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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 | ||
d8540fc5 | 23 | #define _GNU_SOURCE |
20bf310a MD |
24 | #include <stdio.h> |
25 | #include <pthread.h> | |
26 | #include <stdlib.h> | |
27 | #include <string.h> | |
28 | #include <sys/types.h> | |
29 | #include <sys/wait.h> | |
30 | #include <unistd.h> | |
31 | #include <stdio.h> | |
32 | #include <assert.h> | |
33 | #include <sys/syscall.h> | |
34 | #include <pthread.h> | |
94b343fd PM |
35 | #include <errno.h> |
36 | ||
ec4e58a3 | 37 | #include <urcu/arch.h> |
20bf310a MD |
38 | |
39 | #if defined(_syscall0) | |
40 | _syscall0(pid_t, gettid) | |
41 | #elif defined(__NR_gettid) | |
42 | static inline pid_t gettid(void) | |
43 | { | |
44 | return syscall(__NR_gettid); | |
45 | } | |
46 | #else | |
47 | #warning "use pid as tid" | |
48 | static inline pid_t gettid(void) | |
49 | { | |
50 | return getpid(); | |
51 | } | |
52 | #endif | |
53 | ||
ec4e58a3 | 54 | #include <urcu.h> |
20bf310a MD |
55 | |
56 | struct test_array { | |
57 | int a; | |
58 | }; | |
59 | ||
60 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; | |
61 | ||
62 | static struct test_array test_array = { 8 }; | |
63 | ||
64 | #define OUTER_READ_LOOP 200U | |
65 | #define INNER_READ_LOOP 100000U | |
66 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
67 | ||
102d1d23 MD |
68 | #define OUTER_WRITE_LOOP 10U |
69 | #define INNER_WRITE_LOOP 200U | |
70 | #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP) | |
20bf310a | 71 | |
2c9689fe MD |
72 | static int num_read; |
73 | static int num_write; | |
20bf310a | 74 | |
2c9689fe MD |
75 | #define NR_READ num_read |
76 | #define NR_WRITE num_write | |
77 | ||
b430c6d4 MD |
78 | static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *reader_time; |
79 | static cycles_t __attribute__((aligned(CACHE_LINE_SIZE))) *writer_time; | |
20bf310a MD |
80 | |
81 | void *thr_reader(void *arg) | |
82 | { | |
83 | int i, j; | |
84 | cycles_t time1, time2; | |
85 | ||
86 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
87 | "reader", pthread_self(), (unsigned long)gettid()); | |
88 | sleep(2); | |
89 | ||
90 | time1 = get_cycles(); | |
91 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
92 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
93 | pthread_rwlock_rdlock(&lock); | |
94 | assert(test_array.a == 8); | |
95 | pthread_rwlock_unlock(&lock); | |
96 | } | |
97 | } | |
98 | time2 = get_cycles(); | |
99 | ||
100 | reader_time[(unsigned long)arg] = time2 - time1; | |
101 | ||
102 | sleep(2); | |
103 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
104 | "reader", pthread_self(), (unsigned long)gettid()); | |
105 | return ((void*)1); | |
106 | ||
107 | } | |
108 | ||
109 | void *thr_writer(void *arg) | |
110 | { | |
102d1d23 MD |
111 | int i, j; |
112 | cycles_t time1, time2; | |
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113 | |
114 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
115 | "writer", pthread_self(), (unsigned long)gettid()); | |
116 | sleep(2); | |
117 | ||
102d1d23 MD |
118 | for (i = 0; i < OUTER_WRITE_LOOP; i++) { |
119 | for (j = 0; j < INNER_WRITE_LOOP; j++) { | |
120 | time1 = get_cycles(); | |
121 | pthread_rwlock_wrlock(&lock); | |
122 | test_array.a = 8; | |
123 | pthread_rwlock_unlock(&lock); | |
124 | time2 = get_cycles(); | |
125 | writer_time[(unsigned long)arg] += time2 - time1; | |
126 | usleep(1); | |
127 | } | |
20bf310a MD |
128 | } |
129 | ||
130 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
131 | "writer", pthread_self(), (unsigned long)gettid()); | |
132 | return ((void*)2); | |
133 | } | |
134 | ||
2c9689fe | 135 | int main(int argc, char **argv) |
20bf310a MD |
136 | { |
137 | int err; | |
2c9689fe | 138 | pthread_t *tid_reader, *tid_writer; |
20bf310a MD |
139 | void *tret; |
140 | int i; | |
102d1d23 MD |
141 | cycles_t tot_rtime = 0; |
142 | cycles_t tot_wtime = 0; | |
20bf310a | 143 | |
2c9689fe MD |
144 | if (argc < 2) { |
145 | printf("Usage : %s nr_readers nr_writers\n", argv[0]); | |
146 | exit(-1); | |
147 | } | |
148 | num_read = atoi(argv[1]); | |
149 | num_write = atoi(argv[2]); | |
150 | ||
151 | reader_time = malloc(sizeof(*reader_time) * num_read); | |
152 | writer_time = malloc(sizeof(*writer_time) * num_write); | |
153 | tid_reader = malloc(sizeof(*tid_reader) * num_read); | |
154 | tid_writer = malloc(sizeof(*tid_writer) * num_write); | |
155 | ||
20bf310a MD |
156 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
157 | "main", pthread_self(), (unsigned long)gettid()); | |
158 | ||
159 | for (i = 0; i < NR_READ; i++) { | |
160 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
161 | (void *)(long)i); | |
162 | if (err != 0) | |
163 | exit(1); | |
164 | } | |
165 | for (i = 0; i < NR_WRITE; i++) { | |
102d1d23 MD |
166 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
167 | (void *)(long)i); | |
20bf310a MD |
168 | if (err != 0) |
169 | exit(1); | |
170 | } | |
171 | ||
172 | sleep(10); | |
173 | ||
174 | for (i = 0; i < NR_READ; i++) { | |
175 | err = pthread_join(tid_reader[i], &tret); | |
176 | if (err != 0) | |
177 | exit(1); | |
102d1d23 | 178 | tot_rtime += reader_time[i]; |
20bf310a MD |
179 | } |
180 | for (i = 0; i < NR_WRITE; i++) { | |
181 | err = pthread_join(tid_writer[i], &tret); | |
182 | if (err != 0) | |
183 | exit(1); | |
102d1d23 | 184 | tot_wtime += writer_time[i]; |
20bf310a MD |
185 | } |
186 | printf("Time per read : %g cycles\n", | |
102d1d23 MD |
187 | (double)tot_rtime / ((double)NR_READ * (double)READ_LOOP)); |
188 | printf("Time per write : %g cycles\n", | |
189 | (double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP)); | |
20bf310a | 190 | |
2c9689fe MD |
191 | free(reader_time); |
192 | free(writer_time); | |
193 | free(tid_reader); | |
194 | free(tid_writer); | |
195 | ||
20bf310a MD |
196 | return 0; |
197 | } |