Mercurial > cpython-lru_cache-weakref

annotate Lib/stdwin/WindowSched.py @ 4566:6403c94de50d legacy-trunk

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Added safeguard against failure in __del__.
author Guido van Rossum <guido@python.org>
date Wed, 27 Nov 1996 19:39:58 +0000
parents 1940892d2fe3
children 2dd285794d67
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1 # Combine a real-time scheduling queue and stdwin event handling.
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2 # Keeps times in milliseconds.
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3
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4 import stdwin, stdwinq
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5 from stdwinevents import WE_TIMER
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6 import mainloop
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7 import sched
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8 import time
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9
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10 # Delay function called by the scheduler when it has nothing to do.
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11 # Return immediately when something is done, or when the delay is up.
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12 #
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13 def delayfunc(msecs):
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14 #
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15 # Check for immediate stdwin event
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16 #
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17 event = stdwinq.pollevent()
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18 if event:
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19 mainloop.dispatch(event)
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20 return
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21 #
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22 # Use sleep for very short delays or if there are no windows
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23 #
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24 if msecs < 100 or mainloop.countwindows() == 0:
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25 if msecs > 0:
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26 time.sleep(msecs * 0.001)
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27 return
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28 #
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29 # Post a timer event on an arbitrary window and wait for it
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30 #
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31 window = mainloop.anywindow()
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32 window.settimer(msecs/100)
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33 event = stdwinq.getevent()
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34 window.settimer(0)
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35 if event[0] <> WE_TIMER:
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36 mainloop.dispatch(event)
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37
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38 def millitimer():
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39 return int(1000 * time.time())
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40
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41 q = sched.scheduler(millitimer, delayfunc)
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42
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43 # Export functions enter, enterabs and cancel just like a scheduler
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44 #
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45 enter = q.enter
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46 enterabs = q.enterabs
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47 cancel = q.cancel
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48
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49 # Emptiness check must check both queues
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50 #
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51 def empty():
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52 return q.empty() and mainloop.countwindows() == 0
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54 # Run until there is nothing left to do
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55 #
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56 def run():
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57 while not empty():
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58 if q.empty():
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59 mainloop.dispatch(stdwinq.getevent())
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60 else:
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61 q.run()