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VOP_ISLOCKED.9freebsd
Langue: en
Version: 365473 (ubuntu - 25/10/10)
Section: 9 (Appels noyau Linux)
BSD mandoc
NAME
VOP_LOCK VOP_UNLOCK VOP_ISLOCKED vn_lock - serialize access to a vnodeSYNOPSIS
In sys/param.h In sys/lock.h In sys/vnode.h Ft int Fn VOP_LOCK struct vnode *vp int flags Ft int Fn VOP_UNLOCK struct vnode *vp int flags Ft int Fn VOP_ISLOCKED struct vnode *vp Ft int Fn vn_lock struct vnode *vp int flagsDESCRIPTION
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:
- Fa vp
- The vnode being locked or unlocked.
- Fa 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 Fn ( VOP_LOCK will unlock the simple lock after getting the lock).
- LK_RETRY
- Retry until locked.
Kernel code should use Fn vn_lock to lock a vnode rather than calling Fn VOP_LOCK directly. Fn 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 .Contenus ©2006-2024 Benjamin Poulain
Design ©2006-2024 Maxime Vantorre