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

diff --git a/src/backend/postmaster/checkpointer.c b/src/backend/postmaster/checkpointer.c
index d303ce367945ef57d19f73de2781a6106018ea3c..a1e04239ad0bfec5f12eefcb47f1789afa549a34 100644 (file)
--- 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;
        }