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#!/bin/sh
#
# Copyright (c) 2025 Peter Holm <pho@FreeBSD.org>
#
# SPDX-License-Identifier: BSD-2-Clause
#
. ../default.cfg
set -u
prog=$(basename "$0" .sh)
cat > /tmp/$prog.c <<EOF
#include <sys/types.h>
#include <sys/mman.h>
#include <assert.h>
#include <err.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static pthread_mutex_t write_mutex;
static volatile int done;
static int go, n, *once, *p, ps;
static void *
wr(void *arg)
{
int idx;
alarm(180);
idx = *(int *)arg;
while (go == 0)
usleep(100);
while (go == 1) {
while (go == 1 && once[idx] == 0)
usleep(100);
if (go == 0)
break;
p[idx]++;
once[idx] = 0;
pthread_mutex_lock(&write_mutex);
done++;
pthread_mutex_unlock(&write_mutex);
}
return(NULL);
}
static void
setonce(int val)
{
int i;
for (i = 0; i < n; i++)
once[i] = val;
}
static void
usage(char *prog) {
fprintf(stderr, "Usage: %s <number of threads>\n", prog);
_exit(1);
}
int
main(int argc, char *argv[])
{
pthread_t *tid;
time_t start;
int *arg;
int e, i, nb, r;
if (argc != 2)
usage(argv[0]);
if (sscanf(argv[1], "%d", &n) != 1)
usage(argv[0]);
if (n > 1)
n--;
if ((tid = calloc(n, sizeof(pthread_t *))) == NULL)
err(1, "calloc()");
if ((once = calloc(n, sizeof(int *))) == NULL)
err(1, "calloc()");
setonce(0);
ps = getpagesize();
p = mmap(NULL, n * ps, PROT_READ, MAP_PRIVATE | MAP_ANON, -1, 0);
go = 0;
pthread_mutex_init(&write_mutex, NULL);
for (i = 0; i < n; i++) {
arg = malloc(sizeof(int));
*arg = i;
if ((e = pthread_create(&tid[i], NULL, wr, (void *)arg)) != 0)
errc(1, e, "pthread_create()");
}
go = 1;
nb = 0;
start = time(NULL);
while (time(NULL) - start < 120) {
if (mprotect(p, n * ps, PROT_READ|PROT_WRITE) == -1)
err(1, "mprotect(PROT_READ)");
done = 0;
setonce(1);
while (done != n)
usleep(100);
if (mprotect(p, n * ps, PROT_READ) == -1)
err(1, "mprotect(PROT_READ)");
nb++;
usleep(100);
}
go = 0;
for (i = 0; i < n; i++) {
if ((e = pthread_join(tid[i], NULL)) != 0)
errc(1, e, "pthread_join() in loop %d", i);
}
r = 0;
for (i = 1; i < n; i++) {
if (p[0] != p[i])
r++;
}
if (r != 0) {
fprintf(stderr, "%d loops.\n", nb);
for (i = 0; i < n; i++)
fprintf(stderr, "p[%3d] = %d\n", i, p[i]);
}
return (r);
}
EOF
mycc -o /tmp/$prog -Wall -Wextra -O0 -g /tmp/$prog.c -lpthread || exit 1
n=`sysctl -n hw.ncpu`
if [ $# -eq 1 ]; then
echo $1 | grep -Eq '^[0-9]+$' && n=$1
fi
../testcases/swap/swap -t 2m > /dev/null &
sleep 10
/tmp/$prog $n; s=$?
pkill -9 swap
wait
rm -d /tmp/$prog /tmp/$prog.c
exit $s
|
