This seems to be a known (but not fixed) bug that occurs on some versions of windows (or at least, it's known to break on XP but apparently not on windows 2000/2003).

As far as I can see from that bug report, there's no fix at the moment.

"What should it profit a man, if he should win a flame war, yet lose his cool?"

In reply to Re^5: baton passing threads and cond_signal by Joost
in thread baton passing threads and cond_signal by Anonymous Monk

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