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'''
====================================================================
Copyright (c) 2003-2006 Barry A Scott. All rights reserved.
This software is licensed as described in the file LICENSE.txt,
which you should have received as part of this distribution.
====================================================================
wb_background_thread.py
'''
import threading
class BackgroundThread(threading.Thread):
def __init__( self ):
threading.Thread.__init__( self )
self.setDaemon( 1 )
self.running = 1
self.work_queue = []
self.queue_lock = threading.Lock()
self.queued_work_semaphore = threading.Semaphore( 0 )
def run( self ):
while self.running:
# wait for work
self.queued_work_semaphore.acquire()
# dequeue
self.queue_lock.acquire()
function = self.work_queue.pop( 0 )
self.queue_lock.release()
# run the function
function()
print 'BackgroundThread.run() shutdown'
def addWork( self, function ):
# queue the function
self.queue_lock.acquire()
self.work_queue.append( function )
self.queue_lock.release()
# count one more piece of work
self.queued_work_semaphore.release()
def shutdown( self ):
self.addWork( self.__shutdown )
def __shutdown( self ):
self.running = 0
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