diff options
Diffstat (limited to 'nptl/pthread_attr_getaffinity.c')
| -rw-r--r-- | nptl/pthread_attr_getaffinity.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/nptl/pthread_attr_getaffinity.c b/nptl/pthread_attr_getaffinity.c new file mode 100644 index 0000000000..c80fef47c4 --- /dev/null +++ b/nptl/pthread_attr_getaffinity.c @@ -0,0 +1,74 @@ +/* Copyright (C) 2003-2014 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 <pthreadP.h> +#include <string.h> +#include <sysdep.h> +#include <sys/types.h> +#include <sys/param.h> +#include <shlib-compat.h> + + +int +__pthread_attr_getaffinity_new (const pthread_attr_t *attr, size_t cpusetsize, + cpu_set_t *cpuset) +{ + const struct pthread_attr *iattr; + + assert (sizeof (*attr) >= sizeof (struct pthread_attr)); + iattr = (const struct pthread_attr *) attr; + + if (iattr->cpuset != NULL) + { + /* Check whether there are any bits set beyond the limits + the user requested. */ + for (size_t cnt = cpusetsize; cnt < iattr->cpusetsize; ++cnt) + if (((char *) iattr->cpuset)[cnt] != 0) + return EINVAL; + + /* Copy over the cpuset from the thread attribute object. Limit the copy + to the minimum of the source and destination sizes to prevent a buffer + overrun. If the destination is larger, fill the remaining space with + zeroes. */ + void *p = mempcpy (cpuset, iattr->cpuset, + MIN (iattr->cpusetsize, cpusetsize)); + if (cpusetsize > iattr->cpusetsize) + memset (p, '\0', cpusetsize - iattr->cpusetsize); + } + else + /* We have no information. */ + memset (cpuset, -1, cpusetsize); + + return 0; +} +versioned_symbol (libpthread, __pthread_attr_getaffinity_new, + pthread_attr_getaffinity_np, GLIBC_2_3_4); + + +#if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4) +int +__pthread_attr_getaffinity_old (const pthread_attr_t *attr, cpu_set_t *cpuset) +{ + /* The old interface by default assumed a 1024 processor bitmap. */ + return __pthread_attr_getaffinity_new (attr, 128, cpuset); +} +compat_symbol (libpthread, __pthread_attr_getaffinity_old, + pthread_attr_getaffinity_np, GLIBC_2_3_3); +#endif |