70 lines
2.3 KiB
Groff
70 lines
2.3 KiB
Groff
.\"
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.\" Copyright (C) 2008 Attilio Rao <attilio@FreeBSD.org>
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.\" All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice(s), this list of conditions and the following disclaimer as
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.\" the first lines of this file unmodified other than the possible
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.\" addition of one or more copyright notices.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice(s), this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
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.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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.\" DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
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.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
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.\" DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd January 22, 2008
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.Dt BUF_ISLOCKED 9
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.Os
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.Sh NAME
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.Nm BUF_ISLOCKED
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.Nd "returns the state of the lock linked to the buffer"
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/systm.h
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.In sys/uio.h
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.In sys/bio.h
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.In sys/buf.h
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.Ft int
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.Fn BUF_ISLOCKED "struct buf *bp"
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.Sh DESCRIPTION
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The
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.Fn BUF_ISLOCKED
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function returns the status of the lock linked to the buffer in relation to
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curthread.
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.Pp
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It can return:
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.Bl -tag -width ".Dv LK_EXCLUSIVE"
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.It Dv LK_EXCLUSIVE
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An exclusive lock is held by curthread.
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.It Dv LK_EXCLOTHER
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An exclusive lock is held by someone other than curthread.
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.It Dv LK_SHARED
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A shared lock is held.
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.It Li 0
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The lock is not held by anyone.
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.El
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.Sh SEE ALSO
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.Xr buf 9 ,
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.Xr BUF_LOCK 9 ,
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.Xr BUF_UNLOCK 9 ,
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.Xr lockmgr 9 ,
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.Xr lockstatus 9
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.Sh AUTHORS
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This manual page was written by
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.An Attilio Rao Aq Mt attilio@FreeBSD.org .
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