Date: Wed, 10 Nov 2010 23:21:17 +0200 From: David Naylor <naylor.b.david@gmail.com> To: freebsd-hackers@freebsd.org Subject: python + build ports = failure (threading problem) Message-ID: <201011102321.23883.naylor.b.david@gmail.com>
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Hi,
I've found a problem in FreeBSD's implementation for threads, pth does not=
=20
have this problem. =20
The following test case consistantly reproduces the problem:
=2D-- start ---
#! /usr/bin/env python
from subprocess import Popen, PIPE
from threading import Lock, Thread
def runner():
process =3D Popen(("make", "-C", "/usr/ports/graphics/kdegraphics4", "cle=
an",=20
"all"), close_fds=3DTrue)
process.wait()
# If runner called directly then port compiles correctly, otherwise it stal=
ls
Thread(target=3Drunner).start()
=2D-- end ---
The port stalls with=20
<snip/>
grep: writing output: Broken pipe
grep: writing output: Broken pipe
grep: writing output: Broken pipe
- found
=3D=3D=3D> Configuring for kdegraphics-4.5.3
/bin/mkdir -p /usr/ports/graphics/kdegraphics4/work/kdegraphics-4.5.3/build
<end/>
The grep errors appear to be mostly harmless, `ps` shows:
<snip/>
17648 4 D 0:00.03 python test.py
17649 4 D 0:00.08 make -C /usr/ports/graphics/kdegraphics4 clean all
17974 4 D 0:00.03 [cmake]
17978 4 Z 0:00.03 <defunct>
<snip/>
I suspect any port using cmake will have this problem (unconfirmed) and if=
=20
memory serves me correct then building lang/perl causes the same problem=20
(although the stall happens much later on in the build). =20
Using WITH_PTH when building python fixes the problem so I suspect libthr a=
s=20
the cause of the problem. =20
I hope someone finds this information useful. =20
David
P.S. Should a PR be filed for this?
P.S.S. It is possible that one of pythons test cases can reproduce this...
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