Linux and UNIX Man Pages

Linux & Unix Commands - Search Man Pages

vop_unlock(9) [osx man page]

VOP_LOCK(9)						   BSD Kernel Developer's Manual					       VOP_LOCK(9)

NAME
VOP_LOCK, VOP_UNLOCK, VOP_ISLOCKED, vn_lock -- serialize access to a vnode SYNOPSIS
#include <sys/param.h> #include <sys/lock.h> #include <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 spec- ified 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 Doug Rabson. BSD
February 25, 2008 BSD

Check Out this Related Man Page

VOP_LOCK(9)						   BSD Kernel Developer's Manual					       VOP_LOCK(9)

NAME
VOP_LOCK, VOP_UNLOCK, VOP_ISLOCKED, vn_lock -- serialize access to a vnode SYNOPSIS
#include <sys/param.h> #include <sys/lock.h> #include <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 spec- ified 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 Doug Rabson. BSD
February 25, 2008 BSD
Man Page

13 More Discussions You Might Find Interesting

1. AIX

AIX Links

Manufacturer Links General Information Home Page: IBM United States Documentation/Information: IBM System p - UNIX servers: Support and services pSeries and AIX Information Center Developerworks AIX Wiki: AIX Wiki AIX for System Administrators In-depth information from IBM: IBM... (0 Replies)
Discussion started by: Perderabo
0 Replies

2. OS X (Apple)

Mac OS X: Based on UNIX - Solid As a Rock

See this threads: Page Not Found - Apple Open Source - Apple (0 Replies)
Discussion started by: Neo
0 Replies

3. Shell Programming and Scripting

At A Glance Coloured Real Time Bargraph Generator...

Not sure if anyone is interested but I am just getting into UNIX like shell scripting... I have great interest in pseudo-animations in text mode and accessing HW like /dev/dsp for example... ... Have fun, I do... ;o) # !/bin/sh # # Bargraph_Generator.sh # # A DEMO 6 bit coloured... (0 Replies)
Discussion started by: wisecracker
0 Replies

4. UNIX for Advanced & Expert Users

When is a _function_ not a _function_?

For a starter I know the braces are NOT in the code... Consider these code snippets:- #!/bin/bash --posix x=0 somefunction() if then echo "I am here." fi # somefunction #!/bin/bash --posix x=0 somefunction() if (2 Replies)
Discussion started by: wisecracker
2 Replies

5. OS X (Apple)

Installing Dash Shell on OS X Lion

For those interested in installing dash shell on OSX Lion to help test POSIX compliancy of shell scripts, it is quite easy. I did it like this: If you don't have gcc on your system: 0. Download and install the Command Line Tools for Xcode package from Sign In - Apple * 1. Download the dash... (2 Replies)
Discussion started by: Scrutinizer
2 Replies

6. OS X (Apple)

Hearing Aid for OSX 10.12.x and greater.

Hearing Aid... Hi folks yet another bizarre piece of code that is Apple OSX 10.12.x to at least 10.14.1 specific. It requires only a default OSX install, and the internal microphone along with an external headphone assembly. Pre-amble, 14-02-2019: For over 3 weeks now I have been suffering a... (3 Replies)
Discussion started by: wisecracker
3 Replies

7. UNIX for Advanced & Expert Users

Shopt -s histappend

What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file. # When the shell exits, append to the history file instead of overwriting it shopt -s histappend (3 Replies)
Discussion started by: cokedude
3 Replies

8. OS X (Apple)

Undeletable file

Greetings, I'm trying to delete a file with a weird name from within Terminal on a Mac. It's a very old file (1992) with null characters in the name: ␀␀Word Finder® Plus™. Here are some examples of what I've tried: 12FX009:5 dpontius$ ls ␀␀Word Finder® Plus™ 12FX009:5 dpontius$ rm... (29 Replies)
Discussion started by: dpontius
29 Replies

9. Shell Programming and Scripting

To print diamond asterisk pattern based on inputs

I have to print the number of stars that increases on each line from the minimum number until it reaches the maximum number, and then decreases until it goes back to the minimum number. After printing out the lines of stars, it should also print the total number of stars printed. I have tried... (13 Replies)
Discussion started by: rohit_shinez
13 Replies

10. Programming

My first PERL incarnation... Audio Oscillograph

Hi all... Well guys and gals, I jumped in at the deep end and found things that PERL cannot do by default. Many tricky terminal escape codes are not catered for so I had to create workarounds. One thing I searched for was this: Passing perl variable to shell command AND, @Neo this was... (15 Replies)
Discussion started by: wisecracker
15 Replies

11. Shell Programming and Scripting

A dash to GOTO or a dash from GOTO, that is the question...

Well, guys I saw a question about GOTO for Python. So this gave me the inspiration to attempt a GOTO function for 'dash', (bash and ksh too). Machine: MBP OSX 10.14.3, default bash terminal, calling '#!/usr/local/bin/dash'... This is purely a fun project to see if it is possible in PURE... (3 Replies)
Discussion started by: wisecracker
3 Replies

12. Shell Programming and Scripting

Syntax error in subtraction in Bash

I am sharing a code snippet. for (( i=0; i<=$(( $count -1 )); i++ )) do first=${barr2} search=${barr1} echo $first echo "loop begins" for (( j=0; j<=5000; j++ )) do if } == $search ]]; then echo $j break; fi done second=${harr2} echo $second (2 Replies)
Discussion started by: ngabrani
2 Replies

13. Shell Programming and Scripting

Python: Refer a properties file from different location

Hi All, I'm having a python script: test.py in /path/to/script/test.py I'm using a properties file: test_properties.py (it is having values as dictionary{}) which is in same DIR as the script. Sample Properties file: params = { 'target_db' : 'a1_db' 'src_db' : ... (15 Replies)
Discussion started by: saps19
15 Replies