The function make-barrier returns a new barrier with count count.
count can be t, which is interpreted as most-positive-fixnum.
barrier has the name name, which is useful for debugging but is not used otherwise. If name is omitted, then a default name is generated that is unique among all such default names.
discount-on-timeout and discount-on-abort determine the default behavior when a thread times out or aborts while in the function barrier-wait. See the documentation for barrier-wait.
If disable-on-unblock is true, then barrier-wait will disable barrier by default when it unblocks it. See disable-on-unblock in the documentation for barrier-wait.
callback is called by barrier-wait just before it unblocks barrier. It is called with a single argument, barrier, while holding an internal lock in barrier that will prevent other operations on barrier from running. The callback is guaranteed to happen before barrier-wait allows any of the other threads to continue.
NotesBecause the callback is called inside a lock, you should ensure that it is relatively short to prevent congestion if another thread tries to access barrier. Allocating a few objects is reasonable. If there is a more expensive operation that has to be done by only one of the threads, it can be done by the thread that returned :unblocked from barrier-wait. The advantage of using the callback is that it is called before any of the waiting threads pass the barrier.
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