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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [libgomp/] [parallel.c] - Blame information for rev 816

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/* Copyright (C) 2005 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 Lesser General Public License as published by
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   the Free Software Foundation; either version 2.1 of the License, or
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   (at your option) 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 Lesser General Public License for
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   more details.
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   You should have received a copy of the GNU Lesser General Public License
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   along with libgomp; see the file COPYING.LIB.  If not, write to the
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   Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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   MA 02110-1301, USA.  */
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/* As a special exception, if you link this library with other files, some
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   of which are compiled with GCC, to produce an executable, this library
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   does not by itself cause the resulting executable to be covered by the
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   GNU General Public License.  This exception does not however invalidate
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   any other reasons why the executable file might be covered by the GNU
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   General Public License.  */
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/* This file handles the (bare) PARALLEL construct.  */
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#include "libgomp.h"
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/* Determine the number of threads to be launched for a PARALLEL construct.
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   This algorithm is explicitly described in OpenMP 2.5 section 2.4.1.
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   SPECIFIED is a combination of the NUM_THREADS clause and the IF clause.
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   If the IF clause is false, SPECIFIED is forced to 1.  When NUM_THREADS
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   is not present, SPECIFIED is 0.  */
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unsigned
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gomp_resolve_num_threads (unsigned specified)
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{
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  /* Early exit for false IF condition or degenerate NUM_THREADS.  */
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  if (specified == 1)
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    return 1;
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  /* If this is a nested region, and nested regions are disabled, force
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     this team to use only one thread.  */
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  if (gomp_thread()->ts.team && !gomp_nest_var)
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    return 1;
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  /* If NUM_THREADS not specified, use nthreads_var.  */
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  if (specified == 0)
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    specified = gomp_nthreads_var;
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  /* If dynamic threads are enabled, bound the number of threads
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     that we launch.  */
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  if (gomp_dyn_var)
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    {
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      unsigned dyn = gomp_dynamic_max_threads ();
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      if (dyn < specified)
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        return dyn;
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    }
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  return specified;
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}
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void
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GOMP_parallel_start (void (*fn) (void *), void *data, unsigned num_threads)
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{
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  num_threads = gomp_resolve_num_threads (num_threads);
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  gomp_team_start (fn, data, num_threads, NULL);
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}
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void
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GOMP_parallel_end (void)
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{
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  gomp_team_end ();
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}
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/* The public OpenMP API for thread and team related inquiries.  */
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int
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omp_get_num_threads (void)
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{
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  struct gomp_team *team = gomp_thread ()->ts.team;
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  return team ? team->nthreads : 1;
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}
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/* ??? Does this function need to disregard dyn_var?  I don't see
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   how else one could get a useable "maximum".  */
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int
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omp_get_max_threads (void)
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{
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  return gomp_resolve_num_threads (0);
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}
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int
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omp_get_thread_num (void)
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{
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  return gomp_thread ()->ts.team_id;
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}
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/* ??? This isn't right.  The definition of this function is false if any
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   of the IF clauses for any of the parallels is false.  Which is not the
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   same thing as any outer team having more than one thread.  */
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int omp_in_parallel (void)
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{
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  struct gomp_team *team = gomp_thread ()->ts.team;
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  while (team)
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    {
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      if (team->nthreads > 1)
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        return true;
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      team = team->prev_ts.team;
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    }
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  return false;
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}
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ialias (omp_get_num_threads)
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ialias (omp_get_max_threads)
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ialias (omp_get_thread_num)
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ialias (omp_in_parallel)

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