thread class needs join() with timeout

[nobody]

I think Boost's thread class could be well served if there was a member function thread::join(double 
timeout) in addition to the join() that blocks forever.  Most other thread classes I have used have 
implemented this very useful feature.  In many respects it is not that different from the try_lock 
idiom Boost already employs for its mutexes.

[bill_kempf]

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This was considered during design and was rejected.  See 
the list archives for rationale.  To start further 
discussion please post to the list.