Re: [boost] asio formal review begins

From: Bardur Arantsson (spam_at_[hidden])
Date: 2005-12-13 02:54:58

Oliver.Kowalke_at_[hidden] wrote:
>>>	sig::action sa;
[--snip--]
> 
> if ( ::sigaction( SIGPIPE, & sa, & old_sa) < 0)
> 	throw std::runtime_error( ::strerror( errno) );
> 
> // shared_ptr has to call ::sigaction( SIGPIPE, & old_sa, 0) in order to
> 
> // reset original signal handler
> 
> So it seams to be only 3 clib-function calls for each write operation.
> 

I'm aware that this wouldn't be needed for Linux, but I just though add 
something...

My Linux man page says that sigaction is a *system* call, and I would 
guess that it's the same on most Unixes -- indeed a quick google seems 
to indicate that this is also the case for SunOS/Solaris (at least the 
function is listed in the "system calls" section). System calls can be 
hideously expensive compared to regular C library function calls 
depending on architecture.

-- 
Bardur Arantsson
<bardurREMOVE_at_[hidden]>
<bardurREMOVE_at_[hidden]>
- That plot makes perfect sense. Wink, wink
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                                    Bender and Zoidberg / Futurama