104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* Copyright (C) 2006, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Contributed by Jakub Jelinek <jakub@redhat.com>.
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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 is a Linux specific implementation of a CPU affinity setting. */
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE 1
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#endif
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#include "libgomp.h"
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#include <sched.h>
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#include <stdlib.h>
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#include <unistd.h>
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#ifdef HAVE_PTHREAD_AFFINITY_NP
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static unsigned int affinity_counter;
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void
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gomp_init_affinity (void)
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{
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cpu_set_t cpuset, cpusetnew;
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size_t idx, widx;
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unsigned long cpus = 0;
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if (pthread_getaffinity_np (pthread_self (), sizeof (cpuset), &cpuset))
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{
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gomp_error ("could not get CPU affinity set");
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free (gomp_cpu_affinity);
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gomp_cpu_affinity = NULL;
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gomp_cpu_affinity_len = 0;
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return;
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}
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CPU_ZERO (&cpusetnew);
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for (widx = idx = 0; idx < gomp_cpu_affinity_len; idx++)
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if (gomp_cpu_affinity[idx] < CPU_SETSIZE
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&& CPU_ISSET (gomp_cpu_affinity[idx], &cpuset))
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{
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if (! CPU_ISSET (gomp_cpu_affinity[idx], &cpusetnew))
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{
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cpus++;
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CPU_SET (gomp_cpu_affinity[idx], &cpusetnew);
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}
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gomp_cpu_affinity[widx++] = gomp_cpu_affinity[idx];
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}
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if (widx == 0)
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{
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gomp_error ("no CPUs left for affinity setting");
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free (gomp_cpu_affinity);
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gomp_cpu_affinity = NULL;
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gomp_cpu_affinity_len = 0;
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return;
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}
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gomp_cpu_affinity_len = widx;
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if (cpus < gomp_available_cpus)
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gomp_available_cpus = cpus;
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CPU_ZERO (&cpuset);
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CPU_SET (gomp_cpu_affinity[0], &cpuset);
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pthread_setaffinity_np (pthread_self (), sizeof (cpuset), &cpuset);
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affinity_counter = 1;
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}
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void
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gomp_init_thread_affinity (pthread_attr_t *attr)
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{
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unsigned int cpu;
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cpu_set_t cpuset;
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cpu = __sync_fetch_and_add (&affinity_counter, 1);
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cpu %= gomp_cpu_affinity_len;
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CPU_ZERO (&cpuset);
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CPU_SET (gomp_cpu_affinity[cpu], &cpuset);
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pthread_attr_setaffinity_np (attr, sizeof (cpu_set_t), &cpuset);
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}
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#else
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#include "../posix/affinity.c"
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#endif
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