From: "Berger, Daniel" <djberge@...>
Date: 2003-01-14T08:31:31+09:00
Subject: Re: is flock broken on solaris?

> -----Original Message-----
> From: Joel VanderWerf [mailto:vjoel@PATH.Berkeley.EDU] 
> Joel VanderWerf wrote:
> >             File.read($path)
> 
> I should have pointed out that the File.read call (within the lock 
> context) is necessary to the problem. I wonder if that gives up the 
> lock? Because doing the following immediately after the read seems to 
> fix the problem:
> 
>              f.flock(File::LOCK_EX)
> 
> So this suggests that file locks are nestable on linux but not on 
> solaris. The man pages say that solaris flock is implemented 
> in terms of 
> fcntl, so maybe that's where the semantic difference comes from...
> 
> I wonder if there is a way ruby can insulate us from this difference?

I might be totally off here, but are you using NFS by any chance?  According
to some posts I've read on comp.unix.solaris, flock is just plain busted on
NFS.

Regards,

Dan