To solve the problem, you need do a dummy call of strptime before start
a thread.

#dummy call
datetime.strptime('2012-01-01', '%Y-%m-%d') 
#start thread
task_thread = threading.Thread(target=self._run_job, name=job['name'], 
args=(task_cr, job, now))  

This is a python bug, strptime dont work fine with threading, all that
explain on python bug report.

The only one impact is :  No more crash.  the dummy call not stored in
any variable, this only initialise the datetime.strptime.

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https://bugs.launchpad.net/bugs/947231

Title:
  ImportError: Failed to import _strptime because the import lockis held
  by another thread.

Status in OpenERP Server:
  Confirmed

Bug description:
  2012-03-05 16:05:20,044 7205 DEBUG ? openerp.cron: Database 'tl61_test_uos' 
wake-up! Firing multi-threaded cron job processing
  2012-03-05 16:05:20,049 7205 DEBUG ? openerp.addons.base.ir.ir_cron: Cron 
execution thread for job `Run Event Reminder` spawned
  2012-03-05 16:05:20,050 7205 WARNING ? openerp.addons.base.ir.ir_cron: 
Exception in cron:
  Traceback (most recent call last):
    File 
"/srv/openerp/instances/61XA/src/server/openerp/addons/base/ir/ir_cron.py", 
line 254, in _run_jobs_multithread
      next_call = calendar.timegm(time.strptime(next_call, 
DEFAULT_SERVER_DATETIME_FORMAT))
  ImportError: Failed to import _strptime because the import lockis held by 
another thread.
  2012-03-05 16:05:20,051 7205 DEBUG ? openerp.cron: Going to sleep for 60s

  is this a warning or a real error?

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