Thank you very much. It helped, so I can achive my goal :) (Wouldn't it be a good idea to add such an example to the addon manual? I think it is something what many people would need. If that is the case, I have a little application which shows how it works, and I could post it somewhere.)
Gergo On Friday, July 26, 2013 6:49:16 AM UTC+2, Rod Vagg wrote: > > > uv_async_send() is what you want for this case I believe, it ought to be > able to get data back into the event loop thread from a worker thread. Just > make sure you have a Persistent handle to the callback function so garbage > collection doesn't get it before you've stopped using it. > > Check out this (pure libuv) example to get an idea of what's going on: > http://nikhilm.github.io/uvbook/threads.html#inter-thread-communicationnotice > how there's two mechanisms for getting back in to the event loop, > uv_queue_work comes back when the work is completed but uv_async_send is > able to report ongoing progress before the worker is actually finished. > Translating that example to Node, you'd have main(), print_progress() and > after() being in the event loop thread (the V8 thread where you can mess > with V8 objects and execute callback functions into JS-land) while > fake_download() is in a worker thread where you shouldn't be touching V8 > objects directly. > > I hope that helps (and that I've got it right, hopefully Ben will correct > me if I've got anything wrong here). > -- Rod > > > On Friday, 26 July 2013 08:05:03 UTC+10, Sánta Gergely wrote: >> >> My problem is the following: In my cpp program, there is a main loop, >> which constantly counts 3D coordinates. And as soon as a newly counted >> coordinate is available, I would like it (the cpp program) to notify my >> node.js program through some event. >> >> A few days ago, someone in the mailing list gave me this link: >> https://github.com/rvagg/node-addon-examples/tree/master/9_async_work/ >> >> This is a very good starting point, becuse it tells, how to call >> cpp asynchronously. I call the cpp function from node.js, give that >> function my node.js callback function, >> but I can not call that callback from cpp periodically, only once. Maybe >> I don't understand it completely, but as I could figure out, in the >> async.cc file the CalculateAsync function hasto return, and after it >> returned, will be my node.js callback function invoked (so I can not call >> it more than once). >> >> Is there any chance to implement some kind of event somehow? >> >> Thanks, >> Gergo >> > -- -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en --- You received this message because you are subscribed to the Google Groups "nodejs" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
