OpenBSD-4.6/regress/lib/libpthread/switch/switch.c

/*	$OpenBSD: switch.c,v 1.5 2003/12/23 20:09:42 miod 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 <errno.h>
#include <unistd.h>
#include <stdlib.h>

#include "test.h"

const char buf[] = "abcdefghijklmnopqrstuvwxyz";
char x[sizeof(buf)];
int fd = 1;

volatile int ending = 0;

/* ==========================================================================
 * usage();
 */
static void
usage(void)
{
    extern char *__progname;
    printf("usage: %s [-?] [-c count]\n", __progname);
	printf("count must be between 2 and 26\n");
    errno = 0;
}

static void *
new_thread(void *arg)
{
	int i;

	SET_NAME("writer");
	while (!ending) {
		CHECKe(write (fd, (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;

	/* Getopt variables. */
	extern int optind, opterr;
	extern char *optarg;

	while ((ch = getopt(argc, argv, "c:?")) != -1)
	  switch (ch)
	    {
	    case 'c':
	      count = atoi(optarg);
	      if ((count > 26) || (count < 2)) {
			  count = 2;
	      }
	      break;
	    case '?':
	      usage();
	      return(OK);
	    default:
	      usage();
	      return(NOTOK);
	    }

	/* 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;
}