Aren/NetBSD
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Define/use MUTEX_COUNT_BIAS for those implementations that need one (like

Browse Source 
vax).
This commit is contained in:
matt 2007-03-12 02:19:14 +00:00
parent 11957bf405
commit 57257364a0
1 changed files with 7 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
sys/kern/kern_mutex.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: kern_mutex.c,v 1.11 2007/03/10 16:01:13 ad Exp $ */
/* $NetBSD: kern_mutex.c,v 1.12 2007/03/12 02:19:14 matt Exp $ */
/*-
* Copyright (c) 2002, 2006, 2007 The NetBSD Foundation, Inc.
@ -49,7 +49,7 @@
#define __MUTEX_PRIVATE
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_mutex.c,v 1.11 2007/03/10 16:01:13 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_mutex.c,v 1.12 2007/03/12 02:19:14 matt Exp $");
#include <sys/param.h>
#include <sys/proc.h>
@ -120,6 +120,9 @@ do { \
/*
* Spin mutex SPL save / restore.
*/
#ifndef MUTEX_COUNT_BIAS
#define MUTEX_COUNT_BIAS 0
#endif
#define MUTEX_SPIN_SPLRAISE(mtx) \
do { \
@ -127,7 +130,7 @@ do { \
int x__cnt, s; \
x__cnt = x__ci->ci_mtx_count--; \
s = splraiseipl(mtx->mtx_ipl); \
if (x__cnt == 0) \
if (x__cnt == MUTEX_COUNT_BIAS) \
x__ci->ci_mtx_oldspl = (s); \
} while (/* CONSTCOND */ 0)
@ -136,7 +139,7 @@ do { \
struct cpu_info *x__ci = curcpu(); \
int s = x__ci->ci_mtx_oldspl; \
__insn_barrier(); \
if (++(x__ci->ci_mtx_count) == 0) \
if (++(x__ci->ci_mtx_count) == MUTEX_COUNT_BIAS) \
splx(s); \
} while (/* CONSTCOND */ 0)