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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.		17 years ago
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backend	Install a "dead man switch" to allow the postmaster to detect cases where	17 years ago
bin	Code review for \df rewrite: fix assorted bugs, make type and	17 years ago
include	Install a "dead man switch" to allow the postmaster to detect cases where	17 years ago
interfaces	Fix already-obsolete hint message ... sslverify parameter is no more.	17 years ago
makefiles	Allow out-of-tree builds on mingw and cygwin	17 years ago
pl	Fix plpgsql's EXIT so that an EXIT without a label only matches a loop,	17 years ago
port	Update no longer current comments in header.	17 years ago
template	Tweak configure to attempt to add -qnoansialias to CFLAGS whenever running	17 years ago
test	Disable the use of Unicode escapes in string constants (U&'') when	17 years ago
timezone	Update time zone data files to tzdata release 2009e: DST law changes in	17 years ago
tools	Replace a couple of references to files that no longer exist in the source	17 years ago
tutorial	Update copyright for 2009.	17 years ago
DEVELOPERS	Replace a couple of references to files that no longer exist in the source	17 years ago
Makefile	Add the possibility to specify an explicit validator function for foreign-data	17 years ago
Makefile.global.in	Add an implicit rule %.c -> %.i for running the C preprocessor.	17 years ago
Makefile.shlib	Allow out-of-tree builds on mingw and cygwin	17 years ago
bcc32.mak	…
nls-global.mk	Do not msgmerge against /dev/null; merge against the pot file itself	17 years ago
win32.mak	…