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Wait on working.

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Multi-threaded apps can now wait on children to destroy.
WAIT_ON is useful when a child exists with an exit code and the pager
of the child does not want to take the hassle of destorying it via an
ipc. It provides an alternative method of synchronous thread destruction,
where the child destroys itself directly rather than the parent issuing
a destroy on it explicitly.
This commit is contained in:
Bahadir Balban
2009-10-31 23:28:54 +02:00
parent 850c645d77
commit 0f537ea1f5
4 changed files with 38 additions and 26 deletions
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22
src/api/thread.c
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@@ -102,24 +102,34 @@ int thread_destroy_children(void)
}
void thread_destroy_self()
void thread_destroy_self(unsigned int exit_code)
{
thread_destroy_children();
current->exit_code = exit_code;
sched_exit_sync();
}
int thread_wait(struct ktcb *task)
{
return 0;
int ret;
/* Wait until task switches to desired state */
WAIT_EVENT(&task->wqh_pager,
task->state == TASK_DEAD, ret);
if (ret < 0)
return ret;
else
return (int)task->exit_code;
}
int thread_destroy(struct ktcb *task)
int thread_destroy(struct ktcb *task, unsigned int exit_code)
{
exit_code &= THREAD_EXIT_MASK;
if (TASK_IS_CHILD(task))
return thread_destroy_child(task);
else if (task == current)
thread_destroy_self();
thread_destroy_self(exit_code);
return 0;
}
@@ -412,7 +422,7 @@ int sys_thread_control(unsigned int flags, struct task_ids *ids)
ret = thread_suspend(task);
break;
case THREAD_DESTROY:
ret = thread_destroy(task);
ret = thread_destroy(task, flags);
break;
case THREAD_RECYCLE:
ret = thread_recycle(task);