Tom Brown wrote:
> Hey people,
>
> I've written a python app that r/w eight serial ports to control eight
> devices
> using eight threads. This all works very nicely in Linux. I even put a GUI on
> it using PyQt4. Still works nicely.
>
> Then I put the app on on a virtual Windows machine running inside of vmware
> on
> the same Linux box. Vmware only lets me have four serial ports so I run the
> app against four serial ports using four threads. The app did not respond
> quick enough to data from the serial ports and eventually hung.
>
> So, I tried one serial port and the app still did not respond quick enough to
> the single serial port. It eventually hangs.
>
> When the app hung, in each case, it was not hogging the cpu nor reading any
> data off the serial ports. The task manager didn't show it was doing anything
> at all.
>
> When it runs on Windows, could it be:
>
> 1) Just struggling to run inside of VMware?
>
> 2) Using threads with Qt on Windows is a problem?
>
> 3) Threads in python on Windows is a problem?
>
> Any ideas?
>
> Thanks,
> Tom
Hi,
I have been using wxpython myself with pyserial in Windows 2000/XP.
No problems. Below are (edited) code segments. The "self.jam" is
used for stopping serial port processing without stopping the thread.
-------- thread example starts --------------------
class T1Thread(Thread):
def __init__(self, inport):
Thread.__init__(self)
self._want_abort = 0
self.inprt = inport # COMx
self.inprt.flushInput()
self.run_count = 0
#
self.jam = false
#
self.start()
def run(self):
while self._want_abort == 0:
if not self.jam:
self.read_simulations()
sleep(1)
def abort(self):
self._want_abort = 1 # Stop from GUI
def read_simulations(self):
..blah..blah..
self.inprt.flushInput()
sleep(5)
-------- thread example ends --------------------
-------- Wxpython code starts --------------------
def OnRun(self, event):
if self.in_port != "No" and not self.T1worker:
self.T1worker = T1Thread(self.inprt)
if self.out_port != "No" and not self.T2worker:
self.T2worker = T2Thread(self.outprt)
if self.in2_port != "No" and not self.T3worker:
self.T3worker = T3Thread(self.in2prt)
def OnStop(self, event):
if self.T1worker:
self.T1worker.abort()
if self.T2worker:
self.T2worker.abort()
if self.T3worker:
self.T3worker.abort()
sleep(3)
self.T1worker= None
self.T2worker= None
self.T3worker= None
print "\nSTOPPED\n"
-------- Wxpython code ends --------------------
-pekka-
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