Python multiprocessing sharedctype array - cant write -


for testing reasons start 1 process. 1 given argument array shall changed process.

class engine(): ready = value('i', false)  def movelisttoctypemovelist(self, movelist):     ctml = []     zug in movelist:         ctzug = ctypezug()         ctzug.vonreihe = zug.vonreihe         ctzug.vonlinie = zug.vonlinie         ctzug.nachreihe = zug.nachreihe         ctzug.nachlinie = zug.nachlinie         ctzug.bewertung = zug.bewertung         ctml.append(ctzug)     return ctml  def findbestmove(self, board, settings, enginesettings):     print ("computer using", multiprocessing.cpu_count(),"cores.")     movelist = array(ctypezug, [], lock = true)     movelist = self.movelisttoctypemovelist(board.movelist)     bd = board.boardtodictionary()     process = []     in range(1):         p = process(target=self.calculatenullmoves, args=(bd, movelist, i, self.ready))         process.append(p)         p.start()     p in process:         p.join()     self.printctypemovelist(movelist, settings)     print ("ready:", self.ready.value)  def calculatenullmoves(self, boarddictionary, ml, processindex, ready):     currenttime = time()     print ("process", processindex, "begins work...")     board = board()     board.dictionarytoboard(boarddictionary)     ...     ml[processindex].bewertung = 2.4     ready.value = true     print ("process", processindex, "finished work in", time()-currenttime, "sec")  def printctypemovelist(self, ml):     zug in ml:         print (zug.vonreihe, zug.vonlinie, zug.nachreihe, zug.nachlinie, zug.bewertung)

i try write 2.4 directly in list, no changing shown when calling "printctypemovelist". set "ready" true , works. used information http://docs.python.org/2/library/multiprocessing.html#module-multiprocessing.sharedctypes

i hope can find mistake, if difficult read, please let me know.

the problem you're trying share plain python list:

ctml = []

use proxy object instead:

from multiprocessing import manager ctml = manager().list()

see python doc on sharing state between processes more detail.


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