RXQUEUE
RXQUEUE
Receive/Transmit Queue Information.
Type
USHORT cch USHORT cb
C Declaration Method
typedef struct
Fields
cch Number of characters in the queue.
Binary integer with the number of characters received/to be transmitted in
the physical device driver receive/transmit queue. This is a memory buffer
between the memory pointed to by the READ/WRITE request packet and the
receive/transmit hardware for this COM device.
cb Size of receive/transmit queue.
Binary integer with the size of the physical device driver
receive/transmit queue. Applications should be independent of the
receive/transmit queue size (fixed or not fixed). The information in this
field allows the application to get the size of the receive/transmit
queue, but is subject to change. The current size of the receive queue is
approximately 1KB.
Using this information, the application should avoid device driver receive
queue overruns by using an application-to-application block protocol with
the system communicating with the application.
Comment
The behavior of data movement between the READ/WRITE request and the receive/transmit queue can change with each release of the physical device driver. Applications should not be dependent on this information.