Python’s Concurrency

concurrent.futures

Docs

https://docs.python.org/3/library/concurrent.futures.html

基本使用

concurrent.futures 提供了高階的界面來操作, 在使用上更方便。

Thread:

from concurrent.futures import ThreadPoolExecutor

with ThreadPoolExecutor(max_workers=1) as executor:
    future = executor.submit(pow, 323, 1235)
    print(future.result())

Process:

from concurrent.futures import ProcessPoolExecutor

with ProcessPoolExecutor(max_workers=1) as executor:
    future = executor.submit(pow, 323, 1235)
    print(future.result())

timeout

from concurrent.futures import ProcessPoolExecutor, TimeoutError
import time

def stop_process_pool(executor):
    for pid, process in executor._processes.items():
        process.terminate()
    executor.shutdown()

with ProcessPoolExecutor(max_workers=1) as executor:
    future = executor.submit(time.sleep, 10)
    try:
        print(future.result(timeout=1))
    except TimeoutError:
        print("this took too long...")
        stop_process_pool(executor)