Hi, I've found a problem in FreeBSD's implementation for threads, pth does not have this problem.
The following test case consistantly reproduces the problem:
--- start ---
#! /usr/bin/env python
from subprocess import Popen, PIPE
from threading import Lock, Thread
def runner():
process = Popen(("make", "-C", "/usr/ports/graphics/kdegraphics4", "clean",
"all"), close_fds=True)
process.wait()
# If runner called directly then port compiles correctly, otherwise it stalls
Thread(target=runner).start()
--- end ---
The port stalls with
<snip/>
grep: writing output: Broken pipe
grep: writing output: Broken pipe
grep: writing output: Broken pipe
- found
===> 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
memory serves me correct then building lang/perl causes the same problem
(although the stall happens much later on in the build).
Using WITH_PTH when building python fixes the problem so I suspect libthr as
the cause of the problem.
I hope someone finds this information useful.
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...
signature.asc
Description: This is a digitally signed message part.
