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Replace the pg_listener-based LISTEN/NOTIFY mechanism with an in-memory queue.

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In addition, add support for a "payload" string to be passed along with
each notify event.

This implementation should be significantly more efficient than the old one,
and is also more compatible with Hot Standby usage.  There is not yet any
facility for HS slaves to receive notifications generated on the master,
although such a thing is possible in future.

Joachim Wieland, reviewed by Jeff Davis; also hacked on by me.
This commit is contained in:
Tom Lane
2010-02-16 22:34:57 +00:00
parent fc5173ad51
commit d1e027221d
37 changed files with 1831 additions and 744 deletions
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5
src/backend/storage/ipc/ipci.c
View File

@@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.103 2010/01/15 09:19:03 heikki Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/ipci.c,v 1.104 2010/02/16 22:34:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -20,6 +20,7 @@
#include "access/nbtree.h"
#include "access/subtrans.h"
#include "access/twophase.h"
#include "commands/async.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "postmaster/autovacuum.h"
@@ -122,6 +123,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
size = add_size(size, WalRcvShmemSize());
size = add_size(size, BTreeShmemSize());
size = add_size(size, SyncScanShmemSize());
size = add_size(size, AsyncShmemSize());
#ifdef EXEC_BACKEND
size = add_size(size, ShmemBackendArraySize());
#endif
@@ -225,6 +227,7 @@ CreateSharedMemoryAndSemaphores(bool makePrivate, int port)
*/
BTreeShmemInit();
SyncScanShmemInit();
AsyncShmemInit();
#ifdef EXEC_BACKEND

6
src/backend/storage/lmgr/lwlock.c
View File

@@ -15,7 +15,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.55 2010/01/02 16:57:52 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/lmgr/lwlock.c,v 1.56 2010/02/16 22:34:50 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -24,6 +24,7 @@
#include "access/clog.h"
#include "access/multixact.h"
#include "access/subtrans.h"
#include "commands/async.h"
#include "miscadmin.h"
#include "pg_trace.h"
#include "storage/ipc.h"
@@ -174,6 +175,9 @@ NumLWLocks(void)
/* multixact.c needs two SLRU areas */
numLocks += NUM_MXACTOFFSET_BUFFERS + NUM_MXACTMEMBER_BUFFERS;
/* async.c needs one per Async buffer */
numLocks += NUM_ASYNC_BUFFERS;
/*
* Add any requested by loadable modules; for backwards-compatibility
* reasons, allocate at least NUM_USER_DEFINED_LWLOCKS of them even if