On 1 Mar 2018, at 7:24am, Shevek <sql...@anarres.org> wrote:

> What I think is happening is that either a pthread mutex or a database lock 
> is serializing the accesses, so each thread blocks the others.

What journal mode are you using ?

<https://sqlite.org/pragma.html#pragma_journal_mode>

If it's not WAL, try WAL.  If it's currently WAL, try DELETE.  Once you've 
changed it see if this changes how your program behaves.

Simon.
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