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<h1>misc example code: multiprocess.py<a class="headerlink" href="#misc-example-code-multiprocess-py" title="Permalink to this headline">¶</a></h1>

[<a class="reference external" href="multiprocess.py">source code</a>]

<div class="highlight-default"><div class="highlight"><pre># -*- noplot -*-

# Demo of using multiprocessing for generating data in one process and plotting

# in another.

# Written by Robert Cimrman

from __future__ import print_function

import time

from multiprocessing import Process, Pipe

import numpy as np

import matplotlib

matplotlib.use('GtkAgg')

import matplotlib.pyplot as plt

import gobject

class ProcessPlotter(object):

def __init__(self):

self.x = []

self.y = []

def terminate(self):

plt.close('all')

def poll_draw(self):

def call_back():

while 1:

if not self.pipe.poll():

break

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__(self, pipe):

print('starting plotter...')

self.pipe = pipe

self.fig, self.ax = plt.subplots()

self.gid = gobject.timeout_add(1000, self.poll_draw())

print('...done')

plt.show()

class NBPlot(object):

def __init__(self):

self.plot_pipe, plotter_pipe = Pipe()

self.plotter = ProcessPlotter()

self.plot_process = Process(target=self.plotter,

args=(plotter_pipe,))

self.plot_process.daemon = True

self.plot_process.start()

def plot(self, finished=False):

send = self.plot_pipe.send

if finished:

send(None)

else:

data = np.random.random(2)

send(data)

def main():

pl = NBPlot()

for ii in range(10):

pl.plot()

time.sleep(0.5)

try:

input = raw_input

except NameError:

pass

input('press Enter...')

pl.plot(finished=True)

if __name__ == '__main__':

main()

</pre></div>

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