If an error condition occurs, this routine returns an integer value indicating the type of error. Possible return values are as follows: Return Description 0 Successful completion. [EBUSY] The object being referenced by cond is being referenced by another thread that is currently executing a tis_cond_wait() on the condition variable specified in cond. (This error can only occur when threads are present.) [EINVAL] The value specified by cond is not a valid condition variable.