PATCH/libgomp] Committed: Provide win32-specific omp_get_num_proc

[Danny Smith <dannysmith at clear dot net dot nz>]

Hello, 

I have added config/mingw32/proc.c to libgomp to allow omp_get_num_procs
and related to work on win32 host.
Danny

2007-09-10  Danny Smith  <dannysmith@users.sourceforge.net>

	* config/mingw32/proc.c: New file.

Index: config/mingw32/proc.c
===================================================================
--- config/mingw32/proc.c	(revision 0)
+++ config/mingw32/proc.c	(revision 0)
@@ -0,0 +1,85 @@
+/* Copyright (C) 2007 Free Software Foundation, Inc.
+   Contributed by Danny Smith <dannysmith@users.sourceforge.net>
+
+   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 contains system specific routines related to counting
+   online processors and dynamic load balancing.  It is expected that
+   a system may well want to write special versions of each of these.
+
+   The following implementation uses win32 API routines.  */
+
+#include "libgomp.h"
+#include <windows.h>
+
+
+/* Count the CPU's currently available to this process.  */
+static int
+count_avail_process_cpus ()
+{
+  DWORD_PTR process_cpus;
+  DWORD_PTR system_cpus;
+
+  if (GetProcessAffinityMask (GetCurrentProcess (),
+			      &process_cpus, &system_cpus))
+    {
+      int count;
+      for (count = 0; process_cpus != 0; process_cpus >>= 1)  
+	if (process_cpus & 1)
+	  count++;
+      return count;
+    }
+  return 1;
+}
+
+
+/* At startup, determine the default number of threads.  It would seem
+   this should be related to the number of cpus available to the
process.  */
+
+void
+gomp_init_num_threads (void)
+{
+  gomp_nthreads_var = count_avail_process_cpus ();
+}
+
+/* When OMP_DYNAMIC is set, at thread launch determine the number of
+   threads we should spawn for this team.  FIXME:  How do we adjust for
+   load average on MS Windows?  */
+
+unsigned
+gomp_dynamic_max_threads (void)
+{
+  int n_onln = count_avail_process_cpus();
+  return n_onln > gomp_nthreads_var ? gomp_nthreads_var : n_onln;
+}
+
+
+int
+omp_get_num_procs (void)
+{
+  return count_avail_process_cpus ();
+}
+
+ialias (omp_get_num_procs)