If there is an error condition, the following occurs:

    o  The routine returns an integer value indicating the type of
       error.

    o  The condition variable is not initialized.

    o  The contents of condition variable cond are undefined.

    The possible return values are as follows:

    Return      Description

    0           Successful completion.
    [EAGAIN]    The system lacks the necessary resources to
                initialize another condition variable, or

                The system-imposed limit on the total number of
                condition variables under execution by a single user
                is exceeded.
    [EBUSY]     The implementation has detected an attempt to
                reinitialize the object referenced by cond, a
                previously initialized, but not yet destroyed
                condition variable.
    [EINVAL]    The value specified by cond is not a valid condition
                variable.
    [ENOMEM]    Insufficient memory to initialize the condition
                variable.