);
Crash();
}
}
#endif
} else {
#ifdef REPORT_CHROME_HANGS
if (waitCount >= 2) {
uint32_t hangDuration = PR_IntervalToSeconds(now - lastTimestamp);
Telemetry::RecordChromeHang(hangDuration, stack, systemUptime,
firefoxUptime, Move(annotations));
stack.Clear();
}
#endif
lastTimestamp = timestamp;
waitCount = 0;
}
PRIntervalTime timeout;
if (gTimeout <= 0) {
timeout = PR_INTERVAL_NO_TIMEOUT;
} else {
timeout = PR_MillisecondsToInterval(gTimeout * 500);
}
lock.Wait(timeout);
}
}