MQX Software SolutionsのトピックRe: Non-blocking UDP receive problem - Error 0x1120

Non-blocking UDP receive problem - Error 0x1120

michael_wahler — Tue, 29 Jul 2014 15:24:16 GMT

Hi,

I'd like to receive UDP packets in a non-blocking way. The problem is that recvfrom returns error 0x1120.

Here's how I initialize the UDP socket:

socket_handle = socket(AF_INET, SOCK_DGRAM, 0);

server_socket_addr.sin_family = AF_INET;

server_socket_addr.sin_port = port;

server_socket_addr.sin_addr.s_addr = INADDR_ANY;

status = bind(socket_handle, &server_socket_addr, sizeof(server_socket_addr));

uint32_t opt_value = TRUE;

uint32_t opt_length = sizeof (uint32_t);

status = setsockopt (

socket_handle,

SOL_UDP,

OPT_RECEIVE_NOWAIT,

&opt_value,

opt_length

);

_UDP_max_queue_size = 1;

Cyclically, I call

recvfrom(socket_handle, buffer, sizeof(buffer), 0, &client_socket_addr, &socket_addr_len)

But this line returns error 0x1120. In rtcs_err.h the corresponding line says

#define RTCSERR_OUT_OF_BUFFERS (RTCS_ERROR_BASE|0x120)

Any ideas how to solve this problem? The blocking variant works, by the way.

Kind regards

Michael

Setup: CW 10.6, MQX 4.1, TWR-K60F120M

Re: Non-blocking UDP receive problem - Error 0x1120

Martin_ — Wed, 30 Jul 2014 04:18:13 GMT

It might be application specific configuration of system resources available for RTCS. Try to increase those before RTCS_create() in similar way as in the example below:

  /* Init RTCS */
  _RTCSPCB_init = 4;
  _RTCSPCB_grow = 2;
  _RTCSPCB_max = 20;
  _RTCS_msgpool_init = 4;
  _RTCS_msgpool_grow = 2;
  _RTCS_msgpool_max  = 20;
  _RTCS_socket_part_init = 4;
  _RTCS_socket_part_grow = 2;
  _RTCS_socket_part_max  = 20;
  _UDP_max_queue_size = 100;
   
  _RTCSTASK_stacksize = 4500;
   
  error = RTCS_create();

Re: Non-blocking UDP receive problem - Error 0x1120

michael_wahler — Wed, 30 Jul 2014 07:12:28 GMT

Thanks for your answer. Unfortunately, this does not help. With these parameters, recvfrom receives an empty buffer 20 times and then fails with the same error again.

Any other ideas?

Re: Non-blocking UDP receive problem - Error 0x1120

Martin_ — Wed, 30 Jul 2014 07:24:38 GMT

Then please check the priority of your application task and compare with the priority of TCP/IP task. By default the priority of TCP/IP task is set to 6. Your application task shall have lower priority (higher number = 7, 8 ...).

Seems like you don't allow the TCP/IP task to service and free the allocated messages, that might be MQX task priority problem.

Re: Non-blocking UDP receive problem - Error 0x1120

michael_wahler — Wed, 13 Aug 2014 13:39:35 GMT

Hi Martin,

I checked the priorities of my tasks:

TCP/IP task - prio 6

Main task (MQX_AUTO_START_TASK) - prio 9

- spawns hw timer task - prio 7

Still not working though :smileysad: Any other ideas?

Michael