Gunicorn + Subprocesses引發異常[Errno 10]

我偶然發現了一個奇怪的異常，我一直無法解決......任何人都可以提出什麼是錯誤的或新的設計？我正在運行Gunicorn/Flask應用程序。在配置文件中，我指定了一些與on_starting hook有關的工作[1]。裏面的那個勾代碼，我有這樣的（沒有任何幻想）一些代碼：Gunicorn + Subprocesses引發異常[Errno 10]

# Called before the server is started 
my_thread = package.MyThread() 
my_thread.start()

的package.MyThread類看起來像下面這樣。 ls命令不重要，它可以是任何命令。

class MyThread(threading.Thread): 
    """ 
    Run a command every 60 seconds. 

    """ 
    def __init__(self): 
    threading.Thread.__init__(self) 
    self.event = threading.Event() 

    def run(self): 
    while not self.event.is_set(): 
     ptest = subprocess.Popen(["ls"], stdout=subprocess.PIPE) 
     ptest.communicate() 
     self.event.wait(60) 

    def stop(self): 
    self.event.set()

一旦啓動服務器，我總是帶有此異常：

Exception in thread Thread-1: 
Traceback (most recent call last): 
    File "/usr/lib64/python2.6/threading.py", line 532, in __bootstrap_inner 
    self.run() 
    File "__init__.py", line 195, in run 
    ptest.communicate() 
    File "/usr/lib64/python2.6/subprocess.py", line 721, in communicate 
    self.wait() 
    File "/usr/lib64/python2.6/subprocess.py", line 1288, in wait 
    pid, sts = _eintr_retry_call(os.waitpid, self.pid, 0) 
    File "/usr/lib64/python2.6/subprocess.py", line 462, in _eintr_retry_call 
    return func(*args) 
OSError: [Errno 10] No child processes

任何人都可以提出什麼是怎麼回事？我還沒有嘗試實施[2]中的更改，他們似乎很拙劣。

[1] - http://gunicorn.org/configure.html#server-hooks

[2] - Popen.communicate() throws OSError: "[Errno 10] No child processes"

來源

2012-01-06 sholsapp