4 * Userspace RCU library - test program (with automatic reclamation)
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>
37 #include <urcu/arch.h>
43 /* hardcoded number of CPUs */
46 #if defined(_syscall0)
47 _syscall0(pid_t
, gettid
)
48 #elif defined(__NR_gettid)
49 static inline pid_t
gettid(void)
51 return syscall(__NR_gettid
);
54 #warning "use pid as tid"
55 static inline pid_t
gettid(void)
61 #ifndef DYNAMIC_LINK_TEST
64 #define debug_yield_read()
67 #include <urcu-defer.h>
73 static volatile int test_go
, test_stop
;
75 static unsigned long wdelay
;
77 static struct test_array
*test_rcu_pointer
;
79 static unsigned long duration
;
81 /* read-side C.S. duration, in loops */
82 static unsigned long rduration
;
84 /* write-side C.S. duration, in loops */
85 static unsigned long wduration
;
87 static inline void loop_sleep(unsigned long l
)
93 static int verbose_mode
;
95 #define printf_verbose(fmt, args...) \
101 static unsigned int cpu_affinities
[NR_CPUS
];
102 static unsigned int next_aff
= 0;
103 static int use_affinity
= 0;
105 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
107 #ifndef HAVE_CPU_SET_T
108 typedef unsigned long cpu_set_t
;
109 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
110 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
113 static void set_affinity(void)
122 #if HAVE_SCHED_SETAFFINITY
123 ret
= pthread_mutex_lock(&affinity_mutex
);
125 perror("Error in pthread mutex lock");
128 cpu
= cpu_affinities
[next_aff
++];
129 ret
= pthread_mutex_unlock(&affinity_mutex
);
131 perror("Error in pthread mutex unlock");
137 #if SCHED_SETAFFINITY_ARGS == 2
138 sched_setaffinity(0, &mask
);
140 sched_setaffinity(0, sizeof(mask
), &mask
);
142 #endif /* HAVE_SCHED_SETAFFINITY */
146 * returns 0 if test should end.
148 static int test_duration_write(void)
153 static int test_duration_read(void)
158 static unsigned long long __thread nr_writes
;
159 static unsigned long long __thread nr_reads
;
162 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
164 static unsigned int nr_readers
;
165 static unsigned int nr_writers
;
167 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
169 void rcu_copy_mutex_lock(void)
172 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
174 perror("Error in pthread mutex lock");
179 void rcu_copy_mutex_unlock(void)
183 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
185 perror("Error in pthread mutex unlock");
190 void *thr_reader(void *_count
)
192 unsigned long long *count
= _count
;
193 struct test_array
*local_ptr
;
195 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
196 "reader", pthread_self(), (unsigned long)gettid());
200 rcu_register_thread();
209 local_ptr
= rcu_dereference(test_rcu_pointer
);
212 assert(local_ptr
->a
== 8);
213 if (unlikely(rduration
))
214 loop_sleep(rduration
);
217 if (unlikely(!test_duration_read()))
221 rcu_unregister_thread();
224 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
225 "reader", pthread_self(), (unsigned long)gettid());
230 static void test_cb2(void *data
)
234 static void test_cb1(void *data
)
238 void *thr_writer(void *data
)
240 unsigned long wtidx
= (unsigned long)data
;
241 struct test_array
*new, *old
= NULL
;
244 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
245 "writer", pthread_self(), (unsigned long)gettid());
249 ret
= rcu_defer_register_thread();
251 printf("Error in rcu_defer_register_thread\n");
261 new = malloc(sizeof(*new));
263 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
264 if (unlikely(wduration
))
265 loop_sleep(wduration
);
266 defer_rcu(free
, old
);
267 defer_rcu(test_cb1
, old
);
268 defer_rcu(test_cb1
, (void *)-2L);
269 defer_rcu(test_cb1
, (void *)-2L);
270 defer_rcu(test_cb1
, old
);
271 defer_rcu(test_cb2
, (void *)-2L);
272 defer_rcu(test_cb2
, (void *)-4L);
273 defer_rcu(test_cb2
, (void *)-2L);
275 if (unlikely(!test_duration_write()))
277 if (unlikely(wdelay
))
281 rcu_defer_unregister_thread();
283 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
284 "writer", pthread_self(), (unsigned long)gettid());
285 tot_nr_writes
[wtidx
] = nr_writes
;
289 void show_usage(int argc
, char **argv
)
291 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
293 printf(" [-r] [-w] (yield reader and/or writer)");
295 printf(" [-d delay] (writer period (us))");
296 printf(" [-c duration] (reader C.S. duration (in loops))");
297 printf(" [-e duration] (writer C.S. duration (in loops))");
298 printf(" [-v] (verbose output)");
299 printf(" [-a cpu#] [-a cpu#]... (affinity)");
303 int main(int argc
, char **argv
)
306 pthread_t
*tid_reader
, *tid_writer
;
308 unsigned long long *count_reader
;
309 unsigned long long tot_reads
= 0, tot_writes
= 0;
313 show_usage(argc
, argv
);
317 err
= sscanf(argv
[1], "%u", &nr_readers
);
319 show_usage(argc
, argv
);
323 err
= sscanf(argv
[2], "%u", &nr_writers
);
325 show_usage(argc
, argv
);
329 err
= sscanf(argv
[3], "%lu", &duration
);
331 show_usage(argc
, argv
);
335 for (i
= 4; i
< argc
; i
++) {
336 if (argv
[i
][0] != '-')
338 switch (argv
[i
][1]) {
341 yield_active
|= YIELD_READ
;
344 yield_active
|= YIELD_WRITE
;
349 show_usage(argc
, argv
);
353 cpu_affinities
[next_aff
++] = a
;
355 printf_verbose("Adding CPU %d affinity\n", a
);
359 show_usage(argc
, argv
);
362 rduration
= atol(argv
[++i
]);
366 show_usage(argc
, argv
);
369 wdelay
= atol(argv
[++i
]);
373 show_usage(argc
, argv
);
376 wduration
= atol(argv
[++i
]);
384 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
385 duration
, nr_readers
, nr_writers
);
386 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
387 printf_verbose("Reader duration : %lu loops.\n", rduration
);
388 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
389 "main", pthread_self(), (unsigned long)gettid());
391 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
392 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
393 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
394 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
398 for (i
= 0; i
< nr_readers
; i
++) {
399 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
404 for (i
= 0; i
< nr_writers
; i
++) {
405 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
419 for (i
= 0; i
< nr_readers
; i
++) {
420 err
= pthread_join(tid_reader
[i
], &tret
);
423 tot_reads
+= count_reader
[i
];
425 for (i
= 0; i
< nr_writers
; i
++) {
426 err
= pthread_join(tid_writer
[i
], &tret
);
429 tot_writes
+= tot_nr_writes
[i
];
432 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
434 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
436 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
437 argv
[0], duration
, nr_readers
, rduration
, wduration
,
438 nr_writers
, wdelay
, tot_reads
, tot_writes
,
439 tot_reads
+ tot_writes
);