Re: [boost] [asio] Pass some parameter to io_service::run

Subject: Re: [boost] [asio] Pass some parameter to io_service::run
From: James Mansion (james_at_[hidden])
Date: 2010-01-11 15:13:20

Dmytro Ovdiienko wrote:
>
>     I don't understand why you would have an objection to a permanent
>     binding with TLS 
>
>
> TLS looks like global variables. Global variables violate 
> encapsulation. I suppose to support my program at least 2 years. I 
> don't want to hate myself two years :)
I think that's quite a silly reason.  So are singletons, but they are 
both useful. ...
>  
>
>     or
>     a temporary binding using a pool of parsers, since it seems that
>     each datagram must be
>     parsed entirely and then the parser reset for the next? 
>
>
> Exactly. But I don't want to create pool of the parsers. Access to the 
> pool should be synchronized. Synchronization eats CPU times.
... but not nearly as silly as this one.  Getting an item from a pool is 
a great candidate for a spinlock and if you're concerned you can easily 
segment the pool.  Its a non-issue. I defy you to measure it in the 
context of all teh context switching and system calls you're doing.

Of course, the pool is a singleton. And that's like a global.

The right tools to get you what you want are right there - you're just 
choosing not to use them for academic reasons.

James