Hi,
I got the following problem with ev_is_active():
I got a ev_timer, and it gets started, then something which takes a lot
of time happens, and I'd stop the timer if ev_is_active claims the timer
is still active.
But, ev_is_active reports the timer is not active, I do not disable the
timer, and the timers callback gets fired afterwards.
Thats the problem.
ev_is_active reports the timer is inactive, and the callback gets fired.
Sounds scary, yes.
I used gdb to verify:
ev_is_active is false:
(gdb) p con->events.dns_timeout
$6 = {active = 0, pending = 1, priority = 0, data = 0x9a2b8c8, cb =
0x805a410 <the_cb>,
at = -3.4154873266816139, repeat = 0}
but later on, the callback fires:
(gdb) p con->events.dns_timeout
$7 = {active = 0, pending = 0, priority = 0, data = 0x9a2b8c8, cb =
0x805a410 <the_cb>,
at = -3.4154873266816139, repeat = 0}
I noticed the 'pending' field, so when is a not repeating ev_timer inactive?
If I ask to disable an ev_timer in the same ev_loop iteration which
would fire the callback (ev_timer.pending = 1), is the
ev_is_active(ev_timer) meant to be true or false?
I'd expect it to be true - as I did not call ev_timer_stop on it yet,
and the callback did not come in yet, but I think I'm wrong.
Attached is a sample program, t1_cb is expected to stop t2, so t2_cb
never gets called, but t2_cb is called always.
./timertest
called t1_cb loop 0x7fd720899200 w 0x601100 revents 256
called t2_cb loop 0x7fd720899200 w 0x601080 revents 256
Thanks,
Markus
/*
gcc -Wall -o timertest timertest.c -lev
*/
#include <stdio.h>
#include <unistd.h>
#include <ev.h>
#include <time.h>
struct ev_timer t1;
struct ev_timer t2;
struct ev_signal s1;
void waste(time_t s)
{
time_t now = time(NULL);
int i = 0;
while((now + s) > time(NULL))
i++;
}
void t1_cb(struct ev_loop *loop, struct ev_timer *w, int revents)
{
printf("called %s loop %p w %p revents %i\n", __PRETTY_FUNCTION__, loop, w, revents);
if( ev_is_active(&t2) )
{
printf("stopping t2\n");
ev_timer_stop(loop, &t2);
}
}
void t2_cb(struct ev_loop *loop, struct ev_timer *w, int revents)
{
printf("called %s loop %p w %p revents %i\n", __PRETTY_FUNCTION__, loop, w, revents);
}
int main()
{
struct ev_loop *loop = ev_default_loop (0);
ev_timer_init(&t1, t1_cb, 1.0, 0);
ev_timer_init(&t2, t2_cb, 5.0, 0);
ev_timer_start(loop, &t1);
ev_timer_start(loop, &t2);
waste(6);
ev_loop (loop, 0);
return 0;
}
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