Re: [Xen-devel] [PATCH] xs: set read_thread stacksize

[Simon Rowe <simon.rowe@xxxxxxxxxxxxx>]

On Tuesday 29 May 2012 20:39:33 Ian Campbell wrote:

> ...and if it were then autoconf is the way to figure that out now,
> unless _POSIX_THREAD_ATTR_STACKSIZE is specified somewhere (which I
> doubt).

I was following the recommendation of the POSIX Threads: Semi-FAQ which states


5.2 How can I determine if a system supports the Stack Attribute(s)?

If the header file unistd.h defines the symbolic constant  
_POSIX_THREAD_ATTR_STACKSIZE to a value greater than 0, the implementation 
should support the getting and setting of the Stack Size Attribute. If it 
defined to a value of 200112L then the current specification is supported.


If this needs to be done via autoconf let me know.

> Also if it is only pthread_attr_setstacksize which is optional, rather
> than pthread_attr_* generally, then the #if could be pulled into just
> surround that call, presuming there is no harm in a "NULL" attr.

I don't quite get you, do you mean only protect the actual 
pthread_attr_setstacksize() call with #ifdef and therefore always call 
pthread_attr_init()?
 
> > > +         pthread_attr_t attr;
> > > +
> > > +         if (pthread_attr_init(&attr) != 0) {
> > > +                 mutex_unlock(&h->request_mutex);
> > > +                 return false;
> > > +         }
> > > +         if (pthread_attr_setstacksize(&attr, 16 * 1024) != 0) {
> > 
> > #define for this value?
> 
> Yes, please.

Will do,

        Simon

--
[1] http://www.cognitus.net/html/howto/pthreadSemiFAQ_5.html#s5_1

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