[issue31935] subprocess.run() timeout not working with grandchildren and stdout=PIPE

New submission from Martin Ritter : Hi, I tried to use subprocess.run(..., stdout=subprocess.PIPE, timeout=N) to run some test scripts with a given timeout. This works as expected with simple scripts. However if the script itself creates other children which write to stdout then

[issue27422] Deadlock when mixing threading and multiprocessing

Martin Ritter added the comment: Dear Davin, Thanks for the input, I was perfectly aware that the "solution" I proposed is not realistic. But the feedback that multiprocessing is using threads internally is useful as I can quickly abandon the idea to do something like the check

[issue27422] Deadlock when mixing threading and multiprocessing

Martin Ritter added the comment: I agree that this is error prone and can not be fixed reliably on the python side. However, python makes it very easy to mix these two, a user might not even notice it if a function he calls uses fork and thus just use a ThreadPoolExecutor() because it'

[issue23644] g++ module compile fails with ‘_Atomic’ does not name a type

Martin Ritter added the comment: For me compiling 3.5.2 on GCC 5.2.0 fails when I supply --with-cxx-main=g++ with the same "error: ‘_Atomic’ does not name a type" messages. I'm guessing that --with-cxx-main is probably outdated(?) but at least it worked with 3.5.0 -----

[issue27422] Deadlock when mixing threading and multiprocessing

Martin Ritter added the comment: I attached a gdb backtrace of one of the child processes -- Added file: http://bugs.python.org/file43589/test_threadfork_backtrace.txt ___ Python tracker <http://bugs.python.org/issue27

[issue27422] Deadlock when mixing threading and multiprocessing

New submission from Martin Ritter: When creating a multiprocessing.Process in a threaded environment I get deadlocks waiting, I guess waiting for the lock to flush the output. I attached a minimal example of the problem which hangs for me starting with 4 threads. -- files