void
isc_task_sendanddetach(isc_task_t **taskp, isc_event_t **eventp) {
isc_boolean_t idle1, idle2;
isc_task_t *task;
/*
* Send '*event' to '*taskp' and then detach '*taskp' from its
* task.
*/
REQUIRE(taskp != NULL);
task = *taskp;
REQUIRE(VALID_TASK(task));
XTRACE("isc_task_sendanddetach");
LOCK(&task->lock);
idle1 = task_send(task, eventp);
idle2 = task_detach(task);
UNLOCK(&task->lock);
/*
* If idle1, then idle2 shouldn't be true as well since we're holding
* the task lock, and thus the task cannot switch from ready back to
* idle.
*/
INSIST(!(idle1 && idle2));
if (idle1 || idle2)
task_ready(task);
*taskp = NULL;
}
ISC_TASKFUNC_SCOPE void
isc__task_send(isc_task_t *task0, isc_event_t **eventp) {
isc__task_t *task = (isc__task_t *)task0;
isc_boolean_t was_idle;
/*
* Send '*event' to 'task'.
*/
REQUIRE(VALID_TASK(task));
XTRACE("isc_task_send");
/*
* We're trying hard to hold locks for as short a time as possible.
* We're also trying to hold as few locks as possible. This is why
* some processing is deferred until after the lock is released.
*/
LOCK(&task->lock);
was_idle = task_send(task, eventp);
UNLOCK(&task->lock);
if (was_idle) {
/*
* We need to add this task to the ready queue.
*
* We've waited until now to do it because making a task
* ready requires locking the manager. If we tried to do
* this while holding the task lock, we could deadlock.
*
* We've changed the state to ready, so no one else will
* be trying to add this task to the ready queue. The
* only way to leave the ready state is by executing the
* task. It thus doesn't matter if events are added,
* removed, or a shutdown is started in the interval
* between the time we released the task lock, and the time
* we add the task to the ready queue.
*/
task_ready(task);
}
}
