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[lwip-users] lwip + FreeRTOS socket sharing error

From: alweib
Subject: [lwip-users] lwip + FreeRTOS socket sharing error
Date: Thu, 26 Apr 2018 10:49:14 -0700 (MST)

Hey everyone,

I'm having an issue sharing a TCP socket between two tasks in FreeRTOS (v.
7.0) and LWIP(v. 1.40).

I'm using the socket for a cmd / reply interface and also to send
information back asynchronously. These 2 ways of writing to the socket are
of course in two different tasks. I'm usign a semaphore to control access to
the socket:

bool wdpshell_write(void* data,int l){
if(pxNewWdpConnection != NULL)
    xSemaphoreTake( xSemaphoreWdpBlock, portMAX_DELAY);
    bool err = (ERR_OK == netconn_write(pxNewWdpConnection, data, l,
    xSemaphoreGive( xSemaphoreWdpBlock );
    return err;
  return false;

It works fine when only the cmd / reply or the async sends info back,
without the other running, but when both run i lose the connection. Setting
in a delay (vTaskDelay( webSHORT_DELAY );) after the semaphore take cmd, it
seems to work. Can anyone explain this behaviour? It would be very
detrimental for performance if there should be a delay for all traffic in
that direction.

It should be noted that i read on one task while writing in the other task,
but this should be allowed (as long as i don't do the same (R or W) in both
tasks at the same time).

Thanks in advance.


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