Answers for "multi threading python scripts"

14

threading python example

# A minimal threading example with function calls
import threading
import time

def loop1_10():
    for i in range(1, 11):
        time.sleep(1)
        print(i)

threading.Thread(target=loop1_10).start()

# A minimal threading example with an object
import threading
import time


class MyThread(threading.Thread):
    def run(self):                                         # Default called function with mythread.start()
        print("{} started!".format(self.getName()))        # "Thread-x started!"
        time.sleep(1)                                      # Pretend to work for a second
        print("{} finished!".format(self.getName()))       # "Thread-x finished!"

def main():
    for x in range(4):                                     # Four times...
        mythread = MyThread(name = "Thread-{}".format(x))  # ...Instantiate a thread and pass a unique ID to it
        mythread.start()                                   # ...Start the thread, run method will be invoked
        time.sleep(.9)                                     # ...Wait 0.9 seconds before starting another

if __name__ == '__main__':
    main()
Posted by: Guest on December-05-2020
1

python threading vs multiprocessing

The Python threading module uses threads instead of processes.
Threads uniquely run in the same unique memory heap.
Whereas Processes run in separate memory heaps.
This makes sharing information harder with processes and object instances.
One problem arises because threads use the same memory heap,
multiple threads can write to the same location in the memory heap
which is why the global interpreter lock(GIL) in CPython was created
as a mutex to prevent it from happening.
Posted by: Guest on September-22-2020

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