Hi all,
I'm just getting started with libevent and I was wondering how I might
implement a simple deadline timer with it.
I'd like to be able to use do something like:
void do_something(...) ...
deadline_timer_wait(5, do_something); /* _non-blocking_, call
do_something() in 5 seconds */
... perhaps less than 5 seconds later ...
deadline_timer_nevermind(); /* whatever we're waiting on, stop
waiting, don't call do_something() */
However I'm a bit confused as to how event_dispatch() is supposed to
work. Do I need to fork and then have the child call event_dispatch()
in a loop:
...
struct event_base* current_base;
struct event ev;
pid_t pid;
current_base = event_init();
if ((pid = fork()) == 0) {
if (event_reinit(current_base) == -1) {
fprintf (stderr, "FAILED (reinit)");
exit(1);
}
while (true) {
event_dispatch();
}
}
...
timeout_set(&ev, do_something, 0);
...
/* Then, whenever I want to start a deadline timer for calling
do_something: */
timeout_add(&ev, (struct timeval){ 5, 0 });
...
/* Later, during clean up: */
kill(pid, SIGTERM);
...
The problems I encountered with this approach is that the child
process pegs the processor hard. And assuming that can be fixed, I'm
not even sure this approach is what I need to get my deadline timer
idea off the ground.
Any ideas?
--
Andrew Troschinetz
Applied Research Laboratories
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