nq_ctx

An enqueue context created by mtaEnqueueStart().

message

Optional address of a pointer to receive the address of the NULL terminated error message text. A NULL value may be supplied for this argument. 

message_len

Optional address of a size_t to receive the length in bytes of the error message text. A NULL value may be supplied for this argument.

item_code

Reserved for future use. A value of zero must be supplied for this call argument.