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      1 // SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers (at) efficios.com>
      2 //
      3 // SPDX-License-Identifier: GPL-2.0-or-later
      4 
      5 /*
      6  * Userspace RCU library - test program
      7  */
      8 
      9 #include <stdio.h>
     10 #include <pthread.h>
     11 #include <stdlib.h>
     12 #include <string.h>
     13 #include <sys/types.h>
     14 #include <sys/wait.h>
     15 #include <unistd.h>
     16 #include <stdio.h>
     17 #include <errno.h>
     18 
     19 #include <urcu/arch.h>
     20 #include <urcu/assert.h>
     21 #include <urcu/tls-compat.h>
     22 #include "thread-id.h"
     23 #include "../common/debug-yield.h"
     24 
     25 /* hardcoded number of CPUs */
     26 #define NR_CPUS 16384
     27 
     28 #ifndef DYNAMIC_LINK_TEST
     29 #define _LGPL_SOURCE
     30 #endif
     31 #include "urcu-qsbr.h"
     32 
     33 static unsigned long wdelay;
     34 
     35 static int *test_rcu_pointer;
     36 
     37 static unsigned long duration;
     38 
     39 /* read-side C.S. duration, in loops */
     40 static unsigned long rduration;
     41 
     42 /* write-side C.S. duration, in loops */
     43 static unsigned long wduration;
     44 
     45 static inline void loop_sleep(unsigned long loops)
     46 {
     47 	while (loops-- != 0)
     48 		caa_cpu_relax();
     49 }
     50 
     51 static int verbose_mode;
     52 
     53 #define printf_verbose(fmt, args...)		\
     54 	do {					\
     55 		if (verbose_mode)		\
     56 			printf(fmt, args);	\
     57 	} while (0)
     58 
     59 static unsigned int cpu_affinities[NR_CPUS];
     60 static unsigned int next_aff = 0;
     61 static int use_affinity = 0;
     62 
     63 pthread_mutex_t affinity_mutex = PTHREAD_MUTEX_INITIALIZER;
     64 
     65 static void set_affinity(void)
     66 {
     67 #ifdef HAVE_SCHED_SETAFFINITY
     68 	cpu_set_t mask;
     69 	int cpu, ret;
     70 #endif /* HAVE_SCHED_SETAFFINITY */
     71 
     72 	if (!use_affinity)
     73 		return;
     74 
     75 #ifdef HAVE_SCHED_SETAFFINITY
     76 	ret = pthread_mutex_lock(&affinity_mutex);
     77 	if (ret) {
     78 		perror("Error in pthread mutex lock");
     79 		exit(-1);
     80 	}
     81 	cpu = cpu_affinities[next_aff++];
     82 	ret = pthread_mutex_unlock(&affinity_mutex);
     83 	if (ret) {
     84 		perror("Error in pthread mutex unlock");
     85 		exit(-1);
     86 	}
     87 	CPU_ZERO(&mask);
     88 	CPU_SET(cpu, &mask);
     89 	sched_setaffinity(0, sizeof(mask), &mask);
     90 #endif /* HAVE_SCHED_SETAFFINITY */
     91 }
     92 
     93 static DEFINE_URCU_TLS(unsigned long long, nr_writes);
     94 static DEFINE_URCU_TLS(unsigned long long, nr_reads);
     95 
     96 static unsigned int nr_readers;
     97 static unsigned int nr_writers;
     98 
     99 pthread_mutex_t rcu_copy_mutex = PTHREAD_MUTEX_INITIALIZER;
    100 
    101 static
    102 void *thr_reader(void *_count)
    103 {
    104 	unsigned long long *count = _count;
    105 	int *local_ptr;
    106 
    107 	printf_verbose("thread_begin %s, tid %lu\n",
    108 			"reader", urcu_get_thread_id());
    109 
    110 	set_affinity();
    111 
    112 	rcu_register_thread();
    113 
    114 	urcu_posix_assert(rcu_read_ongoing());
    115 	rcu_thread_offline();
    116 	urcu_posix_assert(!rcu_read_ongoing());
    117 	rcu_thread_online();
    118 
    119 	wait_until_go();
    120 
    121 	for (;;) {
    122 		rcu_read_lock();
    123 		urcu_posix_assert(rcu_read_ongoing());
    124 		local_ptr = rcu_dereference(test_rcu_pointer);
    125 		rcu_debug_yield_read();
    126 		if (local_ptr)
    127 			urcu_posix_assert(*local_ptr == 8);
    128 		if (caa_unlikely(rduration))
    129 			loop_sleep(rduration);
    130 		rcu_read_unlock();
    131 		URCU_TLS(nr_reads)++;
    132 		/* QS each 1024 reads */
    133 		if (caa_unlikely((URCU_TLS(nr_reads) & ((1 << 10) - 1)) == 0))
    134 			rcu_quiescent_state();
    135 		if (caa_unlikely(!test_duration_read()))
    136 			break;
    137 	}
    138 
    139 	rcu_unregister_thread();
    140 
    141 	/* test extra thread registration */
    142 	rcu_register_thread();
    143 	rcu_unregister_thread();
    144 
    145 	*count = URCU_TLS(nr_reads);
    146 	printf_verbose("thread_end %s, tid %lu\n",
    147 			"reader", urcu_get_thread_id());
    148 	return ((void*)1);
    149 
    150 }
    151 
    152 static
    153 void *thr_writer(void *_count)
    154 {
    155 	unsigned long long *count = _count;
    156 	int *new, *old;
    157 
    158 	printf_verbose("thread_begin %s, tid %lu\n",
    159 			"writer", urcu_get_thread_id());
    160 
    161 	set_affinity();
    162 
    163 	wait_until_go();
    164 
    165 	for (;;) {
    166 		new = malloc(sizeof(int));
    167 		urcu_posix_assert(new);
    168 		*new = 8;
    169 		old = rcu_xchg_pointer(&test_rcu_pointer, new);
    170 		if (caa_unlikely(wduration))
    171 			loop_sleep(wduration);
    172 		synchronize_rcu();
    173 		if (old)
    174 			*old = 0;
    175 		free(old);
    176 		URCU_TLS(nr_writes)++;
    177 		if (caa_unlikely(!test_duration_write()))
    178 			break;
    179 		if (caa_unlikely(wdelay))
    180 			loop_sleep(wdelay);
    181 	}
    182 
    183 	printf_verbose("thread_end %s, tid %lu\n",
    184 			"writer", urcu_get_thread_id());
    185 	*count = URCU_TLS(nr_writes);
    186 	return ((void*)2);
    187 }
    188 
    189 static
    190 void show_usage(char **argv)
    191 {
    192 	printf("Usage : %s nr_readers nr_writers duration (s) <OPTIONS>\n",
    193 		argv[0]);
    194 	printf("OPTIONS:\n");
    195 	printf("	[-r] [-w] (yield reader and/or writer)\n");
    196 	printf("	[-d delay] (writer period (us))\n");
    197 	printf("	[-c duration] (reader C.S. duration (in loops))\n");
    198 	printf("	[-e duration] (writer C.S. duration (in loops))\n");
    199 	printf("	[-v] (verbose output)\n");
    200 	printf("	[-a cpu#] [-a cpu#]... (affinity)\n");
    201 	printf("\n");
    202 }
    203 
    204 int main(int argc, char **argv)
    205 {
    206 	int err;
    207 	pthread_t *tid_reader, *tid_writer;
    208 	void *tret;
    209 	unsigned long long *count_reader, *count_writer;
    210 	unsigned long long tot_reads = 0, tot_writes = 0;
    211 	int i, a;
    212 	unsigned int i_thr;
    213 
    214 	if (argc < 4) {
    215 		show_usage(argv);
    216 		return -1;
    217 	}
    218 
    219 	err = sscanf(argv[1], "%u", &nr_readers);
    220 	if (err != 1) {
    221 		show_usage(argv);
    222 		return -1;
    223 	}
    224 
    225 	err = sscanf(argv[2], "%u", &nr_writers);
    226 	if (err != 1) {
    227 		show_usage(argv);
    228 		return -1;
    229 	}
    230 
    231 	err = sscanf(argv[3], "%lu", &duration);
    232 	if (err != 1) {
    233 		show_usage(argv);
    234 		return -1;
    235 	}
    236 
    237 	for (i = 4; i < argc; i++) {
    238 		if (argv[i][0] != '-')
    239 			continue;
    240 		switch (argv[i][1]) {
    241 		case 'r':
    242 			rcu_debug_yield_enable(RCU_YIELD_READ);
    243 			break;
    244 		case 'w':
    245 			rcu_debug_yield_enable(RCU_YIELD_WRITE);
    246 			break;
    247 		case 'a':
    248 			if (argc < i + 2) {
    249 				show_usage(argv);
    250 				return -1;
    251 			}
    252 			a = atoi(argv[++i]);
    253 			cpu_affinities[next_aff++] = a;
    254 			use_affinity = 1;
    255 			printf_verbose("Adding CPU %d affinity\n", a);
    256 			break;
    257 		case 'c':
    258 			if (argc < i + 2) {
    259 				show_usage(argv);
    260 				return -1;
    261 			}
    262 			rduration = atol(argv[++i]);
    263 			break;
    264 		case 'd':
    265 			if (argc < i + 2) {
    266 				show_usage(argv);
    267 				return -1;
    268 			}
    269 			wdelay = atol(argv[++i]);
    270 			break;
    271 		case 'e':
    272 			if (argc < i + 2) {
    273 				show_usage(argv);
    274 				return -1;
    275 			}
    276 			wduration = atol(argv[++i]);
    277 			break;
    278 		case 'v':
    279 			verbose_mode = 1;
    280 			break;
    281 		}
    282 	}
    283 
    284 	printf_verbose("running test for %lu seconds, %u readers, %u writers.\n",
    285 		duration, nr_readers, nr_writers);
    286 	printf_verbose("Writer delay : %lu loops.\n", wdelay);
    287 	printf_verbose("Reader duration : %lu loops.\n", rduration);
    288 	printf_verbose("thread %-6s, tid %lu\n",
    289 			"main", urcu_get_thread_id());
    290 
    291 	tid_reader = calloc(nr_readers, sizeof(*tid_reader));
    292 	tid_writer = calloc(nr_writers, sizeof(*tid_writer));
    293 	count_reader = calloc(nr_readers, sizeof(*count_reader));
    294 	count_writer = calloc(nr_writers, sizeof(*count_writer));
    295 
    296 	next_aff = 0;
    297 
    298 	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
    299 		err = pthread_create(&tid_reader[i_thr], NULL, thr_reader,
    300 				     &count_reader[i_thr]);
    301 		if (err != 0)
    302 			exit(1);
    303 	}
    304 	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
    305 		err = pthread_create(&tid_writer[i_thr], NULL, thr_writer,
    306 				     &count_writer[i_thr]);
    307 		if (err != 0)
    308 			exit(1);
    309 	}
    310 
    311 	test_for(duration);
    312 
    313 	for (i_thr = 0; i_thr < nr_readers; i_thr++) {
    314 		err = pthread_join(tid_reader[i_thr], &tret);
    315 		if (err != 0)
    316 			exit(1);
    317 		tot_reads += count_reader[i_thr];
    318 	}
    319 	for (i_thr = 0; i_thr < nr_writers; i_thr++) {
    320 		err = pthread_join(tid_writer[i_thr], &tret);
    321 		if (err != 0)
    322 			exit(1);
    323 		tot_writes += count_writer[i_thr];
    324 	}
    325 
    326 	printf_verbose("total number of reads : %llu, writes %llu\n", tot_reads,
    327 	       tot_writes);
    328 	printf("SUMMARY %-25s testdur %4lu nr_readers %3u rdur %6lu wdur %6lu "
    329 		"nr_writers %3u "
    330 		"wdelay %6lu nr_reads %12llu nr_writes %12llu nr_ops %12llu\n",
    331 		argv[0], duration, nr_readers, rduration, wduration,
    332 		nr_writers, wdelay, tot_reads, tot_writes,
    333 		tot_reads + tot_writes);
    334 	free(test_rcu_pointer);
    335 	free(tid_reader);
    336 	free(tid_writer);
    337 	free(count_reader);
    338 	free(count_writer);
    339 	return 0;
    340 }
    341