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1 | /* Copyright (C) 2003-2013 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, see | |
17 | <http://www.gnu.org/licenses/>. */ | |
18 | ||
19 | #include <alloca.h> | |
20 | #include <errno.h> | |
21 | #include <pthreadP.h> | |
22 | #include <sysdep.h> | |
23 | #include <sys/types.h> | |
24 | #include <shlib-compat.h> | |
25 | ||
26 | ||
27 | size_t __kernel_cpumask_size attribute_hidden; | |
28 | ||
29 | ||
30 | /* Determine the current affinity. As a side affect we learn | |
31 | about the size of the cpumask_t in the kernel. */ | |
32 | int | |
33 | __determine_cpumask_size (pid_t tid) | |
34 | { | |
35 | INTERNAL_SYSCALL_DECL (err); | |
36 | int res; | |
37 | ||
38 | size_t psize = 128; | |
39 | void *p = alloca (psize); | |
40 | ||
41 | while (res = INTERNAL_SYSCALL (sched_getaffinity, err, 3, tid, psize, p), | |
42 | INTERNAL_SYSCALL_ERROR_P (res, err) | |
43 | && INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL) | |
44 | p = extend_alloca (p, psize, 2 * psize); | |
45 | ||
46 | if (res == 0 || INTERNAL_SYSCALL_ERROR_P (res, err)) | |
47 | return INTERNAL_SYSCALL_ERRNO (res, err); | |
48 | ||
49 | __kernel_cpumask_size = res; | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
54 | ||
55 | int | |
56 | __pthread_setaffinity_new (pthread_t th, size_t cpusetsize, | |
57 | const cpu_set_t *cpuset) | |
58 | { | |
59 | const struct pthread *pd = (const struct pthread *) th; | |
60 | ||
61 | INTERNAL_SYSCALL_DECL (err); | |
62 | int res; | |
63 | ||
64 | if (__builtin_expect (__kernel_cpumask_size == 0, 0)) | |
65 | { | |
66 | res = __determine_cpumask_size (pd->tid); | |
67 | if (res != 0) | |
68 | return res; | |
69 | } | |
70 | ||
71 | /* We now know the size of the kernel cpumask_t. Make sure the user | |
72 | does not request to set a bit beyond that. */ | |
73 | for (size_t cnt = __kernel_cpumask_size; cnt < cpusetsize; ++cnt) | |
74 | if (((char *) cpuset)[cnt] != '\0') | |
75 | /* Found a nonzero byte. This means the user request cannot be | |
76 | fulfilled. */ | |
77 | return EINVAL; | |
78 | ||
79 | res = INTERNAL_SYSCALL (sched_setaffinity, err, 3, pd->tid, cpusetsize, | |
80 | cpuset); | |
81 | ||
82 | #ifdef RESET_VGETCPU_CACHE | |
83 | if (!INTERNAL_SYSCALL_ERROR_P (res, err)) | |
84 | RESET_VGETCPU_CACHE (); | |
85 | #endif | |
86 | ||
87 | return (INTERNAL_SYSCALL_ERROR_P (res, err) | |
88 | ? INTERNAL_SYSCALL_ERRNO (res, err) | |
89 | : 0); | |
90 | } | |
91 | versioned_symbol (libpthread, __pthread_setaffinity_new, | |
92 | pthread_setaffinity_np, GLIBC_2_3_4); | |
93 | ||
94 | ||
95 | #if SHLIB_COMPAT (libpthread, GLIBC_2_3_3, GLIBC_2_3_4) | |
96 | int | |
97 | __pthread_setaffinity_old (pthread_t th, cpu_set_t *cpuset) | |
98 | { | |
99 | /* The old interface by default assumed a 1024 processor bitmap. */ | |
100 | return __pthread_setaffinity_new (th, 128, cpuset); | |
101 | } | |
102 | compat_symbol (libpthread, __pthread_setaffinity_old, pthread_setaffinity_np, | |
103 | GLIBC_2_3_3); | |
104 | #endif |