How about: async_flush(null);
or simler: async_flush(); On Oct 21, 2012, at 10:10 AM, idleman <[email protected]> wrote: > Thanks for your answer! > > To make the question some more clear, I invoke huge number of asynchronous > functions, but sometimes I just don´t care about the result, but the function > itself require a callback to pass the result of the operation to. Would it in > those cases be smarter to create a global do_nothing() function and pass it > into all the asynchronous functions where I don´t care about the result, than > on invocation just create a new empty function: > > //new empty functions each time > async_http_get("http://statics.com?webpage=abc";, function() { }); > async_flush(function() { }); > > //or using a global do_nothing function > function do_nothing() { } > > async_http_get("http://statics.com?webpage=abc";, do_nothing); > async_flush(do_nothing); > > My question regards if V8 would easier optimize away the "callback" call when > using anonymous empty functions or not, because if it does, it would be > worthless to create a global do_nothing on the first place. > > But what I understood, V8 does no such optimizations? What would be better in > that case, using a global do_nothing() or not? > > Thanks in advance! > > > Den söndagen den 21:e oktober 2012 kl. 16:15:19 UTC+2 skrev Vyacheslav Egorov: > V8 does inline functions at call sites where target is observed to be always > the same. Inclined body is guarded by an identity check against identity of > the call target. If guard fails code is deoptimized. > > Thus what matters is whether each call site is monomorphic ( sees the same > function all the time) or megamorphic (sees different functions). > > Without seeing complete code it is hard to say whether you will help inlining > by creating a single empty function (inlining definitely will not happen if > you create new functions and send them to a single call site again and > again). But you will definitely save space. > > -- > Vyacheslav Egorov > On Oct 20, 2012 10:05 PM, "idleman" <[email protected]> wrote: > Hi, > > Is empty functions in lined whenever the function is know? Example: > > function do_nothing() { } > > //somewhere later in the code: > var cb = do_nothing; > cb(null, "Will this call be inlined/optimized away?"); > > Will V8 actually call the function, even if it does nothing? I wonder because > I want to know if it is smarter to create a do_nothing() function which will > be reused over and over again (but not as obvious) or each time create an > empty function { } directly in place and let the V8 more easily optimize away > the call. > > Thanks in advance! > > > > > -- > v8-users mailing list > [email protected] > http://groups.google.com/group/v8-users > > -- > v8-users mailing list > [email protected] > http://groups.google.com/group/v8-users -- v8-users mailing list [email protected] http://groups.google.com/group/v8-users
