Experimental Physics and
Industrial Control System

Noboru Yamamoto <[email protected]> · Thu, 26 Apr 2007 14:29:00 +0900

Hi,

I have updated my version of CA-Python interface module.
Please find a new tar.gz file as an attachment to this e-mail.
It may have multi core CPU(such as Intel Core Duo on my MacBook).
As far as I tested, it runs stable on a single core processors, i686 and
PPC.

Best regards,

Noboru

Zhong Ren wrote:
> Dear Noboru,
> 
> Thank you.  I must say the KEK CaPython314 is very easy to use.
> 
> I am not surprised that your little test below won't crash,
> since it does not contain a wx.Timer.  In order to repeat my
> crash, a wx.Timer must be constructed, it must be bound to a
> onTimer function, and it must be started.  Using
> threading.Timer instead of wx.Timer will not cause the crash.
>  I cannot tell who is guilty, wx.Timer or CaPython314.  I also
> have the feeling that Python 2.5 may be the problem.
> 
> Zhong
> 
> 
> ---- Original message ----
>> Date: Wed, 06 Dec 2006 10:47:29 +0900
>> From: Noboru Yamamoto <[email protected]>  
>> Subject: Re: wxPython timer and KEK CaPython314 cause core dump  
>> To: [email protected]
>> Cc: [email protected]
>>
>> Hi,
>>
>> I'm not familiar with WxPytho (yet).
>>
>> But, the following code works on MacBook running MacOSX
> 10.4.8 with
>> Python2.5,
> wxPython2.7-osx-unicode-2.7.2.0-universal10.4-py2.5.dmg
>> and KEK version of CaPython314 ( I should have used the
> different name
>> to avoid confusion with FNAL version. Sorry).
>>
>> ######################################
>> import wx,ca
>>
>> class MyApp(wx.PySimpleApp):
>>    def OnInit(self):
>>        frame = wx.Frame(None, -1, "Hello from wxPython")
>>        frame.Show(True)
>>        self.frame=frame
>>        self.ch=ca.channel("fred")
>>        self.ch.wait_conn()
>>        self.ch.monitor(self.ca_callback)
>>        self.ch.flush()
>>        self.SetTopWindow(frame)
>>        return True
>>
>>    def ca_callback(self,valstat):
>>        self.ch.update_val(valstat)
>>        self.frame.Title="%s:%f"%(self.ch.name,self.ch.val)
>>
>> if __name__ == "__main__":
>>    app = MyApp(0)
>>    app.MainLoop()
>>
>> #############################################
>>
>> I hope this can give some idea.
>> Regards,
>>
>> Noboru Yamamoto
>> EPICS group/J-PARC control group
>> KEK, JAPAN
>>
>> Zhong Ren wrote:
>>> I managed to isolate a core dump in a minimized Python code
>>> (see below).  I found two components are essential to cause a
>>> core dump: wx.Timer and ca.Monitor (or ca.Get).  Can someone
>>> tell what the problem is?
>>>
>>> ###############################################
>>> import wx
>>> import ca
>>>
>>> def onTimer(event): pass
>>>
>>> ca.Monitor('S:SRcurrentAI')
>>>
>>> appli = wx.PySimpleApp()
>>> frame = wx.Frame(None)
>>> timer = wx.Timer()
>>> timer.Bind(wx.EVT_TIMER, onTimer)
>>> timer.Start(milliseconds = 10, oneShot = False)
>>> appli.MainLoop()
>>> ###############################################
>>>
>>> Other info:
>>> Pyhton 2.5
>>> wxPython 2.6.3.3
>>> RedHat Linux x86_64
>>> GCC 4.1.1
>>>
>>> To test, let the routine run for a while.  A core dump will
>>> occur in a few minutes.
>> ________________

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System