等待来自多个对象的任务

import threading

lock1 = threading.Lock()
lock2 = threading.Lock()

def task1():
    with lock1:
        with lock2:
            print("Task 1")

def task2():
    with lock2:
        with lock1:
            print("Task 2")

t1 = threading.Thread(target=task1)
t2 = threading.Thread(target=task2)

t1.start()
t2.start()

t1.join()
t2.join()

import threading

counter = 0
lock = threading.Lock()

def increment():
    global counter
    for _ in range(100000):
        with lock:
            counter += 1

t1 = threading.Thread(target=increment)
t2 = threading.Thread(target=increment)

t1.start()
t2.start()

t1.join()
t2.join()

print(counter)  # 输出应该是200000

import concurrent.futures

def task(n):
    return n * n

with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor:
    futures = [executor.submit(task, i) for i in range(10)]
    results = [future.result() for future in concurrent.futures.as_completed(futures)]

print(results)