pthread_cond_wait does not relock mutex on release

[Michael Labhard]

Robert and Gerald:

         Both quite right.  Although adding the SAFE_PRINTF made no 
difference in the 
output, checking a condition value in a loop made all the difference. Â 
Putting a printf in the loop revealed to my surprise that "spurious wakeups" 
were occurring thousands of times per second. Â I had naively assumed that a 
condition would stay set until signalled. Â Now I'm led to wonder if a 
condition variable is any performance improvement over a simple loop and 
short sleep. Â Any thoughts?

         Thanks very much for your time and effort.  It was a great help.

-- Michael


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