module Netsys_pollset_posix:Pollsets for POSIX operating systems
val poll_based_pollset :
unit -> Netsys_pollset.pollset
Win32: On Win32 this implementation works, but only for sockets,
and is not cancellable in multi-threaded programs. (This is a
restriction because we have to map it to the
select call of the
forkto free these descriptors.