atomic_dec(&tsk->signal->live);  
void exit_signal(struct task_struct *tsk){	write_lock_irq(&tasklist_lock);	__exit_signal(tsk);	write_unlock_irq(&tasklist_lock);}
10457	/local/tlutelli/issta_data/temp/c/2005_temp/2005/10457/8d027de54c77d38eedc9b331c7a2a39807d34691/signal.c/clean/kernel/signal.c