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Use atomics to adjust filedesc::fd_refcnt.

This commit is contained in:
ad 2007-11-29 18:17:47 +00:00
parent 0e5c3c74c5
commit 1cb3506898
1 changed files with 4 additions and 9 deletions
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13
sys/kern/kern_descrip.c
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@ -1,4 +1,4 @@
/* $NetBSD: kern_descrip.c,v 1.163 2007/11/29 18:15:14 ad Exp $ */
/* $NetBSD: kern_descrip.c,v 1.164 2007/11/29 18:17:47 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 1.163 2007/11/29 18:15:14 ad Exp $");
__KERNEL_RCSID(0, "$NetBSD: kern_descrip.c,v 1.164 2007/11/29 18:17:47 ad Exp $");
#include <sys/param.h>
#include <sys/systm.h>
@ -1240,10 +1240,8 @@ fdshare(struct proc *p1, struct proc *p2)
{
struct filedesc *fdp = p1->p_fd;
rw_enter(&fdp->fd_lock, RW_WRITER);
p2->p_fd = fdp;
fdp->fd_refcnt++;
rw_exit(&fdp->fd_lock);
atomic_inc_uint(&fdp->fd_refcnt);
}
/*
@ -1403,10 +1401,7 @@ fdfree(struct lwp *l)
int i;
fdp = p->p_fd;
rw_enter(&fdp->fd_lock, RW_WRITER);
i = --fdp->fd_refcnt;
rw_exit(&fdp->fd_lock);
if (i > 0)
if (atomic_dec_uint_nv(&fdp->fd_refcnt) > 0)
return;
rw_destroy(&fdp->fd_lock);