cleanup: all functions have declarations (-Wmissing-prototypes)
[urcu.git] / tests / benchmark / test_rwlock_timing.c
1 /*
2 * test_urcu.c
3 *
4 * Userspace RCU library - test program
5 *
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
7 *
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
21 */
22
23 #include <stdio.h>
24 #include <pthread.h>
25 #include <stdlib.h>
26 #include <string.h>
27 #include <sys/types.h>
28 #include <sys/wait.h>
29 #include <unistd.h>
30 #include <stdio.h>
31 #include <assert.h>
32 #include <pthread.h>
33 #include <errno.h>
34
35 #include <urcu/arch.h>
36
37 #include "thread-id.h"
38
39 #include <urcu.h>
40
41 struct test_array {
42 int a;
43 };
44
45 /*
46 * static rwlock initializer is broken on Cygwin. Use runtime
47 * initialization.
48 */
49 pthread_rwlock_t lock;
50
51 static struct test_array test_array = { 8 };
52
53 #define OUTER_READ_LOOP 200U
54 #define INNER_READ_LOOP 100000U
55 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
56
57 #define OUTER_WRITE_LOOP 10U
58 #define INNER_WRITE_LOOP 200U
59 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
60
61 static int num_read;
62 static int num_write;
63
64 #define NR_READ num_read
65 #define NR_WRITE num_write
66
67 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *reader_time;
68 static caa_cycles_t __attribute__((aligned(CAA_CACHE_LINE_SIZE))) *writer_time;
69
70 static
71 void *thr_reader(void *arg)
72 {
73 unsigned int i, j;
74 int ret;
75 caa_cycles_t time1, time2;
76
77 printf("thread_begin %s, tid %lu\n",
78 "reader", urcu_get_thread_id());
79 sleep(2);
80
81 time1 = caa_get_cycles();
82 for (i = 0; i < OUTER_READ_LOOP; i++) {
83 for (j = 0; j < INNER_READ_LOOP; j++) {
84 ret = pthread_rwlock_rdlock(&lock);
85 if (ret) {
86 fprintf(stderr, "reader pthread_rwlock_rdlock: %s\n", strerror(ret));
87 abort();
88 }
89
90 assert(test_array.a == 8);
91
92 ret = pthread_rwlock_unlock(&lock);
93 if (ret) {
94 fprintf(stderr, "reader pthread_rwlock_unlock: %s\n", strerror(ret));
95 abort();
96 }
97 }
98 }
99 time2 = caa_get_cycles();
100
101 reader_time[(unsigned long)arg] = time2 - time1;
102
103 sleep(2);
104 printf("thread_end %s, tid %lu\n",
105 "reader", urcu_get_thread_id());
106 return ((void*)1);
107
108 }
109
110 static
111 void *thr_writer(void *arg)
112 {
113 unsigned int i, j;
114 int ret;
115 caa_cycles_t time1, time2;
116
117 printf("thread_begin %s, tid %lu\n",
118 "writer", urcu_get_thread_id());
119 sleep(2);
120
121 for (i = 0; i < OUTER_WRITE_LOOP; i++) {
122 for (j = 0; j < INNER_WRITE_LOOP; j++) {
123 time1 = caa_get_cycles();
124 ret = pthread_rwlock_wrlock(&lock);
125 if (ret) {
126 fprintf(stderr, "writer pthread_rwlock_wrlock: %s\n", strerror(ret));
127 abort();
128 }
129
130 test_array.a = 8;
131
132 ret = pthread_rwlock_unlock(&lock);
133 if (ret) {
134 fprintf(stderr, "writer pthread_rwlock_unlock: %s\n", strerror(ret));
135 abort();
136 }
137
138 time2 = caa_get_cycles();
139 writer_time[(unsigned long)arg] += time2 - time1;
140 usleep(1);
141 }
142 }
143
144 printf("thread_end %s, tid %lu\n",
145 "writer", urcu_get_thread_id());
146 return ((void*)2);
147 }
148
149 int main(int argc, char **argv)
150 {
151 int err;
152 pthread_t *tid_reader, *tid_writer;
153 void *tret;
154 int i;
155 caa_cycles_t tot_rtime = 0;
156 caa_cycles_t tot_wtime = 0;
157
158 if (argc < 2) {
159 printf("Usage : %s nr_readers nr_writers\n", argv[0]);
160 exit(-1);
161 }
162 num_read = atoi(argv[1]);
163 num_write = atoi(argv[2]);
164
165 err = pthread_rwlock_init(&lock, NULL);
166 if (err != 0) {
167 fprintf(stderr, "pthread_rwlock_init: (%d) %s\n", err, strerror(err));
168 exit(1);
169 }
170
171 reader_time = calloc(num_read, sizeof(*reader_time));
172 writer_time = calloc(num_write, sizeof(*writer_time));
173 tid_reader = calloc(num_read, sizeof(*tid_reader));
174 tid_writer = calloc(num_write, sizeof(*tid_writer));
175
176 printf("thread %-6s, tid %lu\n",
177 "main", urcu_get_thread_id());
178
179 for (i = 0; i < NR_READ; i++) {
180 err = pthread_create(&tid_reader[i], NULL, thr_reader,
181 (void *)(long)i);
182 if (err != 0)
183 exit(1);
184 }
185 for (i = 0; i < NR_WRITE; i++) {
186 err = pthread_create(&tid_writer[i], NULL, thr_writer,
187 (void *)(long)i);
188 if (err != 0)
189 exit(1);
190 }
191
192 sleep(10);
193
194 for (i = 0; i < NR_READ; i++) {
195 err = pthread_join(tid_reader[i], &tret);
196 if (err != 0)
197 exit(1);
198 tot_rtime += reader_time[i];
199 }
200 for (i = 0; i < NR_WRITE; i++) {
201 err = pthread_join(tid_writer[i], &tret);
202 if (err != 0)
203 exit(1);
204 tot_wtime += writer_time[i];
205 }
206 printf("Time per read : %g cycles\n",
207 (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
208 printf("Time per write : %g cycles\n",
209 (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
210
211 err = pthread_rwlock_destroy(&lock);
212 if (err != 0) {
213 fprintf(stderr, "pthread_rwlock_destroy: (%d) %s\n", err, strerror(err));
214 exit(1);
215 }
216 free(reader_time);
217 free(writer_time);
218 free(tid_reader);
219 free(tid_writer);
220
221 return 0;
222 }
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