1 /* Copyright (C) 2003-2023 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 <time.h>
23 #include <unistd.h>
24
25
26 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
27 static pthread_barrier_t b2;
28 static pthread_barrier_t bN;
29
30
31 static void *
32 tf (void *arg)
33 {
34 int e = pthread_barrier_wait (&b2);
35 if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
36 {
37 puts ("barrier_wait failed");
38 exit (1);
39 }
40
41 e = pthread_barrier_wait (&bN);
42 if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
43 {
44 puts ("barrier_wait failed");
45 exit (1);
46 }
47
48 return NULL;
49 }
50 #endif
51
52
53 int
54 do_test (void)
55 {
56 #if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
57 # define N 10
58
59 # if _POSIX_THREAD_CPUTIME == 0
60 if (sysconf (_SC_THREAD_CPUTIME) < 0)
61 {
62 puts ("_POSIX_THREAD_CPUTIME option not available");
63 return 0;
64 }
65 # endif
66
67 if (pthread_barrier_init (&b2, NULL, 2) != 0
68 || pthread_barrier_init (&bN, NULL, N + 1) != 0)
69 {
70 puts ("barrier_init failed");
71 return 1;
72 }
73
74 struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
75 TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
76
77 pthread_t th[N + 1];
78 clockid_t cl[N + 1];
79 # ifndef CLOCK_THREAD_CPUTIME_ID
80 if (pthread_getcpuclockid (pthread_self (), &cl[0]) != 0)
81 {
82 puts ("own pthread_getcpuclockid failed");
83 return 1;
84 }
85 # else
86 cl[0] = CLOCK_THREAD_CPUTIME_ID;
87 # endif
88
89 pthread_attr_t at;
90
91 if (pthread_attr_init (&at) != 0)
92 {
93 puts ("attr_init failed");
94 return 1;
95 }
96
97 if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
98 {
99 puts ("attr_setstacksize failed");
100 return 1;
101 }
102
103 int i;
104 int e;
105 for (i = 0; i < N; ++i)
106 {
107 if (pthread_create (&th[i], &at, tf, NULL) != 0)
108 {
109 puts ("create failed");
110 return 1;
111 }
112
113 e = pthread_barrier_wait (&b2);
114 if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
115 {
116 puts ("barrier_wait failed");
117 return 1;
118 }
119
120 ts.tv_sec = 0;
121 ts.tv_nsec = 100000000;
122 TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
123
124 if (pthread_getcpuclockid (th[i], &cl[i + 1]) != 0)
125 {
126 puts ("pthread_getcpuclockid failed");
127 return 1;
128 }
129 }
130
131 if (pthread_attr_destroy (&at) != 0)
132 {
133 puts ("attr_destroy failed");
134 return 1;
135 }
136
137 struct timespec t[N + 1];
138 for (i = 0; i < N + 1; ++i)
139 if (clock_gettime (cl[i], &t[i]) != 0)
140 {
141 printf ("clock_gettime round %d failed\n", i);
142 return 1;
143 }
144
145 for (i = 0; i < N; ++i)
146 {
147 struct timespec diff;
148
149 diff.tv_sec = t[i].tv_sec - t[i + 1].tv_sec;
150 diff.tv_nsec = t[i].tv_nsec - t[i + 1].tv_nsec;
151 if (diff.tv_nsec < 0)
152 {
153 diff.tv_nsec += 1000000000;
154 --diff.tv_sec;
155 }
156
157 if (diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_nsec < 100000000))
158 {
159 printf ("\
160 difference between thread %d and %d too small (%ld.%09ld)\n",
161 i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
162 return 1;
163 }
164
165 printf ("diff %d->%d: %ld.%09ld\n",
166 i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
167 }
168
169 ts.tv_sec = 0;
170 ts.tv_nsec = 0;
171 for (i = 0; i < N + 1; ++i)
172 if (clock_settime (cl[i], &ts) != 0)
173 {
174 printf ("clock_settime(%d) round %d failed\n", cl[i], i);
175 return 1;
176 }
177
178 for (i = 0; i < N + 1; ++i)
179 {
180 if (clock_gettime (cl[i], &ts) != 0)
181 {
182 puts ("clock_gettime failed");
183 return 1;
184 }
185
186 if (ts.tv_sec > t[i].tv_sec
187 || (ts.tv_sec == t[i].tv_sec && ts.tv_nsec > t[i].tv_nsec))
188 {
189 puts ("clock_settime didn't reset clock");
190 return 1;
191 }
192 }
193 #endif
194
195 return 0;
196 }
197
198
199 #define TEST_FUNCTION do_test ()
200 #include "../test-skeleton.c"