* libgomp.h (gomp_cpu_affinity, gomp_cpu_affinity_len): New extern

	decls.
	(gomp_init_affinity, gomp_init_thread_affinity): New prototypes.
	* env.c (gomp_cpu_affinity, gomp_cpu_affinity_len): New variables.
	(parse_affinity): New function.
	(initialize_env): Call it and gomp_init_affinity.
	* team.c (gomp_team_start): If gomp_cpu_affinity != NULL,
	create new pthread_attr_t and call gomp_init_thread_affinity
	on it for each thread before passing the attribute to pthread_create.
	* config/linux/affinity.c: New file.
	* config/posix/affinity.c: New file.
	* configure.ac (HAVE_PTHREAD_AFFINITY_NP): New test.
	* configure: Rebuilt.
	* config.h.in: Rebuilt.
	* Makefile.am (libgomp_la_SOURCES): Add affinity.c.
	* Makefile.in: Rebuilt.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@123494 138bc75d-0d04-0410-961f-82ee72b054a4

1 files changed, 107 insertions, 0 deletions

diff --git a/libgomp/config/linux/affinity.c b/libgomp/config/linux/affinity.c
new file mode 100644
index 00000000000..8fcce5f3a5b
--- /dev/null
+++ b/libgomp/config/linux/affinity.c
@@ -0,0 +1,107 @@
+/* Copyright (C) 2006, 2007 Free Software Foundation, Inc.
+   Contributed by Jakub Jelinek <jakub@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 is a Linux specific implementation of a CPU affinity setting.  */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+#include "libgomp.h"
+#include <sched.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#ifdef HAVE_PTHREAD_AFFINITY_NP
+
+static unsigned int affinity_counter;
+#ifndef HAVE_SYNC_BUILTINS
+static gomp_mutex_t affinity_lock;
+#endif
+
+void
+gomp_init_affinity (void)
+{
+  cpu_set_t cpuset;
+  size_t idx, widx;
+
+  if (pthread_getaffinity_np (pthread_self (), sizeof (cpuset), &cpuset))
+    {
+      gomp_error ("could not get CPU affinity set");
+      free (gomp_cpu_affinity);
+      gomp_cpu_affinity = NULL;
+      gomp_cpu_affinity_len = 0;
+      return;
+    }
+
+  for (widx = idx = 0; idx < gomp_cpu_affinity_len; idx++)
+    if (gomp_cpu_affinity[idx] < CPU_SETSIZE
+        && CPU_ISSET (gomp_cpu_affinity[idx], &cpuset))
+      gomp_cpu_affinity[widx++] = gomp_cpu_affinity[idx];
+
+  if (widx == 0)
+    {
+      gomp_error ("no CPUs left for affinity setting");
+      free (gomp_cpu_affinity);
+      gomp_cpu_affinity = NULL;
+      gomp_cpu_affinity_len = 0;
+      return;
+    }
+
+  gomp_cpu_affinity_len = widx;
+  CPU_ZERO (&cpuset);
+  CPU_SET (gomp_cpu_affinity[0], &cpuset);
+  pthread_setaffinity_np (pthread_self (), sizeof (cpuset), &cpuset);
+  affinity_counter = 1;
+#ifndef HAVE_SYNC_BUILTINS
+  gomp_mutex_init (&affinity_lock);
+#endif
+}
+
+void
+gomp_init_thread_affinity (pthread_attr_t *attr)
+{
+  unsigned int cpu;
+  cpu_set_t cpuset;
+
+#ifdef HAVE_SYNC_BUILTINS
+  cpu = __sync_fetch_and_add (&affinity_counter, 1);
+#else
+  gomp_mutex_lock (&affinity_lock);
+  cpu = affinity_counter++;
+  gomp_mutex_unlock (&affinity_lock);
+#endif
+  cpu %= gomp_cpu_affinity_len;
+  CPU_ZERO (&cpuset);
+  CPU_SET (gomp_cpu_affinity[cpu], &cpuset);
+  pthread_attr_setaffinity_np (attr, sizeof (cpu_set_t), &cpuset);
+}
+
+#else
+
+#include "../posix/affinity.c"
+
+#endif