[mod_python] ioerrors with worker thread mpm

Michael Barton mike at weirdlooking.com
Wed Dec 10 22:57:13 EST 2008

Yes, sorry.  The exceptions I've seen are raised by sendall and recv
on socket objects inside httplib, which is connected to a service.  I
can reproduce this with a very simple handler like,

  from mod_python import apache
  from socket import socket

  def handler(req):
      s = socket()
      s.connect(('localhost', 80))
      return apache.OK

Make a request to that handler, which will obviously not return any
time soon.  Then hit the server enough times that it reaches
MaxRequestsPerChild.  And,

  File "/home/redbo/test/modpython_handler.py", line 7, in handler\n
error: (4, 'Interrupted system call')

On Wed, Dec 10, 2008 at 9:19 PM, Graham Dumpleton
<graham.dumpleton at gmail.com> wrote:
> Blocking i/o operations against what? Sockets you have created off to
> something else????
> 2008/12/11 Michael Barton <mike at weirdlooking.com>:
>> Hey list!
>> I'm having a problem adapting a mod_python-based app to work with
>> Apache's worker thread mpm.
>> When the process hits MaxRequestsPerChild under a high concurrency of
>> requests, blocking i/o operations in other threads on that child raise
>> exceptions (mostly EINTR or EAGAIN IOErrors in httplib).
>> It looks like system calls are being interrupted by signals Apache
>> uses to control its children.  But that seems like a problem that
>> would have come up before, and I can't find much by searching the web
>> or list archives.
>> I figured I'd punt to the list and see if anyone has other thoughts.
>> My setup is: debian, apache 2.2.3, mod_python 3.3.1, python 2.4.4
>> --Mike
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