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Re: C++ FQA [message #12621 is a reply to message #12618]

Sun, 11 November 2007 09:54

mirek is currently offline

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

mdelfede wrote on Sat, 10 November 2007 17:57

luzr wrote on Sat, 10 November 2007 17:54

cbpporter wrote on Sat, 10 November 2007 11:31

And I'm quite surprised to see people who don't like gc, but have nothing against reference counting, which is slower and almost impossible to use efficiently in a multi-threading application.

I mostly agree with this...

As with GC, refcount can be made thread safe, IMHO.

The things is that even thread unsafe reference counting is about as fast or slower than mark&sweep GC.

And, w.r.t. thread safety, the another trouble is that you cannot safely use atomic operations only when the object is really shared between threads (when it is needed).

Quote:

Even pick_ can be not thread safe, if it's bad coded, and must have some sort of synchronizing code to be thread safe.

Everything can be thread unsafe if you really try. Anyway, the simplest pick_ implementation is naturaly thread safe.

Quote:

I would not accept a language based mostly on GC, but I've got nothing against an optional gc among other management stuffs.

The problem is that this is not quite possible.

Quote:

BTW, I can't see how refcount can be slower than GC... maybe I'm wrong, but I'd like to have it explained !

OK, only think about the amount of operations that have to be performed in simple "return the value" scenario

RefCounted<Foo> Fn() {
   RefCounted<Foo> x = new Foo;
   .....
   return x;
}

void Fn2() {
   RefCounted<Foo> y = new Foo;
   ...
   y = Fn();
}

Mirek

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[Message index]

		C++ FQA By: unodgs on Tue, 06 November 2007 23:27
		Re: C++ FQA By: Mindtraveller on Wed, 07 November 2007 00:41
		Re: C++ FQA By: unodgs on Wed, 07 November 2007 10:40
		Re: C++ FQA By: cbpporter on Wed, 07 November 2007 11:33
		Re: C++ FQA By: unodgs on Wed, 07 November 2007 13:15
		Re: C++ FQA By: Mindtraveller on Wed, 07 November 2007 14:03
		Re: C++ FQA By: cbpporter on Wed, 07 November 2007 14:57
		Re: C++ FQA By: Mindtraveller on Wed, 07 November 2007 18:02
		Re: C++ FQA By: cbpporter on Wed, 07 November 2007 19:30
		Re: C++ FQA By: Mindtraveller on Thu, 08 November 2007 00:13
		Re: C++ FQA By: mirek on Thu, 08 November 2007 05:34
		Re: C++ FQA By: Zardos on Thu, 08 November 2007 13:33
		Re: C++ FQA By: mirek on Thu, 08 November 2007 19:25
		Re: C++ FQA By: mdelfede on Thu, 08 November 2007 23:39
		Re: C++ FQA By: mirek on Fri, 09 November 2007 08:51
		Re: C++ FQA By: mdelfede on Fri, 09 November 2007 13:41
		Re: C++ FQA By: mirek on Fri, 09 November 2007 14:48
		Re: C++ FQA By: mdelfede on Fri, 09 November 2007 15:52
		Re: C++ FQA By: waxblood on Fri, 09 November 2007 17:07
		Re: C++ FQA By: mdelfede on Fri, 09 November 2007 19:51
		Re: C++ FQA By: mirek on Sat, 10 November 2007 15:14
		Re: C++ FQA By: mdelfede on Sat, 10 November 2007 17:06
		Re: C++ FQA By: cbpporter on Sat, 10 November 2007 17:31
		Re: C++ FQA By: mirek on Sat, 10 November 2007 17:54
		Re: C++ FQA By: mdelfede on Sat, 10 November 2007 23:57
		Re: C++ FQA By: mirek on Sun, 11 November 2007 09:54
		Re: C++ FQA By: mdelfede on Sun, 11 November 2007 11:25
		Re: C++ FQA By: Zardos on Tue, 13 November 2007 01:56
		Re: C++ FQA By: mirek on Tue, 13 November 2007 09:25
		Re: C++ FQA By: cbpporter on Tue, 13 November 2007 10:14
		Re: C++ FQA By: mirek on Tue, 13 November 2007 10:52
		Re: C++ FQA By: mirek on Thu, 22 November 2007 05:43
		Re: C++ FQA By: mdelfede on Sun, 11 November 2007 11:36
		Re: C++ FQA By: Mindtraveller on Sun, 11 November 2007 18:22
		Re: C++ FQA By: mdelfede on Sun, 11 November 2007 18:52
		Re: C++ FQA By: Mindtraveller on Mon, 12 November 2007 00:58
		Re: C++ FQA By: mirek on Mon, 12 November 2007 09:46
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 10:19
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 10:28
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 11:43
		Re: C++ FQA By: Mindtraveller on Mon, 12 November 2007 15:54
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 16:47
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 16:51
		Re: C++ FQA By: mirek on Mon, 12 November 2007 20:15
		Re: C++ FQA By: mirek on Mon, 12 November 2007 20:21
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 21:39
		Re: C++ FQA By: mirek on Mon, 12 November 2007 22:43
		Re: C++ FQA By: cbpporter on Mon, 12 November 2007 23:22
		Re: C++ FQA By: mirek on Mon, 12 November 2007 23:34
		Re: C++ FQA By: mdelfede on Mon, 12 November 2007 23:33
		Re: C++ FQA By: exolon on Tue, 13 November 2007 17:30
		Re: C++ FQA By: mdelfede on Tue, 13 November 2007 18:24
		Re: C++ FQA By: exolon on Tue, 13 November 2007 18:58
		Re: C++ FQA By: Mindtraveller on Fri, 16 November 2007 00:43
		Re: C++ FQA By: mirek on Fri, 16 November 2007 11:59
		Re: C++ FQA By: waxblood on Fri, 16 November 2007 16:24
		Re: C++ FQA By: mdelfede on Fri, 16 November 2007 16:37
		Re: C++ FQA By: mirek on Sat, 17 November 2007 10:04
		Re: C++ FQA By: mirek on Sat, 10 November 2007 15:22
		Re: C++ FQA By: mdelfede on Sat, 10 November 2007 16:58
		Re: C++ FQA By: mirek on Thu, 08 November 2007 05:25
		Re: C++ FQA By: mirek on Wed, 07 November 2007 15:14
		Re: C++ FQA By: mdelfede on Wed, 07 November 2007 15:39
		Re: C++ FQA By: exolon on Mon, 12 November 2007 13:09
		Re: C++ FQA By: mr_ped on Wed, 07 November 2007 17:05
		Re: C++ FQA By: tvanriper on Fri, 09 November 2007 12:56
		Re: C++ FQA By: mr_ped on Sat, 10 November 2007 22:26
		Re: C++ FQA By: mirek on Sat, 10 November 2007 22:35
		Re: C++ FQA By: Mindtraveller on Tue, 13 November 2007 02:41
		Re: C++ FQA By: Mindtraveller on Thu, 27 December 2007 14:47

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