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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
* Copyright 2016-2024 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
// -=- Timer.cxx
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <sys/time.h>
#include <algorithm>
#include <rfb/Timer.h>
#include <rfb/util.h>
#include <rfb/LogWriter.h>
using namespace rfb;
#ifndef __NO_DEFINE_VLOG__
static LogWriter vlog("Timer");
#endif
// Millisecond timeout processing helper functions
inline static timeval addMillis(timeval inTime, int millis) {
int secs = millis / 1000;
millis = millis % 1000;
inTime.tv_sec += secs;
inTime.tv_usec += millis * 1000;
if (inTime.tv_usec >= 1000000) {
inTime.tv_sec++;
inTime.tv_usec -= 1000000;
}
return inTime;
}
inline static int diffTimeMillis(timeval later, timeval earlier) {
long udiff;
udiff = ((later.tv_sec - earlier.tv_sec) * 1000000) +
(later.tv_usec - earlier.tv_usec);
return (udiff + 999) / 1000;
}
std::list<Timer*> Timer::pending;
int Timer::checkTimeouts() {
timeval start;
if (pending.empty())
return -1;
gettimeofday(&start, nullptr);
while (pending.front()->isBefore(start)) {
Timer* timer;
timer = pending.front();
pending.pop_front();
timer->lastDueTime = timer->dueTime;
timer->cb->handleTimeout(timer);
if (pending.empty())
return -1;
}
return getNextTimeout();
}
int Timer::getNextTimeout() {
timeval now;
gettimeofday(&now, nullptr);
if (pending.empty())
return -1;
int toWait = pending.front()->getRemainingMs();
if (toWait > pending.front()->timeoutMs) {
if (toWait - pending.front()->timeoutMs < 1000) {
vlog.info("gettimeofday is broken...");
return toWait;
}
// Time has jumped backwards!
vlog.info("time has moved backwards!");
pending.front()->dueTime = now;
toWait = 0;
}
return toWait;
}
void Timer::insertTimer(Timer* t) {
std::list<Timer*>::iterator i;
for (i=pending.begin(); i!=pending.end(); i++) {
if (t->isBefore((*i)->dueTime)) {
pending.insert(i, t);
return;
}
}
pending.push_back(t);
}
void Timer::start(int timeoutMs_) {
timeval now;
gettimeofday(&now, nullptr);
stop();
timeoutMs = timeoutMs_;
dueTime = addMillis(now, timeoutMs);
insertTimer(this);
}
void Timer::repeat(int timeoutMs_) {
timeval now;
gettimeofday(&now, nullptr);
if (isStarted()) {
vlog.error("Incorrectly repeating already running timer");
stop();
}
if (msBetween(&lastDueTime, &dueTime) != 0)
vlog.error("Timer incorrectly modified whilst repeating");
if (timeoutMs_ != -1)
timeoutMs = timeoutMs_;
dueTime = addMillis(lastDueTime, timeoutMs);
if (isBefore(now)) {
// Time has jumped forwards, or we're not getting enough
// CPU time for the timers
dueTime = now;
}
insertTimer(this);
}
void Timer::stop() {
pending.remove(this);
}
bool Timer::isStarted() {
return std::find(pending.begin(), pending.end(),
this) != pending.end();
}
int Timer::getTimeoutMs() {
return timeoutMs;
}
int Timer::getRemainingMs() {
timeval now;
gettimeofday(&now, nullptr);
return __rfbmax(0, diffTimeMillis(dueTime, now));
}
bool Timer::isBefore(timeval other) {
return (dueTime.tv_sec < other.tv_sec) ||
((dueTime.tv_sec == other.tv_sec) &&
(dueTime.tv_usec < other.tv_usec));
}
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