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more alarm timer cleanup 

The timer_alarm_pending variable is related to the alarm timer but not
placed in the struct.  Also, in qemu_mod_timer the wrong flag was being
tested: the timer is rearmed in the alarm timer "bottom half", so the
right flag to test there is the "pending" flag.

Finally, I hoisted the NULL checks from alarm_has_dynticks to
host_alarm_handler.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
This commit is contained in:
Paolo Bonzini 2010-03-10 11:38:41 +01:00 committed by Anthony Liguori
parent cd48d7e8f3
commit 1828be316f
1 changed files with 18 additions and 11 deletions
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29
vl.c
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@ -258,7 +258,6 @@ uint64_t node_cpumask[MAX_NODES];
static CPUState *cur_cpu;
static CPUState *next_cpu;
static int timer_alarm_pending = 1;
/* Conversion factor from emulated instructions to virtual clock ticks. */
static int icount_time_shift;
/* Arbitrarily pick 1MIPS as the minimum allowable speed. */
@ -597,12 +596,13 @@ struct qemu_alarm_timer {
void (*rearm)(struct qemu_alarm_timer *t);
void *priv;
unsigned int expired;
char expired;
char pending;
};
static inline int alarm_has_dynticks(struct qemu_alarm_timer *t)
{
return t && t->rearm;
return !!t->rearm;
}
static void qemu_rearm_alarm_timer(struct qemu_alarm_timer *t)
@ -877,7 +877,7 @@ void qemu_mod_timer(QEMUTimer *ts, int64_t expire_time)
/* Rearm if necessary */
if (pt == &active_timers[ts->clock->type]) {
if (!alarm_timer->expired) {
if (!alarm_timer->pending) {
qemu_rearm_alarm_timer(alarm_timer);
}
/* Interrupt execution to force deadline recalculation. */
@ -1012,6 +1012,10 @@ static void CALLBACK host_alarm_handler(UINT uTimerID, UINT uMsg,
static void host_alarm_handler(int host_signum)
#endif
{
struct qemu_alarm_timer *t = alarm_timer;
if (!t)
return;
#if 0
#define DISP_FREQ 1000
{
@ -1041,7 +1045,7 @@ static void host_alarm_handler(int host_signum)
last_clock = ti;
}
#endif
if (alarm_has_dynticks(alarm_timer) ||
if (alarm_has_dynticks(t) ||
(!use_icount &&
qemu_timer_expired(active_timers[QEMU_CLOCK_VIRTUAL],
qemu_get_clock(vm_clock))) ||
@ -1050,7 +1054,7 @@ static void host_alarm_handler(int host_signum)
qemu_timer_expired(active_timers[QEMU_CLOCK_HOST],
qemu_get_clock(host_clock))) {
qemu_event_increment();
if (alarm_timer) alarm_timer->expired = 1;
t->expired = alarm_has_dynticks(t);
#ifndef CONFIG_IOTHREAD
if (next_cpu) {
@ -1058,7 +1062,7 @@ static void host_alarm_handler(int host_signum)
cpu_exit(next_cpu);
}
#endif
timer_alarm_pending = 1;
t->pending = 1;
qemu_notify_event();
}
}
@ -1438,6 +1442,8 @@ static int init_timer_alarm(void)
goto fail;
}
/* first event is at time 0 */
t->pending = 1;
alarm_timer = t;
return 0;
@ -1448,8 +1454,9 @@ fail:
static void quit_timers(void)
{
alarm_timer->stop(alarm_timer);
struct qemu_alarm_timer *t = alarm_timer;
alarm_timer = NULL;
t->stop(t);
}
/***********************************************************/
@ -3887,6 +3894,8 @@ void main_loop_wait(int timeout)
qemu_rearm_alarm_timer(alarm_timer);
}
alarm_timer->pending = 0;
/* vm time timers */
if (vm_running) {
if (!cur_cpu || likely(!(cur_cpu->singlestep_enabled & SSTEP_NOTIMER)))
@ -3956,10 +3965,8 @@ static void tcg_cpu_exec(void)
for (; next_cpu != NULL; next_cpu = next_cpu->next_cpu) {
CPUState *env = cur_cpu = next_cpu;
if (timer_alarm_pending) {
timer_alarm_pending = 0;
if (alarm_timer->pending)
break;
}
if (cpu_can_run(env))
ret = qemu_cpu_exec(env);
else if (env->stop)