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Update multiprocess.py #6637

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Thomas00010111 Jun 23, 2016
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52 changes: 29 additions & 23 deletions examples/misc/multiprocess.py
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Original file line number Diff line number Diff line change
Expand Up @@ -6,11 +6,12 @@
import time
from multiprocessing import Process, Pipe
import numpy as np

import matplotlib
matplotlib.use('GtkAgg')
# not all backends may allow safe plotting from multiple threads
# you can select a specific backend by uncommenting the line below
# and update the selected backend as needed
# matplotlib.use('QT5Agg')
import matplotlib.pyplot as plt
import gobject


class ProcessPlotter(object):
Expand All @@ -21,35 +22,33 @@ def __init__(self):
def terminate(self):
plt.close('all')

def poll_draw(self):

def call_back():
while 1:
if not self.pipe.poll():
break
def call_back(self):
while True:
if not self.pipe.poll():
break

command = self.pipe.recv()
command = self.pipe.recv()

if command is None:
self.terminate()
return False
if command is None:
self.terminate()
return False

else:
self.x.append(command[0])
self.y.append(command[1])
self.ax.plot(self.x, self.y, 'ro')
else:
self.x.append(command[0])
self.y.append(command[1])
self.ax.plot(self.x, self.y, 'ro')

self.fig.canvas.draw()
return True

return call_back
self.fig.canvas.draw_idle()
return True

def __call__(self, pipe):
print('starting plotter...')

self.pipe = pipe
self.fig, self.ax = plt.subplots()
self.gid = gobject.timeout_add(1000, self.poll_draw())
timer = self.fig.canvas.new_timer(interval=1000)
timer.add_callback(self.call_back)
timer.start()

print('...done')
plt.show()
Expand Down Expand Up @@ -78,8 +77,15 @@ def main():
for ii in range(10):
pl.plot()
time.sleep(0.5)
raw_input('press Enter...')

pl.plot(finished=True)

if __name__ == '__main__':
# The default way to start a process on OSX ('fork')
# does not work well with many gui frameworks on OSX
# if you use Python 3.4 or later you can uncomment the
# two lines below to change the default start to
# forkserver.
# import multiprocessing as mp
# mp.set_start_method('forkserver')
main()