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voiddo_group_exit(int exit_code){	struct signal_struct *sig = current->signal;		if (signal_group_exit(sig))		exit_code = sig->group_exit_code;	else if (!thread_group_empty(current)) {		struct sighand_struct *const sighand = current->sighand;		spin_lock_irq(&sighand->siglock);		if (signal_group_exit(sig))			/* Another thread got here before we took the lock.  */			exit_code = sig->group_exit_code;		else {			sig->group_exit_code = exit_code;			sig->flags = SIGNAL_GROUP_EXIT;			zap_other_threads(current);		}		spin_unlock_irq(&sighand->siglock);	}	do_exit(exit_code);}

进程调度之5：系统调用exit与wait4

Linux进程退出详解(do_exit)--Linux进程的管理与调度(十四)）