python 2.7.1 HP-UX 11 ia64 built not supporting thread

Wong Wah Meng-R32813 r32813 at
Wed Sep 28 12:14:08 CEST 2011

Hello there,

I included --with-threads option into the configure script calling, which it failed to add the -D_REENTRANT into Makefile. So I manually added this into OPT of the Makefile. I ran make again and generated a new python binary. However, the new binary is still not able to start a new thread from the thread module. 

I reviewed the config.log file, I think this failure has caused the build with threads failed. Cthreads.h header file is missing. Should this be included in my HP UX Compiler or it comes from python source? In python source I only found pythread.h. Anyway, I am only guessing what is wrong. 

Hope to hear some feedback here, whether this is something missing or a bug. 

configure:8407: checking for --with-threads
configure:8427: result: yes
configure:8484: checking for _POSIX_THREADS in unistd.h
configure:8503: result: yes
configure:8508: checking cthreads.h usability
configure:8508: cc +DD64 -I/home/r32813/local/include -c -g  conftest.c >&5
"conftest.c", line 128: error #3696-D: cannot open source file "cthreads.h"
  #include <cthreads.h>
1 error detected in the compilation of "conftest.c".

| #define HAVE_LIBDLD 1
| #define _REENTRANT 1
| /* end confdefs.h.  */
| #include <cthreads.h>
configure:8508: result: no
configure:8508: checking for cthreads.h
configure:8508: result: no
configure:8521: checking mach/cthreads.h usability
configure:8521: cc +DD64 -I/home/r32813/local/include -c -g  conftest.c >&5
"conftest.c", line 128: error #3696-D: cannot open source file "mach/cthreads.h"
  #include <mach/cthreads.h>

1 error detected in the compilation of "conftest.c".
configure:8521: $? = 2
configure: failed program was:
| /* confdefs.h */
| #define _GNU_SOURCE 1

| #define HAVE_LIBDLD 1
| #define _REENTRANT 1
| /* end confdefs.h.  */
| #include <mach/cthreads.h>
configure:8521: result: no
configure:8521: checking for mach/cthreads.h
configure:8521: result: no
configure:8533: checking for --with-pth
configure:8548: result: no
configure:8556: checking for pthread_create in -lpthread
configure:8572: cc +DD64 -I/home/r32813/local/include -o conftest -g  -L/home/r32813/local/lib -L/home/r32813/Build/2.7.1/Python-2.7.1 conftest.c -l
nsl -lrt -ldld -ldl  -lpthread >&5

Wah Meng
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-----Original Message-----
From: Wong Wah Meng-R32813 
Sent: Wednesday, September 28, 2011 4:37 PM
To: python-list at
Subject: python 2.7.1 built not supporting thread? 

Hello there,

I couldn't detect this problem until I run my application that utilizes thread module in python that I just built on HP-UX 11.31 ia64 using aCC.

Could it be the build did not include enable thread option? _REENTRANT as stated in the README file? If yes, it looks like threading may not work "out of the box". 

>>> thread.start_new_thread(testing, ())
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
thread.error: can't start new thread

Excerpts from README file for python 2.7 build

HP-UX:  When using threading, you may have to add -D_REENTRANT to the
        OPT variable in the top-level Makefile; reported by Pat Knight,
        this seems to make a difference (at least for HP-UX 10.20)
        even though pyconfig.h defines it. This seems unnecessary when
        using HP/UX 11 and later - threading seems to work "out of the


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