test_perthreadlock.c

   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 #define _GNU_SOURCE
  24 #include <stdio.h>
  25 #include <pthread.h>
  26 #include <stdlib.h>
  27 #include <string.h>
  28 #include <sys/types.h>
  29 #include <sys/wait.h>
  30 #include <unistd.h>
  31 #include <stdio.h>
  32 #include <assert.h>
  33 #include <sys/syscall.h>
  34 #include <sched.h>
  35
  36 #include "arch.h"
  37
  38 #if defined(_syscall0)
  39 _syscall0(pid_t, gettid)
  40 #elif defined(__NR_gettid)
  41 static inline pid_t gettid(void)
  42 {
  43         return syscall(__NR_gettid);
  44 }
  45 #else
  46 #warning "use pid as tid"
  47 static inline pid_t gettid(void)
  48 {
  49         return getpid();
  50 }
  51 #endif
  52
  53 #ifndef DYNAMIC_LINK_TEST
  54 #define _LGPL_SOURCE
  55 #else
  56 #define debug_yield_read()
  57 #endif
  58 #include "urcu.h"
  59
  60 struct test_array {
  61         int a;
  62 };
  63
  64 struct per_thread_lock {
  65         pthread_mutex_t lock;
  66 } __attribute__((aligned(128)));        /* cache-line aligned */
  67
  68 static struct per_thread_lock *per_thread_lock;
  69
  70 static volatile int test_go, test_stop;
  71
  72 static int wdelay;
  73
  74 static volatile struct test_array test_array = { 8 };
  75
  76 static unsigned long duration;
  77
  78 /* read-side C.S. duration, in loops */
  79 static unsigned long rduration;
  80
  81 static inline void loop_sleep(unsigned long l)
  82 {
  83         while(l-- != 0)
  84                 cpu_relax();
  85 }
  86
  87 /*
  88  * returns 0 if test should end.
  89  */
  90 static int test_duration_write(void)
  91 {
  92         return !test_stop;
  93 }
  94
  95 static int test_duration_read(void)
  96 {
  97         return !test_stop;
  98 }
  99
 100 static unsigned long long __thread nr_writes;
 101 static unsigned long long __thread nr_reads;
 102
 103 static unsigned long long __attribute__((aligned(128))) *tot_nr_writes;
 104 static unsigned long long __attribute__((aligned(128))) *tot_nr_reads;
 105
 106 static unsigned int nr_readers;
 107 static unsigned int nr_writers;
 108
 109 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
 110
 111 void rcu_copy_mutex_lock(void)
 112 {
 113         int ret;
 114         ret = pthread_mutex_lock(&rcu_copy_mutex);
 115         if (ret) {
 116                 perror("Error in pthread mutex lock");
 117                 exit(-1);
 118         }
 119 }
 120
 121 void rcu_copy_mutex_unlock(void)
 122 {
 123         int ret;
 124
 125         ret = pthread_mutex_unlock(&rcu_copy_mutex);
 126         if (ret) {
 127                 perror("Error in pthread mutex unlock");
 128                 exit(-1);
 129         }
 130 }
 131
 132 void *thr_reader(void *data)
 133 {
 134         unsigned long tidx = (unsigned long)data;
 135
 136         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 137                         "reader", pthread_self(), (unsigned long)gettid());
 138
 139         while (!test_go)
 140         {
 141         }
 142
 143         for (;;) {
 144                 pthread_mutex_lock(&per_thread_lock[tidx].lock);
 145                 assert(test_array.a == 8);
 146                 if (unlikely(rduration))
 147                         loop_sleep(rduration);
 148                 pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 149                 nr_reads++;
 150                 if (unlikely(!test_duration_read()))
 151                         break;
 152         }
 153
 154         tot_nr_reads[tidx] = nr_reads;
 155         printf("thread_end %s, thread id : %lx, tid %lu\n",
 156                         "reader", pthread_self(), (unsigned long)gettid());
 157         return ((void*)1);
 158
 159 }
 160
 161 void *thr_writer(void *data)
 162 {
 163         unsigned long wtidx = (unsigned long)data;
 164         long tidx;
 165
 166         printf("thread_begin %s, thread id : %lx, tid %lu\n",
 167                         "writer", pthread_self(), (unsigned long)gettid());
 168
 169         while (!test_go)
 170         {
 171         }
 172         smp_mb();
 173
 174         for (;;) {
 175                 for (tidx = 0; tidx < nr_readers; tidx++) {
 176                         pthread_mutex_lock(&per_thread_lock[tidx].lock);
 177                 }
 178                 test_array.a = 0;
 179                 test_array.a = 8;
 180                 for (tidx = nr_readers - 1; tidx >= 0; tidx--) {
 181                         pthread_mutex_unlock(&per_thread_lock[tidx].lock);
 182                 }
 183                 nr_writes++;
 184                 if (unlikely(!test_duration_write()))
 185                         break;
 186                 if (unlikely(wdelay))
 187                         usleep(wdelay);
 188         }
 189
 190         printf("thread_end %s, thread id : %lx, tid %lu\n",
 191                         "writer", pthread_self(), (unsigned long)gettid());
 192         tot_nr_writes[wtidx] = nr_writes;
 193         return ((void*)2);
 194 }
 195
 196 void show_usage(int argc, char **argv)
 197 {
 198         printf("Usage : %s nr_readers nr_writers duration (s)", argv[0]);
 199 #ifdef DEBUG_YIELD
 200         printf(" [-r] [-w] (yield reader and/or writer)");
 201 #endif
 202         printf(" [-d delay] (writer period (us))");
 203         printf(" [-c duration] (reader C.S. duration (in loops))");
 204         printf(" [-a cpu#] [-a cpu#]... (affinity)");
 205         printf("\n");
 206 }
 207
 208 cpu_set_t affinity;
 209
 210 int main(int argc, char **argv)
 211 {
 212         int err;
 213         pthread_t *tid_reader, *tid_writer;
 214         void *tret;
 215         unsigned long long *count_reader, *count_writer;
 216         unsigned long long tot_reads = 0, tot_writes = 0;
 217         int i, a;
 218         int use_affinity = 0;
 219
 220         if (argc < 4) {
 221                 show_usage(argc, argv);
 222                 return -1;
 223         }
 224         smp_mb();
 225
 226         err = sscanf(argv[1], "%u", &nr_readers);
 227         if (err != 1) {
 228                 show_usage(argc, argv);
 229                 return -1;
 230         }
 231
 232         err = sscanf(argv[2], "%u", &nr_writers);
 233         if (err != 1) {
 234                 show_usage(argc, argv);
 235                 return -1;
 236         }
 237
 238         err = sscanf(argv[3], "%lu", &duration);
 239         if (err != 1) {
 240                 show_usage(argc, argv);
 241                 return -1;
 242         }
 243
 244         CPU_ZERO(&affinity);
 245
 246         for (i = 4; i < argc; i++) {
 247                 if (argv[i][0] != '-')
 248                         continue;
 249                 switch (argv[i][1]) {
 250 #ifdef DEBUG_YIELD
 251                 case 'r':
 252                         yield_active |= YIELD_READ;
 253                         break;
 254                 case 'w':
 255                         yield_active |= YIELD_WRITE;
 256                         break;
 257 #endif
 258                 case 'a':
 259                         if (argc < i + 2) {
 260                                 show_usage(argc, argv);
 261                                 return -1;
 262                         }
 263                         a = atoi(argv[++i]);
 264                         CPU_SET(a, &affinity);
 265                         use_affinity = 1;
 266                         printf("Adding CPU %d affinity\n", a);
 267                         break;
 268                 case 'c':
 269                         if (argc < i + 2) {
 270                                 show_usage(argc, argv);
 271                                 return -1;
 272                         }
 273                         rduration = atoi(argv[++i]);
 274                         break;
 275                 case 'd':
 276                         if (argc < i + 2) {
 277                                 show_usage(argc, argv);
 278                                 return -1;
 279                         }
 280                         wdelay = atoi(argv[++i]);
 281                         break;
 282                 }
 283         }
 284
 285         printf("running test for %lu seconds, %u readers, %u writers.\n",
 286                 duration, nr_readers, nr_writers);
 287         printf("Writer delay : %u us.\n", wdelay);
 288         printf("thread %-6s, thread id : %lx, tid %lu\n",
 289                         "main", pthread_self(), (unsigned long)gettid());
 290
 291         if (use_affinity
 292             && sched_setaffinity(0, sizeof(affinity), &affinity) < 0) {
 293                 perror("sched_setaffinity");
 294                 exit(-1);
 295         }
 296
 297         tid_reader = malloc(sizeof(*tid_reader) * nr_readers);
 298         tid_writer = malloc(sizeof(*tid_writer) * nr_writers);
 299         count_reader = malloc(sizeof(*count_reader) * nr_readers);
 300         count_writer = malloc(sizeof(*count_writer) * nr_writers);
 301         tot_nr_reads = malloc(sizeof(*tot_nr_reads) * nr_readers);
 302         tot_nr_writes = malloc(sizeof(*tot_nr_writes) * nr_writers);
 303         per_thread_lock = malloc(sizeof(*per_thread_lock) * nr_readers);
 304
 305         for (i = 0; i < nr_readers; i++) {
 306                 err = pthread_create(&tid_reader[i], NULL, thr_reader,
 307                                      (void *)(long)i);
 308                 if (err != 0)
 309                         exit(1);
 310         }
 311         for (i = 0; i < nr_writers; i++) {
 312                 err = pthread_create(&tid_writer[i], NULL, thr_writer,
 313                                      (void *)(long)i);
 314                 if (err != 0)
 315                         exit(1);
 316         }
 317
 318         smp_mb();
 319
 320         test_go = 1;
 321
 322         sleep(duration);
 323
 324         test_stop = 1;
 325
 326         for (i = 0; i < nr_readers; i++) {
 327                 err = pthread_join(tid_reader[i], &tret);
 328                 if (err != 0)
 329                         exit(1);
 330                 tot_reads += tot_nr_reads[i];
 331         }
 332         for (i = 0; i < nr_writers; i++) {
 333                 err = pthread_join(tid_writer[i], &tret);
 334                 if (err != 0)
 335                         exit(1);
 336                 tot_writes += tot_nr_writes[i];
 337         }
 338
 339         printf("total number of reads : %llu, writes %llu\n", tot_reads,
 340                tot_writes);
 341         free(tid_reader);
 342         free(tid_writer);
 343         free(count_reader);
 344         free(count_writer);
 345         free(tot_nr_reads);
 346         free(tot_nr_writes);
 347         free(per_thread_lock);
 348         return 0;
 349 }