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>
37 #include <urcu/arch.h>
39 /* hardcoded number of CPUs */
42 #if defined(_syscall0)
43 _syscall0(pid_t
, gettid
)
44 #elif defined(__NR_gettid)
45 static inline pid_t
gettid(void)
47 return syscall(__NR_gettid
);
50 #warning "use pid as tid"
51 static inline pid_t
gettid(void)
57 #ifndef DYNAMIC_LINK_TEST
60 #define debug_yield_read()
68 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
70 static volatile int test_go
, test_stop
;
72 static unsigned long wdelay
;
74 static volatile struct test_array test_array
= { 8 };
76 static unsigned long duration
;
78 /* read-side C.S. duration, in loops */
79 static unsigned long rduration
;
81 static inline void loop_sleep(unsigned long l
)
87 static int verbose_mode
;
89 #define printf_verbose(fmt, args...) \
95 static unsigned int cpu_affinities
[NR_CPUS
];
96 static unsigned int next_aff
= 0;
97 static int use_affinity
= 0;
99 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
101 static void set_affinity(void)
110 ret
= pthread_mutex_lock(&affinity_mutex
);
112 perror("Error in pthread mutex lock");
115 cpu
= cpu_affinities
[next_aff
++];
116 ret
= pthread_mutex_unlock(&affinity_mutex
);
118 perror("Error in pthread mutex unlock");
123 sched_setaffinity(0, sizeof(mask
), &mask
);
127 * returns 0 if test should end.
129 static int test_duration_write(void)
134 static int test_duration_read(void)
139 static unsigned long long __thread nr_writes
;
140 static unsigned long long __thread nr_reads
;
142 static unsigned int nr_readers
;
143 static unsigned int nr_writers
;
145 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
147 void rcu_copy_mutex_lock(void)
150 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
152 perror("Error in pthread mutex lock");
157 void rcu_copy_mutex_unlock(void)
161 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
163 perror("Error in pthread mutex unlock");
168 void *thr_reader(void *_count
)
170 unsigned long long *count
= _count
;
172 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
173 "reader", pthread_self(), (unsigned long)gettid());
182 pthread_rwlock_rdlock(&lock
);
183 assert(test_array
.a
== 8);
184 if (unlikely(rduration
))
185 loop_sleep(rduration
);
186 pthread_rwlock_unlock(&lock
);
188 if (unlikely(!test_duration_read()))
193 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
194 "reader", pthread_self(), (unsigned long)gettid());
199 void *thr_writer(void *_count
)
201 unsigned long long *count
= _count
;
203 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
204 "writer", pthread_self(), (unsigned long)gettid());
214 pthread_rwlock_wrlock(&lock
);
217 pthread_rwlock_unlock(&lock
);
219 if (unlikely(!test_duration_write()))
221 if (unlikely(wdelay
))
225 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
226 "writer", pthread_self(), (unsigned long)gettid());
231 void show_usage(int argc
, char **argv
)
233 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
235 printf(" [-r] [-w] (yield reader and/or writer)");
237 printf(" [-d delay] (writer period (us))");
238 printf(" [-c duration] (reader C.S. duration (in loops))");
239 printf(" [-v] (verbose output)");
240 printf(" [-a cpu#] [-a cpu#]... (affinity)");
244 int main(int argc
, char **argv
)
247 pthread_t
*tid_reader
, *tid_writer
;
249 unsigned long long *count_reader
, *count_writer
;
250 unsigned long long tot_reads
= 0, tot_writes
= 0;
254 show_usage(argc
, argv
);
259 err
= sscanf(argv
[1], "%u", &nr_readers
);
261 show_usage(argc
, argv
);
265 err
= sscanf(argv
[2], "%u", &nr_writers
);
267 show_usage(argc
, argv
);
271 err
= sscanf(argv
[3], "%lu", &duration
);
273 show_usage(argc
, argv
);
277 for (i
= 4; i
< argc
; i
++) {
278 if (argv
[i
][0] != '-')
280 switch (argv
[i
][1]) {
283 yield_active
|= YIELD_READ
;
286 yield_active
|= YIELD_WRITE
;
291 show_usage(argc
, argv
);
295 cpu_affinities
[next_aff
++] = a
;
297 printf_verbose("Adding CPU %d affinity\n", a
);
301 show_usage(argc
, argv
);
304 rduration
= atol(argv
[++i
]);
308 show_usage(argc
, argv
);
311 wdelay
= atol(argv
[++i
]);
319 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
320 duration
, nr_readers
, nr_writers
);
321 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
322 printf_verbose("Reader duration : %lu loops.\n", rduration
);
323 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
324 "main", pthread_self(), (unsigned long)gettid());
326 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
327 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
328 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
329 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
333 for (i
= 0; i
< nr_readers
; i
++) {
334 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
339 for (i
= 0; i
< nr_writers
; i
++) {
340 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
354 for (i
= 0; i
< nr_readers
; i
++) {
355 err
= pthread_join(tid_reader
[i
], &tret
);
358 tot_reads
+= count_reader
[i
];
360 for (i
= 0; i
< nr_writers
; i
++) {
361 err
= pthread_join(tid_writer
[i
], &tret
);
364 tot_writes
+= count_writer
[i
];
367 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
369 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
371 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
372 argv
[0], duration
, nr_readers
, rduration
,
373 nr_writers
, wdelay
, tot_reads
, tot_writes
,
374 tot_reads
+ tot_writes
);