Hello, friends!
Here is my sample code, which works perfectly on other systems, but not 
the FreeBSD 4.10-STABLE I got today by cvsupping.

#!/usr/local/bin/python
from threading import Thread
class Reading(Thread):
 def __init__(self):
  Thread.__init__(self)
 def run(self):
  print "Start!"
  z = 1
  while 1:
   print z
   z += 1
   fl = open('blah.txt')
   fl.read()
   fl.close()

for i in range(10):
 print "i:", i
 zu = open('bzzz.txt')
 print "|->", zu.read()
 bzz = Reading()
 bzz.start()
#---
I have tested this on Python 2.3.3, 2.3.4 and 2.4a0 from CVS.
The interpretar falls in the infinite loop and stays in the poll-state.
You can see it in the top:
34446 goga        2   0  3328K  2576K poll     0:00  0.00%  0.00% python

I think it has some connection to the latest bug, found in the select() 
function (http://www.securityfocus.com/bid/10455) and its fix on BSD.

Best regards,
_Iww_

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Indentation was lost on your example.  Please attach it it
to the bug report as a file instead.

In my opinion, the problem you're having is unlikely to be
related to the securityfocus URL you mentioned.

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iww, is this a FreeBSD bug?  Does the problem still exist?

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nnorwitz, thank you for your attantion!
It was really a short problem in FreeBSD sources. The last version of python did
not worked well.
The bug was solved shortly after my post.

Best regards,
_Iww_

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Closing then.