getpid() or something similar

[Markus.Schnell@infineon.com]

You can't guarantee that another process didn't happen to
write a file with just that name, pid or not.

Markus

> -----Original Message-----
> From: Peter Simons [mailto:simons@cryp.to]
> Sent: Thursday, May 22, 2003 12:06 PM
> To: haskell-cafe@haskell.org
> Subject: Re: getpid() or something similar
> 
> 
> Simon Marlow writes:
> 
>  > Even using a ProcessID doesn't guarnatee uniqueness [...]
> 
> Why not? If I use the file only temporarily (it is gone once the
> process terminates), something like /tmp/foo.<pid> will be unique, for
> all I can tell. 
> 
> 
>  > The right way to do this is to try to open it for writing, and try
>  > a different name if the open fails.
> 
> Unfortunately, this approach features a race condition because POSIX
> has no notion of mandatory file locking. I'd really rather avoid this,
> if I can.
> 
> Is there no other way? And one that works across different compilers?
> 
> Peter
> 
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