Making sure script only runs once instance at a time.

[Fredrik Lundh]

Paul Rubin wrote:

>> That's the same kind of principle as my posted snippet,  it doesn't
>> rely on the file's presence or absence as such.  It only cares when
>> the file exists *and* is held open by another process.    When the
>> process exits,  the lock ends without needing to clean up.
>>
>> It works on Windows, but that doesn't help the OP :)
> 
> Huh?  Fcntl is on linux.

I'm pretty sure "it" in tim's post refers to the his snippet, not yours.

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