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)
51 #ifndef DYNAMIC_LINK_TEST
54 #define debug_yield_read()
62 struct per_thread_lock
{
64 } __attribute__((aligned(128))); /* cache-line aligned */
66 static struct per_thread_lock
*per_thread_lock
;
68 static volatile int test_go
, test_stop
;
72 static volatile struct test_array test_array
= { 8 };
74 static unsigned long duration
;
77 * returns 0 if test should end.
79 static int test_duration_write(void)
84 static int test_duration_read(void)
89 static unsigned long long __thread nr_writes
;
90 static unsigned long long __thread nr_reads
;
92 static unsigned long long __attribute__((aligned(128))) *tot_nr_writes
;
93 static unsigned long long __attribute__((aligned(128))) *tot_nr_reads
;
95 static unsigned int nr_readers
;
96 static unsigned int nr_writers
;
98 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
100 void rcu_copy_mutex_lock(void)
103 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
105 perror("Error in pthread mutex lock");
110 void rcu_copy_mutex_unlock(void)
114 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
116 perror("Error in pthread mutex unlock");
121 void *thr_reader(void *data
)
123 unsigned long tidx
= (unsigned long)data
;
125 printf("thread_begin %s, thread id : %lx, tid %lu\n",
126 "reader", pthread_self(), (unsigned long)gettid());
133 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
134 assert(test_array
.a
== 8);
135 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
137 if (!test_duration_read())
141 tot_nr_reads
[tidx
] = nr_reads
;
142 printf("thread_end %s, thread id : %lx, tid %lu\n",
143 "reader", pthread_self(), (unsigned long)gettid());
148 void *thr_writer(void *data
)
150 unsigned long wtidx
= (unsigned long)data
;
153 printf("thread_begin %s, thread id : %lx, tid %lu\n",
154 "writer", pthread_self(), (unsigned long)gettid());
162 for (tidx
= 0; tidx
< nr_readers
; tidx
++) {
163 pthread_mutex_lock(&per_thread_lock
[tidx
].lock
);
167 for (tidx
= nr_readers
- 1; tidx
>= 0; tidx
--) {
168 pthread_mutex_unlock(&per_thread_lock
[tidx
].lock
);
171 if (!test_duration_write())
177 printf("thread_end %s, thread id : %lx, tid %lu\n",
178 "writer", pthread_self(), (unsigned long)gettid());
179 tot_nr_writes
[wtidx
] = nr_writes
;
183 void show_usage(int argc
, char **argv
)
185 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
187 printf(" [-r] [-w] (yield reader and/or writer)");
189 printf(" [-d delay] (writer period (us))");
193 int main(int argc
, char **argv
)
196 pthread_t
*tid_reader
, *tid_writer
;
198 unsigned long long *count_reader
, *count_writer
;
199 unsigned long long tot_reads
= 0, tot_writes
= 0;
203 show_usage(argc
, argv
);
208 err
= sscanf(argv
[1], "%u", &nr_readers
);
210 show_usage(argc
, argv
);
214 err
= sscanf(argv
[2], "%u", &nr_writers
);
216 show_usage(argc
, argv
);
220 err
= sscanf(argv
[3], "%lu", &duration
);
222 show_usage(argc
, argv
);
226 for (i
= 4; i
< argc
; i
++) {
227 if (argv
[i
][0] != '-')
229 switch (argv
[i
][1]) {
232 yield_active
|= YIELD_READ
;
235 yield_active
|= YIELD_WRITE
;
240 show_usage(argc
, argv
);
243 wdelay
= atoi(argv
[++i
]);
248 printf("running test for %lu seconds, %u readers, %u writers.\n",
249 duration
, nr_readers
, nr_writers
);
250 printf("Writer delay : %u us.\n", wdelay
);
251 printf("thread %-6s, thread id : %lx, tid %lu\n",
252 "main", pthread_self(), (unsigned long)gettid());
254 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
255 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
256 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
257 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
258 tot_nr_reads
= malloc(sizeof(*tot_nr_reads
) * nr_readers
);
259 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
260 per_thread_lock
= malloc(sizeof(*per_thread_lock
) * nr_readers
);
262 for (i
= 0; i
< nr_readers
; i
++) {
263 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
268 for (i
= 0; i
< nr_writers
; i
++) {
269 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
283 for (i
= 0; i
< nr_readers
; i
++) {
284 err
= pthread_join(tid_reader
[i
], &tret
);
287 tot_reads
+= tot_nr_reads
[i
];
289 for (i
= 0; i
< nr_writers
; i
++) {
290 err
= pthread_join(tid_writer
[i
], &tret
);
293 tot_writes
+= tot_nr_writes
[i
];
296 printf("total number of reads : %llu, writes %llu\n", tot_reads
,
304 free(per_thread_lock
);