nptl/sysdeps/unix/sysv/linux/pthread_attr_setaffinity.c

   1 /* Copyright (C) 2003-2014 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <assert.h>
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <pthreadP.h>
  25 #include <shlib-compat.h>
  26
  27
  28
  29
  30 int
  31 __pthread_attr_setaffinity_new (pthread_attr_t *attr, size_t cpusetsize,
  32                                 const cpu_set_t *cpuset)
  33 {
  34   struct pthread_attr *iattr;
  35
  36   assert (sizeof (*attr) >= sizeof (struct pthread_attr));
  37   iattr = (struct pthread_attr *) attr;
  38
  39   if (cpuset == NULL || cpusetsize == 0)
  40     {
  41       free (iattr->cpuset);
  42       iattr->cpuset = NULL;
  43       iattr->cpusetsize = 0;
  44     }
  45   else
  46     {
  47       int ret = check_cpuset_attr (cpuset, cpusetsize);
  48
  49       if (ret)
  50         return ret;
  51
  52       if (iattr->cpusetsize != cpusetsize)
  53         {
  54           void *newp = (cpu_set_t *) realloc (iattr->cpuset, cpusetsize);
  55           if (newp == NULL)
  56             return ENOMEM;
  57
  58           iattr->cpuset = newp;
  59           iattr->cpusetsize = cpusetsize;
  60         }
  61
  62       memcpy (iattr->cpuset, cpuset, cpusetsize);
  63     }
  64
  65   return 0;
  66 }
  67 versioned_symbol (libpthread, __pthread_attr_setaffinity_new,
  68                   pthread_attr_setaffinity_np, GLIBC_2_3_4);
  69
  70
  71 #if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
  72 int
  73 __pthread_attr_setaffinity_old (pthread_attr_t *attr, cpu_set_t *cpuset)
  74 {
  75   /* The old interface by default assumed a 1024 processor bitmap.  */
  76   return __pthread_attr_setaffinity_new (attr, 128, cpuset);
  77 }
  78 compat_symbol (libpthread, __pthread_attr_setaffinity_old,
  79                pthread_attr_setaffinity_np, GLIBC_2_3_3);
  80 #endif