4 * Userspace RCU library - test program
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>
38 #include <urcu/tls-compat.h>
44 /* hardcoded number of CPUs */
47 #if defined(_syscall0)
48 _syscall0(pid_t
, gettid
)
49 #elif defined(__NR_gettid)
50 static inline pid_t
gettid(void)
52 return syscall(__NR_gettid
);
55 #warning "use pid as tid"
56 static inline pid_t
gettid(void)
62 #ifndef DYNAMIC_LINK_TEST
65 #define rcu_debug_yield_read()
69 static volatile int test_go
, test_stop
;
71 static unsigned long wdelay
;
73 static int *test_rcu_pointer
;
75 static unsigned long duration
;
77 /* read-side C.S. duration, in loops */
78 static unsigned long rduration
;
80 /* write-side C.S. duration, in loops */
81 static unsigned long wduration
;
83 static inline void loop_sleep(unsigned long loops
)
89 static int verbose_mode
;
91 #define printf_verbose(fmt, args...) \
97 static unsigned int cpu_affinities
[NR_CPUS
];
98 static unsigned int next_aff
= 0;
99 static int use_affinity
= 0;
101 pthread_mutex_t affinity_mutex
= PTHREAD_MUTEX_INITIALIZER
;
103 #ifndef HAVE_CPU_SET_T
104 typedef unsigned long cpu_set_t
;
105 # define CPU_ZERO(cpuset) do { *(cpuset) = 0; } while(0)
106 # define CPU_SET(cpu, cpuset) do { *(cpuset) |= (1UL << (cpu)); } while(0)
109 static void set_affinity(void)
111 #if HAVE_SCHED_SETAFFINITY
114 #endif /* HAVE_SCHED_SETAFFINITY */
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 DEFINE_URCU_TLS(unsigned long long, nr_writes
);
156 static DEFINE_URCU_TLS(unsigned long long, nr_reads
);
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
;
189 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
190 "reader", (unsigned long) pthread_self(),
191 (unsigned long) gettid());
195 rcu_register_thread();
204 local_ptr
= rcu_dereference(test_rcu_pointer
);
205 rcu_debug_yield_read();
207 assert(*local_ptr
== 8);
208 if (caa_unlikely(rduration
))
209 loop_sleep(rduration
);
211 URCU_TLS(nr_reads
)++;
212 if (caa_unlikely(!test_duration_read()))
216 rcu_unregister_thread();
218 /* test extra thread registration */
219 rcu_register_thread();
220 rcu_unregister_thread();
222 *count
= URCU_TLS(nr_reads
);
223 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
224 "reader", (unsigned long) pthread_self(),
225 (unsigned long) gettid());
230 void *thr_writer(void *_count
)
232 unsigned long long *count
= _count
;
235 printf_verbose("thread_begin %s, thread id : %lx, tid %lu\n",
236 "writer", (unsigned long) pthread_self(),
237 (unsigned long) gettid());
247 new = malloc(sizeof(int));
250 old
= rcu_xchg_pointer(&test_rcu_pointer
, new);
251 if (caa_unlikely(wduration
))
252 loop_sleep(wduration
);
257 URCU_TLS(nr_writes
)++;
258 if (caa_unlikely(!test_duration_write()))
260 if (caa_unlikely(wdelay
))
264 printf_verbose("thread_end %s, thread id : %lx, tid %lu\n",
265 "writer", (unsigned long) pthread_self(),
266 (unsigned long) gettid());
267 *count
= URCU_TLS(nr_writes
);
271 void show_usage(int argc
, char **argv
)
273 printf("Usage : %s nr_readers nr_writers duration (s)", argv
[0]);
275 printf(" [-r] [-w] (yield reader and/or writer)");
277 printf(" [-d delay] (writer period (us))");
278 printf(" [-c duration] (reader C.S. duration (in loops))");
279 printf(" [-e duration] (writer C.S. duration (in loops))");
280 printf(" [-v] (verbose output)");
281 printf(" [-a cpu#] [-a cpu#]... (affinity)");
285 int main(int argc
, char **argv
)
288 pthread_t
*tid_reader
, *tid_writer
;
290 unsigned long long *count_reader
, *count_writer
;
291 unsigned long long tot_reads
= 0, tot_writes
= 0;
295 show_usage(argc
, argv
);
299 err
= sscanf(argv
[1], "%u", &nr_readers
);
301 show_usage(argc
, argv
);
305 err
= sscanf(argv
[2], "%u", &nr_writers
);
307 show_usage(argc
, argv
);
311 err
= sscanf(argv
[3], "%lu", &duration
);
313 show_usage(argc
, argv
);
317 for (i
= 4; i
< argc
; i
++) {
318 if (argv
[i
][0] != '-')
320 switch (argv
[i
][1]) {
323 rcu_yield_active
|= RCU_YIELD_READ
;
326 rcu_yield_active
|= RCU_YIELD_WRITE
;
331 show_usage(argc
, argv
);
335 cpu_affinities
[next_aff
++] = a
;
337 printf_verbose("Adding CPU %d affinity\n", a
);
341 show_usage(argc
, argv
);
344 rduration
= atol(argv
[++i
]);
348 show_usage(argc
, argv
);
351 wdelay
= atol(argv
[++i
]);
355 show_usage(argc
, argv
);
358 wduration
= atol(argv
[++i
]);
366 printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
367 duration
, nr_readers
, nr_writers
);
368 printf_verbose("Writer delay : %lu loops.\n", wdelay
);
369 printf_verbose("Reader duration : %lu loops.\n", rduration
);
370 printf_verbose("thread %-6s, thread id : %lx, tid %lu\n",
371 "main", (unsigned long) pthread_self(),
372 (unsigned long)gettid());
374 tid_reader
= malloc(sizeof(*tid_reader
) * nr_readers
);
375 tid_writer
= malloc(sizeof(*tid_writer
) * nr_writers
);
376 count_reader
= malloc(sizeof(*count_reader
) * nr_readers
);
377 count_writer
= malloc(sizeof(*count_writer
) * nr_writers
);
381 for (i
= 0; i
< nr_readers
; i
++) {
382 err
= pthread_create(&tid_reader
[i
], NULL
, thr_reader
,
387 for (i
= 0; i
< nr_writers
; i
++) {
388 err
= pthread_create(&tid_writer
[i
], NULL
, thr_writer
,
402 for (i
= 0; i
< nr_readers
; i
++) {
403 err
= pthread_join(tid_reader
[i
], &tret
);
406 tot_reads
+= count_reader
[i
];
408 for (i
= 0; i
< nr_writers
; i
++) {
409 err
= pthread_join(tid_writer
[i
], &tret
);
412 tot_writes
+= count_writer
[i
];
415 printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads
,
417 printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
419 "wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
420 argv
[0], duration
, nr_readers
, rduration
, wduration
,
421 nr_writers
, wdelay
, tot_reads
, tot_writes
,
422 tot_reads
+ tot_writes
);
423 free(test_rcu_pointer
);