[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

Hi there, everyone.
I'm sorry for my rash remarks about the state of IDLE, I'm sure it is alive and 
well and its good to see that fine people like Terry are working on keeping it 
up to date.

Michael, please understand that python developers are volunteers and sometimes 
need help to fix things.  In this case, we have not been able to reproduce the 
problem, and are not sure what can be causing it.  My suggestion for you to 
modify code would be a step in identifying and diagnosing the problem.  Without 
such feedback it is hard to accomplish anything.

Cheers!

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Terry J. Reedy]

Terry J. Reedy added the comment:

Michael, IDLE is not dead, and I am working steadily to modernize it inside and 
out for 3.6.  There have even been improvements for 2.7 since 2.7.5.  For his 
work, Kristján has had no reason to keep up to date on IDLE's progress.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Zachary Ware]

Zachary Ware added the comment:

If you're still using 2.7.5, we can't help you.  If you can reproduce the issue 
with 2.7.11 or 3.5.1, please reopen.

--
resolution:  -> out of date
stage:  -> resolved
status: open -> closed
type: resource usage -> behavior

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[MICHAEL JACOBSON]

MICHAEL JACOBSON added the comment:

I also do not want to change something in the /lib folder because that is like 
going into the Windows Registry and 'fixing' a bunch of stuff.

I've made other games with PyGame and they generate errno 10035, too.
I've also installed the same version of Python, on a newer computer.
It is a Windows 10, ex-8.1
I haven't finished the program on my newer computer.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[MICHAEL JACOBSON]

MICHAEL JACOBSON added the comment:

Kristján, when you say 'dead or dying code', it worries me a lot.  Can you tell 
me what you mean because I do NOT want to reinstall IDLE.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

I think that the select.select calls there are a red herring, since I see no 
evidence that the rpc socket is ever put in non-blocking mode.
But the line
self.rpcclt.listening_sock.settimeout(10)
indicates that the socket is in timeout mode, and so, the error could be 
expected if it weren't for the backported fix for issue #9090

I'll have another look at that code and see if thera are any loopholes.

Also, Micahel could try commenting out this line in 
C:\Python27\Lib\idlelib\PyShell.py:
 self.rpcclt.listening_sock.settimeout(10)

and see if the problem goes away.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Terry J. Reedy]

Terry J. Reedy added the comment:

Kristján, thank you for the response.  The socket communication part of IDLE is 
pretty much a black box to me.  Just to clarify, you are saying that select 
polling is only needed for non-blocking sockets; sockets are blocking by 
default; and you see no override of the default.  Me neither.  It would be nice 
to know.  Idlelib.PyShell has the following lines: 
<445>self.rpcclt.listening_sock.settimeout(10)
<561>response = clt.pollresponse(self.active_seq, wait=0.05)
The wait is ultimately passed to rpc.py, line 353:
r, w, x = select.select([self.sock.fileno()], [], [], wait)

(IDLE is very much in use, and I hope to modernize the 3.x version, and perhaps 
replace the sockets with non-blocking use of pipes.)

Michael: I cannot change 2.7.5 and I am not inclined to change 2.7.12+ until I 
know there is a problem with the current 2.7 release.  Numerous people are 
using IDLE with 2.7.11 (and 3.x) on Windows without problems.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

Caveat emptor:  I know nothing of IDLE, and I even suspect it to be dead or 
dying code.  Non the less, it could be patched.

I found this in the code:
def putmessage(self, message):
self.debug("putmessage:%d:" % message[0])
try:
s = pickle.dumps(message)
except pickle.PicklingError:
print >>sys.__stderr__, "Cannot pickle:", repr(message)
raise
s = struct.pack(" 0:
try:
r, w, x = select.select([], [self.sock], [])
n = self.sock.send(s[:BUFSIZE])
except (AttributeError, TypeError):
raise IOError, "socket no longer exists"
except socket.error:
raise
else:
s = s[n:]


If the socket were non-blocking, this would be the place to add a handler to 
catch socket.error with errno=errno.EWOULDBLOCK

However, I can't see that this socket is non-blocking.  Perhaps I have some 
blindness, but the select calls seem to be redundant to me, I can't see any 
sock.setblocking(False) or sock.settimeout(0.0) being done anywhere.


Having said that, the following change can be made (which is the prudent way to 
use select/send anyway)
while len(s) > 0:
try:
while True:
r, w, x = select.select([], [self.sock], [])
try:
n = self.sock.send(s[:BUFSIZE])
break
except socket.error as e:
import errno # should be done at the top
if e.errno != errno.EWOULDBLOCK:
raise
except (AttributeError, TypeError):
raise IOError, "socket no longer exists"
except socket.error:
raise
else:
s = s[n:]

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Kristján Valur Jónsson]

Kristján Valur Jónsson added the comment:

Hi there.
I don't think this is in relation to issue #9090.
That one had to do with the internal mechanisms of doing blocking IO with 
timeout.  this is done internally by using non-blocking sockets and select(), 
and the backport dealt with some edge cases on windows where select() could 
falsely indicate that data were ready.

>From what I can see in this error description, we are dealing with real 
>non-blocking IO, i.e. an application is using select and non-blocking sockets.

It is possible that this windows edge case is now being elevated into the 
application code and whatever select() logic being used in rpc.py needs to be 
aware of it, or that for some reason this socket is supposed to be blocking, 
but isn't.

I'll have a quick look at idlelib and see if I can see anything.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Terry J. Reedy]

Terry J. Reedy added the comment:

No, admin privileges should not be needed to run Command Prompt.  Ditto for 
python if you did not already need same to run IDLE.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[MICHAEL JACOBSON]

MICHAEL JACOBSON added the comment:

Is the command prompt itself admin?
I don't have access to the admin command prompt.

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Terry J. Reedy]

Terry J. Reedy added the comment:

0. OK, 2.7.5 came out in 2013 May, after the 2.7 backport.  Kristján, you did 
the backport.  Do you have any idea about this?

1. Open a Command Prompt window, the command line console.  For Win 7, it can 
be found find it on the Start menu under Admin or something or started on the 
run line with 'cmd.exe'.  You should learn how to get the console.

On the command line, after the ...> prompt, enter "python patth/to/Skier.py".

Or, maybe, find Skier.py in Windows Explorer, and either double click or 
right-click and select "Run".  (I am not sure if this works with 2.7.5 on 
Vista.)

--
keywords: +3.4regression
nosy: +kristjan.jonsson

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[MICHAEL JACOBSON]

MICHAEL JACOBSON added the comment:

0. I have Python 2.7.5
1. I don't know what you mean.
2. It fails right when I run it.
IDLE stands for Python's Integrated DeveLopment Environment
I am running IDLE / Python on a Windows Vista, Service pack 2

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[Terry J. Reedy]

Terry J. Reedy added the comment:

Michael, when you open an issue, you need to stay nosy so we can ask questions. 
 This is especially true when the issue involved 3rd party modules, like 
pygame, and even more, when personal files, like the images, are required.  In 
this case:

0. Which patch release of 2.7 are you running?  If not 2.7.11, please upgrade 
and retry.  There was a patch for Error 10035 in March 19, 2013, which would be 
about the time of 2.7.6 or so.
https://hg.python.org/cpython/rev/8ec39bfd1f01 #9090

1.Does your program run correctly when you run it directly with python from the 
console, with "python pathto/Skier"?

2. Were you running it from the IDLE editor?  If so, does it fail immediately? 
or after the game runs a bit?  Does it seem to always fail in exactly the same 
way, at the same time?

[A 'socket' is a class abstraction used to communicate between different 
processes.  It is usually used for processes on different machines, as with the 
browser process on your machine and a server process on another machine, but 
can be used for two processes on the same machine.]

--
This appears to be a socket issue, not an IDLE issue as such, just as #25332 
was not a urllib issue.  This is the 10th issue found searching the tracker for 
'Error 10035', but the first, I think, involving IDLE.  I know essentially 
nothing about the subject.

--
nosy: +MICHAEL JACOBSON, terry.reedy

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[issue26739] idle: Errno 10035 a non-blocking socket operation could not be completed immediately

[STINNER Victor]

Changes by STINNER Victor :


--
components: +IDLE
nosy: +paul.moore, steve.dower, tim.golden, zach.ware
title: Errno 10035 a non-blocking socket operation could not be completed 
immediately -> idle: Errno 10035 a non-blocking socket operation could not be 
completed immediately

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