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1 /* Copyright (C) 2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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2 Contributed by Jakub Jelinek <jakub@redhat.com>.
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3
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4 This file is part of the GNU OpenMP Library (libgomp).
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5
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6 Libgomp is free software; you can redistribute it and/or modify it
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7 under the terms of the GNU General Public License as published by
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8 the Free Software Foundation; either version 3, or (at your option)
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9 any later version.
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10
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11 Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY
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12 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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13 FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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14 more details.
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15
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16 Under Section 7 of GPL version 3, you are granted additional
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17 permissions described in the GCC Runtime Library Exception, version
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18 3.1, as published by the Free Software Foundation.
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19
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20 You should have received a copy of the GNU General Public License and
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21 a copy of the GCC Runtime Library Exception along with this program;
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22 see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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23 <http://www.gnu.org/licenses/>. */
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24
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25 /* This is a Linux specific implementation of a CPU affinity setting. */
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26
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27 #ifndef _GNU_SOURCE
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28 #define _GNU_SOURCE 1
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29 #endif
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30 #include "libgomp.h"
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31 #include <sched.h>
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32 #include <stdlib.h>
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33 #include <unistd.h>
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34
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35 #ifdef HAVE_PTHREAD_AFFINITY_NP
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36
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37 static unsigned int affinity_counter;
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38
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39 void
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40 gomp_init_affinity (void)
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41 {
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42 cpu_set_t cpuset;
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43 size_t idx, widx;
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44
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45 if (pthread_getaffinity_np (pthread_self (), sizeof (cpuset), &cpuset))
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46 {
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47 gomp_error ("could not get CPU affinity set");
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48 free (gomp_cpu_affinity);
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49 gomp_cpu_affinity = NULL;
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50 gomp_cpu_affinity_len = 0;
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51 return;
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52 }
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53
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54 for (widx = idx = 0; idx < gomp_cpu_affinity_len; idx++)
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55 if (gomp_cpu_affinity[idx] < CPU_SETSIZE
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56 && CPU_ISSET (gomp_cpu_affinity[idx], &cpuset))
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57 gomp_cpu_affinity[widx++] = gomp_cpu_affinity[idx];
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58
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59 if (widx == 0)
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60 {
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61 gomp_error ("no CPUs left for affinity setting");
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62 free (gomp_cpu_affinity);
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63 gomp_cpu_affinity = NULL;
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64 gomp_cpu_affinity_len = 0;
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65 return;
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66 }
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67
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68 gomp_cpu_affinity_len = widx;
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69 CPU_ZERO (&cpuset);
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70 CPU_SET (gomp_cpu_affinity[0], &cpuset);
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71 pthread_setaffinity_np (pthread_self (), sizeof (cpuset), &cpuset);
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72 affinity_counter = 1;
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73 }
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74
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75 void
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76 gomp_init_thread_affinity (pthread_attr_t *attr)
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77 {
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78 unsigned int cpu;
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79 cpu_set_t cpuset;
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80
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81 cpu = __sync_fetch_and_add (&affinity_counter, 1);
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82 cpu %= gomp_cpu_affinity_len;
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83 CPU_ZERO (&cpuset);
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84 CPU_SET (gomp_cpu_affinity[cpu], &cpuset);
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85 pthread_attr_setaffinity_np (attr, sizeof (cpu_set_t), &cpuset);
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86 }
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87
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88 #else
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89
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90 #include "../posix/affinity.c"
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91
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92 #endif
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