mav 4af4a9dc68 Add basic and not very reliable protection against going to sleep with
thread scheduled by interrupt fired after we entered critical section.
None of cpu_sleep() implementations on ARM check sched_runnable() now, so
put the first line of defence here.  This mostly fixes unexpectedly long
sleeps in synthetic tests of calloutng code and probably other situations.
2013-02-23 18:32:42 +00:00
..
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