a0884cf09e
* libgomp.h (gomp_cpu_affinity, gomp_cpu_affinity_len): New extern decls. (gomp_init_affinity, gomp_init_thread_affinity): New prototypes. * env.c (gomp_cpu_affinity, gomp_cpu_affinity_len): New variables. (parse_affinity): New function. (initialize_env): Call it and gomp_init_affinity. * team.c (gomp_team_start): If gomp_cpu_affinity != NULL, create new pthread_attr_t and call gomp_init_thread_affinity on it for each thread before passing the attribute to pthread_create. * config/linux/affinity.c: New file. * config/posix/affinity.c: New file. * configure.ac (HAVE_PTHREAD_AFFINITY_NP): New test. * configure: Rebuilt. * config.h.in: Rebuilt. * Makefile.am (libgomp_la_SOURCES): Add affinity.c. * Makefile.in: Rebuilt. From-SVN: r123494
108 lines
3.1 KiB
C
108 lines
3.1 KiB
C
/* Copyright (C) 2006, 2007 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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) 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 Lesser General Public License for
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more details.
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You should have received a copy of the GNU Lesser General Public License
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along with libgomp; see the file COPYING.LIB. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
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MA 02110-1301, USA. */
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/* As a special exception, if you link this library with other files, some
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of which are compiled with GCC, to produce an executable, this library
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does not by itself cause the resulting executable to be covered by the
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GNU General Public License. This exception does not however invalidate
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any other reasons why the executable file might be covered by the GNU
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General Public License. */
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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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#ifndef HAVE_SYNC_BUILTINS
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static gomp_mutex_t affinity_lock;
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#endif
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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;
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size_t idx, widx;
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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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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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gomp_cpu_affinity[widx++] = gomp_cpu_affinity[idx];
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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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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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#ifndef HAVE_SYNC_BUILTINS
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gomp_mutex_init (&affinity_lock);
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#endif
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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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#ifdef HAVE_SYNC_BUILTINS
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cpu = __sync_fetch_and_add (&affinity_counter, 1);
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#else
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gomp_mutex_lock (&affinity_lock);
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cpu = affinity_counter++;
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gomp_mutex_unlock (&affinity_lock);
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#endif
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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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