1 /*
2 * Copyright (c) 2005, Bull S.A.. All rights reserved.
3 * Created by: Sebastien Decugis
4
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of version 2 of the GNU General Public License as
7 * published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope that it would be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
12 *
13 * You should have received a copy of the GNU General Public License along
14 * with this program; if not, write the Free Software Foundation, Inc.,
15 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
16
17 * This stress test aims to test the following assertion:
18 * sem_getvalue always returns the value of the semaphore at a given time
19 * during the call into the sval argument.
20
21 * The steps are:
22 * -> Create a named semaphore and an unnamed semaphore, initialized to 0.
23 * -> create two threads which continuously post and wait these semaphores.
24 * -> main loops on sem_getvalue on these two semaphores.
25
26 * The test fails if sem_getvalue gets a value different from 0 or 1.
27
28 */
29
30 #include <pthread.h>
31 #include <stdarg.h>
32 #include <stdio.h>
33 #include <stdlib.h>
34 #include <string.h>
35 #include <unistd.h>
36
37 #include <semaphore.h>
38 #include <fcntl.h>
39 #include <errno.h>
40 #include <signal.h>
41
42 #include "testfrmw.h"
43 #include "testfrmw.c"
44 /* This header is responsible for defining the following macros:
45 * UNRESOLVED(ret, descr);
46 * where descr is a description of the error and ret is an int (error code for example)
47 * FAILED(descr);
48 * where descr is a short text saying why the test has failed.
49 * PASSED();
50 * No parameter.
51 *
52 * Both three macros shall terminate the calling process.
53 * The testcase shall not terminate in any other maneer.
54 *
55 * The other file defines the functions
56 * void output_init()
57 * void output(char * string, ...)
58 *
59 * Those may be used to output information.
60 */
61
62 #ifndef VERBOSE
63 #define VERBOSE 1
64 #endif
65
66 #define SEM_NAME "/set_getval_stress"
67
68 #define INIT_VAL 0
69
70 char do_it = 1;
71 long long iterations = 0;
72
73 /* Handler for user request to terminate */
sighdl(int sig)74 void sighdl(int sig)
75 {
76 /* do_it = 0 */
77
78 do {
79 do_it = 0;
80 } while (do_it);
81 }
82
83 /* Thread function */
threaded(void * arg)84 void *threaded(void *arg)
85 {
86 int ret = 0;
87
88 do {
89 /* sem_post */
90 ret = sem_post(arg);
91
92 if (ret != 0) {
93 UNRESOLVED(errno, "Failed to post the semaphore");
94 }
95
96 /* sem wait */
97 do {
98 ret = sem_wait(arg);
99 } while ((ret != 0) && (errno == EINTR));
100
101 if (ret != 0) {
102 UNRESOLVED(errno, "Failed to wait for the semaphore");
103 }
104
105 } while (do_it);
106
107 return NULL;
108 }
109
110 /* Main function */
main(int argc,char * argv[])111 int main(int argc, char *argv[])
112 {
113 int ret = 0, value;
114
115 struct sigaction sa;
116
117 pthread_t child1, child2;
118
119 sem_t unnamed, *named;
120
121 /* Initialize output routine */
122 output_init();
123
124 /* Register the signal handler for SIGUSR1 */
125 sigemptyset(&sa.sa_mask);
126
127 sa.sa_flags = 0;
128
129 sa.sa_handler = sighdl;
130
131 if ((ret = sigaction(SIGUSR1, &sa, NULL))) {
132 UNRESOLVED(ret, "Unable to register signal handler");
133 }
134
135 if ((ret = sigaction(SIGALRM, &sa, NULL))) {
136 UNRESOLVED(ret, "Unable to register signal handler");
137 }
138 #if VERBOSE > 1
139 output("[parent] Signal handler registered\n");
140
141 #endif
142
143 /* Initialize the semaphores */
144 named = sem_open(SEM_NAME, O_CREAT, 0777, INIT_VAL);
145
146 if (named == SEM_FAILED) {
147 UNRESOLVED(errno, "Failed to sem_open");
148 }
149
150 ret = sem_unlink(SEM_NAME);
151
152 if (ret != 0) {
153 UNRESOLVED(errno, "Failed to sem_unlink");
154 }
155
156 ret = sem_init(&unnamed, 0, INIT_VAL);
157
158 if (ret != 0) {
159 UNRESOLVED(errno, "Failed to sem_init");
160 }
161
162 /* Create the threads */
163 ret = pthread_create(&child1, NULL, threaded, named);
164
165 if (ret != 0) {
166 UNRESOLVED(ret, "Failed to create a thread");
167 }
168
169 ret = pthread_create(&child2, NULL, threaded, &unnamed);
170
171 if (ret != 0) {
172 UNRESOLVED(ret, "Failed to create a thread");
173 }
174
175 /* loop */
176 while (do_it) {
177 ret = sem_getvalue(named, &value);
178
179 if (ret != 0) {
180 UNRESOLVED(errno, "Failed to get sem value");
181 }
182
183 if ((value != INIT_VAL) && (value != INIT_VAL + 1)) {
184 output("Got value %d, expected %d or %d only\n",
185 value, INIT_VAL, INIT_VAL + 1);
186 FAILED
187 ("sem_getvalue returned an invalid value for the named semaphore");
188 }
189
190 ret = sem_getvalue(&unnamed, &value);
191
192 if (ret != 0) {
193 UNRESOLVED(errno, "Failed to get sem value");
194 }
195
196 if ((value != INIT_VAL) && (value != INIT_VAL + 1)) {
197 output("Got value %d, expected %d or %d only\n",
198 value, INIT_VAL, INIT_VAL + 1);
199 FAILED
200 ("sem_getvalue returned an invalid value for the unnamed semaphore");
201 }
202
203 iterations++;
204 }
205
206 /* Join the threads */
207 ret = pthread_join(child1, NULL);
208
209 if (ret != 0) {
210 UNRESOLVED(ret, "Failed to join a thread");
211 }
212
213 ret = pthread_join(child2, NULL);
214
215 if (ret != 0) {
216 UNRESOLVED(ret, "Failed to join a thread");
217 }
218
219 /* Destroy the semaphores */
220 ret = sem_close(named);
221
222 if (ret != 0) {
223 UNRESOLVED(errno, "Failed to close the semaphore");
224 }
225
226 ret = sem_destroy(&unnamed);
227
228 if (ret != 0) {
229 UNRESOLVED(errno, "Failed to destroy the semaphore");
230 }
231
232 /* Passed */
233 output("pthread_exit stress test PASSED -- %llu iterations\n",
234 iterations);
235
236 PASSED;
237 }
238