locking/concurrency control

Hi,

what exactly is the locking /concurrency control mechanism used in
NFS to prevent simultaneous updates in NFS ?

On Aug 11, 3:24*am, aark...@gmail.com wrote:
[color=blue]
> Hi,
>
> *what exactly is the locking /concurrency control mechanism used in
> NFS to prevent simultaneous *updates in NFS ?[/color]

There is no need. If the updates are simultaneous, then neither is
"more recent" than the other. So it doesn't matter. It only matters if
a less recent update overwrites a more recent update.

DS

[email]aarklon@gmail.com[/email] writes:
[color=blue]
> Hi,
>
> what exactly is the locking /concurrency control mechanism used in
> NFS to prevent simultaneous updates in NFS ?[/color]

Some systems have/had a lock daemon running, and the NFS
implementations coordinated with them to ensure concurrency.