NS_IMETHODIMP
nsSocketTransportService::OnProcessNextEvent(nsIThreadInternal *thread,
PRBool mayWait, PRUint32 depth)
{
// DoPollIteration doesn't support being called recursively. This case
// should only happen when someone (e.g., PSM) is issuing a synchronous
// proxy call from this thread to the main thread.
if (depth > 1)
return NS_OK;
// Favor processing existing sockets before other events.
DoPollIteration(PR_FALSE);
PRBool val;
while (mayWait && NS_SUCCEEDED(thread->HasPendingEvents(&val)) && !val)
DoPollIteration(PR_TRUE);
return NS_OK;
}
NS_IMETHODIMP
nsSocketTransportService::Run()
{
SOCKET_LOG(("STS thread init %d sockets\n", gMaxCount));
psm::InitializeSSLServerCertVerificationThreads();
gSocketThread = PR_GetCurrentThread();
{
MutexAutoLock 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
{
MutexAutoLock 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;
}
