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Entry  14 Nov 2024, Mann Gandhi, Suggestion, Issue with creating banks Screenshot_from_2024-11-14_12-35-06.png
    Reply  14 Nov 2024, Stefan Ritt, Suggestion, Issue with creating banks 
       Reply  14 Nov 2024, Mann Gandhi, Suggestion, Issue with creating banks 
    Reply  15 Nov 2024, Konstantin Olchanski, Suggestion, Issue with creating banks 
Message ID: 2893     Entry time: 14 Nov 2024     Reply to this: 2894   2896
Author: Mann Gandhi 
Topic: Suggestion 
Subject: Issue with creating banks 
Hello, I am a coop student working at SNOLAB. I am currently setting up a frontend 
program to collect data for an experiment I am currently having with my bank being 
initialized correctly with the correct name. I will attach an image of the error and 
a code snippet for clarity. This is a multi-thread program using ring buffers. The 
first thread  is only responsible for data collection of ADC values from the Red 
Pitaya (FPGA) and the second thread does a simple derivative calculation. The 
frontend makes use of the TCP connection to stream data from the Red Pitaya. 

Here is the code snippet. This is the only place in the frontend code where I 
initialize and create a bank to store the ADC values from the Red Pitaya. 

void* data_acquisition_thread(void* param)
{
	printf("Data acquisition thread started\n");
	// Obtain ring buffer for inter-thread data exchange
	EVENT_HEADER *pevent;
	WORD *pdata;
	int status;

	//Set a timeout for the recv function to prevent indefinite blocking
	struct timeval timeout;
	timeout.tv_sec = 10; //seconds
	timeout.tv_usec = 0; // 0 microseconds
	setsockopt(stream_sockfd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout, 
sizeof(timeout));



	while (is_readout_thread_enabled())
	{

		if (!readout_enabled())
		{
			usleep(10); // do not produce events when run is stopped
			continue;
		}
		// Acquire a write pointer in the ring buffer
		int status;
		do {
			status = rb_get_wp(rbh, (void **) &pevent, 0);
			if (status == DB_TIMEOUT)
			{
				usleep(5);
				if (!is_readout_thread_enabled()) break;
			}
		} while (status != DB_SUCCESS);

		if (status != DB_SUCCESS) continue;

		// Lock mutex before accessing shared resources
		pthread_mutex_lock(&lock);

		// Buffer for incoming data
		//int16_t temp_buffer[4096] = {0};

		bm_compose_event_threadsafe(pevent, 1, 0, 0, 
&equipment[0].serial_number);
        pdata = (WORD *)(pevent + 1);  // Set pdata to point to the data section of 
the event

		// Initialize the bank and read data directly into the bank
        bk_init32(pevent);
        bk_create(pevent, "RPD0", TID_WORD, (void **)&pdata);

		int bytes_read = recv(stream_sockfd, pdata, max_event_size * 
sizeof(WORD), 0);
		printf("Data received: %d bytes\n", bytes_read);


		if (bytes_read <= 0)
		{
			if (bytes_read == 0)
			{
				printf("Red Pitaya disconnected\n");
				pthread_mutex_unlock(&lock);
				break;

			} else if (errno == EWOULDBLOCK || errno ==EAGAIN)
			{
				printf("Receive timeout\n");
				pthread_mutex_unlock(&lock);
				continue;
			}

			else
			{
				printf("Error reading from the Red Pitaya: %s\n", 
strerror(errno));
				pthread_mutex_unlock(&lock);
				continue;
			}

		}
		
		 // Adjust data pointers after reading
        pdata += bytes_read / sizeof(WORD);
        bk_close(pevent, pdata);

        pevent->data_size = bk_size(pevent);

		// Unlock mutex after writing to the buffer
		pthread_mutex_unlock(&lock);

		// Send event to ring buffer
		rb_increment_wp(rbh, sizeof(EVENT_HEADER) + pevent->data_size);
	}
	pthread_mutex_unlock(&lock);

	return NULL;
}
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