Exemplo n.º 1
0
int posix_timer_event(struct k_itimer *timr, int si_private)
{
	struct task_struct *task;
	int shared, ret = -1;
	/*
	 * FIXME: if ->sigq is queued we can race with
	 * dequeue_signal()->do_schedule_next_timer().
	 *
	 * If dequeue_signal() sees the "right" value of
	 * si_sys_private it calls do_schedule_next_timer().
	 * We re-queue ->sigq and drop ->it_lock().
	 * do_schedule_next_timer() locks the timer
	 * and re-schedules it while ->sigq is pending.
	 * Not really bad, but not that we want.
	 */
	timr->sigq->info.si_sys_private = si_private;

	rcu_read_lock();
	task = pid_task(timr->it_pid, PIDTYPE_PID);
	if (task) {
		shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
		ret = send_sigqueue(timr->sigq, task, shared);
	}
	rcu_read_unlock();
	/* If we failed to send the signal the timer stops. */
	return ret > 0;
}
Exemplo n.º 2
0
int posix_timer_event(struct k_itimer *timr,int si_private)
{
	memset(&timr->sigq->info, 0, sizeof(siginfo_t));
	timr->sigq->info.si_sys_private = si_private;
	/* Send signal to the process that owns this timer.*/

	timr->sigq->info.si_signo = timr->it_sigev_signo;
	timr->sigq->info.si_errno = 0;
	timr->sigq->info.si_code = SI_TIMER;
	timr->sigq->info.si_tid = timr->it_id;
	timr->sigq->info.si_value = timr->it_sigev_value;

	if (timr->it_sigev_notify & SIGEV_THREAD_ID) {
		struct task_struct *leader;
		int ret = send_sigqueue(timr->it_sigev_signo, timr->sigq,
					timr->it_process);

		if (likely(ret >= 0))
			return ret;

		timr->it_sigev_notify = SIGEV_SIGNAL;
		leader = timr->it_process->group_leader;
		put_task_struct(timr->it_process);
		timr->it_process = leader;
	}

	return send_group_sigqueue(timr->it_sigev_signo, timr->sigq,
				   timr->it_process);
}
Exemplo n.º 3
0
int posix_timer_event(struct k_itimer *timr, int si_private)
{
	struct task_struct *task;
	int shared, ret = -1;
	timr->sigq->info.si_sys_private = si_private;

	rcu_read_lock();
	task = pid_task(timr->it_pid, PIDTYPE_PID);
	if (task) {
		shared = !(timr->it_sigev_notify & SIGEV_THREAD_ID);
		ret = send_sigqueue(timr->sigq, task, shared);
	}
	rcu_read_unlock();
	
	return ret > 0;
}