On Thu, Jan 31, 2019 at 10:37 AM Sebastian Huber
<sebastian.hu...@embedded-brains.de> wrote:
>
> On 31/01/2019 10:29, Richard Biener wrote:
> > On Wed, Jan 30, 2019 at 3:46 PM Sebastian Huber
> > <sebastian.hu...@embedded-brains.de> wrote:
> >> Hello,
> >>
> >> we would like to use libgomp in a quite constraint environment. In this
> >> environment using for example the C locale support, errno, malloc(),
> >> realloc(), free(), and abort() are problematic. One option would be to
> >> introduce a new header file "config/*/platform.h" which is included in
> >> libgomp.h right after the #include "config.h". A platform could then do
> >> something like this:
> >>
> >> #define malloc(size) platform_malloc(size)
> >> ...
> >>
> >> In env.c there are some uses of strto*() like this:
> >>
> >> errno = 0;
> >> stride = strtol (env, &env, 10);
> >> if (errno)
> >> return false;
> >>
> >> I would like to introduce a new header file "strto.h" which defines
> >> something like this:
> >>
> >> static inline char *
> >> gomp_strtol (char *s, long *value)
> >> {
> >> char *end;
> >>
> >> errno = 0;
> >> *value = strtol (s, &end, 10);
> >> if (errno != 0)
> >> return NULL;
> >>
> >> return end;
> >> }
> >>
> >> Then use:
> >>
> >> env = gomp_strtol (env, &stride);
> >> if (env == NULL)
> >> return false;
> >>
> >> A platform could then provide its own "config/*/strto.h" with an
> >> alternative implementation.
> >>
> >> Would this be acceptable after the GCC 9 release?
> > I guess you could look at what nvptx and HSA (and GCN on some branch)
> > do here?
>
> My problem is that our real-time operating system (RTEMS) is somewhere
> in between a full blown Linux and the offload hardware. I would like to
> get rid of stuff which depends on the Newlib struct _reent since this
> pulls in a lot of dependencies. The heavy weight functions are just used
> for the initialization (env.c) and error reporting. Containing the heap
> allocation functions helps to control the memory used by OpenMP
> computations.
I suppose supplying a RTEMS specific noop-stub would work here
and that's close enough to what the offload stuff does. But I'm not
very familiar with this so sorry if misleading you.
Richard.
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Dornierstr. 4, D-82178 Puchheim, Germany
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>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
