diff options
| author | Tom Lane | 2010-02-16 22:34:57 +0000 |
|---|---|---|
| committer | Tom Lane | 2010-02-16 22:34:57 +0000 |
| commit | d1e027221d0243b7b57eabb0e482923dd7d1c8eb (patch) | |
| tree | 034988b788248c88fad3b73fb4d8d1afff2dd509 /src/backend/storage/lmgr/lwlock.c | |
| parent | fc5173ad514a216dc93bc190dbba3751024a257d (diff) | |
Replace the pg_listener-based LISTEN/NOTIFY mechanism with an in-memory queue.
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.
Diffstat (limited to 'src/backend/storage/lmgr/lwlock.c')
| -rw-r--r-- | src/backend/storage/lmgr/lwlock.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/src/backend/storage/lmgr/lwlock.c b/src/backend/storage/lmgr/lwlock.c index 4e635d1e8aa..7a6cab968bb 100644 --- a/src/backend/storage/lmgr/lwlock.c +++ b/src/backend/storage/lmgr/lwlock.c @@ -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 |