Remove cancelled work from the threadpool queue #1375
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This addresses #372.
Note that the solution is much simpler than discussed in #372. Since we control the object handed back to the caller (
Future/Observable), we can straightforwardly add the queue removal operation to the unsubscription.As in the
ScheduledThreadPoolExecutor.removeOnCancelPolicysolution that JDK7 uses, this only applies to work sitting in the queue. Work already in the pool is handled directly by the JDK.