This routine initializes a condition variable (cond) with the
    Threads Library default condition variable attributes.

    A condition variable is a synchronization object used with a
    mutex. A mutex controls access to shared data. When threads are
    present, a condition variable allows threads to wait for data to
    enter a defined state.

    For more information about actions taken when threads are
    present, refer to the pthread_cond_init() description.

    Your program can use the macro PTHREAD_COND_INITIALIZER to
    initialize statically allocated condition variables to the
    default condition variable attributes. Static initialization
    can be used only for a condition variable with storage class
    "extern" or "static" - "automatic" (stack local) objects must
    be initialized by calling tis_cond_init(). Use this macro as
    follows:

       pthread_cond_t condition = PTHREAD_COND_INITIALIZER;

    When statically initialized, a condition variable should not also
    be initialized using tis_cond_init().