132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/* Copyright (C) 2005, 2007 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 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 + 1;
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ws->incr = 1;
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ws->next = 1;
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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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gomp_sections_init (thr->ts.work_share, count);
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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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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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struct gomp_thread *thr = gomp_thread ();
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long s, e, ret;
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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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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_work_share *ws;
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num_threads = gomp_resolve_num_threads (num_threads);
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if (gomp_dyn_var && num_threads > count)
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num_threads = count;
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ws = gomp_new_work_share (false, num_threads);
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gomp_sections_init (ws, count);
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gomp_team_start (fn, data, num_threads, ws);
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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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