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/* Copyright (C) 2003, 2004, 2006 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, see <http://www.gnu.org/licenses/>. */ #include <assert.h> #include <errno.h> #include <limits.h> #include <stdlib.h> #include <string.h> #include <pthreadP.h> /* Defined in pthread_setaffinity.c. */ extern size_t __kernel_cpumask_size attribute_hidden; extern int __determine_cpumask_size (pid_t tid); libpthread_hidden_proto(__determine_cpumask_size) int pthread_attr_setaffinity_np (pthread_attr_t *attr, size_t cpusetsize, const cpu_set_t *cpuset) { struct pthread_attr *iattr; assert (sizeof (*attr) >= sizeof (struct pthread_attr)); iattr = (struct pthread_attr *) attr; if (cpuset == NULL || cpusetsize == 0) { free (iattr->cpuset); iattr->cpuset = NULL; iattr->cpusetsize = 0; } else { if (__kernel_cpumask_size == 0) { int res = __determine_cpumask_size (THREAD_SELF->tid); if (res != 0) /* Some serious problem. */ return res; } /* Check whether the new bitmask has any bit set beyond the last one the kernel accepts. */ size_t cnt; for (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; if (iattr->cpusetsize != cpusetsize) { void *newp = (cpu_set_t *) realloc (iattr->cpuset, cpusetsize); if (newp == NULL) return ENOMEM; iattr->cpuset = newp; iattr->cpusetsize = cpusetsize; } memcpy (iattr->cpuset, cpuset, cpusetsize); } return 0; } |