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Thanks to Rob Collins (implementer) and Greg Smith (profiler), Cygwin now
provides enough pthreads support so that Cygwin Python builds OOTB *and*
functions reasonably well even with threads enabled. Unfortunately,
there are still a few issues that need to be resolved.
The one that I would like to address in this posting prevents a threaded
Cygwin Python from building the standard extension modules (without some
kind of intervention). :,( Specifically, the build would frequently
hang during the Distutils part when Cygwin Python is attempting to execvp
a gcc process.
See the first attachment, test.py, for a minimal Python script that
exhibits the hang. See the second attachment, test.c, for a rewrite
of test.py in C. Since test.c did not hang, I was able to conclude that
this was not just a straight Cygwin problem.
Further tracing uncovered that the hang occurs in _execvpe() (in os.py),
when the child tries to import tempfile. If I apply the third attachment,
os.py.patch, then the hang is avoided. Hence, it appears that importing a
module (or specifically the tempfile module) in a threaded Cygwin Python
child cause a hang.
I saw the following comment in _execvpe():
# Process handling (fork, wait) under BeOS (up to 5.0)
# doesn't interoperate reliably with the thread interlocking
# that happens during an import. The actual error we need
# is the same on BeOS for posix.open() et al., ENOENT.
The above makes me think that possibly Cygwin is having a similar problem.
Can anyone offer suggestions on how to further debug this problem?
Thanks,
Jason
--
Jason Tishler
Director, Software Engineering Phone: 732.264.8770 x235
Dot Hill Systems Corp. Fax: 732.264.8798
82 Bethany Road, Suite 7 Email: Jason.Tishler@dothill.com
Hazlet, NJ 07730 USA WWW: http://www.dothill.com
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import os
cmd = ['ls', '-l']
pid = os.fork()
if pid == 0:
print 'child execvp-ing'
os.execvp(cmd[0], cmd)
else:
(pid, status) = os.waitpid(pid, 0)
print 'status =', status
print 'parent done'
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#include <unistd.h>
#include <sys/wait.h>
char* const cmd[] = {"ls", "-l", 0};
int
main()
{
int status;
pid_t pid = fork();
if (pid == 0)
{
printf("child execvp-ing\n");
execvp(cmd[0], cmd);
}
else
{
waitpid(pid, &status, 0);
printf("status = %d\n", status);
printf("parent done\n");
}
}
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--- os.py.orig Thu Jun 28 16:14:28 2001
+++ os.py Thu Jun 28 16:30:12 2001
@@ -329,8 +329,9 @@ def _execvpe(file, args, env=None):
try: unlink('/_#.# ## #.#')
except error, _notfound: pass
else:
- import tempfile
- t = tempfile.mktemp()
+ #import tempfile
+ #t = tempfile.mktemp()
+ t = '/mnt/c/TEMP/@279.3'
# Exec a file that is guaranteed not to exist
try: execv(t, ('blah',))
except error, _notfound: pass
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