![[wl_client.png|256]] Waiting on network I/O with the connected client or a
remote replication server.
![[ClientRead]]
![[ClientWrite]]
![[GSSOpenServer]]
![[LibPQWalReceiverConnect]]
![[LibPQWalReceiverReceive]]
![[SSLOpenServer]]
![[WalSenderWaitForWAL]]
![[WalSenderWriteData]]