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Heikki Linnakangas 3c0fd64fec Split ProcSleep function into JoinWaitQueue and ProcSleep ... Split ProcSleep into two functions: JoinWaitQueue and ProcSleep. JoinWaitQueue is called while holding the partition lock, and inserts the current process to the wait queue, while ProcSleep() does the actual sleeping. ProcSleep() is now called without holding the partition lock, and it no longer re-acquires the partition lock before returning. That makes the wakeup a little cheaper. Once upon a time, re-acquiring the partition lock was needed to prevent a signal handler from longjmping out at a bad time, but these days our signal handlers just set flags, and longjmping can only happen at points where we explicitly run CHECK_FOR_INTERRUPTS(). If JoinWaitQueue detects an "early deadlock" before even joining the wait queue, it returns without changing the shared lock entry, leaving the cleanup of the shared lock entry to the caller. This makes the handling of an early deadlock the same as the dontWait=true case. One small user-visible side-effect of this refactoring is that we now only set the 'ps' title to say "waiting" when we actually enter the sleep, not when the lock is skipped because dontWait=true, or when a deadlock is detected early before entering the sleep. This eliminates the 'lockAwaited' global variable in proc.c, which was largely redundant with 'awaitedLock' in lock.c Note: Updating the local lock table is now the caller's responsibility. JoinWaitQueue and ProcSleep are now only responsible for modifying the shared state. Seems a little nicer that way. Based on Thomas Munro's earlier patch and observation that ProcSleep doesn't really need to re-acquire the partition lock. Reviewed-by: Maxim Orlov Discussion: https://www.postgresql.org/message-id/7c2090cd-a72a-4e34-afaa-6dd2ef31440e@iki.fi		1 year ago
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backend	Split ProcSleep function into JoinWaitQueue and ProcSleep	1 year ago
bin	pg_combinebackup: Error if incremental file exists in full backup.	1 year ago
common	Optimize sifting down in binaryheap.	1 year ago
fe_utils	pg_verifybackup: Verify tar-format backups.	1 year ago
include	Split ProcSleep function into JoinWaitQueue and ProcSleep	1 year ago
interfaces	Fix incorrect struct reference in comment	1 year ago
makefiles	Add -Wmissing-variable-declarations to the standard compilation flags	1 year ago
pl	Remove unused #include's from contrib, pl, test .c files	1 year ago
port	Fix overflow in bsearch_arg() with more than INT_MAX elements	1 year ago
template	thread-safety: gmtime_r(), localtime_r()	1 year ago
test	Add PG_TEST_EXTRA configure option to the Make builds	1 year ago
timezone	Update time zone data files to tzdata release 2024b.	1 year ago
tools	Make PG_TEST_EXTRA env var override the "meson setup" option	1 year ago
tutorial	…
.gitignore	…
DEVELOPERS	…
Makefile	…
Makefile.global.in	Add PG_TEST_EXTRA configure option to the Make builds	1 year ago
Makefile.shlib	Remove AIX support	2 years ago
meson.build	…
nls-global.mk	…