1 files changed, 159 insertions, 0 deletions
diff --git a/libgomp/sections.c b/libgomp/sections.c
new file mode 100644
index 000000000..c7f49b7c3
--- /dev/null
+++ b/libgomp/sections.c
@@ -0,0 +1,159 @@
+/* Copyright (C) 2005, 2007, 2008, 2009, 2010 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 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 + 1L;
+  ws->incr = 1;
+  ws->next = 1;
+#ifdef HAVE_SYNC_BUILTINS
+  /* Prepare things to make each iteration faster.  */
+  if (sizeof (long) > sizeof (unsigned))
+    ws->mode = 1;
+  else
+    {
+      struct gomp_thread *thr = gomp_thread ();
+      struct gomp_team *team = thr->ts.team;
+      long nthreads = team ? team->nthreads : 1;
+
+      ws->mode = ((nthreads | ws->end)
+		  < 1UL << (sizeof (long) * __CHAR_BIT__ / 2 - 1));
+    }
+#else
+  ws->mode = 0;
+#endif
+}
+
+/* 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);
+      gomp_work_share_init_done ();
+    }
+
+#ifdef HAVE_SYNC_BUILTINS
+  if (gomp_iter_dynamic_next (&s, &e))
+    ret = s;
+  else
+    ret = 0;
+#else
+  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);
+#endif
+
+  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)
+{
+  long s, e, ret;
+
+#ifdef HAVE_SYNC_BUILTINS
+  if (gomp_iter_dynamic_next (&s, &e))
+    ret = s;
+  else
+    ret = 0;
+#else
+  struct gomp_thread *thr = gomp_thread ();
+
+  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);
+#endif
+
+  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_team *team;
+
+  num_threads = gomp_resolve_num_threads (num_threads, count);
+  team = gomp_new_team (num_threads);
+  gomp_sections_init (&team->work_shares[0], count);
+  gomp_team_start (fn, data, num_threads, team);
+}
+
+/* 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 ();
+}