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.
24 #include "../config.h"
29 #include <sys/types.h>
34 #include <sys/syscall.h>
38 #include <urcu/arch.h>
40 /* hardcoded number of CPUs */
43 #if defined(_syscall0)
44 _syscall0(pid_t
, gettid
)
45 #elif defined(__NR_gettid)
46 static inline pid_t
gettid(void)
48 return syscall(__NR_gettid
);
51 #warning "use pid as tid"
52 static inline pid_t
gettid(void)
58 #ifndef DYNAMIC_LINK_TEST
61 #define debug_yield_read()
69 pthread_rwlock_t lock
= PTHREAD_RWLOCK_INITIALIZER
;
71 static volatile int test_go
, test_stop
;
73 static unsigned long wdelay
;
75 static volatile struct test_array test_array
= { 8 };
77 static unsigned long duration
;
79 /* read-side C.S. duration, in loops */
80 static unsigned long rduration
;
82 static inline void loop_sleep(unsigned long l
)
88 static int verbose_mode
;
90 #define printf_verbose(fmt, args...) \
96 static unsigned int cpu_affinities
[NR_CPUS
];
97 static unsigned int next_aff
= 0;
98 static int use_affinity
= 0;
100 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
102 #ifndef HAVE_CPU_SET_T
103 typedef unsigned long cpu_set_t
;
104 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
105 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
108 static void set_affinity(void)
117 #if HAVE_SCHED_SETAFFINITY
118 ret
= pthread_mutex_lock(&affinity_mutex
);
120 perror("Error in pthread mutex lock");
123 cpu
= cpu_affinities
[next_aff
++];
124 ret
= pthread_mutex_unlock(&affinity_mutex
);
126 perror("Error in pthread mutex unlock");
132 #if SCHED_SETAFFINITY_ARGS == 2
133 sched_setaffinity(0, &mask
);
135 sched_setaffinity(0, sizeof(mask
), &mask
);
137 #endif /* HAVE_SCHED_SETAFFINITY */
141 * returns 0 if test should end.
143 static int test_duration_write(void)
148 static int test_duration_read(void)
153 static unsigned long long __thread nr_writes
;
154 static unsigned long long __thread nr_reads
;
156 static unsigned int nr_readers
;
157 static unsigned int nr_writers
;
159 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
161 void rcu_copy_mutex_lock(void)
164 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
166 perror("Error in pthread mutex lock");
171 void rcu_copy_mutex_unlock(void)
175 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
177 perror("Error in pthread mutex unlock");
182 void *thr_reader(void *_count
)
184 unsigned long long *count
= _count
;
186 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
187 "reader", pthread_self(), (unsigned long)gettid());
196 pthread_rwlock_rdlock(&lock
);
197 assert(test_array
.a
== 8);
198 if (unlikely(rduration
))
199 loop_sleep(rduration
);
200 pthread_rwlock_unlock(&lock
);
202 if (unlikely(!test_duration_read()))
207 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
208 "reader", pthread_self(), (unsigned long)gettid());
213 void *thr_writer(void *_count
)
215 unsigned long long *count
= _count
;
217 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
218 "writer", pthread_self(), (unsigned long)gettid());
228 pthread_rwlock_wrlock(&lock
);
231 pthread_rwlock_unlock(&lock
);
233 if (unlikely(!test_duration_write()))
235 if (unlikely(wdelay
))
239 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
240 "writer", pthread_self(), (unsigned long)gettid());
245 void show_usage(int argc
, char **argv
)
247 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
249 printf(" [-r] [-w] (yield reader and/or writer)");
251 printf(" [-d delay] (writer period (us))");
252 printf(" [-c duration] (reader C.S. duration (in loops))");
253 printf(" [-v] (verbose output)");
254 printf(" [-a cpu#] [-a cpu#]... (affinity)");
258 int main(int argc
, char **argv
)
261 pthread_t
*tid_reader
, *tid_writer
;
263 unsigned long long *count_reader
, *count_writer
;
264 unsigned long long tot_reads
= 0, tot_writes
= 0;
268 show_usage(argc
, argv
);
273 err
= sscanf(argv
[1], "%u", &nr_readers
);
275 show_usage(argc
, argv
);
279 err
= sscanf(argv
[2], "%u", &nr_writers
);
281 show_usage(argc
, argv
);
285 err
= sscanf(argv
[3], "%lu", &duration
);
287 show_usage(argc
, argv
);
291 for (i
= 4; i
< argc
; i
++) {
292 if (argv
[i
][0] != '-')
294 switch (argv
[i
][1]) {
297 yield_active
|= YIELD_READ
;
300 yield_active
|= YIELD_WRITE
;
305 show_usage(argc
, argv
);
309 cpu_affinities
[next_aff
++] = a
;
311 printf_verbose("Adding CPU %d affinity\n", a
);
315 show_usage(argc
, argv
);
318 rduration
= atol(argv
[++i
]);
322 show_usage(argc
, argv
);
325 wdelay
= atol(argv
[++i
]);
333 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
334 duration
, nr_readers
, nr_writers
);
335 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
336 printf_verbose("Reader duration : %lu loops.\n", rduration
);
337 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
338 "main", pthread_self(), (unsigned long)gettid());
340 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
341 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
342 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
343 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
347 for (i
= 0; i
< nr_readers
; i
++) {
348 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
353 for (i
= 0; i
< nr_writers
; i
++) {
354 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
368 for (i
= 0; i
< nr_readers
; i
++) {
369 err
= pthread_join(tid_reader
[i
], &tret
);
372 tot_reads
+= count_reader
[i
];
374 for (i
= 0; i
< nr_writers
; i
++) {
375 err
= pthread_join(tid_writer
[i
], &tret
);
378 tot_writes
+= count_writer
[i
];
381 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
383 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
385 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
386 argv
[0], duration
, nr_readers
, rduration
,
387 nr_writers
, wdelay
, tot_reads
, tot_writes
,
388 tot_reads
+ tot_writes
);