The Read a Barrier routine returns the specified barrier's
    current quorum and the number of participants currently waiting
    (blocked) at the barrier. The barrier must have been created by
    PPL$CREATE_BARRIER.

    Format

      PPL$READ_BARRIER  barrier-id ,quorum ,waiters

1  –  Arguments

 barrier-id

    OpenVMS usage identifier
    type          longword (unsigned)
    access        read only
    mechanism     by reference
    Identifier of the specified event. The barrier-id argument is the
    address of an unsigned longword containing the identifier.

    Barrier-id is returned by PPL$CREATE_BARRIER.

 quorum

    OpenVMS usage word_signed
    type          word (signed)
    access        write only
    mechanism     by reference
    Number of participants required to terminate a wait for this
    barrier. The quorum argument is the address of a signed word
    containing the quorum value. This argument returns the current
    quorum value that you set with PPL$CREATE_BARRIER, PPL$SET_
    QUORUM, or PPL$ADJUST_QUORUM.

 waiters

    OpenVMS usage word_signed
    type          word (signed)
    access        write only
    mechanism     by reference
    Number of participants currently waiting at this barrier. The
    waiters argument is the address of a signed word containing the
    number of waiting participants.