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Tom Lane 1c77e99083 Rewrite ConditionVariableBroadcast() to avoid live-lock. ... The original implementation of ConditionVariableBroadcast was, per its self-description, "the dumbest way possible". Thomas Munro found out it was a bit too dumb. An awakened process may immediately re-queue itself, if the specific condition it's waiting for is not yet satisfied. If this happens before ConditionVariableBroadcast is able to see the wait queue as empty, then ConditionVariableBroadcast will re-awaken the same process, repeating the cycle. Given unlucky timing this back-and-forth can repeat indefinitely; loops lasting thousands of seconds have been seen in testing. To fix, add our own process to the end of the wait queue to serve as a sentinel, and exit the broadcast loop once our process is not there anymore. There are various special considerations described in the comments, the principal disadvantage being that wakers can no longer be sure whether they awakened a real waiter or just a sentinel. But in practice nobody pays attention to the result of ConditionVariableSignal or ConditionVariableBroadcast anyway, so that problem seems hypothetical. Back-patch to v10 where condition_variable.c was introduced. Tom Lane and Thomas Munro Discussion: https://postgr.es/m/CAEepm=0NWKehYw7NDoUSf8juuKOPRnCyY3vuaSvhrEWsOTAa3w@mail.gmail.com		9 years ago
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backend	Rewrite ConditionVariableBroadcast() to avoid live-lock.	9 years ago
bin	pg_upgrade: remove C comment	9 years ago
common	Update copyright in recently added files	9 years ago
fe_utils	Phase 3 of pgindent updates.	9 years ago
include	Fix failure to delete spill files of aborted transactions	9 years ago
interfaces	Add post-2010 ecpg tests to checktcp.	9 years ago
makefiles	Always use -fPIC, not -fpic, when building shared libraries with gcc.	9 years ago
pl	Support linking with MinGW-built Perl.	9 years ago
port	Stamp 10.1.	9 years ago
template	Remove "sco" and "unixware" ports.	10 years ago
test	Revert "Fix isolation test to be less timing-dependent"	9 years ago
timezone	Replace raw timezone source data with IANA's new compact format.	9 years ago
tools	Fix use of config-specific libraries for Windows OpenSSL	9 years ago
tutorial	Phase 2 of pgindent updates.	9 years ago
.gitignore	…
DEVELOPERS	…
Makefile	Build src/test/isolation during "make" and "make install".	9 years ago
Makefile.global.in	Be more thorough about cleaning out gcov litter.	9 years ago
Makefile.shlib	Remove support for bcc and msvc standalone libpq builds	9 years ago
nls-global.mk	…