> [!NotifyQueue] > <table><tr><td rowspan="4" width="25%"><img src="assets/wl_lwlock_notify_queue.png"></td><td><b>Wait Category</b></td><td>LWLock</td></tr><tr><td><b>Mechanism</b></td><td><code>NotifyQueueLock</code></td></tr><tr><td><b>Operations</b></td><td><a href="Operations/Table/SeqScan">SeqScan</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>Message Dispatch Serialization point</b>. When a session executes <code>NOTIFY</code>, the message is appended to a global shared memory queue; when a <code>LISTEN</code>ing session checks for updates, it must read from this same queue.</td></tr></table>