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Fix race condition when changing synchronous_standby_names

A momentary window exists when synchronous_standby_nameschanges that allows commands issued after the change tocontinue to act as async until the change becomes visible.Remove the race by using more appropriate test in syncrep.cAuthor: Asim Rama Praveen and Ashwin AgrawalReported-by: Xin Zhang, Ashwin Agrawal, and Asim Rama PraveenReviewed-by: Michael Paquier, Masahiko Sawada

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src/backend/replication
- syncrep.c

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`‎src/backend/replication/syncrep.c‎`

Lines changed: 2 additions & 4 deletions

Original file line number	Diff line number	Diff line change
`@@ -156,11 +156,9 @@ SyncRepWaitForLSN(XLogRecPtr lsn, bool commit)`
`156`	`156`	`mode=Min(SyncRepWaitMode,SYNC_REP_WAIT_FLUSH);`
`157`	`157`
`158`	`158`	`/*`
`159`		`- * Fast exit if user has not requested sync replication, or there are no`
`160`		`- * sync replication standby names defined. Note that those standbys don't`
`161`		`- * need to be connected.`
	`159`	`+ * Fast exit if user has not requested sync replication.`
`162`	`160`	`*/`
`163`		`-if (!SyncRepRequested()\|\| !SyncStandbysDefined())`
	`161`	`+if (!SyncRepRequested())`
`164`	`162`	`return;`
`165`	`163`
`166`	`164`	`Assert(SHMQueueIsDetached(&(MyProc->syncRepLinks)));`

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Commit48c9f49

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`‎src/backend/replication/syncrep.c‎`

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