Commit | Line | Data |
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b257a10b 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 | ||
ac260fd9 | 11 | #include <stdio.h> |
f69f195a MD |
12 | #include <pthread.h> |
13 | #include <stdlib.h> | |
41718ff9 | 14 | #include <string.h> |
f69f195a MD |
15 | #include <sys/types.h> |
16 | #include <sys/wait.h> | |
17 | #include <unistd.h> | |
18 | #include <stdio.h> | |
41718ff9 | 19 | #include <assert.h> |
87bd15cd BW |
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 | ||
ac260fd9 MD |
37 | #include "urcu.h" |
38 | ||
41718ff9 MD |
39 | struct test_array { |
40 | int a; | |
41718ff9 MD |
41 | }; |
42 | ||
bb488185 MD |
43 | static int no_writer_delay; |
44 | ||
41718ff9 MD |
45 | static struct test_array *test_rcu_pointer; |
46 | ||
cf380c2f MD |
47 | static unsigned long duration; |
48 | static time_t start_time; | |
49 | static unsigned long __thread duration_interval; | |
50 | #define DURATION_TEST_DELAY 100 | |
51 | ||
52 | /* | |
53 | * returns 0 if test should end. | |
54 | */ | |
55 | static int test_duration(void) | |
56 | { | |
57 | if (duration_interval++ >= DURATION_TEST_DELAY) { | |
58 | duration_interval = 0; | |
59 | if (time(NULL) - start_time >= duration) | |
60 | return 0; | |
61 | } | |
62 | return 1; | |
63 | } | |
64 | ||
b1b5ce8f | 65 | #define NR_READ 10 |
8c8eed97 | 66 | #define NR_WRITE 9 |
f69f195a | 67 | |
1eec319e MD |
68 | static unsigned long long __thread nr_writes; |
69 | static unsigned long long __thread nr_reads; | |
70 | ||
c265818b MD |
71 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
72 | ||
73 | void rcu_copy_mutex_lock(void) | |
74 | { | |
75 | int ret; | |
76 | ret = pthread_mutex_lock(&rcu_copy_mutex); | |
77 | if (ret) { | |
78 | perror("Error in pthread mutex lock"); | |
79 | exit(-1); | |
80 | } | |
81 | } | |
82 | ||
83 | void rcu_copy_mutex_unlock(void) | |
84 | { | |
85 | int ret; | |
86 | ||
87 | ret = pthread_mutex_unlock(&rcu_copy_mutex); | |
88 | if (ret) { | |
89 | perror("Error in pthread mutex unlock"); | |
90 | exit(-1); | |
91 | } | |
92 | } | |
f69f195a | 93 | |
bb488185 MD |
94 | /* |
95 | * malloc/free are reusing memory areas too quickly, which does not let us | |
96 | * test races appropriately. Use a large circular array for allocations. | |
97 | * ARRAY_SIZE is larger than NR_WRITE, which insures we never run over our tail. | |
98 | */ | |
99 | #define ARRAY_SIZE (1048576 * NR_WRITE) | |
100 | #define ARRAY_POISON 0xDEADBEEF | |
101 | static int array_index; | |
102 | static struct test_array test_array[ARRAY_SIZE]; | |
103 | ||
104 | static struct test_array *test_array_alloc(void) | |
105 | { | |
106 | struct test_array *ret; | |
107 | int index; | |
108 | ||
109 | rcu_copy_mutex_lock(); | |
110 | index = array_index % ARRAY_SIZE; | |
111 | assert(test_array[index].a == ARRAY_POISON || | |
112 | test_array[index].a == 0); | |
113 | ret = &test_array[index]; | |
114 | array_index++; | |
115 | if (array_index == ARRAY_SIZE) | |
116 | array_index = 0; | |
117 | rcu_copy_mutex_unlock(); | |
118 | return ret; | |
119 | } | |
120 | ||
121 | static void test_array_free(struct test_array *ptr) | |
122 | { | |
123 | if (!ptr) | |
124 | return; | |
125 | rcu_copy_mutex_lock(); | |
126 | ptr->a = ARRAY_POISON; | |
127 | rcu_copy_mutex_unlock(); | |
128 | } | |
129 | ||
1eec319e | 130 | void *thr_reader(void *_count) |
f69f195a | 131 | { |
1eec319e | 132 | unsigned long long *count = _count; |
41718ff9 MD |
133 | struct test_array *local_ptr; |
134 | ||
cf380c2f | 135 | printf("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 136 | "reader", pthread_self(), (unsigned long)gettid()); |
f69f195a MD |
137 | |
138 | urcu_register_thread(); | |
139 | ||
cf380c2f | 140 | for (;;) { |
1430ee0b | 141 | rcu_read_lock(); |
cf380c2f | 142 | local_ptr = rcu_dereference(test_rcu_pointer); |
bb488185 | 143 | debug_yield_read(); |
cf380c2f MD |
144 | if (local_ptr) |
145 | assert(local_ptr->a == 8); | |
1430ee0b | 146 | rcu_read_unlock(); |
1eec319e | 147 | nr_reads++; |
cf380c2f MD |
148 | if (!test_duration()) |
149 | break; | |
41718ff9 | 150 | } |
f69f195a MD |
151 | |
152 | urcu_unregister_thread(); | |
41718ff9 | 153 | |
1eec319e | 154 | *count = nr_reads; |
cf380c2f MD |
155 | printf("thread_end %s, thread id : %lx, tid %lu\n", |
156 | "reader", pthread_self(), (unsigned long)gettid()); | |
f69f195a MD |
157 | return ((void*)1); |
158 | ||
159 | } | |
160 | ||
1eec319e | 161 | void *thr_writer(void *_count) |
f69f195a | 162 | { |
1eec319e | 163 | unsigned long long *count = _count; |
41718ff9 | 164 | struct test_array *new, *old; |
f69f195a | 165 | |
cf380c2f | 166 | printf("thread_begin %s, thread id : %lx, tid %lu\n", |
87bd15cd | 167 | "writer", pthread_self(), (unsigned long)gettid()); |
f69f195a | 168 | |
cf380c2f | 169 | for (;;) { |
bb488185 | 170 | new = test_array_alloc(); |
c265818b | 171 | rcu_copy_mutex_lock(); |
41718ff9 | 172 | old = test_rcu_pointer; |
cf380c2f | 173 | if (old) |
41718ff9 | 174 | assert(old->a == 8); |
ad6ce6ae | 175 | new->a = 8; |
f4a486ac | 176 | old = urcu_publish_content(&test_rcu_pointer, new); |
c265818b | 177 | rcu_copy_mutex_unlock(); |
41718ff9 | 178 | /* can be done after unlock */ |
cf380c2f | 179 | if (old) |
8c8eed97 | 180 | old->a = 0; |
bb488185 | 181 | test_array_free(old); |
1eec319e | 182 | nr_writes++; |
cf380c2f MD |
183 | if (!test_duration()) |
184 | break; | |
bb488185 MD |
185 | if (!no_writer_delay) |
186 | usleep(1); | |
f69f195a MD |
187 | } |
188 | ||
cf380c2f MD |
189 | printf("thread_end %s, thread id : %lx, tid %lu\n", |
190 | "writer", pthread_self(), (unsigned long)gettid()); | |
1eec319e | 191 | *count = nr_writes; |
f69f195a MD |
192 | return ((void*)2); |
193 | } | |
ac260fd9 | 194 | |
1430ee0b MD |
195 | void show_usage(int argc, char **argv) |
196 | { | |
197 | printf("Usage : %s duration (s)", argv[0]); | |
198 | #ifdef DEBUG_YIELD | |
199 | printf(" [-r] [-w] (yield reader and/or writer)"); | |
200 | #endif | |
bb488185 | 201 | printf(" [-n] (disable writer delay)"); |
1430ee0b MD |
202 | printf("\n"); |
203 | } | |
204 | ||
cf380c2f | 205 | int main(int argc, char **argv) |
ac260fd9 | 206 | { |
f69f195a MD |
207 | int err; |
208 | pthread_t tid_reader[NR_READ], tid_writer[NR_WRITE]; | |
209 | void *tret; | |
1eec319e MD |
210 | unsigned long long count_reader[NR_READ], count_writer[NR_WRITE]; |
211 | unsigned long long tot_reads = 0, tot_writes = 0; | |
f69f195a MD |
212 | int i; |
213 | ||
cf380c2f | 214 | if (argc < 2) { |
1430ee0b | 215 | show_usage(argc, argv); |
cf380c2f MD |
216 | return -1; |
217 | } | |
218 | ||
219 | err = sscanf(argv[1], "%lu", &duration); | |
220 | if (err != 1) { | |
1430ee0b | 221 | show_usage(argc, argv); |
cf380c2f MD |
222 | return -1; |
223 | } | |
224 | ||
cf380c2f MD |
225 | for (i = 2; i < argc; i++) { |
226 | if (argv[i][0] != '-') | |
227 | continue; | |
228 | switch (argv[i][1]) { | |
bb488185 | 229 | #ifdef DEBUG_YIELD |
cf380c2f MD |
230 | case 'r': |
231 | yield_active |= YIELD_READ; | |
232 | break; | |
233 | case 'w': | |
234 | yield_active |= YIELD_WRITE; | |
235 | break; | |
bb488185 MD |
236 | #endif |
237 | case 'n': | |
238 | no_writer_delay = 1; | |
239 | break; | |
cf380c2f MD |
240 | } |
241 | } | |
cf380c2f MD |
242 | |
243 | printf("running test for %lu seconds.\n", duration); | |
244 | start_time = time(NULL); | |
87bd15cd BW |
245 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
246 | "main", pthread_self(), (unsigned long)gettid()); | |
247 | ||
f69f195a | 248 | for (i = 0; i < NR_READ; i++) { |
1eec319e MD |
249 | err = pthread_create(&tid_reader[i], NULL, thr_reader, |
250 | &count_reader[i]); | |
f69f195a MD |
251 | if (err != 0) |
252 | exit(1); | |
253 | } | |
254 | for (i = 0; i < NR_WRITE; i++) { | |
1eec319e MD |
255 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
256 | &count_writer[i]); | |
f69f195a MD |
257 | if (err != 0) |
258 | exit(1); | |
259 | } | |
260 | ||
20bf310a | 261 | for (i = 0; i < NR_READ; i++) { |
f69f195a MD |
262 | err = pthread_join(tid_reader[i], &tret); |
263 | if (err != 0) | |
264 | exit(1); | |
1eec319e | 265 | tot_reads += count_reader[i]; |
f69f195a MD |
266 | } |
267 | for (i = 0; i < NR_WRITE; i++) { | |
268 | err = pthread_join(tid_writer[i], &tret); | |
269 | if (err != 0) | |
270 | exit(1); | |
1eec319e | 271 | tot_writes += count_writer[i]; |
f69f195a | 272 | } |
1eec319e MD |
273 | printf("total number of reads : %llu, writes %llu\n", tot_reads, |
274 | tot_writes); | |
bb488185 | 275 | test_array_free(test_rcu_pointer); |
ac260fd9 | 276 | |
f69f195a | 277 | return 0; |
ac260fd9 | 278 | } |