static void *itimer_thread_func(void *_handle_tick)
{
TickProc handle_tick = _handle_tick;
uint64_t nticks;
int timerfd = -1;
#if defined(USE_TIMERFD_FOR_ITIMER) && USE_TIMERFD_FOR_ITIMER
struct itimerspec it;
it.it_value.tv_sec = TimeToSeconds(itimer_interval);
it.it_value.tv_nsec = TimeToNS(itimer_interval) % 1000000000;
it.it_interval = it.it_value;
timerfd = timerfd_create(CLOCK_MONOTONIC, TFD_CLOEXEC);
if (timerfd == -1) {
sysErrorBelch("timerfd_create");
stg_exit(EXIT_FAILURE);
}
if (!TFD_CLOEXEC) {
fcntl(timerfd, F_SETFD, FD_CLOEXEC);
}
if (timerfd_settime(timerfd, 0, &it, NULL)) {
sysErrorBelch("timerfd_settime");
stg_exit(EXIT_FAILURE);
}
#endif
while (!exited) {
if (USE_TIMERFD_FOR_ITIMER) {
if (read(timerfd, &nticks, sizeof(nticks)) != sizeof(nticks)) {
if (errno != EINTR) {
sysErrorBelch("Itimer: read(timerfd) failed");
}
}
} else {
if (usleep(TimeToUS(itimer_interval)) != 0 && errno != EINTR) {
sysErrorBelch("usleep(TimeToUS(itimer_interval) failed");
}
}
// first try a cheap test
if (stopped) {
ACQUIRE_LOCK(&mutex);
// should we really stop?
if (stopped) {
waitCondition(&start_cond, &mutex);
}
RELEASE_LOCK(&mutex);
} else {
handle_tick(0);
}
}
if (USE_TIMERFD_FOR_ITIMER)
close(timerfd);
closeMutex(&mutex);
closeCondition(&start_cond);
return NULL;
}
int waitForPipeFullyEmpty(int pipe)
{
Spipe *p = checkSpipeData(pipe);
if(!p)
return -1;
waitCondition(p->fully_empty_wid);
return p->seek - p->offset;
}
int waitForPipeReadyWrite(int pipe)
{
Spipe *p = checkSpipeData(pipe);
if(!p)
return -1;
waitCondition(p->ready_write_wid);
return p->seek - p->offset;
}
int waitForPipeFullyFlushed(int pipe)
{
Spipe *p = checkSpipeData(pipe);
if(!p)
return -1;
if(p->seek - p->offset < p->size) {
waitCondition(p->fully_flushed_wid);
}
return p->seek;
}
