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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [libgomp/] [sections.c] - Blame information for rev 859

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1 273 jeremybenn
/* Copyright (C) 2005, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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   Contributed by Richard Henderson <rth@redhat.com>.
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   This file is part of the GNU OpenMP Library (libgomp).
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   Libgomp is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   more details.
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   Under Section 7 of GPL version 3, you are granted additional
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   permissions described in the GCC Runtime Library Exception, version
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   3.1, as published by the Free Software Foundation.
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   You should have received a copy of the GNU General Public License and
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   a copy of the GCC Runtime Library Exception along with this program;
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   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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   <http://www.gnu.org/licenses/>.  */
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/* This file handles the SECTIONS construct.  */
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#include "libgomp.h"
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/* Initialize the given work share construct from the given arguments.  */
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static inline void
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gomp_sections_init (struct gomp_work_share *ws, unsigned count)
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{
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  ws->sched = GFS_DYNAMIC;
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  ws->chunk_size = 1;
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  ws->end = count + 1L;
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  ws->incr = 1;
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  ws->next = 1;
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#ifdef HAVE_SYNC_BUILTINS
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  /* Prepare things to make each iteration faster.  */
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  if (sizeof (long) > sizeof (unsigned))
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    ws->mode = 1;
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  else
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    {
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      struct gomp_thread *thr = gomp_thread ();
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      struct gomp_team *team = thr->ts.team;
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      long nthreads = team ? team->nthreads : 1;
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      ws->mode = ((nthreads | ws->end)
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                  < 1UL << (sizeof (long) * __CHAR_BIT__ / 2 - 1));
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    }
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#else
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  ws->mode = 0;
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#endif
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}
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/* This routine is called when first encountering a sections construct
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   that is not bound directly to a parallel construct.  The first thread
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   that arrives will create the work-share construct; subsequent threads
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   will see the construct exists and allocate work from it.
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   COUNT is the number of sections in this construct.
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   Returns the 1-based section number for this thread to perform, or 0 if
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   all work was assigned to other threads prior to this thread's arrival.  */
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unsigned
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GOMP_sections_start (unsigned count)
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{
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  struct gomp_thread *thr = gomp_thread ();
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  long s, e, ret;
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  if (gomp_work_share_start (false))
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    {
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      gomp_sections_init (thr->ts.work_share, count);
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      gomp_work_share_init_done ();
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    }
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#ifdef HAVE_SYNC_BUILTINS
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  if (gomp_iter_dynamic_next (&s, &e))
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    ret = s;
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  else
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    ret = 0;
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#else
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  gomp_mutex_lock (&thr->ts.work_share->lock);
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  if (gomp_iter_dynamic_next_locked (&s, &e))
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    ret = s;
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  else
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    ret = 0;
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  gomp_mutex_unlock (&thr->ts.work_share->lock);
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#endif
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  return ret;
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}
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/* This routine is called when the thread completes processing of the
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   section currently assigned to it.  If the work-share construct is
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   bound directly to a parallel construct, then the construct may have
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   been set up before the parallel.  In which case, this may be the
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   first iteration for the thread.
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   Returns the 1-based section number for this thread to perform, or 0 if
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   all work was assigned to other threads prior to this thread's arrival.  */
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unsigned
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GOMP_sections_next (void)
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{
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  long s, e, ret;
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#ifdef HAVE_SYNC_BUILTINS
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  if (gomp_iter_dynamic_next (&s, &e))
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    ret = s;
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  else
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    ret = 0;
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#else
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  struct gomp_thread *thr = gomp_thread ();
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  gomp_mutex_lock (&thr->ts.work_share->lock);
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  if (gomp_iter_dynamic_next_locked (&s, &e))
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    ret = s;
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  else
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    ret = 0;
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  gomp_mutex_unlock (&thr->ts.work_share->lock);
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#endif
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  return ret;
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}
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/* This routine pre-initializes a work-share construct to avoid one
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   synchronization once we get into the loop.  */
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void
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GOMP_parallel_sections_start (void (*fn) (void *), void *data,
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                              unsigned num_threads, unsigned count)
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{
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  struct gomp_team *team;
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  num_threads = gomp_resolve_num_threads (num_threads, count);
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  team = gomp_new_team (num_threads);
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  gomp_sections_init (&team->work_shares[0], count);
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  gomp_team_start (fn, data, num_threads, team);
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}
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/* The GOMP_section_end* routines are called after the thread is told
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   that all sections are complete.  This first version synchronizes
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   all threads; the nowait version does not.  */
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void
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GOMP_sections_end (void)
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{
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  gomp_work_share_end ();
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}
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void
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GOMP_sections_end_nowait (void)
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{
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  gomp_work_share_end_nowait ();
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}

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