Python: Show the individual process IDs involved

Last update on December 21 2024 07:18:54 (UTC/GMT +8 hours)

Multiprocessing Process IDs

In multiprocessing, processes are spawned by creating a Process object.
Write a Python program to show the individual process IDs (parent process, process ID etc.) involved.

Sample Solution:

Python Code:

# Import the 'Process' class from the 'multiprocessing' module.
from multiprocessing import Process

# Import the 'os' module for interacting with the operating system.
import os

# Define a function 'info' to print process-related information.
def info(title):
    print(title)
    print('module name:', __name__)
    print('parent process:', os.getppid())
    print('process id:', os.getpid())

# Define a function 'f' that takes a name as an argument.
def f(name):
    # Call the 'info' function to print process-related information.
    info('function f')
    # Print a greeting using the provided name.
    print('hello', name)

# Check if the script is being run as the main program.
if __name__ == '__main__':
    # Call the 'info' function to print process-related information for the main process.
    info('Main line')

    # Create a new 'Process' object, specifying the target function 'f' and its arguments.
    p = Process(target=f, args=('bob',))

    # Start the new process.
    p.start()

    # Wait for the child process to complete before continuing.
    p.join()

Sample Output:

Main line
module name: __main__
parent process: 23967
process id: 27986
function f
module name: __main__
parent process: 27986
process id: 27987
hello bob

Explanation:

Here is a breakdown of the above Python code:

• Module Imports:
• The code imports the 'Process' class from the 'multiprocessing' module for working with processes.
• The 'os' module is imported for interacting with the operating system.
• Function definitions:
• The 'info' function prints information about the module name, parent process ID, and process ID.
• The 'f' function prints a greeting using the provided name.
• Main Program:
• The script checks if it is being run as the main program using if name == '__main__':.
• Process creation and execution:
• A new 'Process' object is created, specifying the target function 'f' and its arguments.
• The child process is started using p.start().
• The script waits for the child process to complete before continuing using p.join().

Flowchart:

Python Code Editor:

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