mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-03 02:25:34 +00:00
67 lines
2.3 KiB
C++
67 lines
2.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* vim:set ts=2 sw=2 sts=2 et cindent: */
|
|
/* 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/. */
|
|
|
|
#ifndef PollableEvent_h__
|
|
#define PollableEvent_h__
|
|
|
|
#include "mozilla/Mutex.h"
|
|
#include "mozilla/TimeStamp.h"
|
|
|
|
namespace mozilla {
|
|
namespace net {
|
|
|
|
// class must be called locked
|
|
class PollableEvent
|
|
{
|
|
public:
|
|
PollableEvent();
|
|
~PollableEvent();
|
|
|
|
// Signal/Clear return false only if they fail
|
|
bool Signal();
|
|
// This is called only when we get non-null out_flags for the socket pair
|
|
bool Clear();
|
|
bool Valid() { return mWriteFD && mReadFD; }
|
|
|
|
// We want to detect if writing to one of the socket pair sockets takes
|
|
// too long to be received by the other socket from the pair.
|
|
// Hence, we remember the timestamp of the earliest write by a call to
|
|
// MarkFirstSignalTimestamp() from Signal(). After waking up from poll()
|
|
// we check how long it took get the 'readable' signal on the socket pair.
|
|
void MarkFirstSignalTimestamp();
|
|
// Called right before we enter poll() to exclude any possible delay between
|
|
// the earlist call to Signal() and entering poll() caused by processing
|
|
// of events dispatched to the socket transport thread.
|
|
void AdjustFirstSignalTimestamp();
|
|
// This returns false on following conditions:
|
|
// - PR_Write has failed
|
|
// - no out_flags were signalled on the socket pair for too long after
|
|
// the earliest Signal()
|
|
bool IsSignallingAlive(TimeDuration const& timeout);
|
|
|
|
PRFileDesc *PollableFD() { return mReadFD; }
|
|
|
|
private:
|
|
PRFileDesc *mWriteFD;
|
|
PRFileDesc *mReadFD;
|
|
bool mSignaled;
|
|
// true when PR_Write to the socket pair has failed (status < 1)
|
|
bool mWriteFailed;
|
|
// Set true after AdjustFirstSignalTimestamp() was called
|
|
// Set false after Clear() was called
|
|
// Ensures shifting the timestamp before entering poll() only once
|
|
// between Clear()'ings.
|
|
bool mSignalTimestampAdjusted;
|
|
// Timestamp of the first call to Signal() (or time we enter poll())
|
|
// that happened after the last Clear() call
|
|
TimeStamp mFirstSignalAfterClear;
|
|
};
|
|
|
|
} // namespace net
|
|
} // namespace mozilla
|
|
|
|
#endif
|