554 lines
16 KiB
C
554 lines
16 KiB
C
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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 LOOP (FOR/DO) construct. */
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#include "libgomp.h"
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#include <stdlib.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_loop_init (struct gomp_work_share *ws, long start, long end, long incr,
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enum gomp_schedule_type sched, long chunk_size)
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{
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ws->sched = sched;
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ws->chunk_size = chunk_size;
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/* Canonicalize loops that have zero iterations to ->next == ->end. */
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ws->end = ((incr > 0 && start > end) || (incr < 0 && start < end))
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? start : end;
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ws->incr = incr;
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ws->next = start;
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}
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/* The *_start routines are called when first encountering a loop 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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START, END, INCR are the bounds of the loop; due to the restrictions of
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OpenMP, these values must be the same in every thread. This is not
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verified (nor is it entirely verifiable, since START is not necessarily
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retained intact in the work-share data structure). CHUNK_SIZE is the
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scheduling parameter; again this must be identical in all threads.
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Returns true if there's any work for this thread to perform. If so,
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*ISTART and *IEND are filled with the bounds of the iteration block
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allocated to this thread. Returns false if all work was assigned to
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other threads prior to this thread's arrival. */
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static bool
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gomp_loop_static_start (long start, long end, long incr, long chunk_size,
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long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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if (gomp_work_share_start (false))
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gomp_loop_init (thr->ts.work_share, start, end, incr,
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GFS_STATIC, chunk_size);
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return !gomp_iter_static_next (istart, iend);
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}
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static bool
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gomp_loop_dynamic_start (long start, long end, long incr, long chunk_size,
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long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (false))
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gomp_loop_init (thr->ts.work_share, start, end, incr,
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GFS_DYNAMIC, chunk_size);
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#ifdef HAVE_SYNC_BUILTINS
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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ret = gomp_iter_dynamic_next (istart, iend);
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#else
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ret = gomp_iter_dynamic_next_locked (istart, iend);
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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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static bool
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gomp_loop_guided_start (long start, long end, long incr, long chunk_size,
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long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (false))
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gomp_loop_init (thr->ts.work_share, start, end, incr,
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GFS_GUIDED, chunk_size);
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#ifdef HAVE_SYNC_BUILTINS
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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ret = gomp_iter_guided_next (istart, iend);
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#else
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ret = gomp_iter_guided_next_locked (istart, iend);
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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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bool
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GOMP_loop_runtime_start (long start, long end, long incr,
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long *istart, long *iend)
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{
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switch (gomp_run_sched_var)
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{
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case GFS_STATIC:
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return gomp_loop_static_start (start, end, incr, gomp_run_sched_chunk,
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istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_dynamic_start (start, end, incr, gomp_run_sched_chunk,
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istart, iend);
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case GFS_GUIDED:
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return gomp_loop_guided_start (start, end, incr, gomp_run_sched_chunk,
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istart, iend);
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default:
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abort ();
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}
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}
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/* The *_ordered_*_start routines are similar. The only difference is that
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this work-share construct is initialized to expect an ORDERED section. */
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static bool
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gomp_loop_ordered_static_start (long start, long end, long incr,
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long chunk_size, long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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if (gomp_work_share_start (true))
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{
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gomp_loop_init (thr->ts.work_share, start, end, incr,
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GFS_STATIC, chunk_size);
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gomp_ordered_static_init ();
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}
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return !gomp_iter_static_next (istart, iend);
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}
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static bool
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gomp_loop_ordered_dynamic_start (long start, long end, long incr,
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long chunk_size, long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (true))
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gomp_loop_init (thr->ts.work_share, start, end, incr,
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GFS_DYNAMIC, chunk_size);
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ret = gomp_iter_dynamic_next_locked (istart, iend);
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if (ret)
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gomp_ordered_first ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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static bool
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gomp_loop_ordered_guided_start (long start, long end, long incr,
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long chunk_size, long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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if (gomp_work_share_start (true))
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gomp_loop_init (thr->ts.work_share, start, end, incr,
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GFS_GUIDED, chunk_size);
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ret = gomp_iter_guided_next_locked (istart, iend);
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if (ret)
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gomp_ordered_first ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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bool
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GOMP_loop_ordered_runtime_start (long start, long end, long incr,
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long *istart, long *iend)
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{
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switch (gomp_run_sched_var)
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{
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case GFS_STATIC:
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return gomp_loop_ordered_static_start (start, end, incr,
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gomp_run_sched_chunk,
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istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_ordered_dynamic_start (start, end, incr,
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gomp_run_sched_chunk,
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istart, iend);
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case GFS_GUIDED:
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return gomp_loop_ordered_guided_start (start, end, incr,
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gomp_run_sched_chunk,
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istart, iend);
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default:
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abort ();
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}
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}
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/* The *_next routines are called when the thread completes processing of
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the iteration block currently assigned to it. If the work-share
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construct is bound directly to a parallel construct, then the iteration
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bounds may have been set up before the parallel. In which case, this
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may be the first iteration for the thread.
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Returns true if there is work remaining to be performed; *ISTART and
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*IEND are filled with a new iteration block. Returns false if all work
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has been assigned. */
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static bool
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gomp_loop_static_next (long *istart, long *iend)
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{
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return !gomp_iter_static_next (istart, iend);
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}
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static bool
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gomp_loop_dynamic_next (long *istart, long *iend)
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{
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bool ret;
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#ifdef HAVE_SYNC_BUILTINS
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ret = gomp_iter_dynamic_next (istart, iend);
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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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ret = gomp_iter_dynamic_next_locked (istart, iend);
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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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static bool
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gomp_loop_guided_next (long *istart, long *iend)
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{
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bool ret;
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#ifdef HAVE_SYNC_BUILTINS
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ret = gomp_iter_guided_next (istart, iend);
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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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ret = gomp_iter_guided_next_locked (istart, iend);
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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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bool
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GOMP_loop_runtime_next (long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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switch (thr->ts.work_share->sched)
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{
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case GFS_STATIC:
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return gomp_loop_static_next (istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_dynamic_next (istart, iend);
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case GFS_GUIDED:
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return gomp_loop_guided_next (istart, iend);
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default:
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abort ();
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}
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}
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/* The *_ordered_*_next routines are called when the thread completes
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processing of the iteration block currently assigned to it.
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Returns true if there is work remaining to be performed; *ISTART and
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*IEND are filled with a new iteration block. Returns false if all work
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has been assigned. */
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static bool
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gomp_loop_ordered_static_next (long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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int test;
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gomp_ordered_sync ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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test = gomp_iter_static_next (istart, iend);
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if (test >= 0)
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gomp_ordered_static_next ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return test == 0;
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}
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static bool
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gomp_loop_ordered_dynamic_next (long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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gomp_ordered_sync ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_dynamic_next_locked (istart, iend);
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if (ret)
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gomp_ordered_next ();
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else
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gomp_ordered_last ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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static bool
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gomp_loop_ordered_guided_next (long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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bool ret;
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gomp_ordered_sync ();
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gomp_mutex_lock (&thr->ts.work_share->lock);
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ret = gomp_iter_guided_next_locked (istart, iend);
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if (ret)
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gomp_ordered_next ();
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else
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gomp_ordered_last ();
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gomp_mutex_unlock (&thr->ts.work_share->lock);
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return ret;
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}
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bool
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GOMP_loop_ordered_runtime_next (long *istart, long *iend)
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{
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struct gomp_thread *thr = gomp_thread ();
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switch (thr->ts.work_share->sched)
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{
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case GFS_STATIC:
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return gomp_loop_ordered_static_next (istart, iend);
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case GFS_DYNAMIC:
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return gomp_loop_ordered_dynamic_next (istart, iend);
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case GFS_GUIDED:
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return gomp_loop_ordered_guided_next (istart, iend);
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default:
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abort ();
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}
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}
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/* The GOMP_parallel_loop_* routines pre-initialize a work-share construct
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to avoid one synchronization once we get into the loop. */
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static void
|
||
|
|
gomp_parallel_loop_start (void (*fn) (void *), void *data,
|
||
|
|
unsigned num_threads, long start, long end,
|
||
|
|
long incr, enum gomp_schedule_type sched,
|
||
|
|
long chunk_size)
|
||
|
|
{
|
||
|
|
struct gomp_work_share *ws;
|
||
|
|
|
||
|
|
num_threads = gomp_resolve_num_threads (num_threads);
|
||
|
|
ws = gomp_new_work_share (false, num_threads);
|
||
|
|
gomp_loop_init (ws, start, end, incr, sched, chunk_size);
|
||
|
|
gomp_team_start (fn, data, num_threads, ws);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
GOMP_parallel_loop_static_start (void (*fn) (void *), void *data,
|
||
|
|
unsigned num_threads, long start, long end,
|
||
|
|
long incr, long chunk_size)
|
||
|
|
{
|
||
|
|
gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
|
||
|
|
GFS_STATIC, chunk_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
GOMP_parallel_loop_dynamic_start (void (*fn) (void *), void *data,
|
||
|
|
unsigned num_threads, long start, long end,
|
||
|
|
long incr, long chunk_size)
|
||
|
|
{
|
||
|
|
gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
|
||
|
|
GFS_DYNAMIC, chunk_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
GOMP_parallel_loop_guided_start (void (*fn) (void *), void *data,
|
||
|
|
unsigned num_threads, long start, long end,
|
||
|
|
long incr, long chunk_size)
|
||
|
|
{
|
||
|
|
gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
|
||
|
|
GFS_GUIDED, chunk_size);
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
GOMP_parallel_loop_runtime_start (void (*fn) (void *), void *data,
|
||
|
|
unsigned num_threads, long start, long end,
|
||
|
|
long incr)
|
||
|
|
{
|
||
|
|
gomp_parallel_loop_start (fn, data, num_threads, start, end, incr,
|
||
|
|
gomp_run_sched_var, gomp_run_sched_chunk);
|
||
|
|
}
|
||
|
|
|
||
|
|
/* The GOMP_loop_end* routines are called after the thread is told that
|
||
|
|
all loop iterations are complete. This first version synchronizes
|
||
|
|
all threads; the nowait version does not. */
|
||
|
|
|
||
|
|
void
|
||
|
|
GOMP_loop_end (void)
|
||
|
|
{
|
||
|
|
gomp_work_share_end ();
|
||
|
|
}
|
||
|
|
|
||
|
|
void
|
||
|
|
GOMP_loop_end_nowait (void)
|
||
|
|
{
|
||
|
|
gomp_work_share_end_nowait ();
|
||
|
|
}
|
||
|
|
|
||
|
|
|
||
|
|
/* We use static functions above so that we're sure that the "runtime"
|
||
|
|
function can defer to the proper routine without interposition. We
|
||
|
|
export the static function with a strong alias when possible, or with
|
||
|
|
a wrapper function otherwise. */
|
||
|
|
|
||
|
|
#ifdef HAVE_ATTRIBUTE_ALIAS
|
||
|
|
extern __typeof(gomp_loop_static_start) GOMP_loop_static_start
|
||
|
|
__attribute__((alias ("gomp_loop_static_start")));
|
||
|
|
extern __typeof(gomp_loop_dynamic_start) GOMP_loop_dynamic_start
|
||
|
|
__attribute__((alias ("gomp_loop_dynamic_start")));
|
||
|
|
extern __typeof(gomp_loop_guided_start) GOMP_loop_guided_start
|
||
|
|
__attribute__((alias ("gomp_loop_guided_start")));
|
||
|
|
|
||
|
|
extern __typeof(gomp_loop_ordered_static_start) GOMP_loop_ordered_static_start
|
||
|
|
__attribute__((alias ("gomp_loop_ordered_static_start")));
|
||
|
|
extern __typeof(gomp_loop_ordered_dynamic_start) GOMP_loop_ordered_dynamic_start
|
||
|
|
__attribute__((alias ("gomp_loop_ordered_dynamic_start")));
|
||
|
|
extern __typeof(gomp_loop_ordered_guided_start) GOMP_loop_ordered_guided_start
|
||
|
|
__attribute__((alias ("gomp_loop_ordered_guided_start")));
|
||
|
|
|
||
|
|
extern __typeof(gomp_loop_static_next) GOMP_loop_static_next
|
||
|
|
__attribute__((alias ("gomp_loop_static_next")));
|
||
|
|
extern __typeof(gomp_loop_dynamic_next) GOMP_loop_dynamic_next
|
||
|
|
__attribute__((alias ("gomp_loop_dynamic_next")));
|
||
|
|
extern __typeof(gomp_loop_guided_next) GOMP_loop_guided_next
|
||
|
|
__attribute__((alias ("gomp_loop_guided_next")));
|
||
|
|
|
||
|
|
extern __typeof(gomp_loop_ordered_static_next) GOMP_loop_ordered_static_next
|
||
|
|
__attribute__((alias ("gomp_loop_ordered_static_next")));
|
||
|
|
extern __typeof(gomp_loop_ordered_dynamic_next) GOMP_loop_ordered_dynamic_next
|
||
|
|
__attribute__((alias ("gomp_loop_ordered_dynamic_next")));
|
||
|
|
extern __typeof(gomp_loop_ordered_guided_next) GOMP_loop_ordered_guided_next
|
||
|
|
__attribute__((alias ("gomp_loop_ordered_guided_next")));
|
||
|
|
#else
|
||
|
|
bool
|
||
|
|
GOMP_loop_static_start (long start, long end, long incr, long chunk_size,
|
||
|
|
long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_static_start (start, end, incr, chunk_size, istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_dynamic_start (long start, long end, long incr, long chunk_size,
|
||
|
|
long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_dynamic_start (start, end, incr, chunk_size, istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_guided_start (long start, long end, long incr, long chunk_size,
|
||
|
|
long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_guided_start (start, end, incr, chunk_size, istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_ordered_static_start (long start, long end, long incr,
|
||
|
|
long chunk_size, long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_ordered_static_start (start, end, incr, chunk_size,
|
||
|
|
istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_ordered_dynamic_start (long start, long end, long incr,
|
||
|
|
long chunk_size, long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_ordered_dynamic_start (start, end, incr, chunk_size,
|
||
|
|
istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_ordered_guided_start (long start, long end, long incr,
|
||
|
|
long chunk_size, long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_ordered_guided_start (start, end, incr, chunk_size,
|
||
|
|
istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_static_next (long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_static_next (istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_dynamic_next (long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_dynamic_next (istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_guided_next (long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_guided_next (istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_ordered_static_next (long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_ordered_static_next (istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_ordered_dynamic_next (long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_ordered_dynamic_next (istart, iend);
|
||
|
|
}
|
||
|
|
|
||
|
|
bool
|
||
|
|
GOMP_loop_ordered_guided_next (long *istart, long *iend)
|
||
|
|
{
|
||
|
|
return gomp_loop_ordered_guided_next (istart, iend);
|
||
|
|
}
|
||
|
|
#endif
|