[cfe-dev] libclang cancellation of long running tasks

[Jonathan Roelofs]

John,

It should be fairly straightforward for you to implement this behavior 
in your application using std::future::wait_for.


Jon

On 1/12/15 6:33 PM, John Sully wrote:
> Yes it already runs on a separate thread; however when its known the
> result is no longer necessary (for example the user changed the cursor
> location - negating the need for autocomplete at the previous location)
> the separate thread still runs consuming resources.
>
> On slower devices like laptops these operations can take a long time.
> Even if we are willing to accept the waste of cycles (and battery
> life!), the processor has a limited number of cores and responsiveness
> will be poor if too many "zombie" jobs are still running.
>
> I'm willing to add this functionality and submit it upstream if
> necessary, but prior to doing so I wanted to reach out to current
> developers.  It would be unfortunate to invest significant effort only
> to find my patch can't be accepted for an avoidable reason.
>
>
> On Mon, Jan 12, 2015 at 4:09 PM, Sean Silva <chisophugis at gmail.com
> <mailto:chisophugis at gmail.com>> wrote:
>
>     Have you tried running libclang on a separate thread?
>
>     On Sun, Jan 11, 2015 at 7:59 PM, John Sully <john at csquare.ca
>     <mailto:john at csquare.ca>> wrote:
>
>         I'm in the process of writing an editor based upon libclang, and
>         a major issue I'm hitting is the inability to cancel long
>         running tasks.  The primary tasks are parsing and creation of
>         auto-complete results.
>
>         Is there already functionality to do this that I've missed?
>
>         If not, I would like to implement this as its a requirement to
>         get good responsiveness out of my editor.  Has there been any
>         prior discussions on how this should be implemented?
>
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-- 
Jon Roelofs
jonathan at codesourcery.com
CodeSourcery / Mentor Embedded