The Insert Entry at Head of Queue routine inserts a queue entry
    at the head of the specified self-relative longword interlocked
    queue. LIB$INSQHI makes the INSQHI instruction available as a
    callable routine.

    Format

      LIB$INSQHI  entry ,header [,retry-count]

1  –  Returns

    OpenVMS usage:cond_value
    type:         longword (unsigned)
    access:       write only
    mechanism:    by value

2  –  Arguments

 entry

    OpenVMS usage:unspecified
    type:         unspecified
    access:       modify
    mechanism:    by reference, array reference

    Entry to be inserted by LIB$INSQHI. The entry argument contains
    the address of this signed quadword-aligned array that must be at
    least 8 bytes long. Bytes following the first 8 bytes can be used
    for any purpose by the calling program.

    For Alpha and I64 systems, the entry argument must contain a 32-
    bit sign-extended address. An illegal operand exception occurs
    for any other form of address.

 header

    OpenVMS usage:quadword_signed
    type:         quadword integer (signed)
    access:       modify
    mechanism:    by reference

    Queue header specifying the queue into which entry is to be
    inserted. The header argument contains the address of this signed
    aligned quadword integer. The header argument must be initialized
    to zero before first use of the queue; zero means an empty queue.

    For Alpha systems, the header argument must contain a 32-bit
    sign-extended address. An illegal operand exception occurs for
    any other form of address.

 retry-count

    OpenVMS usage:longword_unsigned
    type:         longword (unsigned)
    access:       read only
    mechanism:    by reference

    The number of times the insertion is to be retried in case
    of secondary-interlock failure of the queue instruction in a
    processor-shared memory application. The retry-count argument is
    the address of an unsigned longword that contains the retry count
    value. A value of 1 causes no retries. The default value is 10.