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>
36 #if defined(_syscall0)
37 _syscall0(pid_t
, gettid
)
38 #elif defined(__NR_gettid)
39 static inline pid_t
gettid(void)
41 return syscall(__NR_gettid
);
44 #warning "use pid as tid"
45 static inline pid_t
gettid(void)
52 #include "urcu-qsbr.h"
58 static volatile int test_go
;
62 static struct test_array
*test_rcu_pointer
;
64 static unsigned long duration
;
65 static time_t start_time
;
66 static unsigned long __thread duration_interval
;
67 #define DURATION_TEST_DELAY_WRITE 4
68 #define DURATION_TEST_DELAY_READ 100
71 * returns 0 if test should end.
73 static int test_duration_write(void)
75 if (duration_interval
++ >= DURATION_TEST_DELAY_WRITE
) {
76 duration_interval
= 0;
77 if (time(NULL
) - start_time
>= duration
)
83 static int test_duration_read(void)
85 if (duration_interval
++ >= DURATION_TEST_DELAY_READ
) {
86 duration_interval
= 0;
87 if (time(NULL
) - start_time
>= duration
)
93 static unsigned long long __thread nr_writes
;
94 static unsigned long long __thread nr_reads
;
96 static unsigned int nr_readers
;
97 static unsigned int nr_writers
;
99 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
101 void rcu_copy_mutex_lock(void)
104 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
106 perror("Error in pthread mutex lock");
111 void rcu_copy_mutex_unlock(void)
115 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
117 perror("Error in pthread mutex unlock");
123 * malloc/free are reusing memory areas too quickly, which does not let us
124 * test races appropriately. Use a large circular array for allocations.
125 * ARRAY_SIZE is larger than nr_writers, which insures we never run over our tail.
127 #define ARRAY_SIZE (1048576 * nr_writers)
128 #define ARRAY_POISON 0xDEADBEEF
129 static int array_index
;
130 static struct test_array
*test_array
;
132 static struct test_array
*test_array_alloc(void)
134 struct test_array
*ret
;
137 rcu_copy_mutex_lock();
138 index
= array_index
% ARRAY_SIZE
;
139 assert(test_array
[index
].a
== ARRAY_POISON
||
140 test_array
[index
].a
== 0);
141 ret
= &test_array
[index
];
143 if (array_index
== ARRAY_SIZE
)
145 rcu_copy_mutex_unlock();
149 static void test_array_free(struct test_array
*ptr
)
153 rcu_copy_mutex_lock();
154 ptr
->a
= ARRAY_POISON
;
155 rcu_copy_mutex_unlock();
158 void *thr_reader(void *_count
)
160 unsigned long long *count
= _count
;
161 struct test_array
*local_ptr
;
163 printf("thread_begin %s, thread id : %lx, tid %lu\n",
164 "reader", pthread_self(), (unsigned long)gettid());
166 rcu_register_thread();
175 local_ptr
= _rcu_dereference(test_rcu_pointer
);
178 assert(local_ptr
->a
== 8);
181 if (duration_interval
>= DURATION_TEST_DELAY_READ
- 1)
182 _rcu_quiescent_state();
183 if (!test_duration_read())
187 rcu_unregister_thread();
190 printf("thread_end %s, thread id : %lx, tid %lu\n",
191 "reader", pthread_self(), (unsigned long)gettid());
196 void *thr_writer(void *_count
)
198 unsigned long long *count
= _count
;
199 struct test_array
*new, *old
;
201 printf("thread_begin %s, thread id : %lx, tid %lu\n",
202 "writer", pthread_self(), (unsigned long)gettid());
210 new = test_array_alloc();
211 rcu_copy_mutex_lock();
212 old
= test_rcu_pointer
;
216 old
= _rcu_publish_content(&test_rcu_pointer
, new);
217 rcu_copy_mutex_unlock();
218 /* can be done after unlock */
221 test_array_free(old
);
223 if (!test_duration_write())
229 printf("thread_end %s, thread id : %lx, tid %lu\n",
230 "writer", pthread_self(), (unsigned long)gettid());
235 void show_usage(int argc
, char **argv
)
237 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
239 printf(" [-r] [-w] (yield reader and/or writer)");
241 printf(" [-d delay] (writer period (us))");
245 int main(int argc
, char **argv
)
248 pthread_t
*tid_reader
, *tid_writer
;
250 unsigned long long *count_reader
, *count_writer
;
251 unsigned long long tot_reads
= 0, tot_writes
= 0;
255 show_usage(argc
, argv
);
259 err
= sscanf(argv
[1], "%u", &nr_readers
);
261 show_usage(argc
, argv
);
265 err
= sscanf(argv
[2], "%u", &nr_writers
);
267 show_usage(argc
, argv
);
271 err
= sscanf(argv
[3], "%lu", &duration
);
273 show_usage(argc
, argv
);
277 for (i
= 4; i
< argc
; i
++) {
278 if (argv
[i
][0] != '-')
280 switch (argv
[i
][1]) {
283 yield_active
|= YIELD_READ
;
286 yield_active
|= YIELD_WRITE
;
291 show_usage(argc
, argv
);
294 wdelay
= atoi(argv
[++i
]);
299 printf("running test for %lu seconds, %u readers, %u writers.\n",
300 duration
, nr_readers
, nr_writers
);
301 printf("Writer delay : %u us.\n", wdelay
);
302 printf("thread %-6s, thread id : %lx, tid %lu\n",
303 "main", pthread_self(), (unsigned long)gettid());
305 test_array
= malloc(sizeof(*test_array
) * ARRAY_SIZE
);
306 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
307 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
308 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
309 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
311 for (i
= 0; i
< nr_readers
; i
++) {
312 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
317 for (i
= 0; i
< nr_writers
; i
++) {
318 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
324 start_time
= time(NULL
);
328 for (i
= 0; i
< nr_readers
; i
++) {
329 err
= pthread_join(tid_reader
[i
], &tret
);
332 tot_reads
+= count_reader
[i
];
334 for (i
= 0; i
< nr_writers
; i
++) {
335 err
= pthread_join(tid_writer
[i
], &tret
);
338 tot_writes
+= count_writer
[i
];
341 printf("total number of reads : %llu, writes %llu\n", tot_reads
,
343 test_array_free(test_rcu_pointer
);