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Tom Lane 13db3b9363 Allow ConditionVariable[PrepareTo]Sleep to auto-switch between CVs. ... The original coding here insisted that callers manually cancel any prepared sleep for one condition variable before starting a sleep on another one. While that's not a huge burden today, it seems like a gotcha that will bite us in future if the use of condition variables increases; anything we can do to make the use of this API simpler and more robust is attractive. Hence, allow these functions to automatically switch their attention to a different CV when required. This is safe for the same reason it was OK for commit aced5a92b to let a broadcast operation cancel any prepared CV sleep: whenever we return to the other test-and-sleep loop, we will automatically re-prepare that CV, paying at most an extra test of that loop's exit condition. Back-patch to v10 where condition variables were introduced. Ordinarily we would probably not back-patch a change like this, but since it does not invalidate any coding pattern that was legal before, it seems safe enough. Furthermore, there's an open bug in replorigin_drop() for which the simplest fix requires this. Even if we chose to fix that in some more complicated way, the hazard would remain that we might back-patch some other bug fix that requires this behavior. Patch by me, reviewed by Thomas Munro. Discussion: https://postgr.es/m/2437.1515368316@sss.pgh.pa.us		8 years ago
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backend	Allow ConditionVariable[PrepareTo]Sleep to auto-switch between CVs.	8 years ago
bin	Improve scripting language in pgbench	8 years ago
common	Update copyright for 2018	8 years ago
fe_utils	Update copyright for 2018	8 years ago
include	Allow ConditionVariable[PrepareTo]Sleep to auto-switch between CVs.	8 years ago
interfaces	Another attempt at fixing build with various OpenSSL versions	8 years ago
makefiles	Always use -fPIC, not -fpic, when building shared libraries with gcc.	9 years ago
pl	Update copyright for 2018	8 years ago
port	Update copyright for 2018	8 years ago
template	Force "restrict" not to be used when compiling with xlc.	8 years ago
test	Add TIMELINE to backup_label file	8 years ago
timezone	Update copyright for 2018	8 years ago
tools	Fix use of config-specific libraries for Windows OpenSSL	8 years ago
tutorial	Update copyright for 2018	8 years ago
.gitignore	…
DEVELOPERS	…
Makefile	Build src/test/isolation during "make" and "make install".	8 years ago
Makefile.global.in	Convert documentation to DocBook XML	8 years ago
Makefile.shlib	…
nls-global.mk	…