Fri, 12 Jul 2013 12:18:17 +0200 wenzelm clarified memo_exec: plain synchronized access without any special tricks;
Fri, 12 Jul 2013 12:17:03 +0200 wenzelm tuned;
Fri, 12 Jul 2013 12:04:16 +0200 wenzelm clarified execution: maintain running execs only, check "stable" separately via memo (again);
Fri, 12 Jul 2013 11:28:03 +0200 wenzelm tuned signature;
Fri, 12 Jul 2013 11:07:02 +0200 wenzelm clarified module name;
Thu, 11 Jul 2013 23:24:40 +0200 wenzelm more explicit type Exec.context;
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