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Fix SIGUSR1 handling by unconnected bgworkers

Latch activity was not being detected by non-database-connected workers; theSIGUSR1 signal handler which is normally in charge of that was set to SIG_IGN.Create a simple handler to call latch_sigusr1_handler instead.Robert Haas (bug report and suggested fix)

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src/backend/postmaster
- postmaster.c

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+17

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`‎src/backend/postmaster/postmaster.c`

Lines changed: 17 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -5354,6 +5354,22 @@ bgworker_die(SIGNAL_ARGS)`
`5354`	`5354`	`MyBgworkerEntry->bgw_name)));`
`5355`	`5355`	`}`
`5356`	`5356`
	`5357`	`+/*`
	`5358`	`+ * Standard SIGUSR1 handler for unconnected workers`
	`5359`	`+ *`
	`5360`	`+ * Here, we want to make sure an unconnected worker will at least heed`
	`5361`	`+ * latch activity.`
	`5362`	`+ */`
	`5363`	`+staticvoid`
	`5364`	`+bgworker_sigusr1_handler(SIGNAL_ARGS)`
	`5365`	`+{`
	`5366`	`+intsave_errno=errno;`
	`5367`	`+`
	`5368`	`+latch_sigusr1_handler();`
	`5369`	`+`
	`5370`	`+errno=save_errno;`
	`5371`	`+}`
	`5372`	`+`
`5357`	`5373`	`staticvoid`
`5358`	`5374`	`do_start_bgworker(void)`
`5359`	`5375`	`{`
`@@ -5410,7 +5426,7 @@ do_start_bgworker(void)`
`5410`	`5426`	`else`
`5411`	`5427`	`{`
`5412`	`5428`	`pqsignal(SIGINT,SIG_IGN);`
`5413`		`-pqsignal(SIGUSR1,SIG_IGN);`
	`5429`	`+pqsignal(SIGUSR1,bgworker_sigusr1_handler);`
`5414`	`5430`	`pqsignal(SIGFPE,SIG_IGN);`
`5415`	`5431`	`}`
`5416`	`5432`

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Commitf62ab62

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`‎src/backend/postmaster/postmaster.c`

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