SPMD multiple calls for function

Hi. I am creating two parallel calls using spmd, one will receive data through socket and send the data to other worker using labsend.

after that i expect the system to exit out properly, but the 1st worker is called again and raises an error.

% parpool(2) 
% parfevalOnAll(@maxNumCompThreads, 0, 2)
main.m
spmd(2)
    labindex
    if labindex == 1
        init();
    else
        a = plot_fn();
    end
end
% to delete the parpool
figure(1)
plot(a{2});
p = gcp;
delete(p)

init.m
% Testing Asynchronous data communication
function [udp_sock] = init()
    udp_sock = udp('127.0.0.1',8000, 'LocalPort', 8000);
    try
    % Code to be executed goes here.
         udp_sock.Status
         fopen(udp_sock);
    catch
        udp_sock.Status
        disp('Already open');
    end
   
    sampleXMLfile = 'blk_id.xml';
    matlab_struct = parseXML(sampleXMLfile);

    udp_sock.Status
    udp_sock.ReadAsyncMode = 'continuous';
    udp_sock.DatagramTerminateMode = 'off';

    udp_sock.BytesAvailable
    store = corres_data_type(matlab_struct.Children(2).Children(2).Children(2).Attributes(3).Value);
    val = 1
    mystring = fread(udp_sock, 2, store);
    my_new_val = fread(udp_sock, mystring(2), 'char');
    labsend(my_new_val, 2);
    val = 2
    fclose(udp_sock);
end

plot_fn.m
function [data] = plot_fn()
    srcWkrIdx = 1
    [data] = labReceive(srcWkrIdx);s
    %a = data;
end