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Thread exiting

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Pagers kill all children but suspend themselves.
Currently not straightforward for a pager to delete its own tcb and quit.
It should take all allocator locks without sleeping, remove itself from
scheduler queue and then delete itself and quit. This is not so easy now
as some allocation locks are mutexes. (Address space lock, ktcb/space
allocators etc.)

An easier approach would be to have a kernel thread or a superior thread
that would delete the pager
This commit is contained in:
Bahadir Balban
2009-10-31 22:46:29 +02:00
parent c763679aaa
commit 5ed93b6563
4 changed files with 69 additions and 134 deletions
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62
src/generic/scheduler.c
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@@ -225,68 +225,6 @@ void sched_resume_async(struct ktcb *task)
RQ_ADD_FRONT);
}
/*
* A self-paging thread deletes itself,
* schedules and disappears from the system.
*/
void sched_exit_pager(void)
{
// printk("Pager (%d) Exiting...\n", current->tid);
/* Remove from its list, callers get -ESRCH */
tcb_remove(current);
/*
* If there are any sleepers on any of the task's
* waitqueues, we need to wake those tasks up.
*/
wake_up_all(&current->wqh_send, 0);
wake_up_all(&current->wqh_recv, 0);
/*
* We're a self-paging thread. We're gonna
* delete ourself and disappear from the
* system as soon as we schedule
*/
preempt_disable();
/*
* FIXME: TOO LONG!
*/
tcb_delete(current);
sched_rq_remove_task(current);
current->state = TASK_INACTIVE;
scheduler.prio_total -= current->priority;
BUG_ON(scheduler.prio_total < 0);
/* As soon as we schedule, we're gone */
preempt_enable();
schedule();
BUG();
}
void sched_exit_sync(void)
{
struct ktcb *pager = tcb_find(current->pagerid);
/* Go to exit list */
ktcb_list_add(current, &pager->child_exit_list);
preempt_disable();
/* Hint pager we're ready */
wake_up(&current->wqh_pager, 0);
sched_rq_remove_task(current);
current->state = TASK_DEAD;
current->flags &= ~TASK_EXITING;
preempt_enable();
/* Quit */
schedule();
BUG();
}
/*
* NOTE: Could do these as sched_prepare_suspend()
* + schedule() or need_resched = 1