nptl/pthread_attr_setaffinity.c

   1 /* Copyright (C) 2003-2015 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 #include <check-cpuset.h>
  27
  28
  29 int
  30 __pthread_attr_setaffinity_new (pthread_attr_t *attr, size_t cpusetsize,
  31                                 const cpu_set_t *cpuset)
  32 {
  33   struct pthread_attr *iattr;
  34
  35   assert (sizeof (*attr) >= sizeof (struct pthread_attr));
  36   iattr = (struct pthread_attr *) attr;
  37
  38   if (cpuset == NULL || cpusetsize == 0)
  39     {
  40       free (iattr->cpuset);
  41       iattr->cpuset = NULL;
  42       iattr->cpusetsize = 0;
  43     }
  44   else
  45     {
  46       int ret = check_cpuset_attr (cpuset, cpusetsize);
  47
  48       if (ret)
  49         return ret;
  50
  51       if (iattr->cpusetsize != cpusetsize)
  52         {
  53           void *newp = (cpu_set_t *) realloc (iattr->cpuset, cpusetsize);
  54           if (newp == NULL)
  55             return ENOMEM;
  56
  57           iattr->cpuset = newp;
  58           iattr->cpusetsize = cpusetsize;
  59         }
  60
  61       memcpy (iattr->cpuset, cpuset, cpusetsize);
  62     }
  63
  64   return 0;
  65 }
  66 versioned_symbol (libpthread, __pthread_attr_setaffinity_new,
  67                   pthread_attr_setaffinity_np, GLIBC_2_3_4);
  68
  69
  70 #if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
  71 int
  72 __pthread_attr_setaffinity_old (pthread_attr_t *attr, cpu_set_t *cpuset)
  73 {
  74   /* The old interface by default assumed a 1024 processor bitmap.  */
  75   return __pthread_attr_setaffinity_new (attr, 128, cpuset);
  76 }
  77 compat_symbol (libpthread, __pthread_attr_setaffinity_old,
  78                pthread_attr_setaffinity_np, GLIBC_2_3_3);
  79 #endif