cygwin: popen3 lock up

[jpsc986hj]

BPO	1495802
Files	unnamed

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = None
closed_at = <Date 2011-06-02.10:03:11.925>
created_at = <Date 2006-05-26.23:30:15.000>
labels = ['invalid', 'type-bug', 'library']
title = 'cygwin: popen3 lock up'
updated_at = <Date 2011-06-02.10:03:11.923>
user = 'https://bugs.python.org/jpsc986hj'

bugs.python.org fields:

activity = <Date 2011-06-02.10:03:11.923>
actor = 'neologix'
assignee = 'none'
closed = True
closed_date = <Date 2011-06-02.10:03:11.925>
closer = 'neologix'
components = ['Library (Lib)']
creation = <Date 2006-05-26.23:30:15.000>
creator = 'jpsc986_hj'
dependencies = []
files = ['18611']
hgrepos = []
issue_num = 1495802
keywords = []
message_count = 6.0
messages = ['28660', '28661', '28662', '114666', '114718', '137470']
nosy_count = 5.0
nosy_names = ['nnorwitz', 'jpsc986_hj', 'jpham', 'neologix', 'BreamoreBoy']
pr_nums = []
priority = 'normal'
resolution = 'not a bug'
stage = 'resolved'
status = 'closed'
superseder = None
type = 'behavior'
url = 'https://bugs.python.org/issue1495802'
versions = ['Python 3.1', 'Python 2.7', 'Python 3.2']

[jpsc986hj]

Look like I have similar problem with cygwin

I do the followings

si,so,se = os.popen3('make all')
dresult = so.readlines()
eresult = so.readlines()

where make all does a build - and with tons of error
on stderror. After x minutes, I can see the program
to lock up.

[nnorwitz]

Logged In: YES
user_id=33168

A similar problem to what?

Can you provide any more info or help debug this problem? I
don't have a windows box, so I can't begin to help with this.

[jpsc986hj]

Logged In: YES
user_id=1356401

Ooops - I make a typo

it should be

   eresult = se.readlines()
not 
    ersult = so.readlines()

[BreamoreBoy]

Any Cygwin/Windows people interested in this, or can it be closed?

[jpham]

last time I use - it is still a problem

[neologix]

It's not a bug.
so.readlines reads the subprocess' stdout until EOF is encountered, but in the meantime, if it writes a lot to stderr, the corresponding pipe fills up, and the subprocess blocks on the write.
You should use Popen's communicate method.

Closing as invalid.