Проект OpenNet: MAN vhold (9) Ядро (FreeBSD и Linux)

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vhold (9)

>> vhold (9) ( FreeBSD man: Ядро )

BSD mandoc

NAME



vhold , vdrop , vdropl

 - acquire/release a hold on a vnode

SYNOPSIS

#include <sys/param.h>
#include <sys/vnode.h>
void vhold (struct vnode *vp);
void vdrop (struct vnode *vp);
void vdropl (struct vnode *vp);

DESCRIPTION

The vhold ();
function increments the v_holdcnt of the given vnode. If the vnode has already been added to the free list and is still referenced, it will be removed.

The vdrop ();
and vdropl ();
functions decrement the v_holdcnt of the vnode. If the holdcount is less than or equal to zero prior to calling vdrop ();
or vdropl (,);
the system will panic. If the vnode is no longer referenced, it will be freed.

The difference between vdrop ();
and vdropl ();
is that vdrop ();
locks the vnode interlock and then calls vdropl ();
while vdropl ();
expects the interlock to already be locked.

AUTHORS

This manual page was written by An Chad David Aq [email protected] .