Janne Hellsten wrote:
> Hello,
> 
> I need to sequentialize two processes accessing the same GDBM database 
> (OCaml's dbm library).  Since GDBM allows for only one writer at a time, 
> I need a way to block until the previous writer has finished.  I think 
> there is a way to do this with the original GDBM library since it claims 
> to handle the file lockings properly -- I could block based on the 
> returned error codes.  However, this functionality does not appear to be 
> exposed through the Dbm module.
> 
> Of course I can implement this blocking myself with an interprocess 
> mutex.  But how can I implement such a mutex in OCaml?  I couldn't find 
> anything from the standard library that would resemble my problem.

Unix.lockf is the way to go.

Alex

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