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1 #!/usr/bin/python
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2
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3 # Orthanc - A Lightweight, RESTful DICOM Store
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4 # Copyright (C) 2012-2015 Sebastien Jodogne, Medical Physics
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5 # Department, University Hospital of Liege, Belgium
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6 #
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7 # This program is free software: you can redistribute it and/or
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8 # modify it under the terms of the GNU General Public License as
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9 # published by the Free Software Foundation, either version 3 of the
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10 # License, or (at your option) any later version.
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11 #
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12 # This program is distributed in the hope that it will be useful, but
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13 # WITHOUT ANY WARRANTY; without even the implied warranty of
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14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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15 # General Public License for more details.
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16 #
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17 # You should have received a copy of the GNU General Public License
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18 # along with this program. If not, see <http://www.gnu.org/licenses/>.
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19
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20
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21 import os
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22 import signal
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23 import subprocess
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24 import threading
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25
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26 class ExternalCommandThread:
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27 @staticmethod
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28 def ExternalCommandFunction(arg, stop_event, command, env):
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29 external = subprocess.Popen(command, env = env)
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30
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31 while (not stop_event.is_set()):
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32 error = external.poll()
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33 if error != None:
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34 # http://stackoverflow.com/a/1489838/881731
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35 os._exit(-1)
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36 stop_event.wait(0.1)
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37
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38 print 'Stopping the external command'
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39 external.terminate()
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40
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41 def __init__(self, command, env = None):
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42 self.thread_stop = threading.Event()
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43 self.thread = threading.Thread(target = self.ExternalCommandFunction,
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44 args = (10, self.thread_stop, command, env))
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45 self.daemon = True
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46 self.thread.start()
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47
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48 def stop(self):
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49 self.thread_stop.set()
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50 self.thread.join()
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