Robert Haas daa7527afc Reduce the number of semaphores used under --disable-spinlocks. ... Instead of allocating a semaphore from the operating system for every spinlock, allocate a fixed number of semaphores (by default, 1024) from the operating system and multiplex all the spinlocks that get created onto them. This could self-deadlock if a process attempted to acquire more than one spinlock at a time, but since processes aren't supposed to execute anything other than short stretches of straight-line code while holding a spinlock, that shouldn't happen. One motivation for this change is that, with the introduction of dynamic shared memory, it may be desirable to create spinlocks that last for less than the lifetime of the server. Without this change, attempting to use such facilities under --disable-spinlocks would quickly exhaust any supply of available semaphores. Quite apart from that, it's desirable to contain the quantity of semaphores needed to run the server simply on convenience grounds, since using too many may make it harder to get PostgreSQL running on a new platform, which is mostly the point of --disable-spinlocks in the first place. Patch by me; review by Tom Lane.		2014-01-08 18:58:00 -05:00
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access	Update copyright for 2014	2014-01-07 16:05:30 -05:00
bootstrap	Update copyright for 2014	2014-01-07 16:05:30 -05:00
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foreign	Update copyright for 2014	2014-01-07 16:05:30 -05:00
lib	Update copyright for 2014	2014-01-07 16:05:30 -05:00
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optimizer	Update copyright for 2014	2014-01-07 16:05:30 -05:00
parser	Update copyright for 2014	2014-01-07 16:05:30 -05:00
port	Get rid of use of asprintf() in favor of a more portable implementation.	2013-10-22 18:42:13 -04:00
portability	Update copyright for 2014	2014-01-07 16:05:30 -05:00
postmaster	Update copyright for 2014	2014-01-07 16:05:30 -05:00
regex	Update copyright for 2014	2014-01-07 16:05:30 -05:00
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rewrite	Update copyright for 2014	2014-01-07 16:05:30 -05:00
snowball	Update copyright for 2014	2014-01-07 16:05:30 -05:00
storage	Reduce the number of semaphores used under --disable-spinlocks.	2014-01-08 18:58:00 -05:00
tcop	Update copyright for 2014	2014-01-07 16:05:30 -05:00
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utils	Update copyright for 2014	2014-01-07 16:05:30 -05:00
.gitignore	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00
c.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
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funcapi.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
getaddrinfo.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
getopt_long.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
Makefile	Remove maintainer-check target, fold into normal build	2013-10-10 20:11:56 -04:00
miscadmin.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
pg_config_ext.h.in	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00
pg_config_ext.h.win32	Autoconfiscate selection of 64-bit int type for 64-bit large object API.	2012-10-07 21:52:43 -04:00
pg_config_manual.h	Reduce the number of semaphores used under --disable-spinlocks.	2014-01-08 18:58:00 -05:00
pg_config.h.in	Undo autoconf 2.69's attempt to #define _DARWIN_USE_64_BIT_INODE.	2013-12-29 12:57:56 -05:00
pg_config.h.win32	Remove use of obsolescent Autoconf macros	2013-11-30 09:17:08 -05:00
pg_trace.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
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pgtime.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
port.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
postgres_ext.h	Provide database object names as separate fields in error messages.	2013-01-29 17:08:26 -05:00
postgres_fe.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
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rusagestub.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00
windowapi.h	Update copyright for 2014	2014-01-07 16:05:30 -05:00