Mercurial > cpython-lru_cache-weakref

annotate Lib/lib-stdwin/WindowSched.py @ 5817:48b94de85bf3 legacy-trunk

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Extensive changes by AMK.
author Guido van Rossum <guido@python.org>
date Thu, 17 Jul 1997 16:29:42 +0000
parents 2dd285794d67
children
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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 msecs = int(msecs)
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15 #
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16 # Check for immediate stdwin event
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17 #
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18 event = stdwinq.pollevent()
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19 if event:
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20 mainloop.dispatch(event)
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21 return
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22 #
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23 # Use sleep for very short delays or if there are no windows
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24 #
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25 if msecs < 100 or mainloop.countwindows() == 0:
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26 if msecs > 0:
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27 time.sleep(msecs * 0.001)
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28 return
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29 #
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30 # Post a timer event on an arbitrary window and wait for it
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31 #
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32 window = mainloop.anywindow()
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33 window.settimer(msecs/100)
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34 event = stdwinq.getevent()
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35 window.settimer(0)
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36 if event[0] <> WE_TIMER:
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37 mainloop.dispatch(event)
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38
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39 def millitimer():
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40 return time.time() * 1000
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42 q = sched.scheduler(millitimer, delayfunc)
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44 # Export functions enter, enterabs and cancel just like a scheduler
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45 #
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46 enter = q.enter
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47 enterabs = q.enterabs
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48 cancel = q.cancel
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49
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50 # Emptiness check must check both queues
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51 #
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52 def empty():
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53 return q.empty() and mainloop.countwindows() == 0
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54
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55 # Run until there is nothing left to do
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56 #
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57 def run():
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58 while not empty():
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59 if q.empty():
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60 mainloop.dispatch(stdwinq.getevent())
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61 else:
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62 q.run()