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timer: add timer_mod_anticipate and timer_mod_anticipate_ns

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These let a user anticipate the deadline of a timer, atomically with
other sites that call the function.  This helps avoiding complicated
lock hierarchies.

Reviewed-by: Alex Bligh <alex@alex.org.uk>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini
2013-10-03 15:11:43 +02:00
parent 0f809e5fbe
commit add40e9777
2 changed files with 55 additions and 0 deletions
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29
qemu-timer.c
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@@ -410,11 +410,40 @@ void timer_mod_ns(QEMUTimer *ts, int64_t expire_time)
}
}
/* modify the current timer so that it will be fired when current_time
>= expire_time or the current deadline, whichever comes earlier.
The corresponding callback will be called. */
void timer_mod_anticipate_ns(QEMUTimer *ts, int64_t expire_time)
{
QEMUTimerList *timer_list = ts->timer_list;
bool rearm;
qemu_mutex_lock(&timer_list->active_timers_lock);
if (ts->expire_time == -1 || ts->expire_time > expire_time) {
if (ts->expire_time != -1) {
timer_del_locked(timer_list, ts);
}
rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
} else {
rearm = false;
}
qemu_mutex_unlock(&timer_list->active_timers_lock);
if (rearm) {
timerlist_rearm(timer_list);
}
}
void timer_mod(QEMUTimer *ts, int64_t expire_time)
{
timer_mod_ns(ts, expire_time * ts->scale);
}
void timer_mod_anticipate(QEMUTimer *ts, int64_t expire_time)
{
timer_mod_anticipate_ns(ts, expire_time * ts->scale);
}
bool timer_pending(QEMUTimer *ts)
{
return ts->expire_time >= 0;