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[/] [openrisc/] [trunk/] [gnu-stable/] [gcc-4.5.1/] [libgomp/] [config/] [mingw32/] [proc.c] - Blame information for rev 856

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1 273 jeremybenn
/* Copyright (C) 2007, 2009 Free Software Foundation, Inc.
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   Contributed by Danny Smith <dannysmith@users.sourceforge.net>
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   This file is part of the GNU OpenMP Library (libgomp).
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   Libgomp is free software; you can redistribute it and/or modify it
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   under the terms of the GNU General Public License as published by
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   the Free Software Foundation; either version 3, or (at your option)
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   any later version.
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   Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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   WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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   FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
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   more details.
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   Under Section 7 of GPL version 3, you are granted additional
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   permissions described in the GCC Runtime Library Exception, version
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   3.1, as published by the Free Software Foundation.
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   You should have received a copy of the GNU General Public License and
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   a copy of the GCC Runtime Library Exception along with this program;
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   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
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   <http://www.gnu.org/licenses/>.  */
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/* This file contains system specific routines related to counting
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   online processors and dynamic load balancing.  It is expected that
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   a system may well want to write special versions of each of these.
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   The following implementation uses win32 API routines.  */
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#include "libgomp.h"
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#include <windows.h>
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/* Count the CPU's currently available to this process.  */
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static unsigned int
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count_avail_process_cpus ()
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{
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  DWORD_PTR process_cpus;
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  DWORD_PTR system_cpus;
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  if (GetProcessAffinityMask (GetCurrentProcess (),
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                              &process_cpus, &system_cpus))
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    {
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      unsigned int count;
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      for (count = 0; process_cpus != 0; process_cpus >>= 1)
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        if (process_cpus & 1)
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          count++;
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      return count;
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    }
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  return 1;
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}
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/* At startup, determine the default number of threads.  It would seem
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   this should be related to the number of cpus available to the process.  */
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void
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gomp_init_num_threads (void)
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{
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  gomp_global_icv.nthreads_var = count_avail_process_cpus ();
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}
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/* When OMP_DYNAMIC is set, at thread launch determine the number of
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   threads we should spawn for this team.  FIXME:  How do we adjust for
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   load average on MS Windows?  */
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unsigned
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gomp_dynamic_max_threads (void)
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{
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  unsigned int n_onln = count_avail_process_cpus ();
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  unsigned int nthreads_var = gomp_icv (false)->nthreads_var;
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  return n_onln > nthreads_var ? nthreads_var : n_onln;
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}
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int
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omp_get_num_procs (void)
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{
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  return count_avail_process_cpus ();
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}
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ialias (omp_get_num_procs)

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