Am 20.11.2013 um 09:58 schrieb Chris Laws <[email protected]>:

> Many of my system's (CZMQ based) applications are long running, though some 
> applications within my system come and go. Many applications do various timer 
> based work when certain applications are present and should not be doing 
> these timer actions when certain applications are not present. Consequently, 
> I have a need to be able to cancel certain timers (but not all timers) 
> throughout the lifetime of my applications without stopping all of the 
> application timers.
> 
> The current zloop timer implementation makes this difficult for me because it 
> cancels all timers that match the 'arg'. Typically the 'arg' is the 
> application context structure containing useful references to application 
> data and state. In my case it is always the 'arg' and I would think that this 
> is pretty standard usage too.
> 
> I've submitted pull request #318 (https://github.com/zeromq/czmq/pull/318) to 
> create a conversation topic regarding the changes contained within, which 
> change the behaviour such that timers can be cancelled using their timer_id. 
> I've been using this code successfully for some time now and the 
> czmq_selftest indicates that there are no leaks. Ideally I'd like this 
> functionality present in czmq, pending no significant issues, objections or 
> show stoppers. As Pieter points out, this constitutes an API change.
> 
> This implementation fits well with the event-reactor style applications I 
> create that typically finalise and terminate upon exit of the event loop. 
> Perhaps this implementation might not fit so well with other styles?
> 
> Thoughts? Would this type of change help or hinder you?

yes it would help - finer grained control is a definite plus

- Michael

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