Refactor some code related to wait events "BufferPin" and "Extension"

The following changes are done:
- Addition of WaitEventBufferPin and WaitEventExtension, that hold a
list of wait events related to each category.
- Addition of two functions that encapsulate the list of wait events for
each category.
- Rename BUFFER_PIN to BUFFERPIN (only this wait event class used an
underscore, requiring a specific rule in the automation script).

These changes make a bit easier the automatic generation of all the code
and documentation related to wait events, as all the wait event
categories are now controlled by consistent structures and functions.

Author: Bertrand Drouvot
Discussion: https://postgr.es/m/[email protected]
Discussion: https://postgr.es/m/[email protected]

2 files changed, 2 insertions, 2 deletions

diff --git a/src/backend/storage/buffer/bufmgr.c b/src/backend/storage/buffer/bufmgr.c
index 3c59bbd04ea..a7e3b9bb1d3 100644
--- a/src/backend/storage/buffer/bufmgr.c
+++ b/src/backend/storage/buffer/bufmgr.c
@@ -4901,7 +4901,7 @@ LockBufferForCleanup(Buffer buffer)
 			SetStartupBufferPinWaitBufId(-1);
 		}
 		else
-			ProcWaitForSignal(PG_WAIT_BUFFER_PIN);
+			ProcWaitForSignal(WAIT_EVENT_BUFFER_PIN);
 
 		/*
 		 * Remove flag marking us as waiter. Normally this will not be set
diff --git a/src/backend/storage/ipc/standby.c b/src/backend/storage/ipc/standby.c
index 4c06741a69f..cc22d2e87cc 100644
--- a/src/backend/storage/ipc/standby.c
+++ b/src/backend/storage/ipc/standby.c
@@ -840,7 +840,7 @@ ResolveRecoveryConflictWithBufferPin(void)
 	 * SIGHUP signal handler, etc cannot do that because it uses the different
 	 * latch from that ProcWaitForSignal() waits on.
 	 */
-	ProcWaitForSignal(PG_WAIT_BUFFER_PIN);
+	ProcWaitForSignal(WAIT_EVENT_BUFFER_PIN);
 
 	if (got_standby_delay_timeout)
 		SendRecoveryConflictWithBufferPin(PROCSIG_RECOVERY_CONFLICT_BUFFERPIN);