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-.\"
-.\" Copyright (C) 2001 Chad David <davidc@acns.ab.ca>. All rights reserved.
-.\"
-.\" Redistribution and use in source and binary forms, with or without
-.\" modification, are permitted provided that the following conditions
-.\" are met:
-.\" 1. Redistributions of source code must retain the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer as
-.\"    the first lines of this file unmodified other than the possible
-.\"    addition of one or more copyright notices.
-.\" 2. Redistributions in binary form must reproduce the above copyright
-.\"    notice(s), this list of conditions and the following disclaimer in the
-.\"    documentation and/or other materials provided with the distribution.
-.\"
-.\" THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER(S) ``AS IS'' AND ANY
-.\" EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
-.\" WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
-.\" DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
-.\" DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
-.\" (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
-.\" SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
-.\" CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
-.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
-.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
-.\" DAMAGE.
-.\"
-.\" $FreeBSD$
-.\"
-.Dd July 17, 2001
-.Dt VM_PAGE_IO_START 9
-.Os
-.Sh NAME
-.Nm vm_page_io_start ,
-.Nm vm_page_io_finish
-.Nd "ready or unready a page for I/O"
-.Sh SYNOPSIS
-.In sys/param.h
-.In vm/vm.h
-.In vm/vm_page.h
-.Ft void
-.Fn vm_page_io_start "vm_page_t m"
-.Ft void
-.Fn vm_page_io_finish "vm_page_t m"
-.Sh DESCRIPTION
-The
-.Fn vm_page_io_start
-function prepares the page for I/O by incrementing its busy flag by one.
-.Pp
-The
-.Fn vm_page_io_finish
-function lowers the busy count on the page by one, if the resulting busy
-count is zero, a
-.Xr wakeup 9
-will be issued if the page has been marked
-.Dv VPO_WANTED .
-A page is typically marked
-.Dv VPO_WANTED
-by a thread to register its interest in
-the page to either complete I/O or becoming available for general use.
-.Sh AUTHORS
-.An -nosplit
-This manual page was written by
-.An Chad David Aq davidc@acns.ab.ca
-and
-.An Alfred Perlstein Aq alfred@FreeBSD.org .