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 int tcg_cpu_exec(CPUArchState *env)
{
int ret;
#ifdef CONFIG_PROFILER
int64_t ti;
#endif
#ifdef CONFIG_PROFILER
ti = profile_getclock();
#endif
if (use_icount) {
int64_t count;
int64_t deadline;
int decr;
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
env->icount_decr.u16.low = 0;
env->icount_extra = 0;
deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
/* Maintain prior (possibly buggy) behaviour where if no deadline
* was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
* INT32_MAX nanoseconds ahead, we still use INT32_MAX
* nanoseconds.
*/
if ((deadline < 0) || (deadline > INT32_MAX)) {
deadline = INT32_MAX;
}
count = qemu_icount_round(deadline);
qemu_icount += count;
decr = (count > 0xffff) ? 0xffff : count;
count -= decr;
env->icount_decr.u16.low = decr;
env->icount_extra = count;
}
ret = cpu_exec(env);
#ifdef CONFIG_PROFILER
qemu_time += profile_getclock() - ti;
#endif
if (use_icount) {
/* Fold pending instructions back into the
instruction counter, and clear the interrupt flag. */
qemu_icount -= (env->icount_decr.u16.low
+ env->icount_extra);
env->icount_decr.u32 = 0;
env->icount_extra = 0;
}
return ret;
}
int qemu_calculate_timeout(void)
{
int timeout;
#ifdef CONFIG_IOTHREAD
/* When using icount, making forward progress with qemu_icount when the
guest CPU is idle is critical. We only use the static io-thread timeout
for non icount runs. */
if (!use_icount) {
return 1000;
}
#endif
if (!vm_running)
timeout = 5000;
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;
}
static int qemu_cpu_exec(CPUState *env)
{
int ret;
#ifdef CONFIG_PROFILER
int64_t ti;
#endif
#if 1 /* yclin */
if (tracer_toggle_request) {
tb_flush(env);
}
#endif
#ifdef CONFIG_PROFILER
ti = profile_getclock();
#endif
if (use_icount) {
int64_t count;
int decr;
qemu_icount -= (env->icount_decr.u16.low + env->icount_extra);
env->icount_decr.u16.low = 0;
env->icount_extra = 0;
count = qemu_icount_round (qemu_next_deadline());
qemu_icount += count;
decr = (count > 0xffff) ? 0xffff : count;
count -= decr;
env->icount_decr.u16.low = decr;
env->icount_extra = count;
}
ret = cpu_exec(env);
#ifdef CONFIG_PROFILER
qemu_time += profile_getclock() - ti;
#endif
if (use_icount) {
/* Fold pending instructions back into the
instruction counter, and clear the interrupt flag. */
qemu_icount -= (env->icount_decr.u16.low
+ env->icount_extra);
env->icount_decr.u32 = 0;
env->icount_extra = 0;
}
return ret;
}
int qemu_calculate_timeout(void)
{
#ifndef CONFIG_IOTHREAD
int timeout;
if (!vm_running)
timeout = 5000;
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_icount_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
}
