Re: [boost] singleton and thread safety

From: Jonathan Wakely (cow_at_[hidden])
Date: 2005-08-03 06:11:59

Alexander Terekhov wrote:

> 
> Jonathan Wakely wrote:
> > 
> > Pthreads knows nothing about exceptions, 
> 
> That's not true.
> 
> http://www.opengroup.org/onlinepubs/009695399/functions/pthread_once.html
> 
> "The pthread_once() function is not a cancellation point. However, if 
>  init_routine is a cancellation point and is canceled, the effect on 
>  once_control shall be as if pthread_once() was never called."

Yep, that's what I referred to in my mail.

> http://www.opengroup.org/onlinepubs/009695399/functions/pthread_cleanup_push.html
> 
> "Note that the specified cleanup handling mechanism is especially tied 
>  to the C language and, while the requirement for a uniform mechanism 
>  for expressing cleanup is language-independent, the mechanism used in 
>  other languages may be quite different. In addition, this mechanism 
>  is really only necessary due to the lack of a real exception 
>  mechanism in the C language, which would be the ideal solution."

Good point, but as you know, it's not settled whether cancellation is
a C++ exception ... but let's not start this on the Boost list as well,
I have other mailboxes for that subject!  :)

jon

-- 
"Accept the contradictions"
	- The KLF