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Breaking subprocess loop from parent process
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Breaking subprocess loop from parent process
#1
What is missing here to read the sent value into my_input and break the loop in tok2.py? Now it runs forever.

Using Debian 10 Buster with Python 3.7.

# tok1.py

import sys
import time
import subprocess

command = [sys.executable, 'tok2.py']
proc = subprocess.Popen(command, stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE)

i=0
while proc.poll() is None:
    if i > 5:
        #Send BreakLoop after 5th iteration
        proc.stdin.write(b'exit')
        
    print('tok1: '  + str(i))

    time.sleep(0.5)
    i=i+1
#tok2.py

import sys
import time

ii=0
my_input =''

while True:
    my_input = sys.stdin.read()
    
    if my_input == b'exit':
        print('tok2: exiting')
        sys.stdout.flush()
        break
  
    print('tok2: ' + str(ii))
    sys.stdout.flush()
    ii=ii+1    
    
    time.sleep(0.5)
Reply


Messages In This Thread
Breaking subprocess loop from parent process - by kapibara - Aug-19-2019, 01:48 AM

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