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 WRITE_LOOP 2000U
91 static cycles_t reader_time
[NR_READ
] __attribute__((aligned(128)));
93 void *thr_reader(void *arg
)
96 struct test_array
*local_ptr
;
97 cycles_t time1
, time2
;
99 printf("thread_begin %s, thread id : %lx, tid %lu\n",
100 "reader", pthread_self(), (unsigned long)gettid());
103 rcu_register_thread();
105 time1
= get_cycles();
106 for (i
= 0; i
< OUTER_READ_LOOP
; i
++) {
107 for (j
= 0; j
< INNER_READ_LOOP
; j
++) {
109 local_ptr
= rcu_dereference(test_rcu_pointer
);
111 assert(local_ptr
->a
== 8);
116 time2
= get_cycles();
118 rcu_unregister_thread();
120 reader_time
[(unsigned long)arg
] = time2
- time1
;
123 printf("thread_end %s, thread id : %lx, tid %lu\n",
124 "reader", pthread_self(), (unsigned long)gettid());
129 void *thr_writer(void *arg
)
132 struct test_array
*new, *old
;
134 printf("thread_begin %s, thread id : %lx, tid %lu\n",
135 "writer", pthread_self(), (unsigned long)gettid());
138 for (i
= 0; i
< WRITE_LOOP
; i
++) {
139 new = malloc(sizeof(struct test_array
));
140 rcu_copy_mutex_lock();
141 old
= test_rcu_pointer
;
146 old
= rcu_publish_content(&test_rcu_pointer
, new);
147 rcu_copy_mutex_unlock();
148 /* can be done after unlock */
156 printf("thread_end %s, thread id : %lx, tid %lu\n",
157 "writer", pthread_self(), (unsigned long)gettid());
164 pthread_t tid_reader
[NR_READ
], tid_writer
[NR_WRITE
];
167 cycles_t tot_time
= 0;
169 printf("thread %-6s, thread id : %lx, tid %lu\n",
170 "main", pthread_self(), (unsigned long)gettid());
172 for (i
= 0; i
< NR_READ
; i
++) {
173 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
178 for (i
= 0; i
< NR_WRITE
; i
++) {
179 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
, NULL
);
186 for (i
= 0; i
< NR_READ
; i
++) {
187 err
= pthread_join(tid_reader
[i
], &tret
);
190 tot_time
+= reader_time
[i
];
192 for (i
= 0; i
< NR_WRITE
; i
++) {
193 err
= pthread_join(tid_writer
[i
], &tret
);
197 free(test_rcu_pointer
);
198 printf("Time per read : %g cycles\n",
199 (double)tot_time
/ ((double)NR_READ
* (double)READ_LOOP
));