postgresql

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History

Bruce Momjian ede3b762a3 Back out win32 patch so we can apply it separately.		2004-01-26 22:54:58 +00:00
..
ipc.c	This patch properly sets the prototype for the on_shmem_exit and	2003-12-12 18:45:10 +00:00
ipci.c	Back out win32 patch so we can apply it separately.	2004-01-26 22:54:58 +00:00
Makefile	$Header: -> $PostgreSQL Changes ...	2003-11-29 19:52:15 +00:00
pmsignal.c	Back out win32 patch so we can apply it separately.	2004-01-26 22:54:58 +00:00
README	$Header: -> $PostgreSQL Changes ...	2003-11-29 19:52:15 +00:00
shmem.c	Drops in the CreateProcess calls for Win32 (essentially wrapping up the	2004-01-11 03:49:31 +00:00
shmqueue.c	$Header: -> $PostgreSQL Changes ...	2003-11-29 19:52:15 +00:00
sinval.c	$Header: -> $PostgreSQL Changes ...	2003-11-29 19:52:15 +00:00
sinvaladt.c	This patch is the next step towards (re)allowing fork/exec.	2003-12-20 17:31:21 +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.