Commitde2b384

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Wake up interested backends when a checkpoint fails.

Commitc6c9474 switched to condition variables instead of sleeploops to notify backends of checkpoint start and stop, but forgotto broadcast in case of checkpoint failure.Author: Thomas MunroDiscussion:https://postgr.es/m/CA%2BhUKGJKbCd%2B_K%2BSEBsbHxVT60SG0ivWHHAdvL0bLTUt2xpA2w%40mail.gmail.com

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Original file line number	Diff line number	Diff line change
`@@ -279,6 +279,8 @@ CheckpointerMain(void)`
`279`	`279`	`CheckpointerShmem->ckpt_done=CheckpointerShmem->ckpt_started;`
`280`	`280`	`SpinLockRelease(&CheckpointerShmem->ckpt_lck);`
`281`	`281`
	`282`	`+ConditionVariableBroadcast(&CheckpointerShmem->done_cv);`
	`283`	`+`
`282`	`284`	`ckpt_active= false;`
`283`	`285`	`}`
`284`	`286`

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