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Fixed a nasty spinlock issue with wake_up_all that didn't get caught.

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This commit is contained in:
Bahadir Balban
2009-10-31 20:47:20 +02:00
parent 638df9e238
commit c763679aaa
6 changed files with 67 additions and 15 deletions
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61
src/api/thread.c
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@@ -54,6 +54,54 @@ int thread_suspend(struct ktcb *task)
return thread_signal(task, TASK_SUSPENDING, TASK_INACTIVE);
}
static inline int TASK_IS_CHILD(struct ktcb *task)
{
return (((task) != current) &&
((task)->pagerid == current->tid));
}
int thread_delete_children(void)
{
struct ktcb *task, *n;
spin_lock(&curcont->ktcb_list.list_lock);
list_foreach_removable_struct(task, n,
&curcont->ktcb_list.list,
task_list) {
if (TASK_IS_CHILD(task)) {
spin_unlock(&curcont->ktcb_list.list_lock);
tcb_remove(task);
wake_up_all(&current->wqh_send, 0);
wake_up_all(&current->wqh_recv, 0);
BUG_ON(task->wqh_pager.sleepers > 0);
BUG_ON(task->state != TASK_INACTIVE);
tcb_delete(task);
spin_lock(&curcont->ktcb_list.list_lock);
}
}
spin_unlock(&curcont->ktcb_list.list_lock);
return 0;
}
int thread_suspend_children(void)
{
struct ktcb *task, *n;
spin_lock(&curcont->ktcb_list.list_lock);
list_foreach_removable_struct(task, n,
&curcont->ktcb_list.list,
task_list) {
if (TASK_IS_CHILD(task)) {
spin_unlock(&curcont->ktcb_list.list_lock);
thread_suspend(task);
spin_lock(&curcont->ktcb_list.list_lock);
}
}
spin_unlock(&curcont->ktcb_list.list_lock);
return 0;
}
/*
* Put them in TASK_DEAD so that a suspended exiting thread
* does not run again if issued THREAD_RUN
@@ -61,20 +109,23 @@ int thread_suspend(struct ktcb *task)
int thread_destroy(struct ktcb *task)
{
if (task == current) {
if (current->tid == current->pagerid)
if (current->tid == current->pagerid) {
/* Suspend children */
thread_suspend_children();
thread_delete_children();
sched_exit_pager();
else
} else {
sched_suspend_sync();
}
return 0;
}
thread_suspend(task);
tcb_remove(task);
/* Wake up waiters */
wake_up_all(&current->wqh_send, 0);
wake_up_all(&current->wqh_recv, 0);
wake_up_all(&task->wqh_send, 0);
wake_up_all(&task->wqh_recv, 0);
BUG_ON(task->wqh_pager.sleepers > 0);
BUG_ON(task->state != TASK_INACTIVE);