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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.5.1/] [libgomp/] [config/] [linux/] [affinity.c] - Rev 283
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/* Copyright (C) 2006, 2007, 2008, 2009, 2010 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 is a Linux specific implementation of a CPU affinity setting. */ #ifndef _GNU_SOURCE #define _GNU_SOURCE 1 #endif #include "libgomp.h" #include <sched.h> #include <stdlib.h> #include <unistd.h> #ifdef HAVE_PTHREAD_AFFINITY_NP static unsigned int affinity_counter; void gomp_init_affinity (void) { cpu_set_t cpuset, cpusetnew; size_t idx, widx; unsigned long cpus = 0; if (pthread_getaffinity_np (pthread_self (), sizeof (cpuset), &cpuset)) { gomp_error ("could not get CPU affinity set"); free (gomp_cpu_affinity); gomp_cpu_affinity = NULL; gomp_cpu_affinity_len = 0; return; } CPU_ZERO (&cpusetnew); for (widx = idx = 0; idx < gomp_cpu_affinity_len; idx++) if (gomp_cpu_affinity[idx] < CPU_SETSIZE && CPU_ISSET (gomp_cpu_affinity[idx], &cpuset)) { if (! CPU_ISSET (gomp_cpu_affinity[idx], &cpusetnew)) { cpus++; CPU_SET (gomp_cpu_affinity[idx], &cpusetnew); } gomp_cpu_affinity[widx++] = gomp_cpu_affinity[idx]; } if (widx == 0) { gomp_error ("no CPUs left for affinity setting"); free (gomp_cpu_affinity); gomp_cpu_affinity = NULL; gomp_cpu_affinity_len = 0; return; } gomp_cpu_affinity_len = widx; if (cpus < gomp_available_cpus) gomp_available_cpus = cpus; CPU_ZERO (&cpuset); CPU_SET (gomp_cpu_affinity[0], &cpuset); pthread_setaffinity_np (pthread_self (), sizeof (cpuset), &cpuset); affinity_counter = 1; } void gomp_init_thread_affinity (pthread_attr_t *attr) { unsigned int cpu; cpu_set_t cpuset; cpu = __sync_fetch_and_add (&affinity_counter, 1); cpu %= gomp_cpu_affinity_len; CPU_ZERO (&cpuset); CPU_SET (gomp_cpu_affinity[cpu], &cpuset); pthread_attr_setaffinity_np (attr, sizeof (cpu_set_t), &cpuset); } #else #include "../posix/affinity.c" #endif
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