#!/bin/sh
#
# Copyright (c) 2016 EMC Corp.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
# IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
# ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
# OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
# HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
# OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
# SUCH DAMAGE.
#
# The combination of ualarm() firing before and after the select(2) timeout
# triggers select() to return EINTR a number of times.
# Problem only seen on i386.
# Test scenario suggestion by kib@
# "FAIL n = 2389" seen on r302369, no debug build.
# Fixed by: r302573.
. ../default.cfg
dir=/tmp
odir=`pwd`
cd $dir
sed '1,/^EOF/d' < $odir/$0 > $dir/select.c
mycc -o select -Wall -Wextra -O0 -g select.c -lpthread || exit 1
rm -f select.c
cd $odir
/tmp/select
s=$?
rm -f /tmp/select
exit $s
EOF
#include <sys/param.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
static pthread_barrier_t barr;
static sig_atomic_t alarms;
static int lines;
#define LINES 128000
#define N 2000 /* also seen fail with N = 20.000 */
#define PARALLEL 16 /* Fails seen with 1 - 16 */
#define RUNTIME (10 * 60)
static void
handler(int i __unused) {
alarms++;
}
static void
test(void)
{
struct timeval tv;
int i, n, r, s;
r = pthread_barrier_wait(&barr);
if (r != 0 && r != PTHREAD_BARRIER_SERIAL_THREAD)
errc(1, r, "pthread_barrier_wait");
signal(SIGALRM, handler);
s = 0;
for (i = 0; i < lines; i++) {
alarms = 0;
if (arc4random() % 100 < 50)
ualarm(N / 2, 0);
else
ualarm(N * 2, 0);
tv.tv_sec = 0;
tv.tv_usec = N;
n = 0;
do {
r = select(1, NULL, NULL, NULL, &tv);
n++;
} while (r == -1 && errno == EINTR);
if (r == -1)
err(1, "select");
ualarm(0, 0);
if (n > 2) {
fprintf(stderr, "FAIL n = %d, tv = %ld.%06ld\n",
n, (long)tv.tv_sec, tv.tv_usec);
s = 1;
break;
}
if (alarms > 1) {
fprintf(stderr, "FAIL alarms = %d\n", (int)alarms);
s = 2;
break;
}
}
exit(s);
}
int
main(void)
{
pthread_barrierattr_t attr;
time_t start;
int e, i, j, pids[PARALLEL], r, status;
lines = LINES / PARALLEL;
if (lines == 0)
lines = 1;
e = 0;
if ((r = pthread_barrierattr_init(&attr)) != 0)
errc(1, r, "pthread_barrierattr_init");
if ((r = pthread_barrierattr_setpshared(&attr,
PTHREAD_PROCESS_SHARED)) != 0)
errc(1, r, "pthread_barrierattr_setpshared");
if ((r = pthread_barrier_init(&barr, &attr, PARALLEL)) != 0)
errc(1, r, "pthread_barrier_init");
start = time(NULL);
while ((time(NULL) - start) < RUNTIME && e == 0) {
for (i = 0; i < PARALLEL; i++) {
if ((pids[i] = fork()) == 0)
test();
}
for (i = 0; i < PARALLEL; i++) {
waitpid(pids[i], &status, 0);
e += status == 0 ? 0 : 1;
if (status != 0) {
for (j = i + 1; j < PARALLEL; j++)
kill(pids[j], SIGINT);
}
}
}
if ((r = pthread_barrier_destroy(&barr)) > 0)
errc(1, r, "pthread_barrier_destroy");
return (e);
}
