FreeRtos problems in ADC task and Streaming Task - c

Question

I have an ADC task that uses 4 channels and uses the DMA for transfer I also have a streaming client which streams the ADC data through the TCP socket I made the ADS Task lower priority than the streaming client.
I'm sending an integer that selects which ADC channel is selected as a message queue to the streaming client.
The problem is I get queue overflow when sending that adc channel integer.
ADC TASK
if(bufferSelect != BUFFERS_NOT_READY)
{
if(xQueueSend(g_adcQueue, &bufferSelect, 0) != pdPASS)
{
throwError(ERROR_MESSAGE_QUEUE_FULL);
PRINTF("%s\r\n", getErrorMessage(ERROR_MESSAGE_QUEUE_FULL));
}
bufferSelect = BUFFERS_NOT_READY;
}
Streaming client task
/* obtain next buffer ready event */
if(xQueueReceive(g_adcQueue, &bufferSelect, 0) == pdFALSE)
{
g_stopStreaming = true;
continue;
}

Answer 1

You seem to handle the queue full status as an error, which it normally isn't - One of the purposes of queues is to back-pressure the producer, and that is exactly what you should do here: If the streaming task cannot digest the data you are throwing at it, you are simply producing too much.
The priority of the consumer does only help keeping queue fill state at a reasonable level when there is no inactive (waiting for I/O) periods in the consumer code. As soon as you have such wait periods in your consumer, priority alone doesn't relieve you from accepting that queues can become full.