lighty's life

Implementation

in stat_cache.c I started a separate thread for handling the stat() call, 4 threads to be exact.

stat_cache_get_entry() checks its cache, if this file is already known. If not, it pushes the filename into the stat_cache_queue and returns HANDLER_WAIT_FOR_EVENT. On the other end of the stat_cache_queue is one of the 4 stat()-threads which runs the stat() and pushs the connection back into the joblist_queue. On the mainloop, just where the poll() call is started is now the handler for this queue which just actives all connections which are in this queue.

This way we made the stat() call itself async and can leave the rest of the code as is. Up to now we only get the inode into the fs-buffers as in the other examples, we are not handling the full stat-cache updates in the thread.

gpointer *stat_cache_thread(gpointer *_srv) {
        server *srv = (server *)_srv;
        stat_job *sj = NULL;

        /* take the stat-job-queue */
        GAsyncQueue * inq = g_async_queue_ref(srv->stat_queue);
        GAsyncQueue * outq = g_async_queue_ref(srv->joblist_queue);

        /* get the jobs from the queue */
        while ((sj = g_async_queue_pop(inq))) {
                /* let's see what we have to stat */
                struct stat st;

                /* don't care about the return code for now */
                stat(sj->name->ptr, &st);

                stat_job_free(sj);

                g_async_queue_push(outq, sj->con);
        }

        return NULL;
}