nptl/pthread_attr_setaffinity.c

   1 /* Copyright (C) 2003-2023 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <https://www.gnu.org/licenses/>.  */
  17
  18 #include <errno.h>
  19 #include <limits.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <pthreadP.h>
  23 #include <shlib-compat.h>
  24
  25
  26 int
  27 __pthread_attr_setaffinity_np (pthread_attr_t *attr, size_t cpusetsize,
  28                                const cpu_set_t *cpuset)
  29 {
  30   struct pthread_attr *iattr;
  31
  32   iattr = (struct pthread_attr *) attr;
  33
  34   if (cpuset == NULL || cpusetsize == 0)
  35     {
  36       if (iattr->extension != NULL)
  37         {
  38           free (iattr->extension->cpuset);
  39           iattr->extension->cpuset = NULL;
  40           iattr->extension->cpusetsize = 0;
  41         }
  42     }
  43   else
  44     {
  45       int ret = __pthread_attr_extension (iattr);
  46       if (ret != 0)
  47         return ret;
  48
  49       if (iattr->extension->cpusetsize != cpusetsize)
  50         {
  51           void *newp = realloc (iattr->extension->cpuset, cpusetsize);
  52           if (newp == NULL)
  53             return ENOMEM;
  54
  55           iattr->extension->cpuset = newp;
  56           iattr->extension->cpusetsize = cpusetsize;
  57         }
  58
  59       memcpy (iattr->extension->cpuset, cpuset, cpusetsize);
  60     }
  61
  62   return 0;
  63 }
  64 libc_hidden_def (__pthread_attr_setaffinity_np)
  65 versioned_symbol (libc, __pthread_attr_setaffinity_np,
  66                   pthread_attr_setaffinity_np, GLIBC_2_32);
  67
  68
  69 #if SHLIB_COMPAT (libc, GLIBC_2_3_4, GLIBC_2_32)
  70 /* Compat symbol with the old libc version.  */
  71 strong_alias (__pthread_attr_setaffinity_np, __pthread_attr_setaffinity_alias)
  72 compat_symbol (libc, __pthread_attr_setaffinity_alias,
  73                pthread_attr_setaffinity_np, GLIBC_2_3_4);
  74 #endif
  75
  76 #if SHLIB_COMPAT (libc, GLIBC_2_3_3, GLIBC_2_3_4)
  77 int
  78 __pthread_attr_setaffinity_old (pthread_attr_t *attr, cpu_set_t *cpuset)
  79 {
  80   /* The old interface by default assumed a 1024 processor bitmap.  */
  81   return __pthread_attr_setaffinity_np (attr, 128, cpuset);
  82 }
  83 compat_symbol (libc, __pthread_attr_setaffinity_old,
  84                pthread_attr_setaffinity_np, GLIBC_2_3_3);
  85 #endif