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20bf310a MD |
1 | /* |
2 | * test_urcu.c | |
3 | * | |
4 | * Userspace RCU library - test program | |
5 | * | |
6 | * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> | |
7 | * | |
af02d47e MD |
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. | |
20bf310a MD |
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 <sys/syscall.h> | |
33 | #include <pthread.h> | |
ec4e58a3 | 34 | #include <urcu/arch.h> |
20bf310a MD |
35 | |
36 | #if defined(_syscall0) | |
37 | _syscall0(pid_t, gettid) | |
38 | #elif defined(__NR_gettid) | |
39 | static inline pid_t gettid(void) | |
40 | { | |
41 | return syscall(__NR_gettid); | |
42 | } | |
43 | #else | |
44 | #warning "use pid as tid" | |
45 | static inline pid_t gettid(void) | |
46 | { | |
47 | return getpid(); | |
48 | } | |
49 | #endif | |
50 | ||
ec4e58a3 | 51 | #include <urcu.h> |
20bf310a MD |
52 | |
53 | struct test_array { | |
54 | int a; | |
55 | }; | |
56 | ||
57 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
58 | ||
59 | static struct test_array test_array = { 8 }; | |
60 | ||
61 | #define OUTER_READ_LOOP 200U | |
62 | #define INNER_READ_LOOP 100000U | |
63 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
64 | ||
102d1d23 MD |
65 | #define OUTER_WRITE_LOOP 10U |
66 | #define INNER_WRITE_LOOP 200U | |
67 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
20bf310a | 68 | |
2c9689fe MD |
69 | static int num_read; |
70 | static int num_write; | |
20bf310a | 71 | |
2c9689fe MD |
72 | #define NR_READ num_read |
73 | #define NR_WRITE num_write | |
74 | ||
b430c6d4 MD |
75 | static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time; |
76 | static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time; | |
20bf310a MD |
77 | |
78 | void *thr_reader(void *arg) | |
79 | { | |
80 | int i, j; | |
81 | cycles_t time1, time2; | |
82 | ||
83 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
84 | "reader", pthread_self(), (unsigned long)gettid()); | |
85 | sleep(2); | |
86 | ||
87 | time1 = get_cycles(); | |
88 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
89 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
90 | pthread_rwlock_rdlock(&lock); | |
91 | assert(test_array.a == 8); | |
92 | pthread_rwlock_unlock(&lock); | |
93 | } | |
94 | } | |
95 | time2 = get_cycles(); | |
96 | ||
97 | reader_time[(unsigned long)arg] = time2 - time1; | |
98 | ||
99 | sleep(2); | |
100 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
101 | "reader", pthread_self(), (unsigned long)gettid()); | |
102 | return ((void*)1); | |
103 | ||
104 | } | |
105 | ||
106 | void *thr_writer(void *arg) | |
107 | { | |
102d1d23 MD |
108 | int i, j; |
109 | cycles_t time1, time2; | |
20bf310a MD |
110 | |
111 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
112 | "writer", pthread_self(), (unsigned long)gettid()); | |
113 | sleep(2); | |
114 | ||
102d1d23 MD |
115 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { |
116 | for (j = 0; j < INNER_WRITE_LOOP; j++) { | |
117 | time1 = get_cycles(); | |
118 | pthread_rwlock_wrlock(&lock); | |
119 | test_array.a = 8; | |
120 | pthread_rwlock_unlock(&lock); | |
121 | time2 = get_cycles(); | |
122 | writer_time[(unsigned long)arg] += time2 - time1; | |
123 | usleep(1); | |
124 | } | |
20bf310a MD |
125 | } |
126 | ||
127 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
128 | "writer", pthread_self(), (unsigned long)gettid()); | |
129 | return ((void*)2); | |
130 | } | |
131 | ||
2c9689fe | 132 | int main(int argc, char **argv) |
20bf310a MD |
133 | { |
134 | int err; | |
2c9689fe | 135 | pthread_t *tid_reader, *tid_writer; |
20bf310a MD |
136 | void *tret; |
137 | int i; | |
102d1d23 MD |
138 | cycles_t tot_rtime = 0; |
139 | cycles_t tot_wtime = 0; | |
20bf310a | 140 | |
2c9689fe MD |
141 | if (argc < 2) { |
142 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
143 | exit(-1); | |
144 | } | |
145 | num_read = atoi(argv[1]); | |
146 | num_write = atoi(argv[2]); | |
147 | ||
148 | reader_time = malloc(sizeof(*reader_time) * num_read); | |
149 | writer_time = malloc(sizeof(*writer_time) * num_write); | |
150 | tid_reader = malloc(sizeof(*tid_reader) * num_read); | |
151 | tid_writer = malloc(sizeof(*tid_writer) * num_write); | |
152 | ||
20bf310a MD |
153 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
154 | "main", pthread_self(), (unsigned long)gettid()); | |
155 | ||
156 | for (i = 0; i < NR_READ; i++) { | |
157 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
158 | (void *)(long)i); | |
159 | if (err != 0) | |
160 | exit(1); | |
161 | } | |
162 | for (i = 0; i < NR_WRITE; i++) { | |
102d1d23 MD |
163 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
164 | (void *)(long)i); | |
20bf310a MD |
165 | if (err != 0) |
166 | exit(1); | |
167 | } | |
168 | ||
169 | sleep(10); | |
170 | ||
171 | for (i = 0; i < NR_READ; i++) { | |
172 | err = pthread_join(tid_reader[i], &tret); | |
173 | if (err != 0) | |
174 | exit(1); | |
102d1d23 | 175 | tot_rtime += reader_time[i]; |
20bf310a MD |
176 | } |
177 | for (i = 0; i < NR_WRITE; i++) { | |
178 | err = pthread_join(tid_writer[i], &tret); | |
179 | if (err != 0) | |
180 | exit(1); | |
102d1d23 | 181 | tot_wtime += writer_time[i]; |
20bf310a MD |
182 | } |
183 | printf("Time per read : %g cycles\n", | |
102d1d23 MD |
184 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); |
185 | printf("Time per write : %g cycles\n", | |
186 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
20bf310a | 187 | |
2c9689fe MD |
188 | free(reader_time); |
189 | free(writer_time); | |
190 | free(tid_reader); | |
191 | free(tid_writer); | |
192 | ||
20bf310a MD |
193 | return 0; |
194 | } |