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dmeventd: enhance time waiting loop

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dmeventd is 'scanning' statuses in loop (most usually in 10sec
intervals) - and meanwhile it sleeps within:
pthread_cond_timedwait()

However this function call tends to wakeup sometimes a short amount of
time sooner - and our code still believe the 'right time' has not yet
arrived and basically for a moment 'busy-looped' on calling this
function - so for systems with 'clock_gettime()' present we obtain
time and we go 10ms to the future second - this avoids unneeded
repeated invocation of our time scheduling loop.

TODO: monitoring during 1 hour 'time-change'...
This commit is contained in:
Zdenek Kabelac 2020-03-04 15:56:09 +01:00
parent caecbcbeac
commit 212cf8efbd
1 changed files with 10 additions and 1 deletions
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11
daemons/dmeventd/dmeventd.c
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@ -752,7 +752,7 @@ static void _exit_timeout(void *unused __attribute__((unused)))
static void *_timeout_thread(void *unused __attribute__((unused)))
{
struct thread_status *thread;
struct timespec timeout;
struct timespec timeout, real_time;
time_t curr_time;
int ret;
@ -763,7 +763,16 @@ static void *_timeout_thread(void *unused __attribute__((unused)))
while (!dm_list_empty(&_timeout_registry)) {
timeout.tv_sec = 0;
timeout.tv_nsec = 0;
#ifndef HAVE_REALTIME
curr_time = time(NULL);
#else
if (clock_gettime(CLOCK_REALTIME, &real_time)) {
log_error("Failed to read clock_gettime().");
break;
}
/* 10ms back to the future */
curr_time = real_time.tv_sec + ((real_time.tv_nsec > (1000000000 - 10000000)) ? 1 : 0);
#endif
dm_list_iterate_items_gen(thread, &_timeout_registry, timeout_list) {
if (thread->next_time <= curr_time) {