On 13 Apr 2010, at 5:19am, Max Vlasov wrote:

> On Tue, Apr 13, 2010 at 3:46 AM, Simon Slavin <slav...@bigfraud.org> wrote:
> 
>> 
>> Does SQLite actually use byte-range locking ?  I thought it always locked
>> the entire file.
>> 
>> 
> Simon, I think it's about the way sqlite implements different locks, a quote
> from os.h
> 
> ** A SHARED_LOCK is obtained by locking a single randomly-chosen
> ** byte out of a specific range of bytes. ...

Oh, I see.  That's called semaphore locking.  I never realised SQLite used it.  
Thanks for the info.

Simon.
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