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glibc  2.9
pthread_getaffinity.c
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00001 /* Copyright (C) 2003, 2004 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003    Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <limits.h>
00022 #include <pthreadP.h>
00023 #include <string.h>
00024 #include <sysdep.h>
00025 #include <sys/param.h>
00026 #include <sys/types.h>
00027 #include <shlib-compat.h>
00028 
00029 
00030 int
00031 __pthread_getaffinity_new (pthread_t th, size_t cpusetsize, cpu_set_t *cpuset)
00032 {
00033   const struct pthread *pd = (const struct pthread *) th;
00034 
00035   INTERNAL_SYSCALL_DECL (err);
00036   int res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, pd->tid,
00037                            MIN (INT_MAX, cpusetsize), cpuset);
00038   if (INTERNAL_SYSCALL_ERROR_P (res, err))
00039     return INTERNAL_SYSCALL_ERRNO (res, err);
00040 
00041   /* Clean the rest of the memory the kernel didn't do.  */
00042   memset ((char *) cpuset + res, '\0', cpusetsize - res);
00043 
00044   return 0;
00045 }
00046 strong_alias (__pthread_getaffinity_new, __pthread_getaffinity_np)
00047 versioned_symbol (libpthread, __pthread_getaffinity_new,
00048                 pthread_getaffinity_np, GLIBC_2_3_4);
00049 
00050 
00051 #if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4)
00052 int
00053 __pthread_getaffinity_old (pthread_t th, cpu_set_t *cpuset)
00054 {
00055   /* The old interface by default assumed a 1024 processor bitmap.  */
00056   return __pthread_getaffinity_new (th, 128, cpuset);
00057 }
00058 compat_symbol (libpthread, __pthread_getaffinity_old, pthread_getaffinity_np,
00059               GLIBC_2_3_3);
00060 #endif