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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 | ||
37 | #define rdtscll(val) do { \ | |
38 | unsigned int __a,__d; \ | |
39 | asm volatile("rdtsc" : "=a" (__a), "=d" (__d)); \ | |
40 | (val) = ((unsigned long)__a) | (((unsigned long)__d)<<32); \ | |
41 | } while(0) | |
42 | ||
43 | typedef unsigned long long cycles_t; | |
44 | ||
45 | static inline cycles_t get_cycles (void) | |
46 | { | |
47 | unsigned long long ret = 0; | |
48 | ||
49 | rdtscll(ret); | |
50 | return ret; | |
51 | } | |
52 | ||
53 | #include "urcu.h" | |
54 | ||
c265818b MD |
55 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
56 | ||
57 | void rcu_copy_mutex_lock(void) | |
58 | { | |
59 | int ret; | |
60 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
61 | if (ret) { | |
62 | perror("Error in pthread mutex lock"); | |
63 | exit(-1); | |
64 | } | |
65 | } | |
66 | ||
67 | void rcu_copy_mutex_unlock(void) | |
68 | { | |
69 | int ret; | |
70 | ||
71 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
72 | if (ret) { | |
73 | perror("Error in pthread mutex unlock"); | |
74 | exit(-1); | |
75 | } | |
76 | } | |
77 | ||
20bf310a MD |
78 | struct test_array { |
79 | int a; | |
80 | }; | |
81 | ||
82 | static struct test_array *test_rcu_pointer; | |
83 | ||
84 | #define OUTER_READ_LOOP 2000U | |
85 | #define INNER_READ_LOOP 100000U | |
86 | #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP) | |
87 | ||
88 | #define WRITE_LOOP 2000U | |
89 | ||
90 | #define NR_READ 10 | |
91 | #define NR_WRITE 9 | |
92 | ||
93 | static cycles_t reader_time[NR_READ] __attribute__((aligned(128))); | |
94 | ||
95 | void *thr_reader(void *arg) | |
96 | { | |
1430ee0b | 97 | int i, j; |
20bf310a MD |
98 | struct test_array *local_ptr; |
99 | cycles_t time1, time2; | |
100 | ||
101 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
102 | "reader", pthread_self(), (unsigned long)gettid()); | |
103 | sleep(2); | |
104 | ||
105 | urcu_register_thread(); | |
106 | ||
107 | time1 = get_cycles(); | |
108 | for (i = 0; i < OUTER_READ_LOOP; i++) { | |
109 | for (j = 0; j < INNER_READ_LOOP; j++) { | |
1430ee0b | 110 | rcu_read_lock(); |
20bf310a MD |
111 | local_ptr = rcu_dereference(test_rcu_pointer); |
112 | if (local_ptr) { | |
113 | assert(local_ptr->a == 8); | |
114 | } | |
1430ee0b | 115 | rcu_read_unlock(); |
20bf310a MD |
116 | } |
117 | } | |
118 | time2 = get_cycles(); | |
119 | ||
120 | urcu_unregister_thread(); | |
121 | ||
122 | reader_time[(unsigned long)arg] = time2 - time1; | |
123 | ||
124 | sleep(2); | |
125 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
126 | "reader", pthread_self(), (unsigned long)gettid()); | |
127 | return ((void*)1); | |
128 | ||
129 | } | |
130 | ||
131 | void *thr_writer(void *arg) | |
132 | { | |
133 | int i; | |
134 | struct test_array *new, *old; | |
135 | ||
136 | printf("thread_begin %s, thread id : %lx, tid %lu\n", | |
137 | "writer", pthread_self(), (unsigned long)gettid()); | |
138 | sleep(2); | |
139 | ||
140 | for (i = 0; i < WRITE_LOOP; i++) { | |
141 | new = malloc(sizeof(struct test_array)); | |
c265818b | 142 | rcu_copy_mutex_lock(); |
20bf310a MD |
143 | old = test_rcu_pointer; |
144 | if (old) { | |
145 | assert(old->a == 8); | |
146 | } | |
147 | new->a = 8; | |
f4a486ac | 148 | old = urcu_publish_content(&test_rcu_pointer, new); |
c265818b | 149 | rcu_copy_mutex_unlock(); |
20bf310a MD |
150 | /* can be done after unlock */ |
151 | if (old) { | |
152 | old->a = 0; | |
153 | } | |
154 | free(old); | |
155 | usleep(1); | |
156 | } | |
157 | ||
158 | printf("thread_end %s, thread id : %lx, tid %lu\n", | |
159 | "writer", pthread_self(), (unsigned long)gettid()); | |
160 | return ((void*)2); | |
161 | } | |
162 | ||
163 | int main() | |
164 | { | |
165 | int err; | |
166 | pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; | |
167 | void *tret; | |
168 | int i; | |
169 | cycles_t tot_time = 0; | |
170 | ||
171 | printf("thread %-6s, thread id : %lx, tid %lu\n", | |
172 | "main", pthread_self(), (unsigned long)gettid()); | |
173 | ||
174 | for (i = 0; i < NR_READ; i++) { | |
175 | err = pthread_create(&tid_reader[i], NULL, thr_reader, | |
176 | (void *)(long)i); | |
177 | if (err != 0) | |
178 | exit(1); | |
179 | } | |
180 | for (i = 0; i < NR_WRITE; i++) { | |
181 | err = pthread_create(&tid_writer[i], NULL, thr_writer, NULL); | |
182 | if (err != 0) | |
183 | exit(1); | |
184 | } | |
185 | ||
186 | sleep(10); | |
187 | ||
188 | for (i = 0; i < NR_READ; i++) { | |
189 | err = pthread_join(tid_reader[i], &tret); | |
190 | if (err != 0) | |
191 | exit(1); | |
192 | tot_time += reader_time[i]; | |
193 | } | |
194 | for (i = 0; i < NR_WRITE; i++) { | |
195 | err = pthread_join(tid_writer[i], &tret); | |
196 | if (err != 0) | |
197 | exit(1); | |
198 | } | |
199 | free(test_rcu_pointer); | |
200 | printf("Time per read : %g cycles\n", | |
201 | (double)tot_time / ((double)NR_READ * (double)READ_LOOP)); | |
202 | ||
203 | return 0; | |
204 | } |