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.
27 #include <sys/types.h>
32 #include <sys/syscall.h>
34 #if defined(_syscall0)
35 _syscall0(pid_t
, gettid
)
36 #elif defined(__NR_gettid)
37 static inline pid_t
gettid(void)
39 return syscall(__NR_gettid
);
42 #warning "use pid as tid"
43 static inline pid_t
gettid(void)
50 #include "urcu-qsbr.h"
56 static volatile int test_go
;
60 static struct test_array
*test_rcu_pointer
;
62 static unsigned long duration
;
63 static time_t start_time
;
64 static unsigned long __thread duration_interval
;
65 #define DURATION_TEST_DELAY_WRITE 4
66 #define DURATION_TEST_DELAY_READ 100
69 * returns 0 if test should end.
71 static int test_duration_write(void)
73 if (duration_interval
++ >= DURATION_TEST_DELAY_WRITE
) {
74 duration_interval
= 0;
75 if (time(NULL
) - start_time
>= duration
)
81 static int test_duration_read(void)
83 if (duration_interval
++ >= DURATION_TEST_DELAY_READ
) {
84 duration_interval
= 0;
85 if (time(NULL
) - start_time
>= duration
)
91 static unsigned long long __thread nr_writes
;
92 static unsigned long long __thread nr_reads
;
94 static unsigned int nr_readers
;
95 static unsigned int nr_writers
;
97 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
99 void rcu_copy_mutex_lock(void)
102 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
104 perror("Error in pthread mutex lock");
109 void rcu_copy_mutex_unlock(void)
113 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
115 perror("Error in pthread mutex unlock");
121 * malloc/free are reusing memory areas too quickly, which does not let us
122 * test races appropriately. Use a large circular array for allocations.
123 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
125 #define ARRAY_SIZE (1048576 * nr_writers)
126 #define ARRAY_POISON 0xDEADBEEF
127 static int array_index
;
128 static struct test_array
*test_array
;
130 static struct test_array
*test_array_alloc(void)
132 struct test_array
*ret
;
135 rcu_copy_mutex_lock();
136 index
= array_index
% ARRAY_SIZE
;
137 assert(test_array
[index
].a
== ARRAY_POISON
||
138 test_array
[index
].a
== 0);
139 ret
= &test_array
[index
];
141 if (array_index
== ARRAY_SIZE
)
143 rcu_copy_mutex_unlock();
147 static void test_array_free(struct test_array
*ptr
)
151 rcu_copy_mutex_lock();
152 ptr
->a
= ARRAY_POISON
;
153 rcu_copy_mutex_unlock();
156 void *thr_reader(void *_count
)
158 unsigned long long *count
= _count
;
159 struct test_array
*local_ptr
;
161 printf("thread_begin %s, thread id : %lx, tid %lu\n",
162 "reader", pthread_self(), (unsigned long)gettid());
164 rcu_register_thread();
172 local_ptr
= _rcu_dereference(test_rcu_pointer
);
175 assert(local_ptr
->a
== 8);
178 if (duration_interval
>= DURATION_TEST_DELAY_READ
- 1)
179 _rcu_quiescent_state();
180 if (!test_duration_read())
184 rcu_unregister_thread();
187 printf("thread_end %s, thread id : %lx, tid %lu\n",
188 "reader", pthread_self(), (unsigned long)gettid());
193 void *thr_writer(void *_count
)
195 unsigned long long *count
= _count
;
196 struct test_array
*new, *old
;
198 printf("thread_begin %s, thread id : %lx, tid %lu\n",
199 "writer", pthread_self(), (unsigned long)gettid());
206 new = test_array_alloc();
207 rcu_copy_mutex_lock();
208 old
= test_rcu_pointer
;
212 old
= _rcu_publish_content(&test_rcu_pointer
, new);
213 rcu_copy_mutex_unlock();
214 /* can be done after unlock */
217 test_array_free(old
);
219 if (!test_duration_write())
225 printf("thread_end %s, thread id : %lx, tid %lu\n",
226 "writer", pthread_self(), (unsigned long)gettid());
231 void show_usage(int argc
, char **argv
)
233 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
235 printf(" [-r] [-w] (yield reader and/or writer)");
237 printf(" [-d delay] (writer period)");
241 int main(int argc
, char **argv
)
244 pthread_t
*tid_reader
, *tid_writer
;
246 unsigned long long *count_reader
, *count_writer
;
247 unsigned long long tot_reads
= 0, tot_writes
= 0;
251 show_usage(argc
, argv
);
255 err
= sscanf(argv
[1], "%u", &nr_readers
);
257 show_usage(argc
, argv
);
261 err
= sscanf(argv
[2], "%u", &nr_writers
);
263 show_usage(argc
, argv
);
267 err
= sscanf(argv
[3], "%lu", &duration
);
269 show_usage(argc
, argv
);
273 for (i
= 4; i
< argc
; i
++) {
274 if (argv
[i
][0] != '-')
276 switch (argv
[i
][1]) {
279 yield_active
|= YIELD_READ
;
282 yield_active
|= YIELD_WRITE
;
287 show_usage(argc
, argv
);
290 wdelay
= atoi(argv
[++i
]);
295 printf("running test for %lu seconds, %u readers, %u writers.\n",
296 duration
, nr_readers
, nr_writers
);
297 printf("Writer delay : %u us.\n", wdelay
);
298 start_time
= time(NULL
);
299 printf("thread %-6s, thread id : %lx, tid %lu\n",
300 "main", pthread_self(), (unsigned long)gettid());
302 test_array
= malloc(sizeof(*test_array
) * ARRAY_SIZE
);
303 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
304 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
305 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
306 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
308 for (i
= 0; i
< nr_readers
; i
++) {
309 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
314 for (i
= 0; i
< nr_writers
; i
++) {
315 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
323 for (i
= 0; i
< nr_readers
; i
++) {
324 err
= pthread_join(tid_reader
[i
], &tret
);
327 tot_reads
+= count_reader
[i
];
329 for (i
= 0; i
< nr_writers
; i
++) {
330 err
= pthread_join(tid_writer
[i
], &tret
);
333 tot_writes
+= count_writer
[i
];
336 printf("total number of reads : %llu, writes %llu\n", tot_reads
,
338 test_array_free(test_rcu_pointer
);