Function ap_queue_info_pop_pool

server/mpm_fdqueue.c:253–282

}

void ap_queue_info_pop_pool(fd_queue_info_t *queue_info,
                            apr_pool_t **recycled_pool)
{
    /* Atomically pop a pool from the recycled list */

    /* This function is safe only as long as it is single threaded because
     * it reaches into the queue and accesses "next" which can change.
     * We are OK today because it is only called from the listener thread.
     * cas-based pushes do not have the same limitation - any number can
     * happen concurrently with a single cas-based pop.
     */

    *recycled_pool = NULL;


    /* Atomically pop a pool from the recycled list */
    for (;;) {
        struct recycled_pool *first_pool = queue_info->recycled_pools;
        if (first_pool == NULL) {
            break;
        }
        if (apr_atomic_casptr((void *)&queue_info->recycled_pools,
                              first_pool->next, first_pool) == first_pool) {
            *recycled_pool = first_pool->pool;
            if (queue_info->max_recycled_pools >= 0)
                apr_atomic_dec32(&queue_info->recycled_pools_count);
            break;
        }
    }
}

void ap_queue_info_free_idle_pools(fd_queue_info_t *queue_info)
{