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Minor update to multiprocessing example. #10168

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merged 1 commit into from
Jan 19, 2018
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Minor update to multiprocessing example. #10168

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38 changes: 20 additions & 18 deletions examples/misc/multiprocess_sgskip.py
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Original file line number Diff line number Diff line change
Expand Up @@ -19,7 +19,13 @@
# Uncomment the following lines to use the qt5 backend instead.
#
# import matplotlib
# matplotlib.use('qt5Agg')
# matplotlib.use('qt5agg')
#
# Alternatively, with Python 3.4+ you may add the line
#
# import multiprocessing as mp; mp.set_start_method("forkserver")
#
# immediately after the ``if __name__ == "__main__"`` check.

import matplotlib.pyplot as plt

Expand All @@ -43,30 +49,26 @@ def __init__(self):
def terminate(self):
plt.close('all')

def poll_draw(self):
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Huh, what was the point of this? Some kind of closure effect?

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not sure, but AFAICT it works without it...


def call_back():
while self.pipe.poll():
command = self.pipe.recv()
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')
self.fig.canvas.draw()
return True

return call_back
def call_back(self):
while self.pipe.poll():
command = self.pipe.recv()
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')
self.fig.canvas.draw()
return True

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

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

print('...done')
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