OpenSolaris_b135/lib/libmtmalloc/tests/exhaust.c

/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 1998-2003 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

#pragma ident	"%Z%%M%	%I%	%E% SMI"

#include <stdio.h>
#include "mtmalloc.h"
#include <unistd.h>
#include <thread.h>
#include <sys/types.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <errno.h>

/*
 * This file tests for swap space exhaustion
 *
 * cc -O -o exhaust exhaust.c -lmtmalloc
 */

void * be_thread(void *);
int iwin = 0;

main(int argc, char ** argv)
{
	int ncpus;
	thread_t tid[512];
	int fd;
	caddr_t stacks[512];

	srand(getpid());
	ncpus = sysconf(_SC_NPROCESSORS_CONF);

	fd = open("/dev/zero", O_RDONLY);

	if (fd < 0) {
		perror("open");
		exit(-1);
	}

	while (ncpus--)
		stacks[ncpus] = mmap(0, 1<<23, PROT_READ|PROT_WRITE,
			MAP_PRIVATE, fd, 0);

	close(fd);

	mallocctl(MTCHUNKSIZE, 150);

	ncpus = sysconf(_SC_NPROCESSORS_CONF);
	while (ncpus--)
		thr_create(stacks[ncpus], 1<<23, be_thread, NULL, THR_BOUND,
			&tid[ncpus]);

	while (thr_join(NULL, NULL, NULL) == 0);

	exit(0);
}

/* ARGSUSED */
void *
be_thread(void *foo)
{
	char *p;

	if (iwin) {
		printf("why am I here\n");
		return;
	}

	if ((p = malloc(rand())) == NULL) {
		iwin = 1;
		fprintf(stderr, "Errno is %d\n", errno);
		perror("malloc");
	} else {
		be_thread(NULL);
		printf("free %p\n", p);
		free(p);
	}

}