[issue1336] subprocess.Popen hangs when child writes to stderr

[john doe]

john doe tnagy1...@gmail.com added the comment:

The following piece of code does not seem to be thread-safe:

gc.disable()
try:
os.fork()
except:
...

If calling subprocess.Popen() is supposed to work from threads without any 
particular protection, then a lock is needed in subprocess.py:

try:
   spawn_lock.acquire()
   gc.disable()
   try:
   os.fork()
   except:
   ...
finally:
   spawn_lock.release()

Such issues are very difficult to reproduce and to track. The documentation 
should at least mention that calling gc.enable() may cause subprocess() to hang!

The following issue seems to be relevant: http://bugs.python.org/issue12739

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[issue8728] 2.7 regression in httplib.py: AttributeError: 'NoneType' object has no attribute 'makefile'

[John Doe]

Changes by John Doe gainmax...@gmail.com:


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