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Implement new 'lightweight lock manager' that's intermediate between

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existing lock manager and spinlocks: it understands exclusive vs shared
lock but has few other fancy features.  Replace most uses of spinlocks
with lightweight locks.  All remaining uses of spinlocks have very short
lock hold times (a few dozen instructions), so tweak spinlock backoff
code to work efficiently given this assumption.  All per my proposal on
pghackers 26-Sep-01.
This commit is contained in:
Tom Lane
2001-09-29 04:02:27 +00:00
parent 818fb55ac4
commit 499abb0c0f
46 changed files with 1595 additions and 1355 deletions
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4
src/backend/utils/misc/guc.c
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@ -4,7 +4,7 @@
* Support for grand unified configuration scheme, including SET
* command, configuration file, and command line options.
*
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.52 2001/09/23 21:52:36 petere Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/misc/guc.c,v 1.53 2001/09/29 04:02:25 tgl Exp $
*
* Copyright 2000 by PostgreSQL Global Development Group
* Written by Peter Eisentraut <peter_e@gmx.net>.
@ -240,7 +240,7 @@ static struct config_bool
#ifdef LOCK_DEBUG
{"trace_locks", PGC_SUSET, &Trace_locks, false, NULL},
{"trace_userlocks", PGC_SUSET, &Trace_userlocks, false, NULL},
{"trace_spinlocks", PGC_SUSET, &Trace_spinlocks, false, NULL},
{"trace_lwlocks", PGC_SUSET, &Trace_lwlocks, false, NULL},
{"debug_deadlocks", PGC_SUSET, &Debug_deadlocks, false, NULL},
#endif