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+/* Copyright (C) 2005, 2007 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 Lesser General Public License as published by
+ the Free Software Foundation; either version 2.1 of the License, 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 Lesser General Public License for
+ more details.
+
+ You should have received a copy of the GNU Lesser General Public License
+ along with libgomp; see the file COPYING.LIB. If not, write to the
+ Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ MA 02110-1301, USA. */
+
+/* As a special exception, if you link this library with other files, some
+ of which are compiled with GCC, to produce an executable, this library
+ does not by itself cause the resulting executable to be covered by the
+ GNU General Public License. This exception does not however invalidate
+ any other reasons why the executable file might be covered by the GNU
+ General Public License. */
+
+/* This file handles the SECTIONS construct. */
+
+#include "libgomp.h"
+
+
+/* Initialize the given work share construct from the given arguments. */
+
+static inline void
+gomp_sections_init (struct gomp_work_share *ws, unsigned count)
+{
+ ws->sched = GFS_DYNAMIC;
+ ws->chunk_size = 1;
+ ws->end = count + 1;
+ ws->incr = 1;
+ ws->next = 1;
+}
+
+/* This routine is called when first encountering a sections construct
+ that is not bound directly to a parallel construct. The first thread
+ that arrives will create the work-share construct; subsequent threads
+ will see the construct exists and allocate work from it.
+
+ COUNT is the number of sections in this construct.
+
+ Returns the 1-based section number for this thread to perform, or 0 if
+ all work was assigned to other threads prior to this thread's arrival. */
+
+unsigned
+GOMP_sections_start (unsigned count)
+{
+ struct gomp_thread *thr = gomp_thread ();
+ long s, e, ret;
+
+ if (gomp_work_share_start (false))
+ gomp_sections_init (thr->ts.work_share, count);
+
+ if (gomp_iter_dynamic_next_locked (&s, &e))
+ ret = s;
+ else
+ ret = 0;
+
+ gomp_mutex_unlock (&thr->ts.work_share->lock);
+
+ return ret;
+}
+
+/* This routine is called when the thread completes processing of the
+ section currently assigned to it. If the work-share construct is
+ bound directly to a parallel construct, then the construct may have
+ been set up before the parallel. In which case, this may be the
+ first iteration for the thread.
+
+ Returns the 1-based section number for this thread to perform, or 0 if
+ all work was assigned to other threads prior to this thread's arrival. */
+
+unsigned
+GOMP_sections_next (void)
+{
+ struct gomp_thread *thr = gomp_thread ();
+ long s, e, ret;
+
+ gomp_mutex_lock (&thr->ts.work_share->lock);
+ if (gomp_iter_dynamic_next_locked (&s, &e))
+ ret = s;
+ else
+ ret = 0;
+ gomp_mutex_unlock (&thr->ts.work_share->lock);
+
+ return ret;
+}
+
+/* This routine pre-initializes a work-share construct to avoid one
+ synchronization once we get into the loop. */
+
+void
+GOMP_parallel_sections_start (void (*fn) (void *), void *data,
+ unsigned num_threads, unsigned count)
+{
+ struct gomp_work_share *ws;
+
+ num_threads = gomp_resolve_num_threads (num_threads);
+ if (gomp_dyn_var && num_threads > count)
+ num_threads = count;
+
+ ws = gomp_new_work_share (false, num_threads);
+ gomp_sections_init (ws, count);
+ gomp_team_start (fn, data, num_threads, ws);
+}
+
+/* The GOMP_section_end* routines are called after the thread is told
+ that all sections are complete. This first version synchronizes
+ all threads; the nowait version does not. */
+
+void
+GOMP_sections_end (void)
+{
+ gomp_work_share_end ();
+}
+
+void
+GOMP_sections_end_nowait (void)
+{
+ gomp_work_share_end_nowait ();
+}