Function postponeClientRead

app/redis-6.2.6/src/networking.c:3683–3695

Return 1 if we want to handle the client read later using threaded I/O. * This is called by the readable handler of the event loop. * As a side effect of calling this function the client is put in the * pending read clients and flagged as such. */

 * As a side effect of calling this function the client is put in the
 * pending read clients and flagged as such. */
int postponeClientRead(client *c) {
    if (server.io_threads_active &&
        server.io_threads_do_reads &&
        !ProcessingEventsWhileBlocked &&
        !(c->flags & (CLIENT_MASTER|CLIENT_SLAVE|CLIENT_PENDING_READ|CLIENT_BLOCKED))) 
    {
        c->flags |= CLIENT_PENDING_READ;
        listAddNodeHead(server.clients_pending_read,c);
        return 1;
    } else {
        return 0;
    }
}

/* When threaded I/O is also enabled for the reading + parsing side, the
 * readable handler will just put normal clients into a queue of clients to