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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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43
src/backend/bootstrap/bootstrap.c
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@ -8,7 +8,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.116 2001/09/27 16:29:12 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/bootstrap/bootstrap.c,v 1.117 2001/09/29 04:02:22 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@ -33,6 +33,7 @@
#include "catalog/pg_type.h"
#include "libpq/pqsignal.h"
#include "miscadmin.h"
#include "storage/proc.h"
#include "tcop/tcopprot.h"
#include "utils/builtins.h"
#include "utils/exc.h"
@ -360,29 +361,39 @@ BootstrapMain(int argc, char *argv[])
* XLOG operations
*/
SetProcessingMode(NormalProcessing);
if (xlogop == BS_XLOG_NOP)
StartupXLOG();
else if (xlogop == BS_XLOG_BOOTSTRAP)
switch (xlogop)
{
BootStrapXLOG();
StartupXLOG();
}
else
{
if (xlogop == BS_XLOG_CHECKPOINT)
{
case BS_XLOG_NOP:
StartupXLOG();
break;
case BS_XLOG_BOOTSTRAP:
BootStrapXLOG();
StartupXLOG();
break;
case BS_XLOG_CHECKPOINT:
if (IsUnderPostmaster)
InitDummyProcess(); /* needed to get LWLocks */
CreateDummyCaches();
CreateCheckPoint(false);
SetRedoRecPtr();
}
else if (xlogop == BS_XLOG_STARTUP)
proc_exit(0); /* done */
case BS_XLOG_STARTUP:
StartupXLOG();
else if (xlogop == BS_XLOG_SHUTDOWN)
proc_exit(0); /* done */
case BS_XLOG_SHUTDOWN:
ShutdownXLOG();
else
proc_exit(0); /* done */
default:
elog(STOP, "Unsupported XLOG op %d", xlogop);
proc_exit(0);
proc_exit(0);
}
SetProcessingMode(BootstrapProcessing);
/*