4 * Userspace RCU library - test program
6 * Copyright February 2009 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
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>
33 #include <urcu/arch.h>
39 #if defined(_syscall0)
40 _syscall0(pid_t
, gettid
)
41 #elif defined(__NR_gettid)
42 static inline pid_t
gettid(void)
44 return syscall(__NR_gettid
);
47 #warning "use pid as tid"
48 static inline pid_t
gettid(void)
57 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
59 void rcu_copy_mutex_lock(void)
62 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
64 perror("Error in pthread mutex lock");
69 void rcu_copy_mutex_unlock(void)
73 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
75 perror("Error in pthread mutex unlock");
84 static struct test_array
*test_rcu_pointer
;
86 #define OUTER_READ_LOOP 2000U
87 #define INNER_READ_LOOP 100000U
88 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
90 #define OUTER_WRITE_LOOP 10U
91 #define INNER_WRITE_LOOP 200U
92 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
97 #define NR_READ num_read
98 #define NR_WRITE num_write
100 static cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *reader_time
;
101 static cycles_t
__attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *writer_time
;
103 void *thr_reader(void *arg
)
106 struct test_array
*local_ptr
;
107 cycles_t time1
, time2
;
109 printf("thread_begin %s, thread id : %lx, tid %lu\n",
110 "reader", pthread_self(), (unsigned long)gettid());
113 rcu_register_thread();
115 time1
= caa_get_cycles();
116 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
117 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
119 local_ptr
= rcu_dereference(test_rcu_pointer
);
121 assert(local_ptr
->a
== 8);
126 time2
= caa_get_cycles();
128 rcu_unregister_thread();
130 reader_time
[(unsigned long)arg
] = time2
- time1
;
133 printf("thread_end %s, thread id : %lx, tid %lu\n",
134 "reader", pthread_self(), (unsigned long)gettid());
139 void *thr_writer(void *arg
)
142 struct test_array
*new, *old
;
143 cycles_t time1
, time2
;
145 printf("thread_begin %s, thread id : %lx, tid %lu\n",
146 "writer", pthread_self(), (unsigned long)gettid());
149 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
150 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
151 time1
= caa_get_cycles();
152 new = malloc(sizeof(struct test_array
));
153 rcu_copy_mutex_lock();
154 old
= test_rcu_pointer
;
159 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
160 rcu_copy_mutex_unlock();
162 /* can be done after unlock */
167 time2
= caa_get_cycles();
168 writer_time
[(unsigned long)arg
] += time2
- time1
;
173 printf("thread_end %s, thread id : %lx, tid %lu\n",
174 "writer", pthread_self(), (unsigned long)gettid());
178 int main(int argc
, char **argv
)
181 pthread_t
*tid_reader
, *tid_writer
;
184 cycles_t tot_rtime
= 0;
185 cycles_t tot_wtime
= 0;
188 printf("Usage : %s nr_readers nr_writers\n", argv
[0]);
191 num_read
= atoi(argv
[1]);
192 num_write
= atoi(argv
[2]);
194 reader_time
= malloc(sizeof(*reader_time
) * num_read
);
195 writer_time
= malloc(sizeof(*writer_time
) * num_write
);
196 tid_reader
= malloc(sizeof(*tid_reader
) * num_read
);
197 tid_writer
= malloc(sizeof(*tid_writer
) * num_write
);
199 printf("thread %-6s, thread id : %lx, tid %lu\n",
200 "main", pthread_self(), (unsigned long)gettid());
202 for (i
= 0; i
< NR_READ
; i
++) {
203 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
208 for (i
= 0; i
< NR_WRITE
; i
++) {
209 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
217 for (i
= 0; i
< NR_READ
; i
++) {
218 err
= pthread_join(tid_reader
[i
], &tret
);
221 tot_rtime
+= reader_time
[i
];
223 for (i
= 0; i
< NR_WRITE
; i
++) {
224 err
= pthread_join(tid_writer
[i
], &tret
);
227 tot_wtime
+= writer_time
[i
];
229 free(test_rcu_pointer
);
230 printf("Time per read : %g cycles\n",
231 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
232 printf("Time per write : %g cycles\n",
233 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));