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>
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()
64 #include <urcu-defer.h>
70 static volatile int test_go
, test_stop
;
72 static unsigned long wdelay
;
74 static struct test_array
*test_rcu_pointer
;
76 static unsigned long duration
;
78 /* read-side C.S. duration, in loops */
79 static unsigned long rduration
;
81 /* write-side C.S. duration, in loops */
82 static unsigned long wduration
;
84 static inline void loop_sleep(unsigned long l
)
90 static int verbose_mode
;
92 #define printf_verbose(fmt, args...) \
98 static unsigned int cpu_affinities
[NR_CPUS
];
99 static unsigned int next_aff
= 0;
100 static int use_affinity
= 0;
102 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
104 #ifndef HAVE_CPU_SET_T
105 typedef unsigned long cpu_set_t
;
106 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
107 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
110 static void set_affinity(void)
119 #if HAVE_SCHED_SETAFFINITY
120 ret
= pthread_mutex_lock(&affinity_mutex
);
122 perror("Error in pthread mutex lock");
125 cpu
= cpu_affinities
[next_aff
++];
126 ret
= pthread_mutex_unlock(&affinity_mutex
);
128 perror("Error in pthread mutex unlock");
134 #if SCHED_SETAFFINITY_ARGS == 2
135 sched_setaffinity(0, &mask
);
137 sched_setaffinity(0, sizeof(mask
), &mask
);
139 #endif /* HAVE_SCHED_SETAFFINITY */
143 * returns 0 if test should end.
145 static int test_duration_write(void)
150 static int test_duration_read(void)
155 static unsigned long long __thread nr_writes
;
156 static unsigned long long __thread nr_reads
;
159 unsigned long long __attribute__((aligned(CAA_CACHE_LINE_SIZE
))) *tot_nr_writes
;
161 static unsigned int nr_readers
;
162 static unsigned int nr_writers
;
164 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
166 void rcu_copy_mutex_lock(void)
169 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
171 perror("Error in pthread mutex lock");
176 void rcu_copy_mutex_unlock(void)
180 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
182 perror("Error in pthread mutex unlock");
187 void *thr_reader(void *_count
)
189 unsigned long long *count
= _count
;
190 struct test_array
*local_ptr
;
192 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
193 "reader", pthread_self(), (unsigned long)gettid());
197 rcu_register_thread();
206 local_ptr
= rcu_dereference(test_rcu_pointer
);
209 assert(local_ptr
->a
== 8);
210 if (unlikely(rduration
))
211 loop_sleep(rduration
);
214 if (unlikely(!test_duration_read()))
218 rcu_unregister_thread();
221 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
222 "reader", pthread_self(), (unsigned long)gettid());
227 static void test_cb2(void *data
)
231 static void test_cb1(void *data
)
235 void *thr_writer(void *data
)
237 unsigned long wtidx
= (unsigned long)data
;
238 struct test_array
*new, *old
= NULL
;
241 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
242 "writer", pthread_self(), (unsigned long)gettid());
246 ret
= rcu_defer_register_thread();
248 printf("Error in rcu_defer_register_thread\n");
258 new = malloc(sizeof(*new));
260 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
261 if (unlikely(wduration
))
262 loop_sleep(wduration
);
263 defer_rcu(free
, old
);
264 defer_rcu(test_cb1
, old
);
265 defer_rcu(test_cb1
, (void *)-2L);
266 defer_rcu(test_cb1
, (void *)-2L);
267 defer_rcu(test_cb1
, old
);
268 defer_rcu(test_cb2
, (void *)-2L);
269 defer_rcu(test_cb2
, (void *)-4L);
270 defer_rcu(test_cb2
, (void *)-2L);
272 if (unlikely(!test_duration_write()))
274 if (unlikely(wdelay
))
278 rcu_defer_unregister_thread();
280 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
281 "writer", pthread_self(), (unsigned long)gettid());
282 tot_nr_writes
[wtidx
] = nr_writes
;
286 void show_usage(int argc
, char **argv
)
288 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
290 printf(" [-r] [-w] (yield reader and/or writer)");
292 printf(" [-d delay] (writer period (us))");
293 printf(" [-c duration] (reader C.S. duration (in loops))");
294 printf(" [-e duration] (writer C.S. duration (in loops))");
295 printf(" [-v] (verbose output)");
296 printf(" [-a cpu#] [-a cpu#]... (affinity)");
300 int main(int argc
, char **argv
)
303 pthread_t
*tid_reader
, *tid_writer
;
305 unsigned long long *count_reader
;
306 unsigned long long tot_reads
= 0, tot_writes
= 0;
310 show_usage(argc
, argv
);
314 err
= sscanf(argv
[1], "%u", &nr_readers
);
316 show_usage(argc
, argv
);
320 err
= sscanf(argv
[2], "%u", &nr_writers
);
322 show_usage(argc
, argv
);
326 err
= sscanf(argv
[3], "%lu", &duration
);
328 show_usage(argc
, argv
);
332 for (i
= 4; i
< argc
; i
++) {
333 if (argv
[i
][0] != '-')
335 switch (argv
[i
][1]) {
338 yield_active
|= YIELD_READ
;
341 yield_active
|= YIELD_WRITE
;
346 show_usage(argc
, argv
);
350 cpu_affinities
[next_aff
++] = a
;
352 printf_verbose("Adding CPU %d affinity\n", a
);
356 show_usage(argc
, argv
);
359 rduration
= atol(argv
[++i
]);
363 show_usage(argc
, argv
);
366 wdelay
= atol(argv
[++i
]);
370 show_usage(argc
, argv
);
373 wduration
= atol(argv
[++i
]);
381 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
382 duration
, nr_readers
, nr_writers
);
383 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
384 printf_verbose("Reader duration : %lu loops.\n", rduration
);
385 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
386 "main", pthread_self(), (unsigned long)gettid());
388 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
389 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
390 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
391 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
395 for (i
= 0; i
< nr_readers
; i
++) {
396 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
401 for (i
= 0; i
< nr_writers
; i
++) {
402 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
416 for (i
= 0; i
< nr_readers
; i
++) {
417 err
= pthread_join(tid_reader
[i
], &tret
);
420 tot_reads
+= count_reader
[i
];
422 for (i
= 0; i
< nr_writers
; i
++) {
423 err
= pthread_join(tid_writer
[i
], &tret
);
426 tot_writes
+= tot_nr_writes
[i
];
429 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
431 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
433 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
434 argv
[0], duration
, nr_readers
, rduration
, wduration
,
435 nr_writers
, wdelay
, tot_reads
, tot_writes
,
436 tot_reads
+ tot_writes
);