Wed, 23 Apr 2014 13:05:11 +0200 wenzelm detect nested interrupts;
Wed, 23 Apr 2014 12:55:57 +0200 wenzelm clarified message and return code, in accordance to ML version;
Wed, 23 Apr 2014 12:51:55 +0200 wenzelm interruptible dependencies, which can take a few seconds;
Wed, 23 Apr 2014 12:39:23 +0200 wenzelm more abstract Exn.Interrupt and POSIX return code;
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