postgresql

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History

Tom Lane d0a89683a3 Two-phase commit. Original patch by Heikki Linnakangas, with additional hacking by Alvaro Herrera and Tom Lane.		2005-06-17 22:32:51 +00:00
..
ipc.c	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
ipci.c	Two-phase commit. Original patch by Heikki Linnakangas, with additional	2005-06-17 22:32:51 +00:00
Makefile	Split the shared-memory array of PGPROC pointers out of the sinval	2005-05-19 21:35:48 +00:00
pmsignal.c	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
procarray.c	Two-phase commit. Original patch by Heikki Linnakangas, with additional	2005-06-17 22:32:51 +00:00
README	$Header: -> $PostgreSQL Changes ...	2003-11-29 19:52:15 +00:00
shmem.c	Modify hash_search() API to prevent future occurrences of the error	2005-05-29 04:23:07 +00:00
shmqueue.c	Tag appropriate files for rc3	2004-12-31 22:04:05 +00:00
sinval.c	Split the shared-memory array of PGPROC pointers out of the sinval	2005-05-19 21:35:48 +00:00
sinvaladt.c	Split the shared-memory array of PGPROC pointers out of the sinval	2005-05-19 21:35:48 +00:00

README

$PostgreSQL: pgsql/src/backend/storage/ipc/README,v 1.4 2003/11/29 19:51:56 pgsql Exp $
Mon Jul 18 11:09:22 PDT 1988  W.KLAS

Cache invalidation synchronization routines:
===========================================

The cache synchronization is done using a message queue. Every
backend can register a message which then has to be read by
all backends. A message read by all backends is removed from the 
queue automatically. If a message has been lost because the buffer
was full, all backends that haven't read this message will be
told that they have to reset their cache state. This is done
at the time when they try to read the message queue.

The message queue is implemented as a shared buffer segment. Actually,
the queue is a circle to allow fast inserting, reading (invalidate data) and
maintaining the buffer.