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Ignore WL_POSTMASTER_DEATH latch event in single user mode

Otherwise code that uses this will abort with an assertion failure,because postmaster_alive_fds are not initialized.Reported-by: tushar <tushar.ahuja@enterprisedb.com>

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src/backend/storage/ipc
- latch.c

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`‎src/backend/storage/ipc/latch.c`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -370,7 +370,7 @@ WaitLatchOrSocket(volatile Latch *latch, int wakeEvents, pgsocket sock,`
`370`	`370`	`AddWaitEventToSet(set,WL_LATCH_SET,PGINVALID_SOCKET,`
`371`	`371`	`(Latch*)latch,NULL);`
`372`	`372`
`373`		`-if (wakeEvents&WL_POSTMASTER_DEATH)`
	`373`	`+if (wakeEvents&WL_POSTMASTER_DEATH&&IsUnderPostmaster)`
`374`	`374`	`AddWaitEventToSet(set,WL_POSTMASTER_DEATH,PGINVALID_SOCKET,`
`375`	`375`	`NULL,NULL);`
`376`	`376`

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Commit06bfb80

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`‎src/backend/storage/ipc/latch.c`

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