what thread-synch mech to use for clean exit from a thread

zhangweiwu at realss.com zhangweiwu at realss.com
Mon Jul 15 04:32:52 CEST 2013


On Monday, July 15, 2013 10:27:45 AM UTC+8, Gildor Oronar wrote:
> What is the professional way in this case?

Hi. I am not a professional neither but I think a professional does this:

class CurrencyExchange():
    def __init__(in_case_callback):
       this.callback = in_case_callback
    def __run__():
       while time.time() - self.rate_timestamp < 5*3600:
          ... # update exchange rate
          if success:
             self.rate_timestamp == time.time()
          time.sleep(60)

def main():

    agio = CurrencyExchange(in_case = callback)
    agio.start()
    while agio.is_alive():
       do_something_delicate(rate_supplied_by=agio) 

Notice even if agio is no longer alive, it can still supply exchange rate for the last delicate_thing, only that it no longer updates punctually. This is semantic wrong, and I think it is the fault of python: how can something dead execute its method? In the API, thread.is_alive() should be renamed to thread.is_activate_and_on_his_own()




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