Function sigqueue_dequeue

components/lwp/lwp_signal.c:277–311

* dequeue a siginfo matching the signo which is likely to be existed, and * test if any other siblings remains */

 * test if any other siblings remains
 */
static lwp_siginfo_t sigqueue_dequeue(lwp_sigqueue_t sigqueue, int signo)
{
    lwp_siginfo_t found;
    lwp_siginfo_t candidate;
    lwp_siginfo_t next;
    rt_bool_t is_empty;

    found = RT_NULL;
    is_empty = RT_TRUE;
    rt_list_for_each_entry_safe(candidate, next, &sigqueue->siginfo_list, node)
    {
        if (candidate->ksiginfo.signo == signo)
        {
            if (found)
            {
                /* already found */
                is_empty = RT_FALSE;
                break;
            }
            else
            {
                /* found first */
                found = candidate;
                rt_list_remove(&found->node);
            }
        }
        else if (candidate->ksiginfo.signo > signo)
            break;
    }

    if (found && is_empty)
        _sigdelset(&sigqueue->sigset_pending, signo);

    return found;
}

/**
 * Discard all the signal matching `signo` in sigqueue