Function aeApiPoll

app/redis-6.2.6/src/ae_ff_kqueue.c:134–186

}

static int aeApiPoll(aeEventLoop *eventLoop, struct timeval *tvp) {
    aeApiState *state = eventLoop->apidata;
    int retval, numevents = 0;

    if (tvp != NULL) {
        struct timespec timeout;
        timeout.tv_sec = tvp->tv_sec;
        timeout.tv_nsec = tvp->tv_usec * 1000;
        retval = ff_kevent(state->kqfd, NULL, 0, state->events, eventLoop->setsize,
                        &timeout);
    } else {
        retval = ff_kevent(state->kqfd, NULL, 0, state->events, eventLoop->setsize,
                        NULL);
    }

    if (retval > 0) {
        int j;

        /* Normally we execute the read event first and then the write event.
         * When the barrier is set, we will do it reverse.
         * 
         * However, under kqueue, read and write events would be separate
         * events, which would make it impossible to control the order of
         * reads and writes. So we store the event's mask we've got and merge
         * the same fd events later. */
        for (j = 0; j < retval; j++) {
            struct kevent *e = state->events+j;
            int fd = e->ident;
            int mask = 0; 

            if (e->filter == EVFILT_READ) mask = AE_READABLE;
            else if (e->filter == EVFILT_WRITE) mask = AE_WRITABLE;
            addEventMask(state->eventsMask, fd, mask);
        }

        /* Re-traversal to merge read and write events, and set the fd's mask to
         * 0 so that events are not added again when the fd is encountered again. */
        numevents = 0;
        for (j = 0; j < retval; j++) {
            struct kevent *e = state->events+j;
            int fd = e->ident;
            int mask = getEventMask(state->eventsMask, fd);

            if (mask) {
                eventLoop->fired[numevents].fd = fd;
                eventLoop->fired[numevents].mask = mask;
                resetEventMask(state->eventsMask, fd);
                numevents++;
            }
        }
    }
    return numevents;
}

static char *aeApiName(void) {
    return "ff_kqueue";