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402a4353f7
Some reviewers disliked that to build a custom sched_algorithm subclass, you must necessarily manipulate pointers to classes in the boost::fibers::detail namespace. Redefine all such methods to use fiber_base* rather than detail::worker_fiber*. Hoist fiber_base* into boost::fibers namespace. We considered an opaque typedef rather than fiber_base*, but in fact a sched_algorithm subclass may need is_ready(). Moreover, a sched_algorithm subclass may well want to use an intrusive linked list to queue fibers. Hoist worker_fiber::nxt_ pointer into fiber_base, and remove worker_fiber::next() and next_reset() methods. This allows recasting detail::fifo in terms of fiber_base*, therefore round_robin can be stated almost entirely in terms of fiber_base* rather than worker_fiber*. Recast fiber constructor taking worker_fiber* to take fiber_base* instead. This constructor is used solely for fiber migration; with relevant functions now returning fiber_base*, we think we no longer need fiber(worker_fiber*).