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poll poll-items timeout/blockprocedure

Poll the poll-item list poll-items for activity. timeout/block can either be #t which will block until one of the poll-items is ready. When #f is passed the call will not block and return #f when no poll-item is ready. Alternatively, an integer may be passed, indicating the number of microseconds to wait for activity.

The return value is a number indicating how many poll-items are ready.