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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 | * | |
8 | * Distributed under GPLv2 | |
9 | */ | |
10 | ||
11 | #include <stdio.h> | |
12 | #include <pthread.h> | |
13 | #include <stdlib.h> | |
14 | #include <string.h> | |
15 | #include <sys/types.h> | |
16 | #include <sys/wait.h> | |
17 | #include <unistd.h> | |
18 | #include <stdio.h> | |
19 | #include <assert.h> | |
20 | #include <sys/syscall.h> | |
121a5d44 | 21 | #include <arch.h> |
20bf310a MD |
22 | |
23 | #if defined(_syscall0) | |
24 | _syscall0(pid_t, gettid) | |
25 | #elif defined(__NR_gettid) | |
26 | static inline pid_t gettid(void) | |
27 | { | |
28 | return syscall(__NR_gettid); | |
29 | } | |
30 | #else | |
31 | #warning "use pid as tid" | |
32 | static inline pid_t gettid(void) | |
33 | { | |
34 | return getpid(); | |
35 | } | |
36 | #endif | |
37 | ||
121a5d44 | 38 | #define _LGPL_SOURCE |
20bf310a MD |
39 | #include "urcu.h" |
40 | ||
c265818b MD |
41 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
42 | ||
43 | void rcu_copy_mutex_lock(void) | |
44 | { | |
45 | int ret; | |
46 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
47 | if (ret) { | |
48 | perror("Error in pthread mutex lock"); | |
49 | exit(-1); | |
50 | } | |
51 | } | |
52 | ||
53 | void rcu_copy_mutex_unlock(void) | |
54 | { | |
55 | int ret; | |
56 | ||
57 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
58 | if (ret) { | |
59 | perror("Error in pthread mutex unlock"); | |
60 | exit(-1); | |
61 | } | |
62 | } | |
63 | ||
20bf310a MD |
64 | struct test_array { |
65 | int a; | |
66 | }; | |
67 | ||
68 | static struct test_array *test_rcu_pointer; | |
69 | ||
70 | #define OUTER_READ_LOOP 2000U | |
71 | #define INNER_READ_LOOP 100000U | |
72 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
73 | ||
74 | #define WRITE_LOOP 2000U | |
75 | ||
76 | #define NR_READ 10 | |
77 | #define NR_WRITE 9 | |
78 | ||
79 | static cycles_t reader_time[NR_READ] __attribute__((aligned(128))); | |
80 | ||
81 | void *thr_reader(void *arg) | |
82 | { | |
1430ee0b | 83 | int i, j; |
20bf310a MD |
84 | struct test_array *local_ptr; |
85 | cycles_t time1, time2; | |
86 | ||
87 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
88 | "reader", pthread_self(), (unsigned long)gettid()); | |
89 | sleep(2); | |
90 | ||
121a5d44 | 91 | rcu_register_thread(); |
20bf310a MD |
92 | |
93 | time1 = get_cycles(); | |
94 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
95 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
1430ee0b | 96 | rcu_read_lock(); |
20bf310a MD |
97 | local_ptr = rcu_dereference(test_rcu_pointer); |
98 | if (local_ptr) { | |
99 | assert(local_ptr->a == 8); | |
100 | } | |
1430ee0b | 101 | rcu_read_unlock(); |
20bf310a MD |
102 | } |
103 | } | |
104 | time2 = get_cycles(); | |
105 | ||
121a5d44 | 106 | rcu_unregister_thread(); |
20bf310a MD |
107 | |
108 | reader_time[(unsigned long)arg] = time2 - time1; | |
109 | ||
110 | sleep(2); | |
111 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
112 | "reader", pthread_self(), (unsigned long)gettid()); | |
113 | return ((void*)1); | |
114 | ||
115 | } | |
116 | ||
117 | void *thr_writer(void *arg) | |
118 | { | |
119 | int i; | |
120 | struct test_array *new, *old; | |
121 | ||
122 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
123 | "writer", pthread_self(), (unsigned long)gettid()); | |
124 | sleep(2); | |
125 | ||
126 | for (i = 0; i < WRITE_LOOP; i++) { | |
127 | new = malloc(sizeof(struct test_array)); | |
c265818b | 128 | rcu_copy_mutex_lock(); |
20bf310a MD |
129 | old = test_rcu_pointer; |
130 | if (old) { | |
131 | assert(old->a == 8); | |
132 | } | |
133 | new->a = 8; | |
121a5d44 | 134 | old = rcu_publish_content(&test_rcu_pointer, new); |
c265818b | 135 | rcu_copy_mutex_unlock(); |
20bf310a MD |
136 | /* can be done after unlock */ |
137 | if (old) { | |
138 | old->a = 0; | |
139 | } | |
140 | free(old); | |
141 | usleep(1); | |
142 | } | |
143 | ||
144 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
145 | "writer", pthread_self(), (unsigned long)gettid()); | |
146 | return ((void*)2); | |
147 | } | |
148 | ||
149 | int main() | |
150 | { | |
151 | int err; | |
152 | pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; | |
153 | void *tret; | |
154 | int i; | |
155 | cycles_t tot_time = 0; | |
156 | ||
157 | printf("thread %-6s, thread id : %lx, tid %lu\n", | |
158 | "main", pthread_self(), (unsigned long)gettid()); | |
159 | ||
160 | for (i = 0; i < NR_READ; i++) { | |
161 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
162 | (void *)(long)i); | |
163 | if (err != 0) | |
164 | exit(1); | |
165 | } | |
166 | for (i = 0; i < NR_WRITE; i++) { | |
167 | err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); | |
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); | |
178 | tot_time += reader_time[i]; | |
179 | } | |
180 | for (i = 0; i < NR_WRITE; i++) { | |
181 | err = pthread_join(tid_writer[i], &tret); | |
182 | if (err != 0) | |
183 | exit(1); | |
184 | } | |
185 | free(test_rcu_pointer); | |
186 | printf("Time per read : %g cycles\n", | |
187 | (double)tot_time / ((double)NR_READ * (double)READ_LOOP)); | |
188 | ||
189 | return 0; | |
190 | } |