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/* $OpenBSD: switch.c,v 1.6 2018/05/21 10:14:50 bluhm Exp $ */
/*
* Copyright (c) 1993, 1994, 1995, 1996 by Chris Provenzano and contributors,
* proven@mit.edu 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Chris Provenzano,
* the University of California, Berkeley, and contributors.
* 4. Neither the name of Chris Provenzano, the University, nor the names of
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO 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 CHRIS PROVENZANO, THE REGENTS 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.
*/
/* ==== test_switch.c ========================================================
* Copyright (c) 1993 by Chris Provenzano, proven@athena.mit.edu
*
* Description : Test context switch functionality.
*
* 1.00 93/08/04 proven
* -Started coding this file.
*/
#include <pthread.h>
#include <stdio.h>
#include <err.h>
#include <errno.h>
#include <unistd.h>
#include <stdlib.h>
#include "test.h"
const char buf[] = "abcdefghijklmnopqrstuvwxyz";
char x[sizeof(buf)];
volatile int ending = 0;
/* ==========================================================================
* usage();
*/
static __dead void
usage(void)
{
fprintf(stderr, "usage: %s [-?] [-c count]\n", getprogname());
fprintf(stderr, "count is number of theads, between 2 and 26\n");
exit(1);
}
static void *
new_thread(void *arg)
{
int i;
SET_NAME("writer");
while (!ending) {
CHECKe(write(STDOUT_FILENO, (char *) arg, 1));
x[(char *)arg - buf] = 1;
for (i = 0; i < 999999; i += 1)
;
}
return NULL;
}
int
main(int argc, char *argv[])
{
pthread_t thread;
int ch, count = 4;
long i;
const char *errstr;
while ((ch = getopt(argc, argv, "c:?")) != -1) {
switch (ch) {
case 'c':
count = strtonum(optarg, 2, 26, &errstr);
if (errstr != NULL)
errx(1, "count is %s: %s", errstr, optarg);
break;
default:
usage();
}
}
/* create the threads */
for (i = 0; i < count; i++)
CHECKr(pthread_create(&thread, NULL, new_thread,
(void*)(buf+i)));
/* give all threads a chance to run */
sleep (2);
ending = 1;
for (i = 0; i < count; i++)
ASSERT(x[i]); /* make sure each thread ran */
CHECKe(write(STDOUT_FILENO, "\n", 1));
SUCCEED;
}
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