1
Creative Projects / Python Multiprocessing module issue
« on: February 14, 2010, 06:24:05 pm »
Having a problem with using multiprocessing in conjunction with libtcod
note: lots of commented out stuff from testing different approaches
edit:I'm assuming, from my limited knowledge of what's actually happening behind the scenes, that it's copying over the entire process, and thus, the libtcod console? edit2: quick look at some non-destructive sample code shows it opening 4 python.exe processes, so I'm going to guess that this is the issue.
note: lots of commented out stuff from testing different approaches
Code: [Select]
#!/usr/bin/env python
from multiprocessing import *
import time
import libtcodpy as libtcod
#actual size of the window
SCREEN_WIDTH = 46
SCREEN_HEIGHT = 20
#size of the map
MAP_WIDTH = 46
MAP_HEIGHT = 20
color_dark_wall = libtcod.Color(50, 50, 50)
color_dark_ground = libtcod.Color(150, 150, 150)
class Tile:
#a tile of the map and its properties
def __init__(self, blocked, block_sight = None):
self.blocked = blocked
self.clearance = 0
#by default, if a tile is blocked, it also blocks sight
if block_sight is None: block_sight = blocked
self.block_sight = block_sight
smap = ['##############################################',
'####################### #################',
'##################### # ###############',
'###################### ### ###########',
'################## ##### ####',
'################ ######## ###### ####',
'############### #################### ####',
'################ ###### ##',
'######## ####### ###### # # # ##',
'######## ###### ### ##',
'######## ##',
'#### ###### ### # # # ##',
'#### ### ########## #### ##',
'#### ### ########## ###########=##########',
'#### ################## ##### #####',
'#### ### #### ##### #####',
'#### # #### #####',
'######## # #### ##### #####',
'######## ##### ####################',
'##############################################',
]
def make_map():
global map
#fill map with "unblocked" tiles
map = [[ Tile(False)
for y in range(MAP_HEIGHT) ]
for x in range(MAP_WIDTH) ]
for y in range(MAP_HEIGHT):
for x in range(MAP_WIDTH):
if smap[y][x] == "#":
map[x][y].blocked = True
def render_all():
global color_light_wall
global color_light_ground
#go through all tiles, and set their background color
for y in range(MAP_HEIGHT):
for x in range(MAP_WIDTH):
wall = map[x][y].blocked
if wall:
libtcod.console_set_back(0, x, y, color_dark_wall, libtcod.BKGND_SET )
else:
libtcod.console_set_back(0, x, y, color_dark_ground, libtcod.BKGND_SET )
if map[x][y].clearance >= 1:
libtcod.console_put_char(0, x, y, str(map[x][y].clearance), libtcod.BKGND_NONE)
libtcod.console_set_custom_font('arial10x10.png', libtcod.FONT_TYPE_GREYSCALE | libtcod.FONT_LAYOUT_TCOD)
libtcod.console_init_root(SCREEN_WIDTH, SCREEN_HEIGHT, 'python/libtcod tutorial', False)
##class threadhandler(threading.Thread):
#### def __init__(self, thread, queue):
#### threading.thread.__init__(self)
#### self.thread = thread[0]
#### self.args = thread[1]
#### self.queue = queue
## def run(self):
## while True:
## task = pool.get()
## if task != None:
## thread = task[0]
## args = task[1]
## threading.Thread(target=thread, args=args).start()
## pool.task_done()
def make_clearance(x,y):
global map
incrementor = 0
if not map[x][y].blocked:
map[x][y].clearance = 1
incrementor += 1
increase = True
while increase == True:
for iy in range(y, (y + incrementor + 1)):
if map[x + incrementor][iy].blocked:
increase = False
for ix in range(x, (x + incrementor + 1)):
if map[ix][y + incrementor].blocked:
increase = False
if increase == True:
map[x][y].clearance += 1
incrementor += 1
else:
increase = False
incrementor = 0
#threading.Thread(target=your_function).start()
##class Collision(threading.Thread):
## def __init__(self, queue, x, y):
## threading.thread.__init__(self)
## self.queue = queue
## self.x = x
## self.y = y
##
## def run(self):
## global map
## incrementor = 0
## if not map[self.x][self.y].blocked:
## map[self.x][self.y].clearance = 1
## incrementor += 1
## increase = True
## while increase == True:
## for iy in range(self.y, (self.y + incrementor + 1)):
## if map[self.x + incrementor][iy].blocked:
## increase = False
## for ix in range(self.x, (self.x + incrementor + 1)):
## if map[ix][self.y + incrementor].blocked:
## increase = False
## if increase == True:
## map[self.x][self.y].clearance += 1
## incrementor += 1
## else:
## increase = False
## incrementor = 0
#original function, the ix/iy loops are for checked the new edges every time you expand the square
##def make_collision():
## global map
## incrementor = 0
## for y in range(MAP_HEIGHT):
## for x in range(MAP_WIDTH):
## if not map[x][y].blocked:
## map[x][y].clearance = 1
## incrementor += 1
## increase = True
## while increase == True:
## for iy in range(y, (y + incrementor + 1)):
## if map[x + incrementor][iy].blocked:
## increase = False
## for ix in range(x, (x + incrementor + 1)):
## if map[ix][y + incrementor].blocked:
## increase = False
## if increase == True:
## map[x][y].clearance += 1
## incrementor += 1
## else:
## increase = False
## incrementor = 0
#generate map (at this point it's not drawn to the screen)
make_map()
##pool = Queue.Queue()
pool = Pool(processes = 4)
##if not libtcod.console_is_window_closed():
if __name__ == '__main__':
start = time.time() # timing test for later, ignore.
## for x in range(4):
## threadhandler().start()
## for y in range(MAP_HEIGHT):
## for x in range(MAP_WIDTH):
## pool.put((make_clearance,(x,y)))
## pool.join()
for y in range(MAP_HEIGHT):
for x in range(MAP_WIDTH):
pool.apply_async(make_clearance, (x,y))
print "Elapsed Time: %s" %(time.time() - start)
#render the screen
render_all()
libtcod.console_flush()
key = libtcod.console_wait_for_keypress(True)The issue is, when I try it run it, as far as I can tell, it attempts to open a new libtcod window for every single iteration of make_clearance. Would be greatly appreciated if someone could point out what stupid little thing I've screwed up :< edit2: So, the question becomes- How the ehll do I fix this? edit:I'm assuming, from my limited knowledge of what's actually happening behind the scenes, that it's copying over the entire process, and thus, the libtcod console? edit2: quick look at some non-destructive sample code shows it opening 4 python.exe processes, so I'm going to guess that this is the issue.
