Re: How to run a repeating timer every n minutes?
Diez B. Roggisch wrote: mk wrote: I'm newbie at threading, so I'm actually asking: should not method like stop() be surrounded with acquire() and release() of some threading.lock? I mean, is this safe to update running thread's data from the main thread without lock? stop() is part of the Timer-interface, and tas it's not mentioned to be unsafe in the docs you can just call it. It might be that it internally calls some threadsafe means of communication (Event, Lock). Thought I should jump in here to avoid any confusion. mk is referring to the Timer class that I included in my reply to the OP. It is different from the Timer class in the threading module. I had not realised that I was duplicating an existing name - sorry about that. The standard Timer class has a method called cancel(). I am sure that Diez's comments above will apply to this. I included a method called stop() in my Timer class, and I think it is to this that mk is referring. The method looks like this - def stop(self): self.event.set() Is this threadsafe? I would have thought the answer is yes, but I am no expert. Perhaps someone else can confirm. Thanks Frank Millman -- http://mail.python.org/mailman/listinfo/python-list
Re: How to run a repeating timer every n minutes?
I use the wx.Timer for this: import wx timer = wx.Timer(self, -1) # update gui every 1/4 second (250ms) timer.Start(250) Bind(wx.EVT_TIMER, OnUpdateValues) In the above I'm running the OnUpdateValues function every 250ms. Regards, Wesley Brooks 2009/10/29 VYAS ASHISH M-NTB837 ashish.v...@motorola.com Dear All How do I write a code that gets executed 'every x' minutes? I know how to do it 'after x' minutes, I do the following: def doAtTimerFire(): The things I want to do 'after x' minutes go here. And then from main code, I do this: tmr = threading.Timer(timeInSeconds, doAtTimerFire) tmr.start() Sorry about the earlier post with wrong subject line. Please help. Regards, Ashish Vyas -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: How to run a repeating timer every n minutes?
VYAS ASHISH M-NTB837 wrote: cut You might want to start a thread with a continues loop that primarily sleeps (time.sleep) but wakes up at regular intervals and executes what needs to be. -- MPH http://blog.dcuktec.com 'If consumed, best digested with added seasoning to own preference.' -- http://mail.python.org/mailman/listinfo/python-list
Re: How to run a repeating timer every n minutes?
Ashish Vyas wrote: Dear All How do I write a code that gets executed 'every x' minutes? [...] Regards, Ashish Vyas Here is one way - import threading class Timer(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.event = threading.Event() def run(self): while not self.event.is_set(): The things I want to do go here. self.event.wait(number_of_seconds_to_wait) def stop(self): self.event.set() In your main program - - to start the timer tmr = Timer() tmr.start() - to stop the timer tmr.stop() It is easy to extend this by passing the number_of_seconds_to_wait, or a function name to be executed, as arguments to the Timer. Frank Millman -- http://mail.python.org/mailman/listinfo/python-list
RE: How to run a repeating timer every n minutes?
Thanks a lot, this helps. -Original Message- From: python-list-bounces+ntb837=motorola@python.org [mailto:python-list-bounces+ntb837=motorola@python.org] On Behalf Of Frank Millman Sent: Thursday, October 29, 2009 5:19 PM To: python-list@python.org Subject: Re: How to run a repeating timer every n minutes? Ashish Vyas wrote: Dear All How do I write a code that gets executed 'every x' minutes? [...] Regards, Ashish Vyas Here is one way - import threading class Timer(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.event = threading.Event() def run(self): while not self.event.is_set(): The things I want to do go here. self.event.wait(number_of_seconds_to_wait) def stop(self): self.event.set() In your main program - - to start the timer tmr = Timer() tmr.start() - to stop the timer tmr.stop() It is easy to extend this by passing the number_of_seconds_to_wait, or a function name to be executed, as arguments to the Timer. Frank Millman -- http://mail.python.org/mailman/listinfo/python-list -- http://mail.python.org/mailman/listinfo/python-list
Re: How to run a repeating timer every n minutes?
Frank Millman wrote: class Timer(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.event = threading.Event() def run(self): while not self.event.is_set(): The things I want to do go here. self.event.wait(number_of_seconds_to_wait) def stop(self): self.event.set() In your main program - - to start the timer tmr = Timer() tmr.start() - to stop the timer tmr.stop() It is easy to extend this by passing the number_of_seconds_to_wait, or a function name to be executed, as arguments to the Timer. I'm newbie at threading, so I'm actually asking: should not method like stop() be surrounded with acquire() and release() of some threading.lock? I mean, is this safe to update running thread's data from the main thread without lock? Regards, mk -- http://mail.python.org/mailman/listinfo/python-list
Re: How to run a repeating timer every n minutes?
mk wrote: Frank Millman wrote: class Timer(threading.Thread): def __init__(self): threading.Thread.__init__(self) self.event = threading.Event() def run(self): while not self.event.is_set(): The things I want to do go here. self.event.wait(number_of_seconds_to_wait) def stop(self): self.event.set() In your main program - - to start the timer tmr = Timer() tmr.start() - to stop the timer tmr.stop() It is easy to extend this by passing the number_of_seconds_to_wait, or a function name to be executed, as arguments to the Timer. I'm newbie at threading, so I'm actually asking: should not method like stop() be surrounded with acquire() and release() of some threading.lock? I mean, is this safe to update running thread's data from the main thread without lock? stop() is part of the Timer-interface, and tas it's not mentioned to be unsafe in the docs you can just call it. It might be that it internally calls some threadsafe means of communication (Event, Lock). In general you are right, however many of those considerations don't apply to (C)Python due to the GIL (global interpreter lock), which ensures that a lot of operations are atomic. For example, in current CPython it's perfectly safe to simply set a boolean instance variable to False to stop an running loop. Diez -- http://mail.python.org/mailman/listinfo/python-list
