bool tcg_cpu_exec(void)
{
int ret = 0;
if (next_cpu == NULL)
next_cpu = first_cpu;
for (; next_cpu != NULL; next_cpu = next_cpu->next_cpu) {
CPUState *env = cur_cpu = next_cpu;
qemu_clock_enable(vm_clock,
(cur_cpu->singlestep_enabled & SSTEP_NOTIMER) == 0);
if (qemu_alarm_pending())
break;
if (cpu_can_run(env))
ret = qemu_cpu_exec(env);
else if (env->stop)
break;
if (ret == EXCP_DEBUG) {
gdb_set_stop_cpu(env);
debug_requested = EXCP_DEBUG;
break;
}
}
return tcg_has_work();
}
int qemu_calculate_timeout(void)
{
int timeout;
if (!vm_running)
timeout = 5000;
else if (tcg_has_work())
timeout = 0;
else {
#ifdef WIN32
/* This corresponds to the case where the emulated system is
* totally idle and waiting for i/o. The problem is that on
* Windows, the default value will prevent Windows user events
* to be delivered in less than 5 seconds.
*
* Upstream contains a different way to handle this, for now
* this hack should be sufficient until we integrate it into
* our tree.
*/
timeout = 1000/15; /* deliver user events every 15/th of second */
#else
timeout = 5000;
#endif
int64_t timeout_ns = (int64_t)timeout * 1000000LL;
timeout_ns = qemu_soonest_timeout(
timeout_ns, timerlistgroup_deadline_ns(&main_loop_tlg));
timeout = (int)((timeout_ns + 999999LL) / 1000000LL);
}
return timeout;
}
int qemu_calculate_timeout(void)
{
#ifndef CONFIG_IOTHREAD
int timeout;
if (!vm_running)
timeout = 5000;
else if (tcg_has_work())
timeout = 0;
else if (!use_icount) {
#ifdef WIN32
/* This corresponds to the case where the emulated system is
* totally idle and waiting for i/o. The problem is that on
* Windows, the default value will prevent Windows user events
* to be delivered in less than 5 seconds.
*
* Upstream contains a different way to handle this, for now
* this hack should be sufficient until we integrate it into
* our tree.
*/
timeout = 1000/15; /* deliver user events every 15/th of second */
#else
timeout = 5000;
#endif
} else {
/* XXX: use timeout computed from timers */
int64_t add;
int64_t delta;
/* Advance virtual time to the next event. */
delta = qemu_icount_delta();
if (delta > 0) {
/* If virtual time is ahead of real time then just
wait for IO. */
timeout = (delta + 999999) / 1000000;
} else {
/* Wait for either IO to occur or the next
timer event. */
add = qemu_next_deadline();
/* We advance the timer before checking for IO.
Limit the amount we advance so that early IO
activity won't get the guest too far ahead. */
if (add > 10000000)
add = 10000000;
delta += add;
qemu_icount += qemu_icount_round (add);
timeout = delta / 1000000;
if (timeout < 0)
timeout = 0;
}
}
return timeout;
#else /* CONFIG_IOTHREAD */
return 1000;
#endif
}
static void qemu_wait_io_event(CPUState *env)
{
while (!tcg_has_work())
qemu_cond_timedwait(env->halt_cond, &qemu_global_mutex, 1000);
qemu_mutex_unlock(&qemu_global_mutex);
/*
* Users of qemu_global_mutex can be starved, having no chance
* to acquire it since this path will get to it first.
* So use another lock to provide fairness.
*/
qemu_mutex_lock(&qemu_fair_mutex);
qemu_mutex_unlock(&qemu_fair_mutex);
qemu_mutex_lock(&qemu_global_mutex);
qemu_wait_io_event_common(env);
}
