image: "assets/wl_lwlock_aio_workersubmissionqueue.png" description: "Waiting to access the AIO worker submission queue lock." publish: "true" status: "hardened" --- > [!AioWorkerSubmissionQueue] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_aio_workersubmissionqueue.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>AIO</code></td><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</a>, <a href="Operations/Index/IndexScan">IndexScan</a></td></tr><tr><td><b>Resources</b></td><td><a href="Resources/RAM">Memory</a>, <a href="Resources/CPU">CPU</a></td></tr><tr><td colspan="3"><b>I/O Request Serialization point</b>. It represents the moment where a backend is attempting to "hand off" a new I/O request (like a page read or a WAL write) to the background AIO pool.</td></tr></table>