4 * Userspace RCU library - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
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.
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.
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.
28 #include <sys/types.h>
33 #include <sys/syscall.h>
38 #if defined(_syscall0)
39 _syscall0(pid_t
, gettid
)
40 #elif defined(__NR_gettid)
41 static inline pid_t
gettid(void)
43 return syscall(__NR_gettid
);
46 #warning "use pid as tid"
47 static inline pid_t
gettid(void)
53 #ifndef DYNAMIC_LINK_TEST
56 #define debug_yield_read()
64 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
66 static volatile int test_go
, test_stop
;
70 static volatile struct test_array test_array
= { 8 };
72 static unsigned long duration
;
74 /* read-side C.S. duration, in loops */
75 static unsigned long rduration
;
77 static inline void loop_sleep(unsigned long l
)
84 * returns 0 if test should end.
86 static int test_duration_write(void)
91 static int test_duration_read(void)
96 static unsigned long long __thread nr_writes
;
97 static unsigned long long __thread nr_reads
;
99 static unsigned int nr_readers
;
100 static unsigned int nr_writers
;
102 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
104 void rcu_copy_mutex_lock(void)
107 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
109 perror("Error in pthread mutex lock");
114 void rcu_copy_mutex_unlock(void)
118 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
120 perror("Error in pthread mutex unlock");
125 void *thr_reader(void *_count
)
127 unsigned long long *count
= _count
;
129 printf("thread_begin %s, thread id : %lx, tid %lu\n",
130 "reader", pthread_self(), (unsigned long)gettid());
137 pthread_rwlock_rdlock(&lock
);
138 assert(test_array
.a
== 8);
139 if (unlikely(rduration
))
140 loop_sleep(rduration
);
141 pthread_rwlock_unlock(&lock
);
143 if (unlikely(!test_duration_read()))
148 printf("thread_end %s, thread id : %lx, tid %lu\n",
149 "reader", pthread_self(), (unsigned long)gettid());
154 void *thr_writer(void *_count
)
156 unsigned long long *count
= _count
;
158 printf("thread_begin %s, thread id : %lx, tid %lu\n",
159 "writer", pthread_self(), (unsigned long)gettid());
167 pthread_rwlock_wrlock(&lock
);
170 pthread_rwlock_unlock(&lock
);
172 if (unlikely(!test_duration_write()))
174 if (unlikely(wdelay
))
178 printf("thread_end %s, thread id : %lx, tid %lu\n",
179 "writer", pthread_self(), (unsigned long)gettid());
184 void show_usage(int argc
, char **argv
)
186 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
188 printf(" [-r] [-w] (yield reader and/or writer)");
190 printf(" [-d delay] (writer period (us))");
191 printf(" [-c duration] (reader C.S. duration (in loops))");
192 printf(" [-a cpu#] [-a cpu#]... (affinity)");
198 int main(int argc
, char **argv
)
201 pthread_t
*tid_reader
, *tid_writer
;
203 unsigned long long *count_reader
, *count_writer
;
204 unsigned long long tot_reads
= 0, tot_writes
= 0;
206 int use_affinity
= 0;
209 show_usage(argc
, argv
);
214 err
= sscanf(argv
[1], "%u", &nr_readers
);
216 show_usage(argc
, argv
);
220 err
= sscanf(argv
[2], "%u", &nr_writers
);
222 show_usage(argc
, argv
);
226 err
= sscanf(argv
[3], "%lu", &duration
);
228 show_usage(argc
, argv
);
234 for (i
= 4; i
< argc
; i
++) {
235 if (argv
[i
][0] != '-')
237 switch (argv
[i
][1]) {
240 yield_active
|= YIELD_READ
;
243 yield_active
|= YIELD_WRITE
;
248 show_usage(argc
, argv
);
252 CPU_SET(a
, &affinity
);
254 printf("Adding CPU %d affinity\n", a
);
258 show_usage(argc
, argv
);
261 rduration
= atoi(argv
[++i
]);
265 show_usage(argc
, argv
);
268 wdelay
= atoi(argv
[++i
]);
273 printf("running test for %lu seconds, %u readers, %u writers.\n",
274 duration
, nr_readers
, nr_writers
);
275 printf("Writer delay : %u us.\n", wdelay
);
276 printf("Reader duration : %lu loops.\n", rduration
);
277 printf("thread %-6s, thread id : %lx, tid %lu\n",
278 "main", pthread_self(), (unsigned long)gettid());
280 && sched_setaffinity(0, sizeof(affinity
), &affinity
) < 0) {
281 perror("sched_setaffinity");
285 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
286 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
287 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
288 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
290 for (i
= 0; i
< nr_readers
; i
++) {
291 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
296 for (i
= 0; i
< nr_writers
; i
++) {
297 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
311 for (i
= 0; i
< nr_readers
; i
++) {
312 err
= pthread_join(tid_reader
[i
], &tret
);
315 tot_reads
+= count_reader
[i
];
317 for (i
= 0; i
< nr_writers
; i
++) {
318 err
= pthread_join(tid_writer
[i
], &tret
);
321 tot_writes
+= count_writer
[i
];
324 printf("total number of reads : %llu, writes %llu\n", tot_reads
,