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

   1 /* Copyright (C) 2003, 2004 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, write to the Free
  17    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <limits.h>
  22 #include <pthreadP.h>
  23 #include <string.h>
  24 #include <sysdep.h>
  25 #include <sys/param.h>
  26 #include <sys/types.h>
  27 #include <shlib-compat.h>
  28
  29
  30 int
  31 __pthread_getaffinity_new (pthread_t th, size_t cpusetsize, cpu_set_t *cpuset)
  32 {
  33   const struct pthread *pd = (const struct pthread *) th;
  34
  35   INTERNAL_SYSCALL_DECL (err);
  36   int res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, pd->tid,
  37                               MIN (INT_MAX, cpusetsize), cpuset);
  38   if (INTERNAL_SYSCALL_ERROR_P (res, err))
  39     return INTERNAL_SYSCALL_ERRNO (res, err);
  40
  41   /* Clean the rest of the memory the kernel didn't do.  */
  42   memset ((char *) cpuset + res, '\0', cpusetsize - res);
  43
  44   return 0;
  45 }
  46 strong_alias (__pthread_getaffinity_new, __pthread_getaffinity_np)
  47 versioned_symbol (libpthread, __pthread_getaffinity_new,
  48                   pthread_getaffinity_np, GLIBC_2_3_4);
  49
  50
  51 #if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
  52 int
  53 __pthread_getaffinity_old (pthread_t th, cpu_set_t *cpuset)
  54 {
  55   /* The old interface by default assumed a 1024 processor bitmap.  */
  56   return __pthread_getaffinity_new (th, 128, cpuset);
  57 }
  58 compat_symbol (libpthread, __pthread_getaffinity_old, pthread_getaffinity_np,
  59                GLIBC_2_3_3);
  60 #endif