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/* $OpenBSD: unsendrecvthr.c,v 1.1 2021/12/09 23:37:18 mvs Exp $ */
/*
* Copyright (c) 2021 Vitaliy Makkoveev <mvs@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* Create the pair of SOCK_SEQPACKET sockets and perform #count_of_cpus
* simultaneous writes on each of them. In half of transmissions the
* sockets will be re-locked in kernel space. Be sure no data corruption
* or loss.
*/
#include <sys/types.h>
#include <sys/select.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/un.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <err.h>
#include <pthread.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static pthread_mutex_t therr_mtx = PTHREAD_MUTEX_INITIALIZER;
static void
therr(int eval, const char *fmt, ...)
{
va_list ap;
pthread_mutex_lock(&therr_mtx);
va_start(ap, fmt);
verr(eval, fmt, ap);
va_end(ap);
}
static void
therrx(int eval, const char *fmt, ...)
{
va_list ap;
pthread_mutex_lock(&therr_mtx);
va_start(ap, fmt);
verrx(eval, fmt, ap);
va_end(ap);
}
static void
therrc(int eval, int code, const char *fmt, ...)
{
va_list ap;
pthread_mutex_lock(&therr_mtx);
va_start(ap, fmt);
verrc(eval, code, fmt, ap);
va_end(ap);
}
struct data {
int id;
unsigned int cnt;
};
struct thr_tx_arg {
int s;
int id;
};
struct rx_data {
unsigned int cnt;
};
struct thr_rx_arg {
int s;
int rx_data_num;
struct rx_data *rx_data;
};
static void *
thr_tx(void *arg)
{
struct data data;
int s = ((struct thr_tx_arg *)arg)->s;
data.id = ((struct thr_tx_arg *)arg)->id;
data.cnt = 1;
while (1) {
ssize_t ret;
if ((ret = send(s, &data, sizeof(data), 0)) < 0)
therr(1, "send");
if (ret != sizeof(data))
therrx(1, "send: wrong data size");
data.cnt++;
}
return NULL;
}
static void *
thr_rx(void *arg)
{
int s = ((struct thr_rx_arg *)arg)->s;
int rx_data_num = ((struct thr_rx_arg *)arg)->rx_data_num;
struct rx_data *rx_data = ((struct thr_rx_arg *)arg)->rx_data;
while (1) {
struct data data;
ssize_t ret;
if ((ret = recv(s, &data, sizeof(data), 0)) < 0)
therr(1, "recv");
if (ret != sizeof(data))
therrx(1, "recv: wrong data size");
if (data.id >= rx_data_num)
therrx(1, "recv: wrong id");
if (data.cnt != (unsigned int)(rx_data[data.id].cnt + 1)) {
therrx(1, "recv: data loss %d -> %d",
rx_data[data.id].cnt, data.cnt);
}
rx_data[data.id].cnt = data.cnt;
}
return NULL;
}
int
main(int argc, char *argv[])
{
struct timespec testtime = {
.tv_sec = 60,
.tv_nsec = 0,
};
int mib[2], ncpu;
size_t len;
struct rx_data *rx_data[2];
struct thr_rx_arg rx_args[2];
struct thr_tx_arg *tx_args[2];
int s[2], i, j;
if (argc == 2 && !strcmp(argv[1], "--infinite"))
testtime.tv_sec = (10 * 365 * 86400);
mib[0] = CTL_HW;
mib[1] = HW_NCPUONLINE;
len = sizeof(ncpu);
if (sysctl(mib, 2, &ncpu, &len, NULL, 0) < 0)
err(1, "sysctl");
if (ncpu <= 0)
errx(1, "Wrong number of CPUs online: %d", ncpu);
if (socketpair(AF_UNIX, SOCK_SEQPACKET, 0, s) < 0)
err(1, "socketpair");
for (i = 0; i < 2; ++i) {
if (!(rx_data[i] = calloc(ncpu, sizeof(*rx_data))))
err(1, "calloc");
for (j = 0; j < ncpu; ++j)
rx_data[i][j].cnt = 0;
}
for (i = 0; i < 2; ++i) {
rx_args[i].s = s[i];
rx_args[i].rx_data_num = ncpu;
rx_args[i].rx_data = rx_data[i];
}
for (i = 0; i < 2; ++i) {
if (!(tx_args[i] = calloc(ncpu, sizeof(*tx_args))))
err(1, "calloc");
for (j = 0; j < ncpu; ++j) {
tx_args[i][j].s = s[i];
tx_args[i][j].id = j;
}
}
for (i = 0; i < 2; ++i) {
pthread_t thr;
int error;
error = pthread_create(&thr, NULL, thr_rx, &rx_args[i]);
if (error)
therrc(1, error, "pthread_create");
}
for (i = 0; i < 2; ++i) {
pthread_t thr;
int error;
for (j = 0; j < ncpu; ++j) {
error = pthread_create(&thr, NULL,
thr_tx, &tx_args[i][j]);
if (error)
therrc(1, error, "pthread_create");
}
}
nanosleep(&testtime, NULL);
return 0;
}
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