Re: how to cast away 'volatile'?

[Matthew Woehlke <mw_triad at users dot sourceforge dot net>]

Andrew Haley wrote:
> Michael Eager writes:
> > It can also be used to share data between threads, but it becomes
> > problematic if accesses are not atomic.  It's reasonable to use a
> > shared volatile sig_atomic_t to communicate between threads, to say
> > "I'm done" or "Start processing". 
>
> Is that really safe, though?  There's nothing to stop the machine from
> reordering memory writes, even if the compiler doesn't.

...my understanding is that is exactly what 'fence' is for. (Although I 
have yet to meet a processor that doesn't SIGILL when I try to use it 
:-). So I stick with e.g. 'lock or 0,%sp'...)

--
Matthew
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