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/**
* File: CondWait.cc
* Project: libvdr - classes taken from vdr-project
*
* from "Video Disk Recorder":
*
* Copyright (C) 2000, 2003, 2006, 2008 Klaus Schmidinger
*
* This program 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 program 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 program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
* Or, point your browser to http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
*
* The original author can be reached at kls@tvdr.de
*
* The vdr project's page is at http://www.tvdr.de
*
*/
#include <CondWait.h>
#include <sys/time.h>
#include <sys/wait.h>
#include <sys/prctl.h>
#include <errno.h>
#include <tools.h>
static bool GetAbsTime(struct timespec *Abstime, int MillisecondsFromNow)
{
struct timeval now;
if (gettimeofday(&now, NULL) == 0) { // get current time
now.tv_sec += MillisecondsFromNow / 1000; // add full seconds
now.tv_usec += (MillisecondsFromNow % 1000) * 1000; // add microseconds
if (now.tv_usec >= 1000000) { // take care of an overflow
now.tv_sec++;
now.tv_usec -= 1000000;
}
Abstime->tv_sec = now.tv_sec; // seconds
Abstime->tv_nsec = now.tv_usec * 1000; // nano seconds
return true;
}
return false;
}
cCondWait::cCondWait(void)
{
signaled = false;
pthread_mutex_init(&mutex, NULL);
pthread_cond_init(&cond, NULL);
}
cCondWait::~cCondWait()
{
pthread_cond_broadcast(&cond); // wake up any sleepers
pthread_cond_destroy(&cond);
pthread_mutex_destroy(&mutex);
}
void cCondWait::SleepMs(int TimeoutMs)
{
cCondWait w;
w.Wait(max(TimeoutMs, 3)); // making sure the time is >2ms to avoid a possible busy wait
}
bool cCondWait::Wait(int TimeoutMs)
{
pthread_mutex_lock(&mutex);
if (!signaled) {
if (TimeoutMs) {
struct timespec abstime;
if (GetAbsTime(&abstime, TimeoutMs)) {
while (!signaled) {
if (pthread_cond_timedwait(&cond, &mutex, &abstime) == ETIMEDOUT)
break;
}
}
}
else
pthread_cond_wait(&cond, &mutex);
}
bool r = signaled;
signaled = false;
pthread_mutex_unlock(&mutex);
return r;
}
void cCondWait::Signal(void)
{
pthread_mutex_lock(&mutex);
signaled = true;
pthread_cond_broadcast(&cond);
pthread_mutex_unlock(&mutex);
}
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