ev/select

    cfunction
    src/core/ev.c on line 1078, column 1

    (ev/select & clauses)

    Block until the first of several channel operations occur. Returns 
    a tuple of the form [:give chan], [:take chan x], or [:close chan], 
    where a :give tuple is the result of a write and a :take tuple is 
    the result of a read. Each clause must be either a channel (for a 
    channel take operation) or a tuple [channel x] (for a channel give 
    operation). Operations are tried in order such that earlier clauses 
    take precedence over later clauses. Both give and take operations 
    can return a [:close chan] tuple, which indicates that the 
    specified channel was closed while waiting, or that the channel was 
    already closed.