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/* Copyright (C) 2005, 2008, 2009 Free Software Foundation, Inc.

   Contributed by Richard Henderson <rth@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 SINGLE construct.  */

#include "libgomp.h"

/* This routine is called when first encountering a SINGLE construct that

   doesn't have a COPYPRIVATE clause.  Returns true if this is the thread

   that should execute the clause.  */

bool

GOMP_single_start (void)

{

#ifdef HAVE_SYNC_BUILTINS

  struct gomp_thread *thr = gomp_thread ();

  struct gomp_team *team = thr->ts.team;

  unsigned long single_count;

  if (__builtin_expect (team == NULL, 0))

    return true;

  single_count = thr->ts.single_count++;

  return __sync_bool_compare_and_swap (&team->single_count, single_count,

                                       single_count + 1L);

#else

  bool ret = gomp_work_share_start (false);

  if (ret)

    gomp_work_share_init_done ();

  gomp_work_share_end_nowait ();

  return ret;

#endif

}

/* This routine is called when first encountering a SINGLE construct that

   does have a COPYPRIVATE clause.  Returns NULL if this is the thread

   that should execute the clause; otherwise the return value is pointer

   given to GOMP_single_copy_end by the thread that did execute the clause.  */

void *

GOMP_single_copy_start (void)

{

  struct gomp_thread *thr = gomp_thread ();

  bool first;

  void *ret;

  first = gomp_work_share_start (false);

  if (first)

    {

      gomp_work_share_init_done ();

      ret = NULL;

    }

  else

    {

      gomp_team_barrier_wait (&thr->ts.team->barrier);

      ret = thr->ts.work_share->copyprivate;

      gomp_work_share_end_nowait ();

    }

  return ret;

}

/* This routine is called when the thread that entered a SINGLE construct

   with a COPYPRIVATE clause gets to the end of the construct.  */

void

GOMP_single_copy_end (void *data)

{

  struct gomp_thread *thr = gomp_thread ();

  struct gomp_team *team = thr->ts.team;

  if (team != NULL)

    {

      thr->ts.work_share->copyprivate = data;

      gomp_team_barrier_wait (&team->barrier);

    }

  gomp_work_share_end_nowait ();

}