1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
|
/* Copyright (C) 2003, 2004 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;
/* 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);
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
|
