nptl/pthread_attr_setaffinity.c

   1 /* Copyright (C) 2003-2021 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    <https://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_np (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       if (iattr->extension != NULL)
  38         {
  39           free (iattr->extension->cpuset);
  40           iattr->extension->cpuset = NULL;
  41           iattr->extension->cpusetsize = 0;
  42         }
  43     }
  44   else
  45     {
  46       int ret = __pthread_attr_extension (iattr);
  47       if (ret != 0)
  48         return ret;
  49
  50       if (iattr->extension->cpusetsize != cpusetsize)
  51         {
  52           void *newp = realloc (iattr->extension->cpuset, cpusetsize);
  53           if (newp == NULL)
  54             return ENOMEM;
  55
  56           iattr->extension->cpuset = newp;
  57           iattr->extension->cpusetsize = cpusetsize;
  58         }
  59
  60       memcpy (iattr->extension->cpuset, cpuset, cpusetsize);
  61     }
  62
  63   return 0;
  64 }
  65 libc_hidden_def (__pthread_attr_setaffinity_np)
  66 versioned_symbol (libc, __pthread_attr_setaffinity_np,
  67                   pthread_attr_setaffinity_np, GLIBC_2_32);
  68
  69
  70 #if SHLIB_COMPAT (libc, GLIBC_2_3_4, GLIBC_2_32)
  71 /* Compat symbol with the old libc version.  */
  72 strong_alias (__pthread_attr_setaffinity_np, __pthread_attr_setaffinity_alias)
  73 compat_symbol (libc, __pthread_attr_setaffinity_alias,
  74                pthread_attr_setaffinity_np, GLIBC_2_3_4);
  75 #endif
  76
  77 #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
  78 int
  79 __pthread_attr_setaffinity_old (pthread_attr_t *attr, cpu_set_t *cpuset)
  80 {
  81   /* The old interface by default assumed a 1024 processor bitmap.  */
  82   return __pthread_attr_setaffinity_np (attr, 128, cpuset);
  83 }
  84 compat_symbol (libc, __pthread_attr_setaffinity_old,
  85                pthread_attr_setaffinity_np, GLIBC_2_3_3);
  86 #endif