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/* Copyright (C) 2005, 2007 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 Lesser General Public License as published by

   the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for

   more details.

   You should have received a copy of the GNU Lesser General Public License

   along with libgomp; see the file COPYING.LIB.  If not, write to the

   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,

   MA 02110-1301, USA.  */

/* As a special exception, if you link this library with other files, some

   of which are compiled with GCC, to produce an executable, this library

   does not by itself cause the resulting executable to be covered by the

   GNU General Public License.  This exception does not however invalidate

   any other reasons why the executable file might be covered by the GNU

   General Public License.  */

/* This file handles the SECTIONS construct.  */

#include "libgomp.h"

/* Initialize the given work share construct from the given arguments.  */

static inline void

gomp_sections_init (struct gomp_work_share *ws, unsigned count)

{

  ws->sched = GFS_DYNAMIC;

  ws->chunk_size = 1;

  ws->end = count + 1;

  ws->incr = 1;

  ws->next = 1;

}

/* This routine is called when first encountering a sections construct

   that is not bound directly to a parallel construct.  The first thread

   that arrives will create the work-share construct; subsequent threads

   will see the construct exists and allocate work from it.

   COUNT is the number of sections in this construct.

   Returns the 1-based section number for this thread to perform, or 0 if

   all work was assigned to other threads prior to this thread's arrival.  */

unsigned

GOMP_sections_start (unsigned count)

{

  struct gomp_thread *thr = gomp_thread ();

  long s, e, ret;

  if (gomp_work_share_start (false))

    gomp_sections_init (thr->ts.work_share, count);

  if (gomp_iter_dynamic_next_locked (&s, &e))

    ret = s;

  else

    ret = 0;

  gomp_mutex_unlock (&thr->ts.work_share->lock);

  return ret;

}

/* This routine is called when the thread completes processing of the

   section currently assigned to it.  If the work-share construct is

   bound directly to a parallel construct, then the construct may have

   been set up before the parallel.  In which case, this may be the

   first iteration for the thread.

   Returns the 1-based section number for this thread to perform, or 0 if

   all work was assigned to other threads prior to this thread's arrival.  */

unsigned

GOMP_sections_next (void)

{

  struct gomp_thread *thr = gomp_thread ();

  long s, e, ret;

  gomp_mutex_lock (&thr->ts.work_share->lock);

  if (gomp_iter_dynamic_next_locked (&s, &e))

    ret = s;

  else

    ret = 0;

  gomp_mutex_unlock (&thr->ts.work_share->lock);

  return ret;

}

/* This routine pre-initializes a work-share construct to avoid one

   synchronization once we get into the loop.  */

void

GOMP_parallel_sections_start (void (*fn) (void *), void *data,

                              unsigned num_threads, unsigned count)

{

  struct gomp_work_share *ws;

  num_threads = gomp_resolve_num_threads (num_threads);

  if (gomp_dyn_var && num_threads > count)

    num_threads = count;

  ws = gomp_new_work_share (false, num_threads);

  gomp_sections_init (ws, count);

  gomp_team_start (fn, data, num_threads, ws);

}

/* The GOMP_section_end* routines are called after the thread is told

   that all sections are complete.  This first version synchronizes

   all threads; the nowait version does not.  */

void

GOMP_sections_end (void)

{

  gomp_work_share_end ();

}

void

GOMP_sections_end_nowait (void)

{

  gomp_work_share_end_nowait ();

}