使用Python进行并发编程时常见问题实例

原创深藏阁楼爱情的钟 2024-12-14 15:51 6阅读 0赞

在Python的并发编程中，常见的问题和实例包括：

1. **线程同步**：
   - **锁问题**：例如竞态条件（Race Condition），可能导致数据不一致。
   ```python
   import threading

lock = threading.Lock()

def thread_function():
       with lock:
           print("Thread 1: Lock acquired")
           # ... do some work
           print("Thread 1: Lock released")

thread_1 = threading.Thread(target=thread_function))
   thread_2 = threading.Thread(target=thread_function))

thread_1.start()
   thread_2.start()

thread_1.join()
   thread_2.join()
   ```
   
2. **进程间通信（IPC）**：
   - **死锁问题**：多个线程相互等待资源导致无法继续。
   ```python
   import threading

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

def thread_function(lock):
       with lock:
           print("Thread 1: Lock acquired")
           # ... do some work
           print("Thread 1: Lock released")

thread_1 = threading.Thread(target=thread_function, args=(lock1,))))
   thread_2 = threading.Thread(target=thread_function, args=(lock2,))))

lock1.acquire()
   lock2.acquire()

thread_1.start()
   thread_2.start()

lock1.release()
   lock2.release()

thread_1.join()
   thread_2.join()
   ```

3. **资源利用率**：
   - **CPU泄漏**：线程或进程没有正确关闭，可能导致CPU资源浪费。
   ```python
   import os

def resource_leak():
       while True:
           print("Leaking CPU...")

os.system("python leak.py &")  # Start the leak in a background thread

time.sleep(10)  # Wait for 10 seconds

os.system("killall python")  # Terminate the leaked process
   ```

这些问题是Python并发编程中常见的挑战，理解并解决它们对于编写高效并发程序至关重要。