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2afacfc403
postgresql/src/backend/storage/ipc
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Peter Eisentraut 2afacfc403 This patch properly sets the prototype for the on_shmem_exit and 
on_proc_exit functions, and adjust all other related code to use
the proper types too.

by Kurt Roeckx
2003-12-12 18:45:10 +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 Try to reduce confusion about what is a lock method identifier, a lock 2003-12-01 21:59:25 +00:00
Makefile $Header: -> $PostgreSQL Changes ... 2003-11-29 19:52:15 +00:00
pmsignal.c $Header: -> $PostgreSQL Changes ... 2003-11-29 19:52:15 +00:00
README $Header: -> $PostgreSQL Changes ... 2003-11-29 19:52:15 +00:00
shmem.c $Header: -> $PostgreSQL Changes ... 2003-11-29 19:52:15 +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 $Header: -> $PostgreSQL Changes ... 2003-11-29 19:52:15 +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.