Fri, 19 Aug 2011 16:13:26 +0200 wenzelm tuned signature -- treat structure Task_Queue as private to implementation;
Fri, 19 Aug 2011 15:56:26 +0200 wenzelm refined Future.cancel: explicit future allows to join actual cancellation;
Fri, 19 Aug 2011 14:01:20 +0200 wenzelm Future.promise: explicit abort operation (like uninterruptible future job);
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