遇到的Python并发编程问题实例分享

原创曾经终败给现在 2024-12-31 16:39 40阅读 0赞

在Python并发编程中，我们经常会遇到各种问题。以下我将列举几个常见问题并提供实例：

1. **竞态条件**：
   例：多个线程同时读写同一个共享变量。
   ```python
   import threading

count = 0
   lock = threading.Lock()

def increment():
       with lock:
           count += 1
           print(f"Thread {threading.current_thread().name} incremented to {count}")

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

for t in threads:
       t.join()
   ```

2. **死锁**：
   例：两个线程互斥资源，形成循环等待。
   ```python
   import threading

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

def acquire_lock(lock):
       print(f"Thread {threading.current_thread().name}} acquired {lock} lock.")
       lock.acquire()
       print(f"Thread {threading.current_thread().name}} released {lock} lock.")

t1 = threading.Thread(target=acquire_lock, args=(lock1,), name="Thread 1"))
   t2 = threading.Thread(target=acquire_lock, args=(lock2,), name="Thread 2"))

t1.start()
   t2.start()

t1.join()
   t2.join()
   ```

3. **资源泄漏**：
   例：线程在执行过程中没有正确释放共享资源。
   ```python
   import threading

count = 0
   shared_lock = threading.Lock()

def increment():
       with shared_lock:
           count += 1
           print(f"Thread {threading.current_thread().name}} incremented to {count}")

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

for t in threads:
       t.join()
   ```

以上就是Python并发编程中常见问题的实例分享，希望对你理解并解决相关问题有所帮助。