stop threads failed!

[Hua Feijun]

I want to set threads's status to TASK_STOPPED by the following
code.The syslog has show this rourine has been executed,buf the thread
is still running.Who can tell me the reason?Thanks very much!
write_lock(&tasklist_lock);
do
{
printk("set threads stopped\n");			
p->state = TASK_STOPPED;
} while ((p = next_thread(p)) != leader);
write_unlock(&tasklist_lock);
schedule();
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