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+.\"
+.\" Copyright (c) 2003 Bruce M Simpson <bms@spc.org>
+.\" 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, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, 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 AUTHOR AND CONTRIBUTORS ``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 AUTHOR OR CONTRIBUTORS 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.
+.\"
+.Dd July 19, 2003
+.Dt VM_MAP_LOCK 9
+.Os
+.Sh NAME
+.Nm vm_map_lock ,
+.Nm vm_map_unlock ,
+.Nm vm_map_lock_read ,
+.Nm vm_map_unlock_read ,
+.Nm vm_map_trylock ,
+.Nm vm_map_trylock_read ,
+.Nm vm_map_lock_upgrade ,
+.Nm vm_map_lock_downgrade
+.Nd vm_map locking macros
+.Sh SYNOPSIS
+.In sys/param.h
+.In vm/vm.h
+.In vm/vm_map.h
+.Ft void
+.Fn vm_map_lock "vm_map_t map"
+.Ft void
+.Fn vm_map_unlock "vm_map_t map"
+.Ft void
+.Fn vm_map_lock_read "vm_map_t map"
+.Ft void
+.Fn vm_map_unlock_read "vm_map_t map"
+.Ft int
+.Fn vm_map_trylock "vm_map_t map"
+.Ft int
+.Fn vm_map_trylock_read "vm_map_t map"
+.Ft int
+.Fn vm_map_lock_upgrade "vm_map_t map"
+.Ft int
+.Fn vm_map_lock_downgrade "vm_map_t map"
+.Sh DESCRIPTION
+The
+.Fn vm_map_lock
+macro obtains an exclusive lock on
+.Fa map .
+.Pp
+The
+.Fn vm_map_unlock
+macro releases an exclusive lock on
+.Fa map .
+.Pp
+The
+.Fn vm_map_lock_read
+macro obtains a read-lock on
+.Fa map .
+.Pp
+The
+.Fn vm_map_unlock_read
+macro releases a read-lock on
+.Fa map .
+.Pp
+The
+.Fn vm_map_trylock
+macro attempts to obtain an exclusive lock on
+.Fa map .
+It returns FALSE if the lock cannot be immediately acquired;
+otherwise return TRUE with the lock acquired.
+.Pp
+The
+.Fn vm_map_trylock_read
+macro attempts to obtain a read-lock on
+.Fa map .
+It returns FALSE if the lock cannot be immediately acquired;
+otherwise return TRUE with the lock acquired.
+.Pp
+The
+.Fn vm_map_lock_upgrade
+macro attempts to atomically upgrade a read-lock on
+.Fa map
+to an exclusive lock.
+.Pp
+The
+.Fn vm_map_lock_downgrade
+macro attempts to downgrade an exclusive lock on
+.Fa map
+to a read-lock.
+.Sh IMPLEMENTATION NOTES
+Currently, all of the locking macros implement their locks as sleep locks.
+.Sh SEE ALSO
+.Xr vm_map 9
+.Sh AUTHORS
+This manual page was written by
+.An Bruce M Simpson Aq Mt bms@spc.org .