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.
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 static inline void loop_sleep(unsigned long l
)
87 static int verbose_mode
;
89 #define printf_verbose(fmt, args...) \
95 static unsigned int cpu_affinities
[NR_CPUS
];
96 static unsigned int next_aff
= 0;
97 static int use_affinity
= 0;
99 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
101 #ifndef HAVE_CPU_SET_T
102 typedef unsigned long cpu_set_t
;
103 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
104 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
107 static void set_affinity(void)
116 #if HAVE_SCHED_SETAFFINITY
117 ret
= pthread_mutex_lock(&affinity_mutex
);
119 perror("Error in pthread mutex lock");
122 cpu
= cpu_affinities
[next_aff
++];
123 ret
= pthread_mutex_unlock(&affinity_mutex
);
125 perror("Error in pthread mutex unlock");
131 #if SCHED_SETAFFINITY_ARGS == 2
132 sched_setaffinity(0, &mask
);
134 sched_setaffinity(0, sizeof(mask
), &mask
);
136 #endif /* HAVE_SCHED_SETAFFINITY */
140 * returns 0 if test should end.
142 static int test_duration_write(void)
147 static int test_duration_read(void)
152 static unsigned long long __thread nr_writes
;
153 static unsigned long long __thread nr_reads
;
156 unsigned long long __attribute__((aligned(CACHE_LINE_SIZE
))) *tot_nr_writes
;
158 static unsigned int nr_readers
;
159 static unsigned int nr_writers
;
161 pthread_mutex_t rcu_copy_mutex
= PTHREAD_MUTEX_INITIALIZER
;
163 void rcu_copy_mutex_lock(void)
166 ret
= pthread_mutex_lock(&rcu_copy_mutex
);
168 perror("Error in pthread mutex lock");
173 void rcu_copy_mutex_unlock(void)
177 ret
= pthread_mutex_unlock(&rcu_copy_mutex
);
179 perror("Error in pthread mutex unlock");
184 void *thr_reader(void *_count
)
186 unsigned long long *count
= _count
;
187 struct test_array
*local_ptr
;
189 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
190 "reader", pthread_self(), (unsigned long)gettid());
194 rcu_register_thread();
203 local_ptr
= rcu_dereference(test_rcu_pointer
);
206 assert(local_ptr
->a
== 8);
207 if (unlikely(rduration
))
208 loop_sleep(rduration
);
211 if (unlikely(!test_duration_read()))
215 rcu_unregister_thread();
218 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
219 "reader", pthread_self(), (unsigned long)gettid());
224 static void test_cb2(void *data
)
228 static void test_cb1(void *data
)
232 void *thr_writer(void *data
)
234 unsigned long wtidx
= (unsigned long)data
;
235 struct test_array
*new, *old
= NULL
;
237 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
238 "writer", pthread_self(), (unsigned long)gettid());
242 rcu_defer_register_thread();
250 new = malloc(sizeof(*new));
252 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
253 defer_rcu(free
, old
);
254 defer_rcu(test_cb1
, old
);
255 defer_rcu(test_cb1
, (void *)-2L);
256 defer_rcu(test_cb1
, (void *)-2L);
257 defer_rcu(test_cb1
, old
);
258 defer_rcu(test_cb2
, (void *)-2L);
259 defer_rcu(test_cb2
, (void *)-4L);
260 defer_rcu(test_cb2
, (void *)-2L);
262 if (unlikely(!test_duration_write()))
264 if (unlikely(wdelay
))
268 rcu_defer_unregister_thread();
270 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
271 "writer", pthread_self(), (unsigned long)gettid());
272 tot_nr_writes
[wtidx
] = nr_writes
;
276 void show_usage(int argc
, char **argv
)
278 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
280 printf(" [-r] [-w] (yield reader and/or writer)");
282 printf(" [-d delay] (writer period (us))");
283 printf(" [-c duration] (reader C.S. duration (in loops))");
284 printf(" [-v] (verbose output)");
285 printf(" [-a cpu#] [-a cpu#]... (affinity)");
289 int main(int argc
, char **argv
)
292 pthread_t
*tid_reader
, *tid_writer
;
294 unsigned long long *count_reader
;
295 unsigned long long tot_reads
= 0, tot_writes
= 0;
299 show_usage(argc
, argv
);
303 err
= sscanf(argv
[1], "%u", &nr_readers
);
305 show_usage(argc
, argv
);
309 err
= sscanf(argv
[2], "%u", &nr_writers
);
311 show_usage(argc
, argv
);
315 err
= sscanf(argv
[3], "%lu", &duration
);
317 show_usage(argc
, argv
);
321 for (i
= 4; i
< argc
; i
++) {
322 if (argv
[i
][0] != '-')
324 switch (argv
[i
][1]) {
327 yield_active
|= YIELD_READ
;
330 yield_active
|= YIELD_WRITE
;
335 show_usage(argc
, argv
);
339 cpu_affinities
[next_aff
++] = a
;
341 printf_verbose("Adding CPU %d affinity\n", a
);
345 show_usage(argc
, argv
);
348 rduration
= atol(argv
[++i
]);
352 show_usage(argc
, argv
);
355 wdelay
= atol(argv
[++i
]);
363 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
364 duration
, nr_readers
, nr_writers
);
365 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
366 printf_verbose("Reader duration : %lu loops.\n", rduration
);
367 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
368 "main", pthread_self(), (unsigned long)gettid());
370 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
371 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
372 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
373 tot_nr_writes
= malloc(sizeof(*tot_nr_writes
) * nr_writers
);
377 for (i
= 0; i
< nr_readers
; i
++) {
378 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
383 for (i
= 0; i
< nr_writers
; i
++) {
384 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
398 for (i
= 0; i
< nr_readers
; i
++) {
399 err
= pthread_join(tid_reader
[i
], &tret
);
402 tot_reads
+= count_reader
[i
];
404 for (i
= 0; i
< nr_writers
; i
++) {
405 err
= pthread_join(tid_writer
[i
], &tret
);
408 tot_writes
+= tot_nr_writes
[i
];
411 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
413 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu "
415 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
416 argv
[0], duration
, nr_readers
, rduration
,
417 nr_writers
, wdelay
, tot_reads
, tot_writes
,
418 tot_reads
+ tot_writes
);