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