Multiprocessing while updating a text and graph

Hello Everyone.
I am very new to Streamlit and while building a small webpage i need a bit of help.

import matplotlib.pyplot as plt
import streamlit as st
import random
import time 
import multiprocessing

x = []
y = []
x2 = []
y2 = []
i = 0
x_max = 0
y_max = 0

def function1(x_max,y_max,i):
    with st.empty():
        while True:

            with open('data.txt','a') as f:
                f.write(str(random.randint(1+i,10+i)) + ',' + str(random.randint(1+i,10+i)) + '\n')

            with open("data.txt") as f:
                data = f.readlines()[-1]
                print(data)
                a,b = data.split(',')
                a = int(a)
                b = int(b)
                x.append(a)
                y.append(b)
                x2.append(a + 2)
                y2.append(b + 2)
                if x_max<a:
                    x_max = a
                if y_max<b:
                    y_max = b


            fig, ax = plt.subplots()
            ax.plot(x,y)
            ax.plot(x2,y2)
            st.pyplot(fig)

            i += 1
            time.sleep(0.1)


def function2():
    with st.empty():
        st.write("Max x:",x_max)
        st.write("Max y:",y_max)
        time.sleep(0.1)


if __name__ == "__main__":
    p1 = multiprocessing.Process(target=function1,args=(x_max,y_max,i))
    p2 = multiprocessing.Process(target=function2)

    p1.start()
    p2.start()

    p1.join()
    p2.join()

    print("Done")

I am trying to read from a file and plotting the data read form the file in a graph.
Although i wanted to draw 2 graphs but i not able to find a way to do so, so i embedded 2 line graphs in one graph.

function 1 will update the graph on regular interval.
while the function 2 should print the maximum value of x and y and update them accordingly.
and over it i am using multiprocessing module to run both this function at the same time.
But when i went to see the output on the browser it just keeps on running and nothing shows up.
Please help.
Thank you…