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replaced atomic operation emulation with new code. The previous code
seemed to have some issue and also limited concurrency severely. The
whole atomic operation emulation has been rewritten.
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... as it was not even optimal on uniprocessors any longer ;) I keep
the config directive in, maybe we can utilize it again at some later
point in time (questionable).
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...to enable users to turn off pthread_yield calls which are
counter-productive on multiprocessor machines (but have been
shown to be useful on uniprocessors)
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- changed sequence when awakening thread
- removed no longer needed condition variable
- EXPERIMENTALLY added mutex guarding to hostname lookups
this is to be removed if it does not have any verifyable
useful effect
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