On 27 Sep 2013, at 11:44pm, Roman Fleysher <roman.fleys...@einstein.yu.edu> 
wrote:

> What about doing this via NFS? I presume no guarantee?

NFS has very bad locking indeed.

Frankly, if you're using SQLite as a mutex base you'd do better using the 
presence or absence of a file instead.  To signal that your database is locked, 
create a file.  If, when you create the file, you get an error message, some 
other process/thread has the database locked.

Simon.
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