Function perform_idle_server_maintenance

server/mpm/event/event.c:2906–3129

}

static void perform_idle_server_maintenance(int child_bucket,
                                            int *max_daemon_used)
{
    int num_buckets = retained->mpm->num_buckets;
    int idle_thread_count = 0;
    process_score *ps;
    int free_length = 0;
    int free_slots[MAX_SPAWN_RATE];
    int last_non_dead = -1;
    int active_thread_count = 0;
    int i, j;

    for (i = 0; i < server_limit; ++i) {
        if (num_buckets > 1 && (i % num_buckets) != child_bucket) {
            /* We only care about child_bucket in this call */
            continue;
        }
        if (i >= retained->max_daemon_used &&
            free_length == retained->idle_spawn_rate[child_bucket]) {
            /* short cut if all active processes have been examined and
             * enough empty scoreboard slots have been found
             */
            break;
        }

        ps = &ap_scoreboard_image->parent[i];
        if (ps->pid != 0) {
            int child_threads_active = 0;
            if (ps->quiescing == 1) {
                ps->quiescing = 2;
                retained->active_daemons--;
                ap_log_error(APLOG_MARK, APLOG_DEBUG, 0, ap_server_conf,
                             "Child %d quiescing: pid %d, gen %d, "
                             "active %d/%d, total %d/%d/%d",
                             i, (int)ps->pid, (int)ps->generation,
                             retained->active_daemons, active_daemons_limit,
                             retained->total_daemons, retained->max_daemon_used,
                             server_limit);
            }
            for (j = 0; j < threads_per_child; j++) {
                int status = ap_scoreboard_image->servers[i][j].status;

                /* We consider a starting server as idle because we started it
                 * at least a cycle ago, and if it still hasn't finished starting
                 * then we're just going to swamp things worse by forking more.
                 * So we hopefully won't need to fork more if we count it.
                 * This depends on the ordering of SERVER_READY and SERVER_STARTING.
                 */
                if (status <= SERVER_READY && !ps->quiescing && !ps->not_accepting
                    && ps->generation == retained->mpm->my_generation) {
                    ++idle_thread_count;
                }
                if (status >= SERVER_READY && status < SERVER_GRACEFUL) {
                    ++child_threads_active;
                }
            }
            active_thread_count += child_threads_active;
            if (child_threads_active == threads_per_child) {