Python multithreading print error with the integrated terminal

[Meano]

• VSCode Version: Code 1.18.1 (929bacb, 2017-11-16T18:32:36.023Z)
• OS Version: Windows_NT x64 10.0.16299
• Extensions:

Extension	Author (truncated)	Version
code-gnu-global	aus	0.2.2
python	ms-	0.8.0
cpptools	ms-	0.14.4

---

Steps to Reproduce:

1. create python script:

from multiprocessing import Pool, cpu_count
import traceback
import sys

def printfunc(msg):
    for i in range(20):
        print "TEST "+ str(msg) +" Count:" + str(i)
    return 0

if __name__ == "__main__":
    try:
        testlist = list(range(1000))
        pool_size = cpu_count()
        pool = Pool(processes=pool_size)
        print "Pool Size:", pool_size
        pool.map(printfunc, testlist)
        pool.close()
        pool.join()
    except Exception,e:
        pool.terminate()
        traceback.print_exc()
        sys.exit(1)

2. execute the script in integrated terminal will print error message like:

3. but the script has no errors execute in external terminal (cmd or powershell)

Reproduces without extensions: Yes

[Tyriar]

@ivankravets looks like this is the same as platformio/platformio-vscode-ide#61?

[ivankravets]

@Tyriar Yes, the same. In our case, the problem is linked with urllib2 library. However, the root of a problem is the same IOError: [Errno 0] Error.

This is a very specific issue. I can't reproduce it on my Windows VMs :(

[Meano]

@ivankravets I've tested it in windows7 and the issue can't be reproduced. It seems to be related to the OS version. And the problem may happened after I update to Windows 10 1703.

[ivankravets]

@Meano does Python's socket work for you? Could you try this script

from urllib2 import urlopen

url = "http://dl.platformio.org/packages/toolchain-xtensa-windows-1.40802.0.tar.gz"

r = urlopen(url)
i = 0
for chunk in r.read(1024):
    i += 1
    print i

It fails for me between 10-30 iterations.

[Meano]

Failed, print error.

[ivankravets]

Cool! Let's wait when @Tyriar will fix it. I don't know why Python users don't report this issue. Maybe, they don't use built-in terminal :)

[Tyriar]

@rprichard any idea what could be happening here? Interestingly it doesn't seen to happen with @ivankravets's pty.js fork which is still on winpty@0.2 (their Atom extension uses that one).

More info: platformio/platformio-vscode-ide#61

[kzhui125]

for num in range(0,1000):
    print str(num)

using python 2.7, integrated terminal is unusable now

[rprichard]

@Tyriar: @segevfiner filed an upstream winpty issue (rprichard/winpty#134). I looked into it, and it looks like a Windows bug, which I filed here: microsoft/terminal#40. I doubt winpty can work around this problem.

FWIW, the legacy console shouldn't be affected by this issue.

It looks like Python 3 is also unaffected. Maybe it uses WriteConsoleW instead of WriteFile.

[khouzam]

Thanks, this is indeed a console issue that we've addressed, it's the same issue as #36630.

[Tyriar]

Thanks all! I'll close it out in favor of #36630 then.