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task: add task_set_rate()

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This commit is contained in:
Steffen Vogel 2017-09-05 16:41:05 +02:00
parent edd0c63d13
commit e7cbdf694e
2 changed files with 31 additions and 18 deletions
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2
include/villas/task.h
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@ -64,6 +64,8 @@ int task_destroy(struct task *t);
*/
uint64_t task_wait_until_next_period(struct task *t);
int task_set_rate(struct task *t, double rate);
/** Wait until a fixed time in the future is reached
*
* @param until A pointer to a time in the future.

25
lib/task.c
View file

@ -35,7 +35,25 @@
int task_init(struct task *t, double rate, int clock)
{
int ret;
t->clock = clock;
#if PERIODIC_TASK_IMPL == TIMERFD
t->fd = timerfd_create(t->clock, 0);
if (t->fd < 0)
return -1;
#endif
ret = task_set_rate(t, rate);
if (ret)
return ret;
return 0;
}
int task_set_rate(struct task *t, double rate)
{
t->period = rate ? time_from_double(1.0 / rate) : (struct timespec) { 0, 0 };
#if PERIODIC_TASK_IMPL == CLOCK_NANOSLEEP || PERIODIC_TASK_IMPL == NANOSLEEP
@ -46,21 +64,14 @@ int task_init(struct task *t, double rate, int clock)
t->next_period = time_add(&now, &t->period);
#elif PERIODIC_TASK_IMPL == TIMERFD
int ret;
struct itimerspec its = {
.it_interval = t->period,
.it_value = t->period
};
t->fd = timerfd_create(t->clock, 0);
if (t->fd < 0)
return -1;
ret = timerfd_settime(t->fd, 0, &its, NULL);
if (ret)
return ret;
#else
#error "Invalid period task implementation"
#endif
return 0;