Initial checkin of GCC 4.9.0 from trunk (r208799).

Change-Id: I48a3c08bb98542aa215912a75f03c0890e497dba

1 files changed, 219 insertions, 0 deletions

diff --git a/gcc-4.9/libgomp/config/linux/proc.c b/gcc-4.9/libgomp/config/linux/proc.c
new file mode 100644
index 000000000..fa89f1d15
--- /dev/null
+++ b/gcc-4.9/libgomp/config/linux/proc.c
@@ -0,0 +1,219 @@
+/* Copyright (C) 2005-2014 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 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 contains system specific routines related to counting
+   online processors and dynamic load balancing.  */
+
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE 1
+#endif
+#include "libgomp.h"
+#include "proc.h"
+#include <errno.h>
+#include <stdlib.h>
+#include <unistd.h>
+#ifdef HAVE_GETLOADAVG
+# ifdef HAVE_SYS_LOADAVG_H
+#  include <sys/loadavg.h>
+# endif
+#endif
+
+#ifdef HAVE_PTHREAD_AFFINITY_NP
+unsigned long gomp_cpuset_size;
+static unsigned long gomp_get_cpuset_size;
+cpu_set_t *gomp_cpusetp;
+
+unsigned long
+gomp_cpuset_popcount (unsigned long cpusetsize, cpu_set_t *cpusetp)
+{
+#ifdef CPU_COUNT_S
+  /* glibc 2.7 and above provide a macro for this.  */
+  return CPU_COUNT_S (cpusetsize, cpusetp);
+#else
+#ifdef CPU_COUNT
+  if (cpusetsize == sizeof (cpu_set_t))
+    /* glibc 2.6 and above provide a macro for this.  */
+    return CPU_COUNT (cpusetp);
+#endif
+  size_t i;
+  unsigned long ret = 0;
+  extern int check[sizeof (cpusetp->__bits[0]) == sizeof (unsigned long int)
+		   ? 1 : -1] __attribute__((unused));
+
+  for (i = 0; i < cpusetsize / sizeof (cpusetp->__bits[0]); i++)
+    {
+      unsigned long int mask = cpusetp->__bits[i];
+      if (mask == 0)
+	continue;
+      ret += __builtin_popcountl (mask);
+    }
+  return ret;
+#endif
+}
+#endif
+
+/* At startup, determine the default number of threads.  It would seem
+   this should be related to the number of cpus online.  */
+
+void
+gomp_init_num_threads (void)
+{
+#ifdef HAVE_PTHREAD_AFFINITY_NP
+#if defined (_SC_NPROCESSORS_CONF) && defined (CPU_ALLOC_SIZE)
+  gomp_cpuset_size = sysconf (_SC_NPROCESSORS_CONF);
+  gomp_cpuset_size = CPU_ALLOC_SIZE (gomp_cpuset_size);
+#else
+  gomp_cpuset_size = sizeof (cpu_set_t);
+#endif
+
+  gomp_cpusetp = (cpu_set_t *) gomp_malloc (gomp_cpuset_size);
+  do
+    {
+      int ret = pthread_getaffinity_np (pthread_self (), gomp_cpuset_size,
+					gomp_cpusetp);
+      if (ret == 0)
+	{
+	  /* Count only the CPUs this process can use.  */
+	  gomp_global_icv.nthreads_var
+	    = gomp_cpuset_popcount (gomp_cpuset_size, gomp_cpusetp);
+	  if (gomp_global_icv.nthreads_var == 0)
+	    break;
+	  gomp_get_cpuset_size = gomp_cpuset_size;
+#ifdef CPU_ALLOC_SIZE
+	  unsigned long i;
+	  for (i = gomp_cpuset_size * 8; i; i--)
+	    if (CPU_ISSET_S (i - 1, gomp_cpuset_size, gomp_cpusetp))
+	      break;
+	  gomp_cpuset_size = CPU_ALLOC_SIZE (i);
+#endif
+	  return;
+	}
+      if (ret != EINVAL)
+	break;
+#ifdef CPU_ALLOC_SIZE
+      if (gomp_cpuset_size < sizeof (cpu_set_t))
+	gomp_cpuset_size = sizeof (cpu_set_t);
+      else
+	gomp_cpuset_size = gomp_cpuset_size * 2;
+      if (gomp_cpuset_size < 8 * sizeof (cpu_set_t))
+	gomp_cpusetp
+	  = (cpu_set_t *) gomp_realloc (gomp_cpusetp, gomp_cpuset_size);
+      else
+	{
+	  /* Avoid gomp_fatal if too large memory allocation would be
+	     requested, e.g. kernel returning EINVAL all the time.  */
+	  void *p = realloc (gomp_cpusetp, gomp_cpuset_size);
+	  if (p == NULL)
+	    break;
+	  gomp_cpusetp = (cpu_set_t *) p;
+	}
+#else
+      break;
+#endif
+    }
+  while (1);
+  gomp_cpuset_size = 0;
+  gomp_global_icv.nthreads_var = 1;
+  free (gomp_cpusetp);
+  gomp_cpusetp = NULL;
+#endif
+#ifdef _SC_NPROCESSORS_ONLN
+  gomp_global_icv.nthreads_var = sysconf (_SC_NPROCESSORS_ONLN);
+#endif
+}
+
+static int
+get_num_procs (void)
+{
+#ifdef HAVE_PTHREAD_AFFINITY_NP
+  if (gomp_places_list == NULL)
+    {
+      /* Count only the CPUs this process can use.  */
+      if (gomp_cpusetp
+	  && pthread_getaffinity_np (pthread_self (), gomp_get_cpuset_size,
+				     gomp_cpusetp) == 0)
+	{
+	  int ret = gomp_cpuset_popcount (gomp_get_cpuset_size, gomp_cpusetp);
+	  return ret != 0 ? ret : 1;
+	}
+    }
+  else
+    {
+      /* We can't use pthread_getaffinity_np in this case
+	 (we have changed it ourselves, it binds to just one CPU).
+	 Count instead the number of different CPUs we are
+	 using.  gomp_init_affinity updated gomp_available_cpus to
+	 the number of CPUs in the GOMP_AFFINITY mask that we are
+	 allowed to use though.  */
+      return gomp_available_cpus;
+    }
+#endif
+#ifdef _SC_NPROCESSORS_ONLN
+  return sysconf (_SC_NPROCESSORS_ONLN);
+#else
+  return gomp_icv (false)->nthreads_var;
+#endif
+}
+
+/* When OMP_DYNAMIC is set, at thread launch determine the number of
+   threads we should spawn for this team.  */
+/* ??? I have no idea what best practice for this is.  Surely some
+   function of the number of processors that are *still* online and
+   the load average.  Here I use the number of processors online
+   minus the 15 minute load average.  */
+
+unsigned
+gomp_dynamic_max_threads (void)
+{
+  unsigned n_onln, loadavg, nthreads_var = gomp_icv (false)->nthreads_var;
+
+  n_onln = get_num_procs ();
+  if (n_onln > nthreads_var)
+    n_onln = nthreads_var;
+
+  loadavg = 0;
+#ifdef HAVE_GETLOADAVG
+  {
+    double dloadavg[3];
+    if (getloadavg (dloadavg, 3) == 3)
+      {
+	/* Add 0.1 to get a kind of biased rounding.  */
+	loadavg = dloadavg[2] + 0.1;
+      }
+  }
+#endif
+
+  if (loadavg >= n_onln)
+    return 1;
+  else
+    return n_onln - loadavg;
+}
+
+int
+omp_get_num_procs (void)
+{
+  return get_num_procs ();
+}
+
+ialias (omp_get_num_procs)