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
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
|
/* Copyright (C) 2014-2016 Free Software Foundation, Inc.
This file is part of the GNU C Library.
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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
#include <pthread.h>
#include <sys/prctl.h>
#if __mips_fpr != 0 || _MIPS_SPFPSET != 16
# error This test requires -mfpxx -mno-odd-spreg
#endif
/* This test verifies that all threads in a process see a mode
change when any thread causes a mode change. */
static int mode[6] =
{
0,
PR_FP_MODE_FR,
PR_FP_MODE_FR | PR_FP_MODE_FRE,
PR_FP_MODE_FR,
0,
PR_FP_MODE_FR | PR_FP_MODE_FRE
};
static volatile int current_mode;
static volatile int finished;
static pthread_barrier_t barr_ready;
static pthread_barrier_t barr_cont;
static void *
thread_function (void * arg __attribute__ ((unused)))
{
while (!finished)
{
int res = pthread_barrier_wait (&barr_ready);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
int mode = prctl (PR_GET_FP_MODE);
if (mode != current_mode)
{
printf ("unexpected mode: %d != %d\n", mode, current_mode);
exit (1);
}
res = pthread_barrier_wait (&barr_cont);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
}
return NULL;
}
int
main (void)
{
int count = sysconf (_SC_NPROCESSORS_ONLN);
if (count <= 0)
count = 1;
count *= 4;
pthread_t th[count];
int i;
int result = 0;
if (pthread_barrier_init (&barr_ready, NULL, count + 1) != 0)
{
printf ("failed to initialize barrier: %m\n");
exit (1);
}
if (pthread_barrier_init (&barr_cont, NULL, count + 1) != 0)
{
printf ("failed to initialize barrier: %m\n");
exit (1);
}
for (i = 0; i < count; ++i)
if (pthread_create (&th[i], NULL, thread_function, 0) != 0)
{
printf ("creation of thread %d failed\n", i);
exit (1);
}
for (i = 0 ; i < 7 ; i++)
{
if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0)
{
if (errno != ENOTSUP)
{
printf ("prctl PR_SET_FP_MODE failed: %m");
exit (1);
}
}
else
current_mode = mode[i % 6];
int res = pthread_barrier_wait (&barr_ready);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
if (i == 6)
finished = 1;
res = pthread_barrier_wait (&barr_cont);
if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
{
printf ("barrier wait failed: %m\n");
exit (1);
}
}
for (i = 0; i < count; ++i)
{
void *v;
if (pthread_join (th[i], &v) != 0)
{
printf ("join of thread %d failed\n", i);
result = 1;
}
else if (v != NULL)
{
printf ("join %d successful, but child failed\n", i);
result = 1;
}
else
printf ("join %d successful\n", i);
}
return result;
}
|
