sys.exit()和os._exit()在进程和线程中使用的区别

Love The Way You Lie 2024-04-18 18:23 49阅读 0赞

os.\_exit()用于退出当前进程中的主线程  
sys.exit()用于退出当前线程

### 在另起的进程中使用os.\_exit() ###

import os
    import threading
    import time
    from multiprocessing import Process
    from threading import Thread
    
    
    def name():
        thread = threading.current_thread()
        return thread.getName()
    
    
    def one():
        i = 1
        while True:
            i += 1
            time.sleep(3)
            print("---one---", name())
            if i == 5:
                print("======os._exit======")
                os._exit(0)
    
    
    def two():
        while True:
            time.sleep(3)
            print("---two---", name())
    
    
    def process():
        t1 = Thread(target=one, args=())
        t2 = Thread(target=two, args=())
        t1.start()
        t2.start()
        while True:
            time.sleep(3)
            print("---process---", name())
    
    
    def main():
        p1 = Process(target=process)
        p1.start()
        while True:
            time.sleep(3)
            print("---main---", name())
    
    
    if __name__ == "__main__":
        main()

#### 执行结果： ####

当前程序终止在process函数，也就是主函数main()中的p1进程终止，也就是p1进程中的主线程，将会在执行os.\_exit()后，被终止。但是不会影响主进程中的主线程，比如main()函数会继续执行。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70]

### 在另起的线程中使用os.\_exit() ###

import os
    import threading
    import time
    from threading import Thread
    
    
    def name():
        thread = threading.current_thread()
        return thread.getName()
    
    
    def one():
        i = 1
        while True:
            i += 1
            time.sleep(3)
            print("---one---", name())
            if i == 5:
                print("======os._exit======")
                os._exit(0)
    
    
    def two():
        while True:
            time.sleep(3)
            print("---two---", name())
    
    
    def process():
        t1 = Thread(target=one, args=())
        t2 = Thread(target=two, args=())
        t1.start()
        t2.start()
        while True:
            time.sleep(3)
            print("---process---", name())
    
    
    def main():
        p1 = Thread(target=process)
        p1.start()
        while True:
            time.sleep(3)
            print("---main---", name())
    
    
    if __name__ == "__main__":
        main()

#### 执行结果： ####

当前程序终止在process函数，也就是主函数main()中的p1线程终止，也就是p1线程中的主线程，将会在执行os.\_exit()后，被终止，p1线程的主线程是main()中的线程，所以主线程也会结束。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70 1]

### 另起进程使用sys.exit() ###

import sys
    import threading
    import time
    from multiprocessing import Process
    from threading import Thread
    
    
    def name():
        thread = threading.current_thread()
        return thread.getName()
    
    
    def one():
        i = 1
        while True:
            i += 1
            time.sleep(3)
            print("---one---", name())
            if i == 5:
                print("======sys.exit======")
                sys.exit(0)
    
    
    def two():
        while True:
            time.sleep(3)
            print("---two---", name())
    
    
    def process():
        t1 = Thread(target=one, args=())
        t2 = Thread(target=two, args=())
        t1.start()
        t2.start()
        while True:
            time.sleep(3)
            print("---process---", name())
    
    
    def main():
        p1 = Process(target=process)
        p1.start()
        while True:
            time.sleep(3)
            print("---main---", name())
    
    
    if __name__ == "__main__":
        main()

### 执行结果： ###

执行sys.exit()后，sys.exit()所在的函数线程终止，也就是one()线程终止，但是不会影响其他的子线程和主线程或者其他进程。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70 2]

### 另起线程使用sys.exit() ###

import sys
    import threading
    import time
    from threading import Thread
    
    
    def name():
        thread = threading.current_thread()
        return thread.getName()
    
    
    def one():
        i = 1
        while True:
            i += 1
            time.sleep(3)
            print("---one---", name())
            if i == 5:
                print("======sys.exit======")
                sys.exit(0)
    
    
    def two():
        while True:
            time.sleep(3)
            print("---two---", name())
    
    
    def process():
        t1 = Thread(target=one, args=())
        t2 = Thread(target=two, args=())
        t1.start()
        t2.start()
        while True:
            time.sleep(3)
            print("---process---", name())
    
    
    def main():
        p1 = Thread(target=process)
        p1.start()
        while True:
            time.sleep(3)
            print("---main---", name())
    
    
    if __name__ == "__main__":
        main()

#### 执行结果： ####

另起线程和另起进程对于sys.exit()来说结果都是一样的，sys.exit()只会对当前的线程进行操作，当前运行是子线程，就会停止子线程，当前运行的是主线程，就会停止主线程。  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70 3]

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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70 1]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/0a62189e764541a18c4f299eef1cf6c0.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70 2]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/e05dafd4d76740169bcf835e95c6b335.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2d5bWFpc3ls_size_16_color_FFFFFF_t_70 3]: https://image.dandelioncloud.cn/pgy_files/images/2024/04/18/54e00b43f4bd4eb1af6f3890d5c20fcd.png