gcc/libgomp/target.c

/* Copyright (C) 2013 Free Software Foundation, Inc.
   Contributed by Jakub Jelinek <jakub@redhat.com>.

   This file is part of the GNU OpenMP Library (libgomp).

   Libgomp is free software; you can redistribute it and/or modify it
   under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3, or (at your option)
   any later version.

   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
   more details.

   Under Section 7 of GPL version 3, you are granted additional
   permissions described in the GCC Runtime Library Exception, version
   3.1, as published by the Free Software Foundation.

   You should have received a copy of the GNU General Public License and
   a copy of the GCC Runtime Library Exception along with this program;
   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
   <http://www.gnu.org/licenses/>.  */

/* This file handles the maintainence of threads in response to team
   creation and termination.  */

#include "libgomp.h"
#include <limits.h>
#include <stdbool.h>
#include <stdlib.h>
#include <string.h>

attribute_hidden int
gomp_get_num_devices (void)
{
  return 0;
}

/* Called when encountering a target directive.  If DEVICE
   is -1, it means use device-var ICV.  If it is -2 (or any other value
   larger than last available hw device, use host fallback.
   FN is address of host code, OPENMP_TARGET contains value of the
   __OPENMP_TARGET__ symbol in the shared library or binary that invokes
   GOMP_target.  HOSTADDRS, SIZES and KINDS are arrays
   with MAPNUM entries, with addresses of the host objects,
   sizes of the host objects (resp. for pointer kind pointer bias
   and assumed sizeof (void *) size) and kinds.  */

void
GOMP_target (int device, void (*fn) (void *), const void *openmp_target,
	     size_t mapnum, void **hostaddrs, size_t *sizes,
	     unsigned char *kinds)
{
  /* Host fallback.  */
  struct gomp_thread old_thr, *thr = gomp_thread ();
  old_thr = *thr;
  memset (thr, '\0', sizeof (*thr));
  if (gomp_places_list)
    {
      thr->place = old_thr.place;
      thr->ts.place_partition_len = gomp_places_list_len;
    }
  fn (hostaddrs);
  gomp_free_thread (thr);
  *thr = old_thr;
}

void
GOMP_target_data (int device, const void *openmp_target, size_t mapnum,
		  void **hostaddrs, size_t *sizes, unsigned char *kinds)
{
}

void
GOMP_target_end_data (void)
{
}

void
GOMP_target_update (int device, const void *openmp_target, size_t mapnum,
		    void **hostaddrs, size_t *sizes, unsigned char *kinds)
{
}

void
GOMP_teams (unsigned int num_teams, unsigned int thread_limit)
{
  if (thread_limit)
    {
      struct gomp_task_icv *icv = gomp_icv (true);
      icv->thread_limit_var
	= thread_limit > INT_MAX ? UINT_MAX : thread_limit;
    }
  (void) num_teams;
}