Fri, 25 Apr 2014 22:10:03 +0200 wenzelm just one default thread pool (which is hardwired to Runtime.availableProcessors);
Fri, 25 Apr 2014 21:31:39 +0200 wenzelm tuned signature -- separate pool for JFuture tasks, which can be canceled;
Fri, 25 Apr 2014 20:21:27 +0200 wenzelm prefer Isabelle/Scala operations;
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