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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libgomp/] [config/] [mingw32/] [proc.c] - Rev 288
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/* Copyright (C) 2007, 2009 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 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. 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 unsigned 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_global_icv.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) { unsigned int n_onln = count_avail_process_cpus (); unsigned int nthreads_var = gomp_icv (false)->nthreads_var; return n_onln > nthreads_var ? nthreads_var : n_onln; } int omp_get_num_procs (void) { return count_avail_process_cpus (); } ialias (omp_get_num_procs)
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