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author | bms <bms@FreeBSD.org> | 2003-09-30 00:51:31 +0000 |
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committer | bms <bms@FreeBSD.org> | 2003-09-30 00:51:31 +0000 |
commit | 2e8e8cca73ba5c5237000da3729c627bda50a12c (patch) | |
tree | 98bbca99e2597751865cbedb2cd92ac951eb3877 /share/man/man9/vm_map_lock.9 | |
parent | 0a6c1d4242d4d23328bf77b152fe0864e2db7f35 (diff) | |
download | FreeBSD-src-2e8e8cca73ba5c5237000da3729c627bda50a12c.zip FreeBSD-src-2e8e8cca73ba5c5237000da3729c627bda50a12c.tar.gz |
Add manual pages for the vm_map(9) part of the VM.
Reviewed by: juli
Approved by: jake (mentor)
Diffstat (limited to 'share/man/man9/vm_map_lock.9')
-rw-r--r-- | share/man/man9/vm_map_lock.9 | 118 |
1 files changed, 118 insertions, 0 deletions
diff --git a/share/man/man9/vm_map_lock.9 b/share/man/man9/vm_map_lock.9 new file mode 100644 index 0000000..1027b70 --- /dev/null +++ b/share/man/man9/vm_map_lock.9 @@ -0,0 +1,118 @@ +.\" +.\" 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. +.\" +.\" $FreeBSD$ +.\" +.Dd July 19, 2003 +.Dt vm_map_lock 9 +.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 . +Currently this is implemented as an exclusive lock. +.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. +Currently this is implemented as an exclusive lock. +.Pp +The +.Fn vm_map_lock_upgrade +macro attempts to atomically upgrade a read-lock on +.Fa map +to an exclusive lock. +As read-locks are currently implemented as exclusive locks, +this macro is a no-op. +.Pp +The +.Fn vm_map_lock_downgrade +macro attempts to downgrade an exclusive lock on +.Fa map +to a read-lock. +As read-locks are currently implemented as exclusive locks, +this macro is a no-op. +.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 man page was written by +.An Bruce M Simpson Aq bms@spc.org . |