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test_multiprocessing is also still hanging for me, perhaps 30% of the 
times I run the test suite.
When running the test by itself it seems to pass much more often, but 
not always. I just got the following output (on OS X 10.5.3/Intel).
There was a hang at test_get; after around half-an-hour I hit Ctrl-C.
Macintosh-3:trunk dickinsm$ ./python.exe 
Lib/test/test_multiprocessing.py
test_array (__main__.WithProcessesTestArray) ... ok
test_getobj_getlock_obj (__main__.WithProcessesTestArray) ... ok
test_rawarray (__main__.WithProcessesTestArray) ... ok
test_notify (__main__.WithProcessesTestCondition) ... ok
test_notify_all (__main__.WithProcessesTestCondition) ... ok
test_timeout (__main__.WithProcessesTestCondition) ... ok
test_connection (__main__.WithProcessesTestConnection) ... ok
test_duplex_false (__main__.WithProcessesTestConnection) ... ok
test_sendbytes (__main__.WithProcessesTestConnection) ... ok
test_spawn_close (__main__.WithProcessesTestConnection) ... ok
test_event (__main__.WithProcessesTestEvent) ... ok
test_finalize (__main__.WithProcessesTestFinalize) ... ok
test_heap (__main__.WithProcessesTestHeap) ... ok
test_import (__main__.WithProcessesTestImportStar) ... ok
test_lock (__main__.WithProcessesTestLock) ... ok
test_rlock (__main__.WithProcessesTestLock) ... ok
test_enable_logging (__main__.WithProcessesTestLogging) ... ok
test_level (__main__.WithProcessesTestLogging) ... ok
test_active_children (__main__.WithProcessesTestProcess) ... ok
test_cpu_count (__main__.WithProcessesTestProcess) ... ok
test_current (__main__.WithProcessesTestProcess) ... ok
test_process (__main__.WithProcessesTestProcess) ... ok
test_recursion (__main__.WithProcessesTestProcess) ... ok
test_terminate (__main__.WithProcessesTestProcess) ... ok
test_fork (__main__.WithProcessesTestQueue) ... ok
test_get (__main__.WithProcessesTestQueue) ... ^CTraceback (most recent 
call last):
 File "Lib/test/test_multiprocessing.py", line 1799, in <module>
main()
 File "Lib/test/test_multiprocessing.py", line 1796, in main
test_main(unittest.TextTestRunner(verbosity=2).run)
 File "Lib/test/test_multiprocessing.py", line 1786, in test_main
run(suite)
 File "/Users/dickinsm/python_source/trunk/Lib/unittest.py", line 743, 
in run
test(result)
 File "/Users/dickinsm/python_source/trunk/Lib/unittest.py", line 454, 
in __call__
return self.run(*args, **kwds)
 File "/Users/dickinsm/python_source/trunk/Lib/unittest.py", line 450, 
in run
test(result)
 File "/Users/dickinsm/python_source/trunk/Lib/unittest.py", line 454, 
in __call__
return self.run(*args, **kwds)
 File "/Users/dickinsm/python_source/trunk/Lib/unittest.py", line 450, 
in run
test(result)
 File "/Users/dickinsm/python_source/trunk/Lib/unittest.py", line 293, 
in __call__
return self.run(*args, **kwds)
 File "/Users/dickinsm/python_source/trunk/Lib/unittest.py", line 272, 
in run
testMethod()
 File "Lib/test/test_multiprocessing.py", line 415, in test_get
parent_can_continue.wait()
 File 
"/Users/dickinsm/python_source/trunk/Lib/multiprocessing/synchronize.py"
, line 292, in wait
self._cond.wait(timeout)
 File 
"/Users/dickinsm/python_source/trunk/Lib/multiprocessing/synchronize.py"
, line 201, in wait
self._wait_semaphore.acquire(True, timeout)
KeyboardInterrupt
[50284 refs]
Macintosh-3:trunk dickinsm$