Ocfs2 users - May 2007 - php flock function and ocfs2?

Hi all,

does anybody have experiences with php flock funktion and ocfs2 clusters? flock
is described in http://php.net/flock . The following text is outlined by the
developers:

-------- snip --------
flock() will not work on NFS and many other networked file systems. Check your
operating system documentation for more details.

On some operating systems flock() is implemented at the process level. When
using a multithreaded server API like ISAPI you may not be able to rely on
flock() to protect files against other PHP scripts running in parallel threads
of the same server instance!
-------- snip --------

OS is CentOS 4.4, latest kernel (2.6.9-42.0.10ELsmp) and latest rpm package from
ocfs2.

Could it be that there are interactions between the two locking mechanism of php
and ocfs2?

Stephan

in the cluster docu I found:

Caveats
======Features which OCFS2 does not support yet:
        - extended attributes
        - readonly mount
        - shared writeable mmap
        - loopback is supported, but data written will not
          be cluster coherent.
        - quotas
        - cluster aware flock   <----------------------------------------
        - Directory change notification (F_NOTIFY)
        - Distributed Caching (F_SETLEASE/F_GETLEASE/break_lease)
        - POSIX ACLs
        - readpages / writepages (not user visible)

Could this be the reason and when yes will it be implemented in the near future?

Stephan
>>> "Stephan Hendl" <Stephan.Hendl@lds.brandenburg.de>
schrieb am 21.05.2007 um
15:30 in Nachricht
<4651BB2A.4F9C.0016.0@lds.brandenburg.de>:
> Hi all,
> 
> does anybody have experiences with php flock funktion and ocfs2 clusters? 
> flock is described in http://php.net/flock . The following text is outlined
> by the developers:
> 
> -------- snip --------
> flock() will not work on NFS and many other networked file systems. Check 
> your operating system documentation for more details.
> 
> On some operating systems flock() is implemented at the process level. When
> using a multithreaded server API like ISAPI you may not be able to rely on 
> flock() to protect files against other PHP scripts running in parallel 
> threads of the same server instance! 
> -------- snip --------
> 
> OS is CentOS 4.4, latest kernel (2.6.9-42.0.10ELsmp) and latest rpm package
> from ocfs2.
> 
> Could it be that there are interactions between the two locking mechanism
of
> php and ocfs2?
> 
> Stephan
> 
> 
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