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 struct per_thread_lock
{
66 } __attribute__((aligned(128))); /* cache-line aligned */
68 static struct per_thread_lock
*per_thread_lock
;
70 static volatile int test_go
, test_stop
;
74 static volatile struct test_array test_array
= { 8 };
76 static unsigned long duration
;
79 * returns 0 if test should end.
81 static int test_duration_write(void)
86 static int test_duration_read(void)
91 static unsigned long long __thread nr_writes
;
92 static unsigned long long __thread nr_reads
;
94 static unsigned long long __attribute__((aligned(128))) *tot_nr_writes
;
95 static unsigned long long __attribute__((aligned(128))) *tot_nr_reads
;
97 static unsigned int nr_readers
;
98 static unsigned int nr_writers
;
100 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
102 void rcu_copy_mutex_lock(void)
105 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
107 perror("Error in pthread mutex lock");
112 void rcu_copy_mutex_unlock(void)
116 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
118 perror("Error in pthread mutex unlock");
123 void *thr_reader(void *data
)
125 unsigned long tidx
= (unsigned long)data
;
127 printf("thread_begin %s, thread id : %lx, tid %lu\n",
128 "reader", pthread_self(), (unsigned long)gettid());
135 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
136 assert(test_array
.a
== 8);
137 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
139 if (unlikely(!test_duration_read()))
143 tot_nr_reads
[tidx
] = nr_reads
;
144 printf("thread_end %s, thread id : %lx, tid %lu\n",
145 "reader", pthread_self(), (unsigned long)gettid());
150 void *thr_writer(void *data
)
152 unsigned long wtidx
= (unsigned long)data
;
155 printf("thread_begin %s, thread id : %lx, tid %lu\n",
156 "writer", pthread_self(), (unsigned long)gettid());
164 for (tidx
= 0; tidx
< nr_readers
; tidx
++) {
165 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
169 for (tidx
= nr_readers
- 1; tidx
>= 0; tidx
--) {
170 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
173 if (unlikely(!test_duration_write()))
175 if (unlikely(wdelay
))
179 printf("thread_end %s, thread id : %lx, tid %lu\n",
180 "writer", pthread_self(), (unsigned long)gettid());
181 tot_nr_writes
[wtidx
] = nr_writes
;
185 void show_usage(int argc
, char **argv
)
187 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
189 printf(" [-r] [-w] (yield reader and/or writer)");
191 printf(" [-d delay] (writer period (us))");
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 wdelay
= atoi(argv
[++i
]);
266 printf("running test for %lu seconds, %u readers, %u writers.\n",
267 duration
, nr_readers
, nr_writers
);
268 printf("Writer delay : %u us.\n", wdelay
);
269 printf("thread %-6s, thread id : %lx, tid %lu\n",
270 "main", pthread_self(), (unsigned long)gettid());
273 && sched_setaffinity(0, sizeof(affinity
), &affinity
) < 0) {
274 perror("sched_setaffinity");
278 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
279 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
280 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
281 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
282 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
283 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
284 per_thread_lock
= malloc(sizeof(*per_thread_lock
) * nr_readers
);
286 for (i
= 0; i
< nr_readers
; i
++) {
287 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
292 for (i
= 0; i
< nr_writers
; i
++) {
293 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
307 for (i
= 0; i
< nr_readers
; i
++) {
308 err
= pthread_join(tid_reader
[i
], &tret
);
311 tot_reads
+= tot_nr_reads
[i
];
313 for (i
= 0; i
< nr_writers
; i
++) {
314 err
= pthread_join(tid_writer
[i
], &tret
);
317 tot_writes
+= tot_nr_writes
[i
];
320 printf("total number of reads : %llu, writes %llu\n", tot_reads
,
328 free(per_thread_lock
);