Re: libm reentrancy

[Craig Howland <howland at LGSInnovations dot com>]

errno is not a problem, as it is transparently taken care of--see sys/errno.h.
errno is not really a global, but calls a function that returns a pointer to
the thread's individual errno within the reentrancy structure.
Craig

On 01/09/2013 09:06 AM, Gregory Pietsch wrote:
> Oh yeah, forgot about errno. I guess the best way to avoid that is to make sure
> the number you are taking the square root of isn't negative. -- Gregory
>
> On 1/9/2013 4:37 AM, Marcus Hult wrote:
> > Hello,
> >
> > Thanks for your reply Gregory.
> >
> > The sqrt function for instance, may set the errno variable according
> > to the manual. Shouldn’t this function then have a reentrant version?
> > Or do I always need to use the _impure_ptr when using libm, to be thread safe?
> >
> > /Marcus