4 * Userspace RCU library - test program (with automatic reclamation)
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>
36 #include <urcu/arch.h>
38 /* hardcoded number of CPUs */
41 #if defined(_syscall0)
42 _syscall0(pid_t
, gettid
)
43 #elif defined(__NR_gettid)
44 static inline pid_t
gettid(void)
46 return syscall(__NR_gettid
);
49 #warning "use pid as tid"
50 static inline pid_t
gettid(void)
56 #ifndef DYNAMIC_LINK_TEST
59 #define debug_yield_read()
62 #include <urcu-defer.h>
68 static volatile int test_go
, test_stop
;
70 static unsigned long wdelay
;
72 static struct test_array
*test_rcu_pointer
;
74 static unsigned long duration
;
76 /* read-side C.S. duration, in loops */
77 static unsigned long rduration
;
79 static inline void loop_sleep(unsigned long l
)
85 static int verbose_mode
;
87 #define printf_verbose(fmt, args...) \
93 static unsigned int cpu_affinities
[NR_CPUS
];
94 static unsigned int next_aff
= 0;
95 static int use_affinity
= 0;
97 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
99 static void set_affinity(void)
108 ret
= pthread_mutex_lock(&affinity_mutex
);
110 perror("Error in pthread mutex lock");
113 cpu
= cpu_affinities
[next_aff
++];
114 ret
= pthread_mutex_unlock(&affinity_mutex
);
116 perror("Error in pthread mutex unlock");
121 sched_setaffinity(0, sizeof(mask
), &mask
);
125 * returns 0 if test should end.
127 static int test_duration_write(void)
132 static int test_duration_read(void)
137 static unsigned long long __thread nr_writes
;
138 static unsigned long long __thread nr_reads
;
141 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
143 static unsigned int nr_readers
;
144 static unsigned int nr_writers
;
146 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
148 void rcu_copy_mutex_lock(void)
151 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
153 perror("Error in pthread mutex lock");
158 void rcu_copy_mutex_unlock(void)
162 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
164 perror("Error in pthread mutex unlock");
169 void *thr_reader(void *_count
)
171 unsigned long long *count
= _count
;
172 struct test_array
*local_ptr
;
174 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
175 "reader", pthread_self(), (unsigned long)gettid());
179 rcu_register_thread();
188 local_ptr
= rcu_dereference(test_rcu_pointer
);
191 assert(local_ptr
->a
== 8);
192 if (unlikely(rduration
))
193 loop_sleep(rduration
);
196 if (unlikely(!test_duration_read()))
200 rcu_unregister_thread();
203 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
204 "reader", pthread_self(), (unsigned long)gettid());
209 static void test_cb2(void *data
)
213 static void test_cb1(void *data
)
217 void *thr_writer(void *data
)
219 unsigned long wtidx
= (unsigned long)data
;
220 struct test_array
*new, *old
= NULL
;
222 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
223 "writer", pthread_self(), (unsigned long)gettid());
227 rcu_defer_register_thread();
235 new = malloc(sizeof(*new));
237 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
239 call_rcu(test_cb1
, old
);
240 call_rcu(test_cb1
, (void *)-2L);
241 call_rcu(test_cb1
, (void *)-2L);
242 call_rcu(test_cb1
, old
);
243 call_rcu(test_cb2
, (void *)-2L);
244 call_rcu(test_cb2
, (void *)-4L);
245 call_rcu(test_cb2
, (void *)-2L);
247 if (unlikely(!test_duration_write()))
249 if (unlikely(wdelay
))
253 rcu_defer_unregister_thread();
255 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
256 "writer", pthread_self(), (unsigned long)gettid());
257 tot_nr_writes
[wtidx
] = nr_writes
;
261 void show_usage(int argc
, char **argv
)
263 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
265 printf(" [-r] [-w] (yield reader and/or writer)");
267 printf(" [-d delay] (writer period (us))");
268 printf(" [-c duration] (reader C.S. duration (in loops))");
269 printf(" [-v] (verbose output)");
270 printf(" [-a cpu#] [-a cpu#]... (affinity)");
274 int main(int argc
, char **argv
)
277 pthread_t
*tid_reader
, *tid_writer
;
279 unsigned long long *count_reader
;
280 unsigned long long tot_reads
= 0, tot_writes
= 0;
284 show_usage(argc
, argv
);
288 err
= sscanf(argv
[1], "%u", &nr_readers
);
290 show_usage(argc
, argv
);
294 err
= sscanf(argv
[2], "%u", &nr_writers
);
296 show_usage(argc
, argv
);
300 err
= sscanf(argv
[3], "%lu", &duration
);
302 show_usage(argc
, argv
);
306 for (i
= 4; i
< argc
; i
++) {
307 if (argv
[i
][0] != '-')
309 switch (argv
[i
][1]) {
312 yield_active
|= YIELD_READ
;
315 yield_active
|= YIELD_WRITE
;
320 show_usage(argc
, argv
);
324 cpu_affinities
[next_aff
++] = a
;
326 printf_verbose("Adding CPU %d affinity\n", a
);
330 show_usage(argc
, argv
);
333 rduration
= atol(argv
[++i
]);
337 show_usage(argc
, argv
);
340 wdelay
= atol(argv
[++i
]);
348 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
349 duration
, nr_readers
, nr_writers
);
350 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
351 printf_verbose("Reader duration : %lu loops.\n", rduration
);
352 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
353 "main", pthread_self(), (unsigned long)gettid());
355 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
356 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
357 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
358 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
362 for (i
= 0; i
< nr_readers
; i
++) {
363 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
368 for (i
= 0; i
< nr_writers
; i
++) {
369 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
383 for (i
= 0; i
< nr_readers
; i
++) {
384 err
= pthread_join(tid_reader
[i
], &tret
);
387 tot_reads
+= count_reader
[i
];
389 for (i
= 0; i
< nr_writers
; i
++) {
390 err
= pthread_join(tid_writer
[i
], &tret
);
393 tot_writes
+= tot_nr_writes
[i
];
396 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
398 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
400 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
401 argv
[0], duration
, nr_readers
, rduration
,
402 nr_writers
, wdelay
, tot_reads
, tot_writes
,
403 tot_reads
+ tot_writes
);