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// SPDX-FileCopyrightText: 2009 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
//
// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Per thread locks - test program
*/
#include <stdio.h>
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <stdio.h>
#include <pthread.h>
#include <errno.h>
#include <urcu/arch.h>
#include <urcu/assert.h>
#include "thread-id.h"
#include <urcu.h>
struct test_array {
int a;
};
static struct test_array test_array = { 8 };
struct per_thread_lock {
pthread_mutex_t lock;
} __attribute__((__aligned__(CAA_CACHE_LINE_SIZE))); /* cache-line aligned */
static struct per_thread_lock *per_thread_lock;
#define OUTER_READ_LOOP 200U
#define INNER_READ_LOOP 100000U
#define READ_LOOP ((unsigned long long)OUTER_READ_LOOP * INNER_READ_LOOP)
#define OUTER_WRITE_LOOP 10U
#define INNER_WRITE_LOOP 200U
#define WRITE_LOOP ((unsigned long long)OUTER_WRITE_LOOP * INNER_WRITE_LOOP)
static int num_read;
static int num_write;
#define NR_READ num_read
#define NR_WRITE num_write
static caa_cycles_t __attribute__((__aligned__(CAA_CACHE_LINE_SIZE))) *reader_time;
static caa_cycles_t __attribute__((__aligned__(CAA_CACHE_LINE_SIZE))) *writer_time;
static
void *thr_reader(void *arg)
{
caa_cycles_t time1, time2;
long tidx = (long)arg;
unsigned int i, j;
int ret;
printf("thread_begin %s, tid %lu\n",
"reader", urcu_get_thread_id());
sleep(2);
time1 = caa_get_cycles();
for (i = 0; i < OUTER_READ_LOOP; i++) {
for (j = 0; j < INNER_READ_LOOP; j++) {
ret = pthread_mutex_lock(&per_thread_lock[tidx].lock);
if (ret) {
perror("Error in pthread mutex lock");
exit(-1);
}
urcu_posix_assert(test_array.a == 8);
ret = pthread_mutex_unlock(&per_thread_lock[tidx].lock);
if (ret) {
perror("Error in pthread mutex unlock");
exit(-1);
}
}
}
time2 = caa_get_cycles();
reader_time[tidx] = time2 - time1;
sleep(2);
printf("thread_end %s, tid %lu\n",
"reader", urcu_get_thread_id());
return ((void*)1);
}
static
void *thr_writer(void *arg)
{
caa_cycles_t time1, time2;
unsigned int i, j;
long tidx;
int ret;
printf("thread_begin %s, tid %lu\n",
"writer", urcu_get_thread_id());
sleep(2);
for (i = 0; i < OUTER_WRITE_LOOP; i++) {
for (j = 0; j < INNER_WRITE_LOOP; j++) {
time1 = caa_get_cycles();
for (tidx = 0; tidx < NR_READ; tidx++) {
ret = pthread_mutex_lock(&per_thread_lock[tidx].lock);
if (ret) {
perror("Error in pthread mutex lock");
exit(-1);
}
}
test_array.a = 8;
for (tidx = NR_READ - 1; tidx >= 0; tidx--) {
ret = pthread_mutex_unlock(&per_thread_lock[tidx].lock);
if (ret) {
perror("Error in pthread mutex unlock");
exit(-1);
}
}
time2 = caa_get_cycles();
writer_time[(unsigned long)arg] += time2 - time1;
usleep(1);
}
}
printf("thread_end %s, tid %lu\n",
"writer", urcu_get_thread_id());
return ((void*)2);
}
int main(int argc, char **argv)
{
int err;
pthread_t *tid_reader, *tid_writer;
void *tret;
int i;
caa_cycles_t tot_rtime = 0;
caa_cycles_t tot_wtime = 0;
if (argc < 2) {
printf("Usage : %s nr_readers nr_writers\n", argv[0]);
exit(-1);
}
num_read = atoi(argv[1]);
num_write = atoi(argv[2]);
reader_time = calloc(num_read, sizeof(*reader_time));
writer_time = calloc(num_write, sizeof(*writer_time));
tid_reader = calloc(num_read, sizeof(*tid_reader));
tid_writer = calloc(num_write, sizeof(*tid_writer));
printf("thread %-6s, tid %lu\n",
"main", urcu_get_thread_id());
per_thread_lock = malloc(sizeof(struct per_thread_lock) * NR_READ);
for (i = 0; i < NR_READ; i++) {
pthread_mutex_init(&per_thread_lock[i].lock, NULL);
}
for (i = 0; i < NR_READ; i++) {
err = pthread_create(&tid_reader[i], NULL, thr_reader,
(void *)(long)i);
if (err != 0)
exit(1);
}
for (i = 0; i < NR_WRITE; i++) {
err = pthread_create(&tid_writer[i], NULL, thr_writer,
(void *)(long)i);
if (err != 0)
exit(1);
}
sleep(10);
for (i = 0; i < NR_READ; i++) {
err = pthread_join(tid_reader[i], &tret);
if (err != 0)
exit(1);
tot_rtime += reader_time[i];
}
for (i = 0; i < NR_WRITE; i++) {
err = pthread_join(tid_writer[i], &tret);
if (err != 0)
exit(1);
tot_wtime += writer_time[i];
}
printf("Time per read : %g cycles\n",
(double)tot_rtime / ((double)NR_READ * (double)READ_LOOP));
printf("Time per write : %g cycles\n",
(double)tot_wtime / ((double)NR_WRITE * (double)WRITE_LOOP));
free(per_thread_lock);
free(reader_time);
free(writer_time);
free(tid_reader);
free(tid_writer);
return 0;
}
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