Andres Freund a39e78b710 Block signals while computing the sleep time in postmaster's main loop. ... DetermineSleepTime() was previously called without blocked signals. That's not good, because it allows signal handlers to interrupt its workings. DetermineSleepTime() was added in 9.3 with the addition of background workers (da07a1e856), where it only read from BackgroundWorkerList. Since 9.4, where dynamic background workers were added (7f7485a0cd), the list is also manipulated in DetermineSleepTime(). That's bad because the list now can be persistently corrupted if modified by both a signal handler and DetermineSleepTime(). This was discovered during the investigation of hangs on buildfarm member anole. It's unclear whether this bug is the source of these hangs or not, but it's worth fixing either way. I have confirmed that it can cause crashes. It luckily looks like this only can cause problems when bgworkers are actively used. Discussion: 20140929193733.GB14400@awork2.anarazel.de Backpatch to 9.3 where background workers were introduced.		2014-10-01 15:19:40 +02:00
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autovacuum.c	Avoid wholesale autovacuuming when autovacuum is nominally off.	2014-07-30 14:41:35 -04:00
bgworker.c	When a background worker exists with code 0, unregister it.	2014-05-07 17:44:42 -04:00
bgwriter.c	pgindent run for 9.4	2014-05-06 12:12:18 -04:00
checkpointer.c	Fix and enhance the assertion of no palloc's in a critical section.	2014-06-30 10:26:00 +03:00
fork_process.c	Break out OpenSSL-specific code to separate files.	2014-08-11 11:54:19 +03:00
Makefile	Allow background workers to be started dynamically.	2013-07-16 13:02:15 -04:00
pgarch.c	pgindent run for 9.4	2014-05-06 12:12:18 -04:00
pgstat.c	Smooth reporting of commit/rollback statistics.	2014-07-02 15:20:30 -05:00
postmaster.c	Block signals while computing the sleep time in postmaster's main loop.	2014-10-01 15:19:40 +02:00
startup.c	pgindent run for 9.4	2014-05-06 12:12:18 -04:00
syslogger.c	Fix unportable setvbuf() usage in initdb.	2014-05-15 15:57:54 -04:00
walwriter.c	pgindent run for 9.4	2014-05-06 12:12:18 -04:00