Tom Lane 969d7cd431 Install a "dead man switch" to allow the postmaster to detect cases where ... a backend has done exit(0) or exit(1) without having disengaged itself from shared memory. We are at risk for this whenever third-party code is loaded into a backend, since such code might not know it's supposed to go through proc_exit() instead. Also, it is reported that under Windows there are ways to externally kill a process that cause the status code returned to the postmaster to be indistinguishable from a voluntary exit (thank you, Microsoft). If this does happen then the system is probably hosed --- for instance, the dead session might still be holding locks. So the best recovery method is to treat this like a backend crash. The dead man switch is armed for a particular child process when it acquires a regular PGPROC, and disarmed when the PGPROC is released; these should be the first and last touches of shared memory resources in a backend, or close enough anyway. This choice means there is no coverage for auxiliary processes, but I doubt we need that, since they shouldn't be executing any user-provided code anyway. This patch also improves the management of the EXEC_BACKEND ShmemBackendArray array a bit, by reducing search costs. Although this problem is of long standing, the lack of field complaints seems to mean it's not critical enough to risk back-patching; at least not till we get some more testing of this mechanism.		2009-05-05 19:59:00 +00:00
..
backend	Install a "dead man switch" to allow the postmaster to detect cases where	2009-05-05 19:59:00 +00:00
bin	Code review for \df rewrite: fix assorted bugs, make type and	2009-05-05 02:29:06 +00:00
include	Install a "dead man switch" to allow the postmaster to detect cases where	2009-05-05 19:59:00 +00:00
interfaces	Fix already-obsolete hint message ... sslverify parameter is no more.	2009-05-03 17:16:58 +00:00
makefiles
pl	Fix plpgsql's EXIT so that an EXIT without a label only matches a loop,	2009-05-02 17:27:57 +00:00
port	Update no longer current comments in header.	2009-05-04 09:30:06 +00:00
template
test	Disable the use of Unicode escapes in string constants (U&'') when	2009-05-05 18:32:17 +00:00
timezone	Update time zone data files to tzdata release 2009e: DST law changes in	2009-04-09 20:50:42 +00:00
tools	Replace a couple of references to files that no longer exist in the source	2009-05-04 08:08:47 +00:00
tutorial
bcc32.mak
DEVELOPERS	Replace a couple of references to files that no longer exist in the source	2009-05-04 08:08:47 +00:00
Makefile	Add the possibility to specify an explicit validator function for foreign-data	2009-02-24 10:06:36 +00:00
Makefile.global.in
Makefile.shlib
nls-global.mk
win32.mak