I'm getting a lot of occurrences of errors like "Lock on mutex 
0x7ff000018 was held during -1 ms (threshold: 1000 ms)." I have not 
found anything in the
documentation which explains what a negative time means in this context.
Does it mean that the delay is so large that it has overflown the timer
value? If so, why do I only ever see -1 or, rarely, -2? Does it mean
that the lock actually happened after the unlock? Unlikely.

I see in unrelated documentation that "cond" calls should be avoided. I
have some of these in my code. Could they be causing this problem?

-- 
(\/)atthew )-(ambley - Software Engineer
   The 2 Pad Project, part of SKADS
   Jodrell Bank Observatory, The University of Manchester

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