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>
35 #if defined(_syscall0)
36 _syscall0(pid_t
, gettid
)
37 #elif defined(__NR_gettid)
38 static inline pid_t
gettid(void)
40 return syscall(__NR_gettid
);
43 #warning "use pid as tid"
44 static inline pid_t
gettid(void)
53 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
55 void rcu_copy_mutex_lock(void)
58 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
60 perror("Error in pthread mutex lock");
65 void rcu_copy_mutex_unlock(void)
69 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
71 perror("Error in pthread mutex unlock");
80 static struct test_array
*test_rcu_pointer
;
82 #define OUTER_READ_LOOP 2000U
83 #define INNER_READ_LOOP 100000U
84 #define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
86 #define OUTER_WRITE_LOOP 10U
87 #define INNER_WRITE_LOOP 200U
88 #define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
93 static cycles_t reader_time
[NR_READ
] __attribute__((aligned(128)));
94 static cycles_t writer_time
[NR_WRITE
] __attribute__((aligned(128)));
96 void *thr_reader(void *arg
)
99 struct test_array
*local_ptr
;
100 cycles_t time1
, time2
;
102 printf("thread_begin %s, thread id : %lx, tid %lu\n",
103 "reader", pthread_self(), (unsigned long)gettid());
106 rcu_register_thread();
108 time1
= get_cycles();
109 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
110 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
112 local_ptr
= rcu_dereference(test_rcu_pointer
);
114 assert(local_ptr
->a
== 8);
119 time2
= get_cycles();
121 rcu_unregister_thread();
123 reader_time
[(unsigned long)arg
] = time2
- time1
;
126 printf("thread_end %s, thread id : %lx, tid %lu\n",
127 "reader", pthread_self(), (unsigned long)gettid());
132 void *thr_writer(void *arg
)
135 struct test_array
*new, *old
;
136 cycles_t time1
, time2
;
138 printf("thread_begin %s, thread id : %lx, tid %lu\n",
139 "writer", pthread_self(), (unsigned long)gettid());
142 for (i
= 0; i
< OUTER_WRITE_LOOP
; i
++) {
143 for (j
= 0; j
< INNER_WRITE_LOOP
; j
++) {
144 time1
= get_cycles();
145 new = malloc(sizeof(struct test_array
));
146 rcu_copy_mutex_lock();
147 old
= test_rcu_pointer
;
152 old
= rcu_publish_content(&test_rcu_pointer
, new);
153 rcu_copy_mutex_unlock();
154 /* can be done after unlock */
159 time2
= get_cycles();
160 writer_time
[(unsigned long)arg
] += time2
- time1
;
165 printf("thread_end %s, thread id : %lx, tid %lu\n",
166 "writer", pthread_self(), (unsigned long)gettid());
173 pthread_t tid_reader
[NR_READ
], tid_writer
[NR_WRITE
];
176 cycles_t tot_rtime
= 0;
177 cycles_t tot_wtime
= 0;
179 printf("thread %-6s, thread id : %lx, tid %lu\n",
180 "main", pthread_self(), (unsigned long)gettid());
182 for (i
= 0; i
< NR_READ
; i
++) {
183 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
188 for (i
= 0; i
< NR_WRITE
; i
++) {
189 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
197 for (i
= 0; i
< NR_READ
; i
++) {
198 err
= pthread_join(tid_reader
[i
], &tret
);
201 tot_rtime
+= reader_time
[i
];
203 for (i
= 0; i
< NR_WRITE
; i
++) {
204 err
= pthread_join(tid_writer
[i
], &tret
);
207 tot_wtime
+= writer_time
[i
];
209 free(test_rcu_pointer
);
210 printf("Time per read : %g cycles\n",
211 (double)tot_rtime
/ ((double)NR_READ
* (double)READ_LOOP
));
212 printf("Time per write : %g cycles\n",
213 (double)tot_wtime
/ ((double)NR_WRITE
* (double)WRITE_LOOP
));