postgresql

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History

Tom Lane 3ff58b48c9 Put back another not-so-unnecessary #include, per report from Hiroshi Saito.		2006-07-16 01:05:23 +00:00
..
ipc.c	Fix a passel of recently-committed violations of the rule 'thou shalt	2006-07-14 05:28:29 +00:00
ipci.c	Put back some more not-so-unused-as-all-that #includes. This un-breaks	2006-07-15 15:47:17 +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	Put back another not-so-unnecessary #include, per report from Hiroshi Saito.	2006-07-16 01:05:23 +00:00
procarray.c	Remove 576 references of include files that were not needed.	2006-07-14 14:52:27 +00:00
README	$Header: -> $PostgreSQL Changes ...	2003-11-29 19:52:15 +00:00
shmem.c	Remove 576 references of include files that were not needed.	2006-07-14 14:52:27 +00:00
shmqueue.c	Update copyright for 2006. Update scripts.	2006-03-05 15:59:11 +00:00
sinval.c	Remove 576 references of include files that were not needed.	2006-07-14 14:52:27 +00:00
sinvaladt.c	Update copyright for 2006. Update scripts.	2006-03-05 15:59:11 +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.