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/* Copyright (C) 2005-2013 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 (bare) PARALLEL construct. */
#include "libgomp.h"
#include <limits.h>
/* Determine the number of threads to be launched for a PARALLEL construct.
This algorithm is explicitly described in OpenMP 3.0 section 2.4.1.
SPECIFIED is a combination of the NUM_THREADS clause and the IF clause.
If the IF clause is false, SPECIFIED is forced to 1. When NUM_THREADS
is not present, SPECIFIED is 0. */
unsigned
gomp_resolve_num_threads (unsigned specified, unsigned count)
{
struct gomp_thread *thread = gomp_thread();
struct gomp_task_icv *icv;
unsigned threads_requested, max_num_threads, num_threads;
unsigned long remaining;
icv = gomp_icv (false);
if (specified == 1)
return 1;
else if (thread->ts.active_level >= 1 && !icv->nest_var)
return 1;
else if (thread->ts.active_level >= gomp_max_active_levels_var)
return 1;
/* If NUM_THREADS not specified, use nthreads_var. */
if (specified == 0)
threads_requested = icv->nthreads_var;
else
threads_requested = specified;
max_num_threads = threads_requested;
/* If dynamic threads are enabled, bound the number of threads
that we launch. */
if (icv->dyn_var)
{
unsigned dyn = gomp_dynamic_max_threads ();
if (dyn < max_num_threads)
max_num_threads = dyn;
/* Optimization for parallel sections. */
if (count && count < max_num_threads)
max_num_threads = count;
}
/* ULONG_MAX stands for infinity. */
if (__builtin_expect (gomp_thread_limit_var == ULONG_MAX, 1)
|| max_num_threads == 1)
return max_num_threads;
#ifdef HAVE_SYNC_BUILTINS
do
{
remaining = gomp_remaining_threads_count;
num_threads = max_num_threads;
if (num_threads > remaining)
num_threads = remaining + 1;
}
while (__sync_val_compare_and_swap (&gomp_remaining_threads_count,
remaining, remaining - num_threads + 1)
!= remaining);
#else
gomp_mutex_lock (&gomp_remaining_threads_lock);
num_threads = max_num_threads;
remaining = gomp_remaining_threads_count;
if (num_threads > remaining)
num_threads = remaining + 1;
gomp_remaining_threads_count -= num_threads - 1;
gomp_mutex_unlock (&gomp_remaining_threads_lock);
#endif
return num_threads;
}
void
GOMP_parallel_start (void (*fn) (void *), void *data, unsigned num_threads)
{
num_threads = gomp_resolve_num_threads (num_threads, 0);
gomp_team_start (fn, data, num_threads, gomp_new_team (num_threads));
}
void
GOMP_parallel_end (void)
{
if (__builtin_expect (gomp_thread_limit_var != ULONG_MAX, 0))
{
struct gomp_thread *thr = gomp_thread ();
struct gomp_team *team = thr->ts.team;
if (team && team->nthreads > 1)
{
#ifdef HAVE_SYNC_BUILTINS
__sync_fetch_and_add (&gomp_remaining_threads_count,
1UL - team->nthreads);
#else
gomp_mutex_lock (&gomp_remaining_threads_lock);
gomp_remaining_threads_count -= team->nthreads - 1;
gomp_mutex_unlock (&gomp_remaining_threads_lock);
#endif
}
}
gomp_team_end ();
}
/* The public OpenMP API for thread and team related inquiries. */
int
omp_get_num_threads (void)
{
struct gomp_team *team = gomp_thread ()->ts.team;
return team ? team->nthreads : 1;
}
int
omp_get_thread_num (void)
{
return gomp_thread ()->ts.team_id;
}
/* This wasn't right for OpenMP 2.5. Active region used to be non-zero
when the IF clause doesn't evaluate to false, starting with OpenMP 3.0
it is non-zero with more than one thread in the team. */
int
omp_in_parallel (void)
{
return gomp_thread ()->ts.active_level > 0;
}
int
omp_get_level (void)
{
return gomp_thread ()->ts.level;
}
int
omp_get_ancestor_thread_num (int level)
{
struct gomp_team_state *ts = &gomp_thread ()->ts;
if (level < 0 || level > ts->level)
return -1;
for (level = ts->level - level; level > 0; --level)
ts = &ts->team->prev_ts;
return ts->team_id;
}
int
omp_get_team_size (int level)
{
struct gomp_team_state *ts = &gomp_thread ()->ts;
if (level < 0 || level > ts->level)
return -1;
for (level = ts->level - level; level > 0; --level)
ts = &ts->team->prev_ts;
if (ts->team == NULL)
return 1;
else
return ts->team->nthreads;
}
int
omp_get_active_level (void)
{
return gomp_thread ()->ts.active_level;
}
ialias (omp_get_num_threads)
ialias (omp_get_thread_num)
ialias (omp_in_parallel)
ialias (omp_get_level)
ialias (omp_get_ancestor_thread_num)
ialias (omp_get_team_size)
ialias (omp_get_active_level)
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