C++ APR_RING_REMOVE函数代码示例

APR_DECLARE(apr_status_t) apr_pollset_remove(apr_pollset_t *pollset,
                                             const apr_pollfd_t *descriptor)
{
    apr_os_sock_t fd;
    pfd_elem_t *ep;
    apr_status_t rv = APR_SUCCESS;
    int res;

    pollset_lock_rings();

    if (descriptor->desc_type == APR_POLL_SOCKET) {
        fd = descriptor->desc.s->socketdes;
    }
    else {
        fd = descriptor->desc.f->filedes;
    }

    res = port_dissociate(pollset->port_fd, PORT_SOURCE_FD, fd);

    if (res < 0) {
        rv = APR_NOTFOUND;
    }

    if (!APR_RING_EMPTY(&(pollset->query_ring), pfd_elem_t, link)) {
        for (ep = APR_RING_FIRST(&(pollset->query_ring));
             ep != APR_RING_SENTINEL(&(pollset->query_ring),
                                     pfd_elem_t, link);
             ep = APR_RING_NEXT(ep, link)) {

            if (descriptor->desc.s == ep->pfd.desc.s) {
                APR_RING_REMOVE(ep, link);
                APR_RING_INSERT_TAIL(&(pollset->dead_ring),
                                     ep, pfd_elem_t, link);
                break;
            }
        }
    }

    if (!APR_RING_EMPTY(&(pollset->add_ring), pfd_elem_t, link)) {
        for (ep = APR_RING_FIRST(&(pollset->add_ring));
             ep != APR_RING_SENTINEL(&(pollset->add_ring),
                                     pfd_elem_t, link);
             ep = APR_RING_NEXT(ep, link)) {

            if (descriptor->desc.s == ep->pfd.desc.s) {
                APR_RING_REMOVE(ep, link);
                APR_RING_INSERT_TAIL(&(pollset->dead_ring),
                                     ep, pfd_elem_t, link);
                break;
            }
        }
    }

    pollset_unlock_rings();

    return rv;
}

/*
 * NOTE: This function is not thread safe by itself. Caller should hold the lock
 */
static apr_thread_pool_task_t *task_new(apr_thread_pool_t * me,
                                        apr_thread_start_t func,
                                        void *param, apr_byte_t priority,
                                        void *owner, apr_time_t time)
{
    apr_thread_pool_task_t *t;

    if (APR_RING_EMPTY(me->recycled_tasks, apr_thread_pool_task, link)) {
        t = apr_pcalloc(me->pool, sizeof(*t));
        if (NULL == t) {
            return NULL;
        }
    }
    else {
        t = APR_RING_FIRST(me->recycled_tasks);
        APR_RING_REMOVE(t, link);
    }

    APR_RING_ELEM_INIT(t, link);
    t->func = func;
    t->param = param;
    t->owner = owner;
    if (time > 0) {
        t->dispatch.time = apr_time_now() + time;
    }
    else {
        t->dispatch.priority = priority;
    }
    return t;
}

static apr_status_t mmap_cleanup(void *themmap)
{
    apr_mmap_t *mm = themmap;
    apr_mmap_t *next = APR_RING_NEXT(mm,link);
    int rv = 0;

    /* we no longer refer to the mmaped region */
    APR_RING_REMOVE(mm,link);
    APR_RING_NEXT(mm,link) = NULL;
    APR_RING_PREV(mm,link) = NULL;

    if (next != mm) {
        /* more references exist, so we're done */
        return APR_SUCCESS;
    }

#ifdef BEOS
    rv = delete_area(mm->area);
#else
    rv = munmap(mm->mm, mm->size);
#endif
    mm->mm = (void *)-1;

    if (rv == 0) {
        return APR_SUCCESS;
    }
    return errno;
}

static apr_status_t remove_tasks(apr_thread_pool_t *me, void *owner)
{
    apr_thread_pool_task_t *t_loc;
    apr_thread_pool_task_t *next;
    int seg;

    t_loc = APR_RING_FIRST(me->tasks);
    while (t_loc != APR_RING_SENTINEL(me->tasks, apr_thread_pool_task, link)) {
        next = APR_RING_NEXT(t_loc, link);
        if (t_loc->owner == owner) {
            --me->task_cnt;
            seg = TASK_PRIORITY_SEG(t_loc);
            if (t_loc == me->task_idx[seg]) {
                me->task_idx[seg] = APR_RING_NEXT(t_loc, link);
                if (me->task_idx[seg] == APR_RING_SENTINEL(me->tasks,
                                                           apr_thread_pool_task,
                                                           link)
                    || TASK_PRIORITY_SEG(me->task_idx[seg]) != seg) {
                    me->task_idx[seg] = NULL;
                }
            }
            APR_RING_REMOVE(t_loc, link);
        }
        t_loc = next;
    }
    return APR_SUCCESS;
}

/** Close connection */
static apt_bool_t rtsp_server_connection_close(rtsp_server_t *server, rtsp_server_connection_t *rtsp_connection)
{
	apr_size_t remaining_sessions = 0;
	if(!rtsp_connection || !rtsp_connection->sock) {
		return FALSE;
	}
	apt_log(RTSP_LOG_MARK,APT_PRIO_INFO,"Close RTSP Connection %s",rtsp_connection->id);
	apt_poller_task_descriptor_remove(server->task,&rtsp_connection->sock_pfd);
	apr_socket_close(rtsp_connection->sock);
	rtsp_connection->sock = NULL;

	APR_RING_REMOVE(rtsp_connection,link);

	remaining_sessions = apr_hash_count(rtsp_connection->session_table);
	if(remaining_sessions) {
		rtsp_server_session_t *session;
		void *val;
		apr_hash_index_t *it;
		apt_log(RTSP_LOG_MARK,APT_PRIO_NOTICE,"Terminate Remaining RTSP Sessions [%"APR_SIZE_T_FMT"]",
			remaining_sessions);
		it = apr_hash_first(rtsp_connection->pool,rtsp_connection->session_table);
		for(; it; it = apr_hash_next(it)) {
			apr_hash_this(it,NULL,NULL,&val);
			session = val;
			if(session && session->terminating == FALSE) {
				rtsp_server_session_terminate_request(server,session);
			}
		}
	}
	else {
		rtsp_server_connection_destroy(rtsp_connection);
	}
	return TRUE;
}

/**
 * Grab a resource from the front of the resource list.
 * Assumes: that the reslist is locked.
 */
static apr_res_t *pop_resource(apr_reslist_t *reslist)
{
    apr_res_t *res;
    res = APR_RING_FIRST(&reslist->avail_list);
    APR_RING_REMOVE(res, link);
    reslist->nidle--;
    return res;
}

static void end_gen(mpm_gen_info_t *gi)
{
    ap_log_error(APLOG_MARK, APLOG_TRACE4, 0, ap_server_conf,
                 "end of generation %d", gi->gen);
    ap_run_end_generation(ap_server_conf, gi->gen);
    APR_RING_REMOVE(gi, link);
    APR_RING_INSERT_HEAD(unused_geninfo, gi, mpm_gen_info_t, link);
}

static apr_status_t do_wait(apr_thread_cond_t *cond, apr_thread_mutex_t *mutex,
                            apr_interval_time_t timeout)
{
    struct waiter_t *wait;
    thread_id cth = find_thread(NULL);
    apr_status_t rv;
    int flags = B_RELATIVE_TIMEOUT;
    
    /* We must be the owner of the mutex or we can't do this... */    
    if (mutex->owner != cth) {
        /* What should we return??? */
        return APR_EINVAL;
    }

    acquire_sem(cond->lock);
    wait = APR_RING_FIRST(&cond->flist);
    if (wait)
        APR_RING_REMOVE(wait, link);
    else
        wait = make_waiter(cond->pool);   
    APR_RING_INSERT_TAIL(&cond->alist, wait, waiter_t, link);
    cond->condlock = mutex;
    release_sem(cond->lock);
       
    apr_thread_mutex_unlock(cond->condlock);

    if (timeout == 0)
        flags = 0;
        
    rv = acquire_sem_etc(wait->sem, 1, flags, timeout);

    apr_thread_mutex_lock(cond->condlock);
    
    if (rv != B_OK) {
        if (rv == B_TIMED_OUT)
            return APR_TIMEUP;
        return rv;       
    }

    acquire_sem(cond->lock);
    APR_RING_REMOVE(wait, link);
    APR_RING_INSERT_TAIL(&cond->flist, wait, waiter_t, link);
    release_sem(cond->lock);
    
    return APR_SUCCESS;
}

APT_DECLARE(apt_list_elem_t*) apt_list_elem_remove(apt_obj_list_t *list, apt_list_elem_t *elem)
{
	apt_list_elem_t *next_elem = APR_RING_NEXT(elem,link);
	APR_RING_REMOVE(elem,link);
	if(next_elem == APR_RING_SENTINEL(&list->head,apt_list_elem_t,link)) {
		next_elem = NULL;
	}
	return next_elem;
}

static APR_INLINE mpf_chunk_t* mpf_buffer_chunk_read(mpf_buffer_t *buffer)
{
	mpf_chunk_t *chunk = NULL;
	if(!APR_RING_EMPTY(&buffer->head,mpf_chunk_t,link)) {
		chunk = APR_RING_FIRST(&buffer->head);
		APR_RING_REMOVE(chunk,link);
	}
	return chunk;
}

MPF_DECLARE(void) mpf_context_factory_destroy(mpf_context_factory_t *factory)
{
	mpf_context_t *context;
	while(!APR_RING_EMPTY(&factory->head, mpf_context_t, link)) {
		context = APR_RING_FIRST(&factory->head);
		mpf_context_destroy(context);
		APR_RING_REMOVE(context, link);
	}
}

/* Destroy RTSP connection */
static apt_bool_t rtsp_client_connection_destroy(rtsp_client_connection_t *rtsp_connection)
{
	rtsp_client_t *client = rtsp_connection->client;
	APR_RING_REMOVE(rtsp_connection,link);
	rtsp_client_connection_close(client,rtsp_connection);
	apt_log(RTSP_LOG_MARK,APT_PRIO_NOTICE,"Destroy RTSP Connection %s",rtsp_connection->id);
	apr_pool_destroy(rtsp_connection->pool);

	return TRUE;
}

/**
 * Retrieves the next available socket from the queue. If there are no
 * sockets available, it will block until one becomes available.
 * Once retrieved, the socket is placed into the address specified by
 * 'sd'.
 */
apr_status_t ap_queue_pop_something(fd_queue_t * queue, apr_socket_t ** sd,
                                    event_conn_state_t ** ecs, apr_pool_t ** p,
                                    timer_event_t ** te_out)
{
    fd_queue_elem_t *elem;
    apr_status_t rv;

    if ((rv = apr_thread_mutex_lock(queue->one_big_mutex)) != APR_SUCCESS) {
        return rv;
    }

    /* Keep waiting until we wake up and find that the queue is not empty. */
    if (ap_queue_empty(queue)) {
        if (!queue->terminated) {
            apr_thread_cond_wait(queue->not_empty, queue->one_big_mutex);
        }
        /* If we wake up and it's still empty, then we were interrupted */
        if (ap_queue_empty(queue)) {
            rv = apr_thread_mutex_unlock(queue->one_big_mutex);
            if (rv != APR_SUCCESS) {
                return rv;
            }
            if (queue->terminated) {
                return APR_EOF; /* no more elements ever again */
            }
            else {
                return APR_EINTR;
            }
        }
    }

    *te_out = NULL;

    if (!APR_RING_EMPTY(&queue->timers, timer_event_t, link)) {
        *te_out = APR_RING_FIRST(&queue->timers);
        APR_RING_REMOVE(*te_out, link);
    }
    else {
        elem = &queue->data[queue->out];
        queue->out++;
        if (queue->out >= queue->bounds)
            queue->out -= queue->bounds;
        queue->nelts--;
        *sd = elem->sd;
        *ecs = elem->ecs;
        *p = elem->p;
#ifdef AP_DEBUG
        elem->sd = NULL;
        elem->p = NULL;
#endif /* AP_DEBUG */
    }

    rv = apr_thread_mutex_unlock(queue->one_big_mutex);
    return rv;
}

static apr_status_t impl_pollset_add(apr_pollset_t *pollset,
                                     const apr_pollfd_t *descriptor)
{
    apr_os_sock_t fd;
    pfd_elem_t *elem;
    apr_status_t rv = APR_SUCCESS;

    pollset_lock_rings();

    if (!APR_RING_EMPTY(&(pollset->p->free_ring), pfd_elem_t, link)) {
        elem = APR_RING_FIRST(&(pollset->p->free_ring));
        APR_RING_REMOVE(elem, link);
    }
    else {
        elem = (pfd_elem_t *) apr_palloc(pollset->pool, sizeof(pfd_elem_t));
        APR_RING_ELEM_INIT(elem, link);
    }
    elem->pfd = *descriptor;

    if (descriptor->desc_type == APR_POLL_SOCKET) {
        fd = descriptor->desc.s->socketdes;
    }
    else {
        fd = descriptor->desc.f->filedes;
    }

    if (descriptor->reqevents & APR_POLLIN) {
        EV_SET(&pollset->p->kevent, fd, EVFILT_READ, EV_ADD, 0, 0, elem);

        if (kevent(pollset->p->kqueue_fd, &pollset->p->kevent, 1, NULL, 0,
                   NULL) == -1) {
            rv = apr_get_netos_error();
        }
    }

    if (descriptor->reqevents & APR_POLLOUT && rv == APR_SUCCESS) {
        EV_SET(&pollset->p->kevent, fd, EVFILT_WRITE, EV_ADD, 0, 0, elem);

        if (kevent(pollset->p->kqueue_fd, &pollset->p->kevent, 1, NULL, 0,
                   NULL) == -1) {
            rv = apr_get_netos_error();
        }
    }

    if (rv == APR_SUCCESS) {
        APR_RING_INSERT_TAIL(&(pollset->p->query_ring), elem, pfd_elem_t, link);
    }
    else {
        APR_RING_INSERT_TAIL(&(pollset->p->free_ring), elem, pfd_elem_t, link);
    }

    pollset_unlock_rings();

    return rv;
}

/**
 * Get an empty resource container from the free list.
 */
static apr_res_t *get_container(apr_reslist_t *reslist)
{
    apr_res_t *res;

    assert(!APR_RING_EMPTY(&reslist->free_list, apr_res_t, link));

    res = APR_RING_FIRST(&reslist->free_list);
    APR_RING_REMOVE(res, link);

    return res;
}