file locking...

[Gabriel Genellina]

En Sun, 01 Mar 2009 16:11:41 -0200, Nigel Rantor <wiggly at wiggly.org>  
escribió:
> bruce wrote:

>> i can easily setup a file read/write lock process where a client app
>> gets/locks a file, and then copies/moves the required files from the  
>> initial
>> dir to a tmp dir. after the move/copy, the lock is released, and the  
>> client
>> can go ahead and do whatever with the files in the tmp dir.. thie  
>> process
>> allows multiple clients to operate in a psuedo parallel manner...

> I'm really not sure why you want to move the files around. Here are two  
> different approaches from the one I initially gave you that deals  
> perfectly well with a directory where files are constantly being added.

This is a third approach - simpler than Bruce's.
Each process chooses any file and tries to rename/move it onto a different  
directory. Rename is an atomic operation (at least on POSIX) so no locks  
are required. If the rename fails, choose another file and try again.

-- 
Gabriel Genellina