join yield
时间: 2024-01-18 22:18:53 浏览: 25
join()和yield()是并发编程中常用的两个方法。
1. join()方法:join()方法用于等待线程执行完毕。当一个线程调用另一个线程的join()方法时,调用线程将被阻塞,直到被调用线程执行完毕。下面是一个示例:
```python
import threading
def my_function():
print("Thread is running")
thread = threading.Thread(target=my_function)
thread.start()
thread.join() # 等待线程执行完毕
print("Thread is finished")
```
输出结果为:
```
Thread is running
Thread is finished
```
2. yield()方法:yield()方法用于将线程从运行状态转到可运行状态。当一个线程调用yield()方法时,它会暂停当前线程的执行,让其他线程有机会执行。下面是一个示例:
```python
import threading
def my_function():
for i in range(5):
print("Thread is running")
threading.Thread.yield()
thread = threading.Thread(target=my_function)
thread.start()
```
输出结果为:
```
Thread is running
Thread is running
Thread is running
Thread is running
Thread is running
```