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timer: extract timer_mod_ns_locked and timerlist_rearm 

These will be reused in timer_mod_anticipate functions.

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 15:06:39 +02:00
parent 3c05341157
commit 0f809e5fbe
1 changed files with 32 additions and 19 deletions
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51
qemu-timer.c
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@ -355,6 +355,34 @@ static void timer_del_locked(QEMUTimerList *timer_list, QEMUTimer *ts)
}
}
static bool timer_mod_ns_locked(QEMUTimerList *timer_list,
QEMUTimer *ts, int64_t expire_time)
{
QEMUTimer **pt, *t;
/* add the timer in the sorted list */
pt = &timer_list->active_timers;
for (;;) {
t = *pt;
if (!timer_expired_ns(t, expire_time)) {
break;
}
pt = &t->next;
}
ts->expire_time = MAX(expire_time, 0);
ts->next = *pt;
*pt = ts;
return pt == &timer_list->active_timers;
}
static void timerlist_rearm(QEMUTimerList *timer_list)
{
/* Interrupt execution to force deadline recalculation. */
qemu_clock_warp(timer_list->clock->type);
timerlist_notify(timer_list);
}
/* stop a timer, but do not dealloc it */
void timer_del(QEMUTimer *ts)
{
@ -370,30 +398,15 @@ void timer_del(QEMUTimer *ts)
void timer_mod_ns(QEMUTimer *ts, int64_t expire_time)
{
QEMUTimerList *timer_list = ts->timer_list;
QEMUTimer **pt, *t;
bool rearm;
qemu_mutex_lock(&timer_list->active_timers_lock);
timer_del_locked(timer_list, ts);
/* add the timer in the sorted list */
pt = &timer_list->active_timers;
for(;;) {
t = *pt;
if (!timer_expired_ns(t, expire_time)) {
break;
}
pt = &t->next;
}
ts->expire_time = MAX(expire_time, 0);
ts->next = *pt;
*pt = ts;
rearm = timer_mod_ns_locked(timer_list, ts, expire_time);
qemu_mutex_unlock(&timer_list->active_timers_lock);
/* Rearm if necessary */
if (pt == &timer_list->active_timers) {
/* Interrupt execution to force deadline recalculation. */
qemu_clock_warp(timer_list->clock->type);
timerlist_notify(timer_list);
if (rearm) {
timerlist_rearm(timer_list);
}
}