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 /* Make this big enough to include the POWER5+ L3 cacheline size of 256B */
39 #define CACHE_LINE_SIZE 4096
41 /* hardcoded number of CPUs */
44 #if defined(_syscall0)
45 _syscall0(pid_t
, gettid
)
46 #elif defined(__NR_gettid)
47 static inline pid_t
gettid(void)
49 return syscall(__NR_gettid
);
52 #warning "use pid as tid"
53 static inline pid_t
gettid(void)
59 #ifndef DYNAMIC_LINK_TEST
62 #define debug_yield_read()
65 #include <urcu-defer.h>
71 static volatile int test_go
, test_stop
;
73 static unsigned long wdelay
;
75 static struct test_array
*test_rcu_pointer
;
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 static void set_affinity(void)
111 ret
= pthread_mutex_lock(&affinity_mutex
);
113 perror("Error in pthread mutex lock");
116 cpu
= cpu_affinities
[next_aff
++];
117 ret
= pthread_mutex_unlock(&affinity_mutex
);
119 perror("Error in pthread mutex unlock");
124 sched_setaffinity(0, sizeof(mask
), &mask
);
128 * returns 0 if test should end.
130 static int test_duration_write(void)
135 static int test_duration_read(void)
140 static unsigned long long __thread nr_writes
;
141 static unsigned long long __thread nr_reads
;
144 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
146 static unsigned int nr_readers
;
147 static unsigned int nr_writers
;
149 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
151 void rcu_copy_mutex_lock(void)
154 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
156 perror("Error in pthread mutex lock");
161 void rcu_copy_mutex_unlock(void)
165 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
167 perror("Error in pthread mutex unlock");
172 void *thr_reader(void *_count
)
174 unsigned long long *count
= _count
;
175 struct test_array
*local_ptr
;
177 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
178 "reader", pthread_self(), (unsigned long)gettid());
182 rcu_register_thread();
191 local_ptr
= rcu_dereference(test_rcu_pointer
);
194 assert(local_ptr
->a
== 8);
195 if (unlikely(rduration
))
196 loop_sleep(rduration
);
199 if (unlikely(!test_duration_read()))
203 rcu_unregister_thread();
206 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
207 "reader", pthread_self(), (unsigned long)gettid());
212 static void test_cb2(void *data
)
216 static void test_cb1(void *data
)
220 void *thr_writer(void *data
)
222 unsigned long wtidx
= (unsigned long)data
;
223 struct test_array
*new, *old
= NULL
;
225 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
226 "writer", pthread_self(), (unsigned long)gettid());
230 rcu_defer_register_thread();
238 new = malloc(sizeof(*new));
240 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
242 call_rcu(test_cb1
, old
);
243 call_rcu(test_cb1
, (void *)-2L);
244 call_rcu(test_cb1
, (void *)-2L);
245 call_rcu(test_cb1
, old
);
246 call_rcu(test_cb2
, (void *)-2L);
247 call_rcu(test_cb2
, (void *)-4L);
248 call_rcu(test_cb2
, (void *)-2L);
250 if (unlikely(!test_duration_write()))
252 if (unlikely(wdelay
))
256 rcu_defer_unregister_thread();
258 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
259 "writer", pthread_self(), (unsigned long)gettid());
260 tot_nr_writes
[wtidx
] = nr_writes
;
264 void show_usage(int argc
, char **argv
)
266 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
268 printf(" [-r] [-w] (yield reader and/or writer)");
270 printf(" [-d delay] (writer period (us))");
271 printf(" [-c duration] (reader C.S. duration (in loops))");
272 printf(" [-v] (verbose output)");
273 printf(" [-a cpu#] [-a cpu#]... (affinity)");
277 int main(int argc
, char **argv
)
280 pthread_t
*tid_reader
, *tid_writer
;
282 unsigned long long *count_reader
;
283 unsigned long long tot_reads
= 0, tot_writes
= 0;
287 show_usage(argc
, argv
);
291 err
= sscanf(argv
[1], "%u", &nr_readers
);
293 show_usage(argc
, argv
);
297 err
= sscanf(argv
[2], "%u", &nr_writers
);
299 show_usage(argc
, argv
);
303 err
= sscanf(argv
[3], "%lu", &duration
);
305 show_usage(argc
, argv
);
309 for (i
= 4; i
< argc
; i
++) {
310 if (argv
[i
][0] != '-')
312 switch (argv
[i
][1]) {
315 yield_active
|= YIELD_READ
;
318 yield_active
|= YIELD_WRITE
;
323 show_usage(argc
, argv
);
327 cpu_affinities
[next_aff
++] = a
;
329 printf_verbose("Adding CPU %d affinity\n", a
);
333 show_usage(argc
, argv
);
336 rduration
= atol(argv
[++i
]);
340 show_usage(argc
, argv
);
343 wdelay
= atol(argv
[++i
]);
351 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
352 duration
, nr_readers
, nr_writers
);
353 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
354 printf_verbose("Reader duration : %lu loops.\n", rduration
);
355 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
356 "main", pthread_self(), (unsigned long)gettid());
358 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
359 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
360 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
361 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
365 for (i
= 0; i
< nr_readers
; i
++) {
366 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
371 for (i
= 0; i
< nr_writers
; i
++) {
372 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
386 for (i
= 0; i
< nr_readers
; i
++) {
387 err
= pthread_join(tid_reader
[i
], &tret
);
390 tot_reads
+= count_reader
[i
];
392 for (i
= 0; i
< nr_writers
; i
++) {
393 err
= pthread_join(tid_writer
[i
], &tret
);
396 tot_writes
+= tot_nr_writes
[i
];
399 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
401 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
403 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
404 argv
[0], duration
, nr_readers
, rduration
,
405 nr_writers
, wdelay
, tot_reads
, tot_writes
,
406 tot_reads
+ tot_writes
);