| /* 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)) |
| { |
| unsigned 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) |