The multiprocessing module fails to build on Solaris 10 when using the 
Sun C compiler.  The failure is due to one missing symbol  
SEM_VALUE_MAX.

Defining that symbol (e.g. as _POSIX_SEM_VALUE_MAX) builds the 
_multiprocessing module for both 32- and 64-bit.

However, for 32-bit, 5 tests from test_multiprocessing fail due to the 
missing _ctypes module.  For 64-bit, the first 3 tests fail (like for 
32-bit) but the 4th test hangs.  Here is a log:

./python Lib/test/test_multiprocessing.py
test_array (__main__.WithProcessesTestArray) ... ERROR
test_getobj_getlock_obj (__main__.WithProcessesTestArray) ... ERROR
test_rawarray (__main__.WithProcessesTestArray) ... ERROR
test_notify (__main__.WithProcessesTestCondition) ... Process Process-1:
Traceback (most recent call last):
  File "/..../64/Python-2.6b1/Lib/multiprocessing/process.py", line 237, 
in _bootstrap
    self.run()
  File "/.../64/Python-2.6b1/Lib/multiprocessing/process.py", line 93, 
in run
    self._target(*self._args, **self._kwargs)
  File "Lib/test/test_multiprocessing.py", line 610, in f
    sleeping.release()
ValueError: semaphore or lock released too many times


This is Solaris 10 on an Ultra20 (Opteron) machine:

> uname -a
SunOS unknown 5.10 Generic_118855-14 i86pc i386 i86pc

> cc -v
cc: Sun C 5.8 2005/10/13