1/* Copyright (C) 2014-2022 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 <pthread.h>
20#include <stdio.h>
21#include <stdlib.h>
22#include <string.h>
23#include <unistd.h>
24#include <limits.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 mode changes do not clobber register state
32 in other threads. */
33
34static volatile int finished;
35static int mode[6] =
36 {
37 0,
38 PR_FP_MODE_FR,
39 PR_FP_MODE_FR | PR_FP_MODE_FRE,
40 PR_FP_MODE_FR,
41 0,
42 PR_FP_MODE_FR | PR_FP_MODE_FRE
43 };
44
45static void *
46thread_function (void * arg __attribute__ ((unused)))
47{
48 volatile int i = 0;
49 volatile float f = 0.0;
50 volatile double d = 0.0;
51
52 while (!finished)
53 {
54 if ((float) i != f || (double) i != d)
55 {
56 printf (format: "unexpected value: i(%d) f(%f) d(%f)\n", i, f, d);
57 exit (1);
58 }
59
60 if (i == 100)
61 {
62 i = 0;
63 f = 0.0;
64 d = 0.0;
65 }
66
67 i++;
68 f++;
69 d++;
70 }
71 return NULL;
72}
73
74static int
75do_test (void)
76{
77 int count = sysconf (_SC_NPROCESSORS_ONLN);
78 if (count <= 0)
79 count = 1;
80 count *= 4;
81
82 pthread_t th[count];
83 int i;
84 int result = 0;
85
86 for (i = 0; i < count; ++i)
87 if (pthread_create (newthread: &th[i], NULL, start_routine: thread_function, arg: 0) != 0)
88 {
89 printf (format: "creation of thread %d failed\n", i);
90 exit (1);
91 }
92
93 for (i = 0 ; i < 1000000 ; i++)
94 {
95 if (prctl (PR_SET_FP_MODE, mode[i % 6]) != 0
96 && errno != ENOTSUP)
97 {
98 printf (format: "prctl PR_SET_FP_MODE failed: %m\n");
99 exit (1);
100 }
101 }
102
103 finished = 1;
104
105 for (i = 0; i < count; ++i)
106 {
107 void *v;
108 if (pthread_join (th: th[i], thread_return: &v) != 0)
109 {
110 printf (format: "join of thread %d failed\n", i);
111 result = 1;
112 }
113 else if (v != NULL)
114 {
115 printf (format: "join %d successful, but child failed\n", i);
116 result = 1;
117 }
118 else
119 printf (format: "join %d successful\n", i);
120 }
121
122 return result;
123}
124
125#define TEST_FUNCTION do_test ()
126#include "../../test-skeleton.c"
127

source code of glibc/sysdeps/mips/tst-mode-switch-1.c