Anomaly in time.clock()

[Gabriel Genellina]

On 20 mar, 08:47, Godzilla <godzillais... at gmail.com> wrote:

> Thanks Ross and John for your help. I apologise for the code I posted
> earlier not being the full picture of what I was trying to achieve. I
> had instantiated multiple instances of elapseTime class and each of
> them gets called approximately the same time. Below is the updated
> code:

You still have race conditions:

>     def setTime(self, state):
>       if state == 1:
>         self.checkTimeFlag = True
>         self.timeStamp = time.clock()
>       else:
>         self.checkTimeFlag = False
>
>     def elapsedTime(self):
>       prevTime = time.clock()
>       while True:
>         curTime = time.clock()
>         timeDiff = (curTime - prevTime)
>         if timeDiff < 0.0:
>           printq.put_nowait('time.clock() has gone backward!!! Time
> Diff '+str(timeDiff))
>         if self.checkTimeFlag:
>           if (curTime - self.timeStamp) > 1.0:
>             printq.put_nowait(self.name+", actual Elapsed
> Time"+str(round(curTime-self.timeStamp, 3)))
>             self.checkTimeFlag = False
>         prevTime = curTime
>         time.sleep(0.05)

Both functions run on different threads, use self.checkTimeFlag and
self.timeStamp.
By example, setTime sets self.checkTimeFlag = True before
self.timeStamp; the other thread can use and old value for
self.timeStamp.

--
Gabriel Genellina