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.\" $FreeBSD: release/9.1.0/share/man/man9/BUF_ISLOCKED.9 236235 2012-05-29 14:35:51Z gjb $
.\"
.Dd January 22, 2008
.Dt BUF_ISLOCKED 9
.Os
.Sh NAME
.Nm BUF_ISLOCKED
.Nd "returns the state of the lock linked to the buffer"
.Sh SYNOPSIS
.In sys/param.h
.In sys/systm.h
.In sys/uio.h
.In sys/bio.h
.In sys/buf.h
.Ft int
.Fn BUF_ISLOCKED "struct buf *bp"
.Sh DESCRIPTION
The
.Fn BUF_ISLOCKED
function returns the status of the lock linked to the buffer in relation to
curthread.
.Pp
It can return:
.Bl -tag -width ".Dv LK_EXCLUSIVE"
.It Dv LK_EXCLUSIVE
An exclusive lock is held by curthread.
.It Dv LK_EXCLOTHER
An exclusive lock is held by someone other than curthread.
.It Dv LK_SHARED
A shared lock is held.
.It Li 0
The lock is not held by anyone.
.El
.Sh SEE ALSO
.Xr lockstatus 9 ,
.Xr buf 9 ,
.Xr BUF_LOCK 9 ,
.Xr BUF_UNLOCK 9 ,
.Xr lockmgr 9
.Sh AUTHORS
This manual page was written by
.An Attilio Rao Aq attilio@FreeBSD.org .