> I've been doing some thinking, and I've halfway convinced myself of > the following statement: that threads as implemented by Python (or > Java) are exactly equivalent to one-shot continuations in Scheme. Am > I right?
No. In case of threads, progress can be made in an overlapping (concurrent), in case of Java even parallel fashion. In particular, if a thread blocks in a blocking operating system call (e.g. a network receive operation), other threads can continue. I believe this is not possible with continuations in Scheme. In more detail, threads as provided by the operating system underly a system scheduler: they can be preempted, they have priorities, and they may voluntarily block. All this is not possible with continuations. IOW, threads are more expressive than continuations. Regards, Martin -- http://mail.python.org/mailman/listinfo/python-list
