当其中一个线程失败时，如何在多线程程序中确定退出代码？

import threading
import sys

exit_code = 0
lock = threading.Lock()

def worker():
    global exit_code
    try:
        # 模拟线程工作
        raise Exception("Thread failed")
    except Exception as e:
        with lock:
            exit_code = 1
        print(f"Thread failed: {e}")

threads = [threading.Thread(target=worker) for _ in range(5)]
for t in threads:
    t.start()
for t in threads:
    t.join()

print(f"Exit code: {exit_code}")
sys.exit(exit_code)

import threading
import sys

exit_event = threading.Event()
exit_code = 0

def worker():
    try:
        # 模拟线程工作
        raise Exception("Thread failed")
    except Exception as e:
        print(f"Thread failed: {e}")
        exit_event.set()
        exit_code = 1

threads = [threading.Thread(target=worker) for _ in range(5)]
for t in threads:
    t.start()

exit_event.wait()
for t in threads:
    t.join()

print(f"Exit code: {exit_code}")
sys.exit(exit_code)

import concurrent.futures
import sys

def worker():
    # 模拟线程工作
    raise Exception("Thread failed")

with concurrent.futures.ThreadPoolExecutor(max_workers=5) as executor:
    futures = [executor.submit(worker) for _ in range(5)]
    for future in concurrent.futures.as_completed(futures):
        try:
            future.result()
        except Exception as e:
            print(f"Thread failed: {e}")
            exit_code = 1

print(f"Exit code: {exit_code}")
sys.exit(exit_code)