From de2b38419c4018fc8c2c917cc2cc752063096cfb Mon Sep 17 00:00:00 2001
From: Thomas Munro <tmunro@postgresql.org>
Date: Sat, 6 Apr 2019 09:31:48 +1300
Subject: [PATCH] Wake up interested backends when a checkpoint fails.

Commit c6c9474a switched to condition variables instead of sleep
loops to notify backends of checkpoint start and stop, but forgot
to broadcast in case of checkpoint failure.

Author: Thomas Munro
Discussion: https://postgr.es/m/CA%2BhUKGJKbCd%2B_K%2BSEBsbHxVT60SG0ivWHHAdvL0bLTUt2xpA2w%40mail.gmail.com
---
 src/backend/postmaster/checkpointer.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/backend/postmaster/checkpointer.c b/src/backend/postmaster/checkpointer.c
index d303ce36794..a1e04239ad0 100644
--- a/src/backend/postmaster/checkpointer.c
+++ b/src/backend/postmaster/checkpointer.c
@@ -279,6 +279,8 @@ CheckpointerMain(void)
 			CheckpointerShmem->ckpt_done = CheckpointerShmem->ckpt_started;
 			SpinLockRelease(&CheckpointerShmem->ckpt_lck);
 
+			ConditionVariableBroadcast(&CheckpointerShmem->done_cv);
+
 			ckpt_active = false;
 		}