[Info-vax] CRTL and RMS vs SSIO

[Lawrence D’Oliveiro]

On Sunday, October 10, 2021 at 1:44:55 PM UTC+13, Stephen Hoffman wrote:
> Various apps can use range locks or local locking or other 
> synchronization for that, but Linux does offer integrated lock 
> management support. 

Nothing VMS-style. All I can find is this <https://manpages.debian.org/bullseye/manpages-dev/fcntl.2.en.html>, which describes about 3 different styles of locking, all on byte ranges, and all associated with files.

> I don't recall which Linux version first saw lock manager integration, 
> but it was a while back. In RHEL clusters running GFS2 for instance, 
> that DLM is a fundamental part of file access. 

Might be a Red-Hat-specific feature, then.

> For many developers, the database and the database developers deal with 
> this coordination, and not the app developer.

Precisely. And with a proper database, you can use transactions as a way to avoid locking in many cases.