| /* Copyright (C) 2003, 2004, 2006, 2007 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <alloca.h> |
| #include <errno.h> |
| #include <pthreadP.h> |
| #include <sysdep.h> |
| #include <sys/types.h> |
| #include <shlib-compat.h> |
| |
| |
| size_t __kernel_cpumask_size attribute_hidden; |
| |
| |
| /* Determine the current affinity. As a side affect we learn |
| about the size of the cpumask_t in the kernel. */ |
| int |
| __determine_cpumask_size (pid_t tid) |
| { |
| INTERNAL_SYSCALL_DECL (err); |
| int res; |
| |
| size_t psize = 128; |
| void *p = alloca (psize); |
| |
| while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, tid, psize, p), |
| INTERNAL_SYSCALL_ERROR_P (res, err) |
| && INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL) |
| p = extend_alloca (p, psize, 2 * psize); |
| |
| if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err)) |
| return INTERNAL_SYSCALL_ERRNO (res, err); |
| |
| __kernel_cpumask_size = res; |
| |
| return 0; |
| } |
| |
| |
| int |
| __pthread_setaffinity_new (pthread_t th, size_t cpusetsize, |
| const cpu_set_t *cpuset) |
| { |
| const struct pthread *pd = (const struct pthread *) th; |
| |
| INTERNAL_SYSCALL_DECL (err); |
| int res; |
| |
| if (__builtin_expect (__kernel_cpumask_size == 0, 0)) |
| { |
| res = __determine_cpumask_size (pd->tid); |
| if (res != 0) |
| return res; |
| } |
| |
| /* We now know the size of the kernel cpumask_t. Make sure the user |
| does not request to set a bit beyond that. */ |
| for (size_t cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt) |
| if (((char *) cpuset)[cnt] != '\0') |
| /* Found a nonzero byte. This means the user request cannot be |
| fulfilled. */ |
| return EINVAL; |
| |
| res = INTERNAL_SYSCALL (sched_setaffinity, err, 3, pd->tid, cpusetsize, |
| cpuset); |
| |
| #ifdef RESET_VGETCPU_CACHE |
| if (!INTERNAL_SYSCALL_ERROR_P (res, err)) |
| RESET_VGETCPU_CACHE (); |
| #endif |
| |
| return (INTERNAL_SYSCALL_ERROR_P (res, err) |
| ? INTERNAL_SYSCALL_ERRNO (res, err) |
| : 0); |
| } |
| versioned_symbol (libpthread, __pthread_setaffinity_new, |
| pthread_setaffinity_np, GLIBC_2_3_4); |
| |
| |
| #if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4) |
| int |
| __pthread_setaffinity_old (pthread_t th, cpu_set_t *cpuset) |
| { |
| /* The old interface by default assumed a 1024 processor bitmap. */ |
| return __pthread_setaffinity_new (th, 128, cpuset); |
| } |
| compat_symbol (libpthread, __pthread_setaffinity_old, pthread_setaffinity_np, |
| GLIBC_2_3_3); |
| #endif |