nptl/pthread_attr_setaffinity.c

   1 /* Copyright (C) 2003-2018 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 <errno.h>
  20 #include <limits.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <pthreadP.h>
  24 #include <shlib-compat.h>
  25
  26
  27 int
  28 __pthread_attr_setaffinity_new (pthread_attr_t *attr, size_t cpusetsize,
  29                                 const cpu_set_t *cpuset)
  30 {
  31   struct pthread_attr *iattr;
  32
  33   iattr = (struct pthread_attr *) attr;
  34
  35   if (cpuset == NULL || cpusetsize == 0)
  36     {
  37       free (iattr->cpuset);
  38       iattr->cpuset = NULL;
  39       iattr->cpusetsize = 0;
  40     }
  41   else
  42     {
  43       if (iattr->cpusetsize != cpusetsize)
  44         {
  45           void *newp = (cpu_set_t *) realloc (iattr->cpuset, cpusetsize);
  46           if (newp == NULL)
  47             return ENOMEM;
  48
  49           iattr->cpuset = newp;
  50           iattr->cpusetsize = cpusetsize;
  51         }
  52
  53       memcpy (iattr->cpuset, cpuset, cpusetsize);
  54     }
  55
  56   return 0;
  57 }
  58 versioned_symbol (libpthread, __pthread_attr_setaffinity_new,
  59                   pthread_attr_setaffinity_np, GLIBC_2_3_4);
  60
  61
  62 #if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
  63 int
  64 __pthread_attr_setaffinity_old (pthread_attr_t *attr, cpu_set_t *cpuset)
  65 {
  66   /* The old interface by default assumed a 1024 processor bitmap.  */
  67   return __pthread_attr_setaffinity_new (attr, 128, cpuset);
  68 }
  69 compat_symbol (libpthread, __pthread_attr_setaffinity_old,
  70                pthread_attr_setaffinity_np, GLIBC_2_3_3);
  71 #endif