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#
# Title: Provides ParallelExec to execute commands in
# other (background or parallel) threads.
# Author: Pearu Peteson <pearu@cens.ioc.ee>
# Created: October, 2003
#
__all__ = ['ParallelExec']
import sys
import threading
import Queue
import traceback
class ParallelExec(threading.Thread):
""" Create a thread of parallel execution.
"""
def __init__(self):
threading.Thread.__init__(self)
self.__queue = Queue.Queue(0)
self.__frame = sys._getframe(1)
self.setDaemon(1)
self.start()
def __call__(self,code,frame=None,wait=0):
""" Execute code in parallel thread inside given frame (default
frame is where this instance was created).
If wait is True then __call__ returns after code is executed,
otherwise code execution happens in background.
"""
if wait:
wait_for_code = threading.Event()
else:
wait_for_code = None
self.__queue.put((code,frame,wait_for_code))
if wait:
wait_for_code.wait()
def shutdown(self):
""" Shutdown parallel thread."""
self.__queue.put((None,None,None))
def run(self):
""" Called by threading.Thread."""
while 1:
code, frame, wait_for_code = self.__queue.get()
if code is None:
break
if frame is None:
frame = self.__frame
try:
exec (code, frame.f_globals,frame.f_locals)
except Exception:
try:
traceback.print_exc()
except AttributeError:
pass
if wait_for_code is not None:
wait_for_code.set()
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