status.i4.v = dio_delete_requests_c(request_type.i4.v)

	Remove specified data acquisition requests from DIO's cache.  This
	will also cancel those requests with the Data Pool Manager.
	request_type	type of requests to remove
			(DIO_SET_REQUEST -> all setting requests,
			 DIO_READ_REQUEST -> all reading requests,
			 DIO_ALL_REQUEST -> all requests)

	This function returns ACNET status values as follows:

	OK			success
	DIO_BADARG		invalid request type passed
	DIO_UNAVAIL		not valid in this context (MIO in use)

	This function requires the following include files:

	diolib_h, acnet_errors_h

	Related functions:

	dio_cancel_device_reading_c, dio_cancel_array_device_reading_c,
	dio_cancel_device_reading_list, dio_can_get(_c), dio_can_set(_c),
	dio_can_get_lst, dio_can_set_lst, dio_delete_cache, dio_bld_get(_c),
	dio_bld_get_raw(_c), dio_get_dev(_c), dio_get_raw(_c)

	C/C++ usage:

	int	status;
	int	request_type = DIO_ALL_REQUEST;

	status = dio_delete_requests_c(request_type);