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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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