Question

我运行了一个程序test.py。由于它经常崩溃，我导入subprocess以在停止时重新启动它。有时我发现子进程无法成功重启。因此，我强制程序每60分钟重新启动一次。但我发现有时两个test.py处理同时运行。我的代码有什么问题以及如何修复它？我使用的是Windows 7操作系统。 Plz检查以下代码并提前感谢：

import subprocess
import time
from datetime import datetime

p = subprocess.Popen(['python.exe', r'D:\test.py'], shell=True)
minutes = 1
total_time = 0
while True:
    now = datetime.now()

    #periodly restart
    total_time += 1
    if total_time % 100 == 0:
        try:
            p.kill()
        except Exception as e:
            terminated = True
        finally:
            p = subprocess.Popen(['python.exe', r'D:\test.py'], shell=True)

    #check and restart if it stops
    try:
        terminated = p.poll()
    except Exception as e:
        terminated = True
    if terminated:
        p = subprocess.Popen(['python.exe', r'D:\test.py'], shell=True)
    time.sleep(minutes * 60)

Answer 1

虽然我对您的设计完全不同意，但具体问题在于：

except Exception as e:
        terminated = True
finally:
        p = subprocess.Popen(['python.exe', r'D:\test.py'], shell=True)

如果抛出Exception，您将terminated设置为true，然后立即重新启动子流程。然后，您稍后检查：

if terminated:
    p = subprocess.Popen(['python.exe', r'D:\test.py'], shell=True)

此时，terminated为true，因此它启动了一个新的子流程。但是，它已经在finally块中完成了。

真的，你应该做的就是在杀人尝试期间不再费心重启：

    try:
        p.kill()
    except Exception:
        # We don't care, just means it was already dead
        pass
    finally:
        # Either the process is dead, or we just killed it. Either way, need to restart
        terminated = True

然后您的if terminated子句将正确地重新启动该过程，您将不会有重复。

为什么子进程无法成功杀死旧的进程？

1 个答案: