int
gdb_do_one_event (void)
{
static int event_source_head = 0;
const int number_of_sources = 3;
int current = 0;
/* First let's see if there are any asynchronous signal handlers
that are ready. These would be the result of invoking any of the
signal handlers. */
if (invoke_async_signal_handlers ())
return 1;
/* To level the fairness across event sources, we poll them in a
round-robin fashion. */
for (current = 0; current < number_of_sources; current++)
{
int res;
switch (event_source_head)
{
case 0:
/* Are any timers that are ready? */
res = poll_timers ();
break;
case 1:
/* Are there events already waiting to be collected on the
monitored file descriptors? */
res = gdb_wait_for_event (0);
break;
case 2:
/* Are there any asynchronous event handlers ready? */
res = check_async_event_handlers ();
break;
default:
internal_error (__FILE__, __LINE__,
"unexpected event_source_head %d",
event_source_head);
}
event_source_head++;
if (event_source_head == number_of_sources)
event_source_head = 0;
if (res > 0)
return 1;
}
/* Block waiting for a new event. If gdb_wait_for_event returns -1,
we should get out because this means that there are no event
sources left. This will make the event loop stop, and the
application exit. */
if (gdb_wait_for_event (1) < 0)
return -1;
/* If gdb_wait_for_event has returned 1, it means that one event has
been handled. We break out of the loop. */
return 1;
}
int
gdb_do_one_event (void *data)
{
static int event_source_head = 0;
const int number_of_sources = 3;
int current = 0;
/* Any events already waiting in the queue? */
if (process_event ())
return 1;
/* To level the fairness across event sources, we poll them in a
round-robin fashion. */
for (current = 0; current < number_of_sources; current++)
{
switch (event_source_head)
{
case 0:
/* Are any timers that are ready? If so, put an event on the
queue. */
poll_timers ();
break;
case 1:
/* Are there events already waiting to be collected on the
monitored file descriptors? */
gdb_wait_for_event (0);
break;
case 2:
/* Are there any asynchronous event handlers ready? */
check_async_event_handlers ();
break;
}
event_source_head++;
if (event_source_head == number_of_sources)
event_source_head = 0;
}
/* Handle any new events collected. */
if (process_event ())
return 1;
/* Block waiting for a new event. If gdb_wait_for_event returns -1,
we should get out because this means that there are no event
sources left. This will make the event loop stop, and the
application exit. */
if (gdb_wait_for_event (1) < 0)
return -1;
/* Handle any new events occurred while waiting. */
if (process_event ())
return 1;
/* If gdb_wait_for_event has returned 1, it means that one event has
been handled. We break out of the loop. */
return 1;
}
