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postgresql/src/backend/storage/ipc
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Bruce Momjian 089003fb46 pgindent run.
2003-08-04 00:43:34 +00:00
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ipc.c pgindent run. 2003-08-04 00:43:34 +00:00
ipci.c pgindent run. 2003-08-04 00:43:34 +00:00
Makefile Merge three existing ways of signaling postmaster from child processes, 2001-11-04 19:55:31 +00:00
pmsignal.c Update copyright to 2002. 2002-06-20 20:29:54 +00:00
README Error message editing in backend/storage. 2003-07-24 22:04:15 +00:00
shmem.c Error message editing in backend/storage. 2003-07-24 22:04:15 +00:00
shmqueue.c Make debug_ GUC varables output DEBUG1 rather than LOG, and mention in 2003-05-27 17:49:47 +00:00
sinval.c pgindent run. 2003-08-04 00:43:34 +00:00
sinvaladt.c Error message editing in backend/storage. 2003-07-24 22:04:15 +00:00

README 

$Header: /cvsroot/pgsql/src/backend/storage/ipc/README,v 1.3 2003/07/24 22:04:09 tgl 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.