Github user afs commented on the issue:
https://github.com/apache/jena/pull/153
Semaphore hand out permits so 0 means no permit.
There is a `semaStart.release()` in `run()` and the corresponding `acquire`
in the lambda in `create` which has comments. Renaming the local `semaStart`
would help.
The `AtomicReference` can be combined in `AtomicReference<Throwable>`.
`ThreadTxn` came about for testing purposes - `Txn` is the main
contribution.
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