1 /* Copyright (C) 2014-2021 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3
4 The GNU C Library is free software; you can redistribute it and/or
5 modify it under the terms of the GNU Lesser General Public
6 License as published by the Free Software Foundation; either
7 version 2.1 of the License, or (at your option) any later version.
8
9 The GNU C Library is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 Lesser General Public License for more details.
13
14 You should have received a copy of the GNU Lesser General Public
15 License along with the GNU C Library; if not, see
16 <https://www.gnu.org/licenses/>. */
17
18 #include <errno.h>
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <unistd.h>
23 #include <limits.h>
24 #include <pthread.h>
25 #include <sys/prctl.h>
26
27 #if __mips_fpr != 0 || _MIPS_SPFPSET != 16
28 # error This test requires -mfpxx -mno-odd-spreg
29 #endif
30
31 /* This test verifies that all threads in a process see a mode
32 change when any thread causes a mode change. */
33
34 static int mode[6] =
35 {
36 0,
37 PR_FP_MODE_FR,
38 PR_FP_MODE_FR | PR_FP_MODE_FRE,
39 PR_FP_MODE_FR,
40 0,
41 PR_FP_MODE_FR | PR_FP_MODE_FRE
42 };
43 static volatile int current_mode;
44 static volatile int finished;
45 static pthread_barrier_t barr_ready;
46 static pthread_barrier_t barr_cont;
47
48 static void *
thread_function(void * arg)49 thread_function (void * arg __attribute__ ((unused)))
50 {
51 while (!finished)
52 {
53 int res = pthread_barrier_wait (&barr_ready);
54
55 if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
56 {
57 printf ("barrier wait failed: %m\n");
58 exit (1);
59 }
60
61 int mode = prctl (PR_GET_FP_MODE);
62
63 if (mode != current_mode)
64 {
65 printf ("unexpected mode: %d != %d\n", mode, current_mode);
66 exit (1);
67 }
68
69 res = pthread_barrier_wait (&barr_cont);
70
71 if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
72 {
73 printf ("barrier wait failed: %m\n");
74 exit (1);
75 }
76 }
77 return NULL;
78 }
79
80 static int
do_test(void)81 do_test (void)
82 {
83 int count = sysconf (_SC_NPROCESSORS_ONLN);
84 if (count <= 0)
85 count = 1;
86 count *= 4;
87
88 pthread_t th[count];
89 int i;
90 int result = 0;
91
92 if (pthread_barrier_init (&barr_ready, NULL, count + 1) != 0)
93 {
94 printf ("failed to initialize barrier: %m\n");
95 exit (1);
96 }
97
98 if (pthread_barrier_init (&barr_cont, NULL, count + 1) != 0)
99 {
100 printf ("failed to initialize barrier: %m\n");
101 exit (1);
102 }
103
104 for (i = 0; i < count; ++i)
105 if (pthread_create (&th[i], NULL, thread_function, 0) != 0)
106 {
107 printf ("creation of thread %d failed\n", i);
108 exit (1);
109 }
110
111 for (i = 0 ; i < 7 ; i++)
112 {
113 if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0)
114 {
115 if (errno != ENOTSUP)
116 {
117 printf ("prctl PR_SET_FP_MODE failed: %m");
118 exit (1);
119 }
120 }
121 else
122 current_mode = mode[i % 6];
123
124
125 int res = pthread_barrier_wait (&barr_ready);
126
127 if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
128 {
129 printf ("barrier wait failed: %m\n");
130 exit (1);
131 }
132
133 if (i == 6)
134 finished = 1;
135
136 res = pthread_barrier_wait (&barr_cont);
137
138 if (res != 0 && res != PTHREAD_BARRIER_SERIAL_THREAD)
139 {
140 printf ("barrier wait failed: %m\n");
141 exit (1);
142 }
143 }
144
145 for (i = 0; i < count; ++i)
146 {
147 void *v;
148 if (pthread_join (th[i], &v) != 0)
149 {
150 printf ("join of thread %d failed\n", i);
151 result = 1;
152 }
153 else if (v != NULL)
154 {
155 printf ("join %d successful, but child failed\n", i);
156 result = 1;
157 }
158 else
159 printf ("join %d successful\n", i);
160 }
161
162 return result;
163 }
164
165 #define TEST_FUNCTION do_test ()
166 #include "../../test-skeleton.c"
167