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Use atomics to adjust cwdi_refcnt.

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This commit is contained in:
ad 2007-11-29 18:15:14 +00:00
parent e9e11b98df
commit 6182ac0595
2 changed files with 7 additions and 12 deletions
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15
sys/kern/kern_descrip.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_descrip.c,v 1.162 2007/11/07 00:23:20 ad Exp $ */
/* $NetBSD: kern_descrip.c,v 1.163 2007/11/29 18:15:14 ad Exp $ */
/*
* Copyright (c) 1982, 1986, 1989, 1991, 1993
@ -37,7 +37,7 @@
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: kern_descrip.c,v 1.162 2007/11/07 00:23:20 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_descrip.c,v 1.163 2007/11/29 18:15:14 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -60,6 +60,7 @@ __KERNEL_RCSID(0, "$NetBSD: kern_descrip.c,v 1.162 2007/11/07 00:23:20 ad Exp $"
#include <sys/conf.h>
#include <sys/event.h>
#include <sys/kauth.h>
#include <sys/atomic.h>
#include <sys/mount.h>
#include <sys/syscallargs.h>
@ -1156,9 +1157,7 @@ cwdshare(struct proc *p1, struct proc *p2)
{
struct cwdinfo *cwdi = p1->p_cwdi;
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
cwdi->cwdi_refcnt++;
rw_exit(&cwdi->cwdi_lock);
atomic_inc_uint(&cwdi->cwdi_refcnt);
p2->p_cwdi = cwdi;
}
@ -1186,12 +1185,8 @@ cwdunshare(struct proc *p)
void
cwdfree(struct cwdinfo *cwdi)
{
int n;
rw_enter(&cwdi->cwdi_lock, RW_WRITER);
n = --cwdi->cwdi_refcnt;
rw_exit(&cwdi->cwdi_lock);
if (n > 0)
if (atomic_dec_uint_nv(&cwdi->cwdi_refcnt) > 0)
return;
vrele(cwdi->cwdi_cdir);

4
sys/sys/filedesc.h
View File

@ -1,4 +1,4 @@
/* $NetBSD: filedesc.h,v 1.41 2007/10/08 15:12:11 ad Exp $ */
/* $NetBSD: filedesc.h,v 1.42 2007/11/29 18:15:14 ad Exp $ */
/*
* Copyright (c) 1990, 1993
@ -92,7 +92,7 @@ struct cwdinfo {
struct vnode *cwdi_edir; /* emulation root (if known) */
krwlock_t cwdi_lock; /* lock on entire struct */
u_short cwdi_cmask; /* mask for file creation */
u_short cwdi_refcnt; /* reference count */
u_int cwdi_refcnt; /* reference count */
};