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Re:Chez Scheme is now free by jopython on Tuesday April 26, 2016 @07:17PM (#11576555)
Out of the four you mentioned, only Chez has true posix threads.
Re:Chez Scheme is now free by justinethier on Wednesday April 27, 2016 @10:13AM (#11580579)
Bigloo has support for posix threads. The only one on the list that absolutely does not have them is Chicken.