* nicer flags
* fix concurrency
* add concurrent workers
* initialize things
* fix tests
* close retain service
* ensure we don't have workers working on the same satellite
* ensure things compile
* fix other compilation issues:
* concurrency changes
ran this with `go test -count=1000` and it passed all of them.
- we add a closed channel so that we can select on it with
context cancellation.
- we put a once in so we only close the channel once.
- every time the queue/running state changes, we have to broadcast
because we may want to wake up N pending Wait calls or other
concurrent workers.
- because we broadcast, we don't need to do the polling in Wait
anymore.
- ensure Run doesn't start multiple times so that we don't have
to worry about concurrent Close with multiple Runs.
- hold the lock while we start workers so that a concurrent Close
with Run can't decide that there's nothing started and exit
and then have Run start things.
- make sure to poll the closed/context channels through loops
or at the start of Run calls in case Close happens first.
- these polls should be under a mutex because they have a default
case which makes it possible to schedule such that Close hasn't
executed the channel close so it starts more work.
- cancel a local Run context when it's going to exit to make sure
that any retainPieces calls have a canceled context.
- hopefully enough comments to both check my work and help readers
digest what's going on.
Change-Id: Ida0e226a7e01e8ae64fa2c59dd5a84b04bccfbd7
* use the retain error class
Change-Id: I1511eaef135f98afd57b878e997e4c8a0d11cafc
* concurrency fixes again
- forgot to update the gc test to use the old Wait api.
- we need to drop the lock while we wait for the workers
to exit, because they may be blocked on the condition
variable
- additionally, we need to broadcast when we close the
signal channel because the state changed: they want
to wake up and exit.
Change-Id: I4204699792275260cd912f29aa73720f7d9b14b5
* undo my misguided rename
Change-Id: I6baffe1eb0434e260212c485bbcc01bed3250881
* remove pollInterval
* format paragraph more nicely
* move skew calculation into retain pieces
62e3bf5b34