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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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6
src/include/miscadmin.h
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@ -12,7 +12,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: miscadmin.h,v 1.92 2001/09/27 16:29:13 tgl Exp $
* $Id: miscadmin.h,v 1.93 2001/09/29 04:02:26 tgl Exp $
*
* NOTES
* some of the information in this file should be moved to
@ -46,8 +46,8 @@
* will be held off until the last matching RESUME_INTERRUPTS() occurs.
*
* Special mechanisms are used to let an interrupt be accepted when we are
* waiting for a lock or spinlock, and when we are waiting for command input
* (but, of course, only if the interrupt holdoff counter is zero). See the
* waiting for a lock or when we are waiting for command input (but, of
* course, only if the interrupt holdoff counter is zero). See the
* related code for details.
*
* A related, but conceptually distinct, mechanism is the "critical section"