As ikegami alludes to in a later post, SQLite has some issues with concurrency. There is no 'row-locking', or even 'table-locking'. Any thread that begins a write locks out all others until it is done. This would be the same in multi-thread vs multi-process.

In reply to Re^3: Thread local variables in Thread::Pool::Simple by Illuminatus
in thread Thread local variables in Thread::Pool::Simple by Annirak

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