Concurrency and Modules

Starting Threads

The threading module runs a target function on another thread. Replay records which thread produced each trace event, then colors that activity in the same source pane.

Worker Function

thread_start_join.py 
import threading


def worker(name, limit):
    for step in range(1, limit + 1):
        message = name + ":" + str(step)
        print(message)


limit = 

alpha = threading.Thread(target=worker, args=("alpha", limit))
beta = threading.Thread(target=worker, args=("beta", limit))

alpha.start()
beta.start()
alpha.join()
beta.join()

print("done")

import threading


def worker(name, limit):
    for step in range(1, limit + 1):
        message = name + ":" + str(step)
        print(message)


limit = 

alpha = threading.Thread(target=worker, args=("alpha", limit))
beta = threading.Thread(target=worker, args=("beta", limit))

alpha.start()
beta.start()
alpha.join()
beta.join()

print("done")
start and join `start()` begins work on a new thread. `join()` waits until that thread has finished before the main thread continues.