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/* Copyright (C) 2002-2005 RealVNC Ltd. All Rights Reserved.
*
* 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
#include <stdio.h>
#ifdef WIN32
#ifndef _WIN32_WCE
#include <sys/timeb.h>
#endif
#endif
#include <rfb/Timer.h>
#include <rfb/util.h>
#include <rfb/LogWriter.h>
// XXX Lynx/OS 2.3: proto for gettimeofday()
#ifdef Lynx
#include <sys/proto.h>
#endif
using namespace rfb;
#ifndef __NO_DEFINE_VLOG__
static LogWriter vlog("Timer");
#endif
// Win32 does not provide gettimeofday, so we emulate it to simplify the
// Timer code.
#ifdef _WIN32
static void gettimeofday(struct timeval* tv, void*)
{
LARGE_INTEGER counts, countsPerSec;
static double usecPerCount = 0.0;
if (QueryPerformanceCounter(&counts)) {
if (usecPerCount == 0.0) {
QueryPerformanceFrequency(&countsPerSec);
usecPerCount = 1000000.0 / countsPerSec.QuadPart;
}
LONGLONG usecs = (LONGLONG)(counts.QuadPart * usecPerCount);
tv->tv_usec = (long)(usecs % 1000000);
tv->tv_sec = (long)(usecs / 1000000);
} else {
#ifndef _WIN32_WCE
struct timeb tb;
ftime(&tb);
tv->tv_sec = tb.time;
tv->tv_usec = tb.millitm * 1000;
#else
throw SystemException("QueryPerformanceCounter", GetLastError());
#endif
}
}
#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) {
return ((later.tv_sec - earlier.tv_sec) * 1000) + ((later.tv_usec - earlier.tv_usec) / 1000);
}
std::list<Timer*> Timer::pending;
int Timer::checkTimeouts() {
if (pending.empty())
return 0;
timeval now;
gettimeofday(&now, 0);
while (pending.front()->isBefore(now)) {
Timer* timer = pending.front();
pending.pop_front();
vlog.debug("handleTimeout(%p)", timer);
if (timer->cb->handleTimeout(timer)) {
timer->dueTime = addMillis(timer->dueTime, timer->timeoutMs);
if (timer->isBefore(now)) {
// Time has jumped forwards!
vlog.info("time has moved forwards!");
timer->dueTime = addMillis(now, timer->timeoutMs);
}
insertTimer(timer);
} else if (pending.empty()) {
return 0;
}
}
return getNextTimeout();
}
int Timer::getNextTimeout() {
timeval now;
gettimeofday(&now, 0);
int toWait = __rfbmax(1, diffTimeMillis(pending.front()->dueTime, now));
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 = 1;
}
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, 0);
stop();
timeoutMs = timeoutMs_;
dueTime = addMillis(now, timeoutMs);
insertTimer(this);
}
void Timer::stop() {
pending.remove(this);
}
bool Timer::isStarted() {
std::list<Timer*>::iterator i;
for (i=pending.begin(); i!=pending.end(); i++) {
if (*i == this)
return true;
}
return false;
}
int Timer::getTimeoutMs() {
return timeoutMs;
}
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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