GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  VOP_ISLOCKED (9)

NAME

VOP_LOCK, VOP_UNLOCK, VOP_ISLOCKED, vn_lock - serialize access to a vnode

CONTENTS

Synopsis
Description
Return Values
See Also
Authors

SYNOPSIS


.In sys/param.h
.In sys/lock.h
.In sys/vnode.h int VOP_LOCK struct vnode *vp int flags int VOP_UNLOCK struct vnode *vp int flags int VOP_ISLOCKED struct vnode *vp int vn_lock struct vnode *vp int flags

DESCRIPTION

These calls are used to serialize access to the file system, such as to prevent two writes to the same file from happening at the same time.

The arguments are:
vp The vnode being locked or unlocked.
flags One of the lock request types:

LK_SHARED Shared lock.
LK_EXCLUSIVE Exclusive lock.
LK_UPGRADE Shared-to-exclusive upgrade.
LK_DOWNGRADE Exclusive-to-shared downgrade.
LK_RELEASE Release any type of lock.
LK_DRAIN Wait for all lock activity to end.

The lock type may be or ’ed with these lock flags:

LK_NOWAIT Do not sleep to wait for lock.
LK_SLEEPFAIL Sleep, then return failure.
LK_CANRECURSE
  Allow recursive exclusive lock.
LK_NOWITNESS Instruct witness(4) to ignore this instance.

The lock type may be or ’ed with these control flags:

LK_INTERLOCK Specify when the caller already has a simple lock ( VOP_LOCK will unlock the simple lock after getting the lock).
LK_RETRY Retry until locked.

Kernel code should use vn_lock to lock a vnode rather than calling VOP_LOCK directly. vn_lock also does not want a thread specified as argument but it assumes curthread to be used.

RETURN VALUES

Zero is returned on success, otherwise an error is returned.

SEE ALSO

vnode(9)

AUTHORS

This manual page was written by
.An Doug Rabson .
Search for    or go to Top of page |  Section 9 |  Main Index


Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.