s/shold/should/

Fix a silly bug the "cancel thrash" test: the exit condition for the
job was never set, and so if the job actually got started before the
cancellation request came in, it would never finish and the c

Fix a silly bug the "cancel thrash" test: the exit condition for the
job was never set, and so if the job actually got started before the
cancellation request came in, it would never finish and the cancellation
request would just hang forever.

Should address a spurious automated test failure reported by kre@.

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Add a test case that exercises repeated sceduling and cancelling of a job,
with periodic dropping of the interlock.

- De-opaque'ify struct threadpool_job.
- De-_t'ify all of the structure types.

No functional chage, no ABI change (verified with old rump unit test
before and after new librump.so).

Per Taylor's re

- De-opaque'ify struct threadpool_job.
- De-_t'ify all of the structure types.

No functional chage, no ABI change (verified with old rump unit test
before and after new librump.so).

Per Taylor's request.

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Include some non-critical-but-still-for-correctness lines of code
in the cancellation unit test. (I could have sworn I actually typed
these lines, no really...)

Add rump-based test cases for threadpool(9).