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.
24 #include "../config.h"
29 #include <sys/types.h>
36 #include <urcu/arch.h>
37 #include <urcu/tls-compat.h>
44 /* hardcoded number of CPUs */
47 #if defined(_syscall0)
48 _syscall0(pid_t
, gettid
)
49 #elif defined(__NR_gettid)
50 static inline pid_t
gettid(void)
52 return syscall(__NR_gettid
);
55 #warning "use pid as tid"
56 static inline pid_t
gettid(void)
62 #ifndef DYNAMIC_LINK_TEST
65 #define rcu_debug_yield_read()
69 static volatile int test_go
, test_stop
;
71 static unsigned long wdelay
;
73 static int *test_rcu_pointer
;
75 static unsigned long duration
;
77 /* read-side C.S. duration, in loops */
78 static unsigned long rduration
;
80 /* write-side C.S. duration, in loops */
81 static unsigned long wduration
;
83 static inline void loop_sleep(unsigned long loops
)
89 static int verbose_mode
;
91 #define printf_verbose(fmt, args...) \
97 static unsigned int cpu_affinities
[NR_CPUS
];
98 static unsigned int next_aff
= 0;
99 static int use_affinity
= 0;
101 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
103 static void set_affinity(void)
105 #if HAVE_SCHED_SETAFFINITY
108 #endif /* HAVE_SCHED_SETAFFINITY */
113 #if HAVE_SCHED_SETAFFINITY
114 ret
= pthread_mutex_lock(&affinity_mutex
);
116 perror("Error in pthread mutex lock");
119 cpu
= cpu_affinities
[next_aff
++];
120 ret
= pthread_mutex_unlock(&affinity_mutex
);
122 perror("Error in pthread mutex unlock");
128 #if SCHED_SETAFFINITY_ARGS == 2
129 sched_setaffinity(0, &mask
);
131 sched_setaffinity(0, sizeof(mask
), &mask
);
133 #endif /* HAVE_SCHED_SETAFFINITY */
137 * returns 0 if test should end.
139 static int test_duration_write(void)
144 static int test_duration_read(void)
149 static DEFINE_URCU_TLS(unsigned long long, nr_writes
);
150 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
152 static unsigned int nr_readers
;
153 static unsigned int nr_writers
;
155 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
157 void rcu_copy_mutex_lock(void)
160 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
162 perror("Error in pthread mutex lock");
167 void rcu_copy_mutex_unlock(void)
171 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
173 perror("Error in pthread mutex unlock");
178 void *thr_reader(void *_count
)
180 unsigned long long *count
= _count
;
183 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
184 "reader", (unsigned long) pthread_self(),
185 (unsigned long) gettid());
189 rcu_register_thread();
190 assert(!rcu_read_ongoing());
199 assert(rcu_read_ongoing());
200 local_ptr
= rcu_dereference(test_rcu_pointer
);
201 rcu_debug_yield_read();
203 assert(*local_ptr
== 8);
204 if (caa_unlikely(rduration
))
205 loop_sleep(rduration
);
207 URCU_TLS(nr_reads
)++;
208 if (caa_unlikely(!test_duration_read()))
212 rcu_unregister_thread();
214 /* test extra thread registration */
215 rcu_register_thread();
216 rcu_unregister_thread();
218 *count
= URCU_TLS(nr_reads
);
219 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
220 "reader", (unsigned long) pthread_self(),
221 (unsigned long) gettid());
226 void *thr_writer(void *_count
)
228 unsigned long long *count
= _count
;
231 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
232 "writer", (unsigned long) pthread_self(),
233 (unsigned long) gettid());
243 new = malloc(sizeof(int));
246 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
247 if (caa_unlikely(wduration
))
248 loop_sleep(wduration
);
253 URCU_TLS(nr_writes
)++;
254 if (caa_unlikely(!test_duration_write()))
256 if (caa_unlikely(wdelay
))
260 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
261 "writer", (unsigned long) pthread_self(),
262 (unsigned long) gettid());
263 *count
= URCU_TLS(nr_writes
);
267 void show_usage(int argc
, char **argv
)
269 printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
271 printf("OPTIONS:\n");
273 printf(" [-r] [-w] (yield reader and/or writer)\n");
275 printf(" [-d delay] (writer period (us))\n");
276 printf(" [-c duration] (reader C.S. duration (in loops))\n");
277 printf(" [-e duration] (writer C.S. duration (in loops))\n");
278 printf(" [-v] (verbose output)\n");
279 printf(" [-a cpu#] [-a cpu#]... (affinity)\n");
283 int main(int argc
, char **argv
)
286 pthread_t
*tid_reader
, *tid_writer
;
288 unsigned long long *count_reader
, *count_writer
;
289 unsigned long long tot_reads
= 0, tot_writes
= 0;
293 show_usage(argc
, argv
);
297 err
= sscanf(argv
[1], "%u", &nr_readers
);
299 show_usage(argc
, argv
);
303 err
= sscanf(argv
[2], "%u", &nr_writers
);
305 show_usage(argc
, argv
);
309 err
= sscanf(argv
[3], "%lu", &duration
);
311 show_usage(argc
, argv
);
315 for (i
= 4; i
< argc
; i
++) {
316 if (argv
[i
][0] != '-')
318 switch (argv
[i
][1]) {
321 rcu_yield_active
|= RCU_YIELD_READ
;
324 rcu_yield_active
|= RCU_YIELD_WRITE
;
329 show_usage(argc
, argv
);
333 cpu_affinities
[next_aff
++] = a
;
335 printf_verbose("Adding CPU %d affinity\n", a
);
339 show_usage(argc
, argv
);
342 rduration
= atol(argv
[++i
]);
346 show_usage(argc
, argv
);
349 wdelay
= atol(argv
[++i
]);
353 show_usage(argc
, argv
);
356 wduration
= atol(argv
[++i
]);
364 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
365 duration
, nr_readers
, nr_writers
);
366 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
367 printf_verbose("Reader duration : %lu loops.\n", rduration
);
368 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
369 "main", (unsigned long) pthread_self(),
370 (unsigned long)gettid());
372 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
373 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
374 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
375 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
379 for (i
= 0; i
< nr_readers
; i
++) {
380 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
385 for (i
= 0; i
< nr_writers
; i
++) {
386 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
400 for (i
= 0; i
< nr_readers
; i
++) {
401 err
= pthread_join(tid_reader
[i
], &tret
);
404 tot_reads
+= count_reader
[i
];
406 for (i
= 0; i
< nr_writers
; i
++) {
407 err
= pthread_join(tid_writer
[i
], &tret
);
410 tot_writes
+= count_writer
[i
];
413 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
415 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
417 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
418 argv
[0], duration
, nr_readers
, rduration
, wduration
,
419 nr_writers
, wdelay
, tot_reads
, tot_writes
,
420 tot_reads
+ tot_writes
);
421 free(test_rcu_pointer
);