Commit | Line | Data |
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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> | |
21 | ||
22 | #if defined(_syscall0) | |
23 | _syscall0(pid_t, gettid) | |
24 | #elif defined(__NR_gettid) | |
25 | static inline pid_t gettid(void) | |
26 | { | |
27 | return syscall(__NR_gettid); | |
28 | } | |
29 | #else | |
30 | #warning "use pid as tid" | |
31 | static inline pid_t gettid(void) | |
32 | { | |
33 | return getpid(); | |
34 | } | |
35 | #endif | |
36 | ||
20bf310a MD |
37 | #include "urcu.h" |
38 | ||
c265818b MD |
39 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
40 | ||
41 | void rcu_copy_mutex_lock(void) | |
42 | { | |
43 | int ret; | |
44 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
45 | if (ret) { | |
46 | perror("Error in pthread mutex lock"); | |
47 | exit(-1); | |
48 | } | |
49 | } | |
50 | ||
51 | void rcu_copy_mutex_unlock(void) | |
52 | { | |
53 | int ret; | |
54 | ||
55 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
56 | if (ret) { | |
57 | perror("Error in pthread mutex unlock"); | |
58 | exit(-1); | |
59 | } | |
60 | } | |
61 | ||
20bf310a MD |
62 | struct test_array { |
63 | int a; | |
64 | }; | |
65 | ||
66 | static struct test_array *test_rcu_pointer; | |
67 | ||
68 | #define OUTER_READ_LOOP 2000U | |
69 | #define INNER_READ_LOOP 100000U | |
70 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
71 | ||
72 | #define WRITE_LOOP 2000U | |
73 | ||
74 | #define NR_READ 10 | |
75 | #define NR_WRITE 9 | |
76 | ||
77 | static cycles_t reader_time[NR_READ] __attribute__((aligned(128))); | |
78 | ||
79 | void *thr_reader(void *arg) | |
80 | { | |
1430ee0b | 81 | int i, j; |
20bf310a MD |
82 | struct test_array *local_ptr; |
83 | cycles_t time1, time2; | |
84 | ||
85 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
86 | "reader", pthread_self(), (unsigned long)gettid()); | |
87 | sleep(2); | |
88 | ||
89 | urcu_register_thread(); | |
90 | ||
91 | time1 = get_cycles(); | |
92 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
93 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
1430ee0b | 94 | rcu_read_lock(); |
20bf310a MD |
95 | local_ptr = rcu_dereference(test_rcu_pointer); |
96 | if (local_ptr) { | |
97 | assert(local_ptr->a == 8); | |
98 | } | |
1430ee0b | 99 | rcu_read_unlock(); |
20bf310a MD |
100 | } |
101 | } | |
102 | time2 = get_cycles(); | |
103 | ||
104 | urcu_unregister_thread(); | |
105 | ||
106 | reader_time[(unsigned long)arg] = time2 - time1; | |
107 | ||
108 | sleep(2); | |
109 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
110 | "reader", pthread_self(), (unsigned long)gettid()); | |
111 | return ((void*)1); | |
112 | ||
113 | } | |
114 | ||
115 | void *thr_writer(void *arg) | |
116 | { | |
117 | int i; | |
118 | struct test_array *new, *old; | |
119 | ||
120 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
121 | "writer", pthread_self(), (unsigned long)gettid()); | |
122 | sleep(2); | |
123 | ||
124 | for (i = 0; i < WRITE_LOOP; i++) { | |
125 | new = malloc(sizeof(struct test_array)); | |
c265818b | 126 | rcu_copy_mutex_lock(); |
20bf310a MD |
127 | old = test_rcu_pointer; |
128 | if (old) { | |
129 | assert(old->a == 8); | |
130 | } | |
131 | new->a = 8; | |
f4a486ac | 132 | old = urcu_publish_content(&test_rcu_pointer, new); |
c265818b | 133 | rcu_copy_mutex_unlock(); |
20bf310a MD |
134 | /* can be done after unlock */ |
135 | if (old) { | |
136 | old->a = 0; | |
137 | } | |
138 | free(old); | |
139 | usleep(1); | |
140 | } | |
141 | ||
142 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
143 | "writer", pthread_self(), (unsigned long)gettid()); | |
144 | return ((void*)2); | |
145 | } | |
146 | ||
147 | int main() | |
148 | { | |
149 | int err; | |
150 | pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; | |
151 | void *tret; | |
152 | int i; | |
153 | cycles_t tot_time = 0; | |
154 | ||
155 | printf("thread %-6s, thread id : %lx, tid %lu\n", | |
156 | "main", pthread_self(), (unsigned long)gettid()); | |
157 | ||
158 | for (i = 0; i < NR_READ; i++) { | |
159 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
160 | (void *)(long)i); | |
161 | if (err != 0) | |
162 | exit(1); | |
163 | } | |
164 | for (i = 0; i < NR_WRITE; i++) { | |
165 | err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); | |
166 | if (err != 0) | |
167 | exit(1); | |
168 | } | |
169 | ||
170 | sleep(10); | |
171 | ||
172 | for (i = 0; i < NR_READ; i++) { | |
173 | err = pthread_join(tid_reader[i], &tret); | |
174 | if (err != 0) | |
175 | exit(1); | |
176 | tot_time += reader_time[i]; | |
177 | } | |
178 | for (i = 0; i < NR_WRITE; i++) { | |
179 | err = pthread_join(tid_writer[i], &tret); | |
180 | if (err != 0) | |
181 | exit(1); | |
182 | } | |
183 | free(test_rcu_pointer); | |
184 | printf("Time per read : %g cycles\n", | |
185 | (double)tot_time / ((double)NR_READ * (double)READ_LOOP)); | |
186 | ||
187 | return 0; | |
188 | } |