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1 office 1 /* Unit tests for GMutex
2 * Copyright (C) 2011 Red Hat, Inc
3 * Author: Matthias Clasen
4 *
5 * This work is provided "as is"; redistribution and modification
6 * in whole or in part, in any medium, physical or electronic is
7 * permitted without restriction.
8 *
9 * This work 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.
12 *
13 * In no event shall the authors or contributors be liable for any
14 * direct, indirect, incidental, special, exemplary, or consequential
15 * damages (including, but not limited to, procurement of substitute
16 * goods or services; loss of use, data, or profits; or business
17 * interruption) however caused and on any theory of liability, whether
18 * in contract, strict liability, or tort (including negligence or
19 * otherwise) arising in any way out of the use of this software, even
20 * if advised of the possibility of such damage.
21 */
22  
23 /* We are testing some deprecated APIs here */
24 #define GLIB_DISABLE_DEPRECATION_WARNINGS
25  
26 #include <glib.h>
27  
28 #include <stdio.h>
29  
30 static void
31 test_mutex1 (void)
32 {
33 GMutex mutex;
34  
35 g_mutex_init (&mutex);
36 g_mutex_lock (&mutex);
37 g_mutex_unlock (&mutex);
38 g_mutex_lock (&mutex);
39 g_mutex_unlock (&mutex);
40 g_mutex_clear (&mutex);
41 }
42  
43 static void
44 test_mutex2 (void)
45 {
46 static GMutex mutex;
47  
48 g_mutex_lock (&mutex);
49 g_mutex_unlock (&mutex);
50 g_mutex_lock (&mutex);
51 g_mutex_unlock (&mutex);
52 }
53  
54 static void
55 test_mutex3 (void)
56 {
57 GMutex *mutex;
58  
59 mutex = g_mutex_new ();
60 g_mutex_lock (mutex);
61 g_mutex_unlock (mutex);
62 g_mutex_lock (mutex);
63 g_mutex_unlock (mutex);
64 g_mutex_free (mutex);
65 }
66  
67 static void
68 test_mutex4 (void)
69 {
70 static GMutex mutex;
71 gboolean ret;
72  
73 ret = g_mutex_trylock (&mutex);
74 g_assert (ret);
75  
76 /* no guarantees that mutex is recursive, so could return 0 or 1 */
77 if (g_mutex_trylock (&mutex))
78 g_mutex_unlock (&mutex);
79  
80 g_mutex_unlock (&mutex);
81 }
82  
83 #define LOCKS 48
84 #define ITERATIONS 10000
85 #define THREADS 100
86  
87  
88 GThread *owners[LOCKS];
89 GMutex locks[LOCKS];
90  
91 static void
92 acquire (gint nr)
93 {
94 GThread *self;
95  
96 self = g_thread_self ();
97  
98 if (!g_mutex_trylock (&locks[nr]))
99 {
100 if (g_test_verbose ())
101 g_printerr ("thread %p going to block on lock %d\n", self, nr);
102  
103 g_mutex_lock (&locks[nr]);
104 }
105  
106 g_assert (owners[nr] == NULL); /* hopefully nobody else is here */
107 owners[nr] = self;
108  
109 /* let some other threads try to ruin our day */
110 g_thread_yield ();
111 g_thread_yield ();
112 g_thread_yield ();
113  
114 g_assert (owners[nr] == self); /* hopefully this is still us... */
115 owners[nr] = NULL; /* make way for the next guy */
116  
117 g_mutex_unlock (&locks[nr]);
118 }
119  
120 static gpointer
121 thread_func (gpointer data)
122 {
123 gint i;
124 GRand *rand;
125  
126 rand = g_rand_new ();
127  
128 for (i = 0; i < ITERATIONS; i++)
129 acquire (g_rand_int_range (rand, 0, LOCKS));
130  
131 g_rand_free (rand);
132  
133 return NULL;
134 }
135  
136 static void
137 test_mutex5 (void)
138 {
139 gint i;
140 GThread *threads[THREADS];
141  
142 for (i = 0; i < LOCKS; i++)
143 g_mutex_init (&locks[i]);
144  
145 for (i = 0; i < THREADS; i++)
146 threads[i] = g_thread_create (thread_func, NULL, TRUE, NULL);
147  
148 for (i = 0; i < THREADS; i++)
149 g_thread_join (threads[i]);
150  
151 for (i = 0; i < LOCKS; i++)
152 g_mutex_clear (&locks[i]);
153  
154 for (i = 0; i < LOCKS; i++)
155 g_assert (owners[i] == NULL);
156 }
157  
158 #define COUNT_TO 100000000
159  
160 static gboolean
161 do_addition (gint *value)
162 {
163 static GMutex lock;
164 gboolean more;
165  
166 /* test performance of "good" cases (ie: short critical sections) */
167 g_mutex_lock (&lock);
168 if ((more = *value != COUNT_TO))
169 if (*value != -1)
170 (*value)++;
171 g_mutex_unlock (&lock);
172  
173 return more;
174 }
175  
176 static gpointer
177 addition_thread (gpointer value)
178 {
179 while (do_addition (value));
180  
181 return NULL;
182 }
183  
184 static void
185 test_mutex_perf (gconstpointer data)
186 {
187 gint n_threads = GPOINTER_TO_INT (data);
188 GThread *threads[THREADS];
189 gint64 start_time;
190 gdouble rate;
191 gint x = -1;
192 gint i;
193  
194 for (i = 0; i < n_threads - 1; i++)
195 threads[i] = g_thread_create (addition_thread, &x, TRUE, NULL);
196  
197 /* avoid measuring thread setup/teardown time */
198 start_time = g_get_monotonic_time ();
199 g_atomic_int_set (&x, 0);
200 addition_thread (&x);
201 g_assert_cmpint (g_atomic_int_get (&x), ==, COUNT_TO);
202 rate = g_get_monotonic_time () - start_time;
203 rate = x / rate;
204  
205 for (i = 0; i < n_threads - 1; i++)
206 g_thread_join (threads[i]);
207  
208 g_test_maximized_result (rate, "%f mips", rate);
209 }
210  
211 int
212 main (int argc, char *argv[])
213 {
214 g_test_init (&argc, &argv, NULL);
215  
216 g_test_add_func ("/thread/mutex1", test_mutex1);
217 g_test_add_func ("/thread/mutex2", test_mutex2);
218 g_test_add_func ("/thread/mutex3", test_mutex3);
219 g_test_add_func ("/thread/mutex4", test_mutex4);
220 g_test_add_func ("/thread/mutex5", test_mutex5);
221  
222 if (g_test_perf ())
223 {
224 gint i;
225  
226 g_test_add_data_func ("/thread/mutex/perf/uncontended", NULL, test_mutex_perf);
227  
228 for (i = 1; i <= 10; i++)
229 {
230 gchar name[80];
231 sprintf (name, "/thread/mutex/perf/contended/%d", i);
232 g_test_add_data_func (name, GINT_TO_POINTER (i), test_mutex_perf);
233 }
234 }
235  
236 return g_test_run ();
237 }