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Andres Freund 6753333f55 Move deadlock and other interrupt handling in proc.c out of signal handlers. ... Deadlock checking was performed inside signal handlers up to now. While it's a remarkable feat to have made this work reliably, it's quite complex to understand why that is the case. Partially it worked due to the assumption that semaphores are signal safe - which is not actually documented to be the case for sysv semaphores. The reason we had to rely on performing this work inside signal handlers is that semaphores aren't guaranteed to be interruptable by signals on all platforms. But now that latches provide a somewhat similar API, which actually has the guarantee of being interruptible, we can avoid doing so. Signalling between ProcSleep, ProcWakeup, ProcWaitForSignal and ProcSendSignal is now done using latches. This increases the likelihood of spurious wakeups. As spurious wakeup already were possible and aren't likely to be frequent enough to be an actual problem, this seems acceptable. This change would allow for further simplification of the deadlock checking, now that it doesn't have to run in a signal handler. But even if I were motivated to do so right now, it would still be better to do that separately. Such a cleanup shouldn't have to be reviewed a the same time as the more fundamental changes in this commit. There is one possible usability regression due to this commit. Namely it is more likely than before that log_lock_waits messages are output more than once. Reviewed-By: Heikki Linnakangas		11 years ago
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backend	Move deadlock and other interrupt handling in proc.c out of signal handlers.	11 years ago
bin	Add API functions to libpq to interrogate SSL related stuff.	11 years ago
common	Fix libpq's behavior when /etc/passwd isn't readable.	12 years ago
include	Move deadlock and other interrupt handling in proc.c out of signal handlers.	11 years ago
interfaces	Add API functions to libpq to interrogate SSL related stuff.	11 years ago
makefiles	Revert haphazard pgxs makefile changes	12 years ago
pl	Translation updates	12 years ago
port	port/snprintf(): fix overflow and do padding	12 years ago
template	Remove duplicate specification of -Ae for HP-UX C compiler.	12 years ago
test	Remove unused "m" field in LSEG.	11 years ago
timezone	Update time zone data files to tzdata release 2015a.	12 years ago
tools	tools/ccsym: update for modern versions of gcc	12 years ago
tutorial	Update copyright for 2015	12 years ago
.gitignore	…
DEVELOPERS	…
Makefile	…
Makefile.global.in	Fix installcheck case for tap tests	12 years ago
Makefile.shlib	Install shared libraries also in bin on cygwin, mingw	12 years ago
bcc32.mak	…
nls-global.mk	…
win32.mak	…