| 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 | * 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. |
| 21 | */ |
| 22 | |
| 23 | #include <stdio.h> |
| 24 | #include <pthread.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <sys/types.h> |
| 28 | #include <sys/wait.h> |
| 29 | #include <unistd.h> |
| 30 | #include <stdio.h> |
| 31 | #include <assert.h> |
| 32 | #include <sys/syscall.h> |
| 33 | |
| 34 | #if defined(_syscall0) |
| 35 | _syscall0(pid_t, gettid) |
| 36 | #elif defined(__NR_gettid) |
| 37 | static inline pid_t gettid(void) |
| 38 | { |
| 39 | return syscall(__NR_gettid); |
| 40 | } |
| 41 | #else |
| 42 | #warning "use pid as tid" |
| 43 | static inline pid_t gettid(void) |
| 44 | { |
| 45 | return getpid(); |
| 46 | } |
| 47 | #endif |
| 48 | |
| 49 | #ifndef DYNAMIC_LINK_TEST |
| 50 | #define _LGPL_SOURCE |
| 51 | #else |
| 52 | #define debug_yield_read() |
| 53 | #endif |
| 54 | #include "urcu.h" |
| 55 | |
| 56 | struct test_array { |
| 57 | int a; |
| 58 | }; |
| 59 | |
| 60 | pthread_rwlock_t lock = PTHREAD_RWLOCK_INITIALIZER; |
| 61 | |
| 62 | static volatile int test_go; |
| 63 | |
| 64 | static int wdelay; |
| 65 | |
| 66 | static struct test_array test_array = { 8 }; |
| 67 | |
| 68 | static unsigned long duration; |
| 69 | static time_t start_time; |
| 70 | static unsigned long __thread duration_interval; |
| 71 | #define DURATION_TEST_DELAY_WRITE 4 |
| 72 | #define DURATION_TEST_DELAY_READ 100 |
| 73 | |
| 74 | /* |
| 75 | * returns 0 if test should end. |
| 76 | */ |
| 77 | static int test_duration_write(void) |
| 78 | { |
| 79 | if (duration_interval++ >= DURATION_TEST_DELAY_WRITE) { |
| 80 | duration_interval = 0; |
| 81 | if (time(NULL) - start_time >= duration) |
| 82 | return 0; |
| 83 | } |
| 84 | return 1; |
| 85 | } |
| 86 | |
| 87 | static int test_duration_read(void) |
| 88 | { |
| 89 | if (duration_interval++ >= DURATION_TEST_DELAY_READ) { |
| 90 | duration_interval = 0; |
| 91 | if (time(NULL) - start_time >= duration) |
| 92 | return 0; |
| 93 | } |
| 94 | return 1; |
| 95 | } |
| 96 | |
| 97 | static unsigned long long __thread nr_writes; |
| 98 | static unsigned long long __thread nr_reads; |
| 99 | |
| 100 | static unsigned int nr_readers; |
| 101 | static unsigned int nr_writers; |
| 102 | |
| 103 | pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER; |
| 104 | |
| 105 | void rcu_copy_mutex_lock(void) |
| 106 | { |
| 107 | int ret; |
| 108 | ret = pthread_mutex_lock(&rcu_copy_mutex); |
| 109 | if (ret) { |
| 110 | perror("Error in pthread mutex lock"); |
| 111 | exit(-1); |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | void rcu_copy_mutex_unlock(void) |
| 116 | { |
| 117 | int ret; |
| 118 | |
| 119 | ret = pthread_mutex_unlock(&rcu_copy_mutex); |
| 120 | if (ret) { |
| 121 | perror("Error in pthread mutex unlock"); |
| 122 | exit(-1); |
| 123 | } |
| 124 | } |
| 125 | |
| 126 | void *thr_reader(void *_count) |
| 127 | { |
| 128 | unsigned long long *count = _count; |
| 129 | |
| 130 | printf("thread_begin %s, thread id : %lx, tid %lu\n", |
| 131 | "reader", pthread_self(), (unsigned long)gettid()); |
| 132 | |
| 133 | while (!test_go) |
| 134 | { |
| 135 | } |
| 136 | |
| 137 | for (;;) { |
| 138 | pthread_rwlock_rdlock(&lock); |
| 139 | assert(test_array.a == 8); |
| 140 | pthread_rwlock_unlock(&lock); |
| 141 | nr_reads++; |
| 142 | if (!test_duration_read()) |
| 143 | break; |
| 144 | } |
| 145 | |
| 146 | *count = nr_reads; |
| 147 | printf("thread_end %s, thread id : %lx, tid %lu\n", |
| 148 | "reader", pthread_self(), (unsigned long)gettid()); |
| 149 | return ((void*)1); |
| 150 | |
| 151 | } |
| 152 | |
| 153 | void *thr_writer(void *_count) |
| 154 | { |
| 155 | unsigned long long *count = _count; |
| 156 | |
| 157 | printf("thread_begin %s, thread id : %lx, tid %lu\n", |
| 158 | "writer", pthread_self(), (unsigned long)gettid()); |
| 159 | |
| 160 | while (!test_go) |
| 161 | { |
| 162 | } |
| 163 | |
| 164 | for (;;) { |
| 165 | pthread_rwlock_wrlock(&lock); |
| 166 | test_array.a = 8; |
| 167 | pthread_rwlock_unlock(&lock); |
| 168 | nr_writes++; |
| 169 | if (!test_duration_write()) |
| 170 | break; |
| 171 | if (wdelay) |
| 172 | usleep(wdelay); |
| 173 | } |
| 174 | |
| 175 | printf("thread_end %s, thread id : %lx, tid %lu\n", |
| 176 | "writer", pthread_self(), (unsigned long)gettid()); |
| 177 | *count = nr_writes; |
| 178 | return ((void*)2); |
| 179 | } |
| 180 | |
| 181 | void show_usage(int argc, char **argv) |
| 182 | { |
| 183 | printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]); |
| 184 | #ifdef DEBUG_YIELD |
| 185 | printf(" [-r] [-w] (yield reader and/or writer)"); |
| 186 | #endif |
| 187 | printf(" [-d delay] (writer period)"); |
| 188 | printf("\n"); |
| 189 | } |
| 190 | |
| 191 | int main(int argc, char **argv) |
| 192 | { |
| 193 | int err; |
| 194 | pthread_t *tid_reader, *tid_writer; |
| 195 | void *tret; |
| 196 | unsigned long long *count_reader, *count_writer; |
| 197 | unsigned long long tot_reads = 0, tot_writes = 0; |
| 198 | int i; |
| 199 | |
| 200 | if (argc < 4) { |
| 201 | show_usage(argc, argv); |
| 202 | return -1; |
| 203 | } |
| 204 | |
| 205 | err = sscanf(argv[1], "%u", &nr_readers); |
| 206 | if (err != 1) { |
| 207 | show_usage(argc, argv); |
| 208 | return -1; |
| 209 | } |
| 210 | |
| 211 | err = sscanf(argv[2], "%u", &nr_writers); |
| 212 | if (err != 1) { |
| 213 | show_usage(argc, argv); |
| 214 | return -1; |
| 215 | } |
| 216 | |
| 217 | err = sscanf(argv[3], "%lu", &duration); |
| 218 | if (err != 1) { |
| 219 | show_usage(argc, argv); |
| 220 | return -1; |
| 221 | } |
| 222 | |
| 223 | for (i = 4; i < argc; i++) { |
| 224 | if (argv[i][0] != '-') |
| 225 | continue; |
| 226 | switch (argv[i][1]) { |
| 227 | #ifdef DEBUG_YIELD |
| 228 | case 'r': |
| 229 | yield_active |= YIELD_READ; |
| 230 | break; |
| 231 | case 'w': |
| 232 | yield_active |= YIELD_WRITE; |
| 233 | break; |
| 234 | #endif |
| 235 | case 'd': |
| 236 | if (argc < i + 2) { |
| 237 | show_usage(argc, argv); |
| 238 | return -1; |
| 239 | } |
| 240 | wdelay = atoi(argv[++i]); |
| 241 | break; |
| 242 | } |
| 243 | } |
| 244 | |
| 245 | printf("running test for %lu seconds, %u readers, %u writers.\n", |
| 246 | duration, nr_readers, nr_writers); |
| 247 | printf("Writer delay : %u us.\n", wdelay); |
| 248 | start_time = time(NULL); |
| 249 | printf("thread %-6s, thread id : %lx, tid %lu\n", |
| 250 | "main", pthread_self(), (unsigned long)gettid()); |
| 251 | |
| 252 | tid_reader = malloc(sizeof(*tid_reader) * nr_readers); |
| 253 | tid_writer = malloc(sizeof(*tid_writer) * nr_writers); |
| 254 | count_reader = malloc(sizeof(*count_reader) * nr_readers); |
| 255 | count_writer = malloc(sizeof(*count_writer) * nr_writers); |
| 256 | |
| 257 | for (i = 0; i < nr_readers; i++) { |
| 258 | err = pthread_create(&tid_reader[i], NULL, thr_reader, |
| 259 | &count_reader[i]); |
| 260 | if (err != 0) |
| 261 | exit(1); |
| 262 | } |
| 263 | for (i = 0; i < nr_writers; i++) { |
| 264 | err = pthread_create(&tid_writer[i], NULL, thr_writer, |
| 265 | &count_writer[i]); |
| 266 | if (err != 0) |
| 267 | exit(1); |
| 268 | } |
| 269 | |
| 270 | test_go = 1; |
| 271 | |
| 272 | for (i = 0; i < nr_readers; i++) { |
| 273 | err = pthread_join(tid_reader[i], &tret); |
| 274 | if (err != 0) |
| 275 | exit(1); |
| 276 | tot_reads += count_reader[i]; |
| 277 | } |
| 278 | for (i = 0; i < nr_writers; i++) { |
| 279 | err = pthread_join(tid_writer[i], &tret); |
| 280 | if (err != 0) |
| 281 | exit(1); |
| 282 | tot_writes += count_writer[i]; |
| 283 | } |
| 284 | |
| 285 | printf("total number of reads : %llu, writes %llu\n", tot_reads, |
| 286 | tot_writes); |
| 287 | free(tid_reader); |
| 288 | free(tid_writer); |
| 289 | free(count_reader); |
| 290 | free(count_writer); |
| 291 | return 0; |
| 292 | } |