usr/src/lib/libmtmalloc/tests/exhaust.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1998-2003 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <stdio.h>
  30 #include "mtmalloc.h"
  31 #include <unistd.h>
  32 #include <thread.h>
  33 #include <sys/types.h>
  34 #include <sys/mman.h>
  35 #include <fcntl.h>
  36 #include <errno.h>
  37
  38 /*
  39  * This file tests for swap space exhaustion
  40  *
  41  * cc -O -o exhaust exhaust.c -lmtmalloc
  42  */
  43
  44 void * be_thread(void *);
  45 int iwin = 0;
  46
  47 main(int argc, char ** argv)
  48 {
  49         int ncpus;
  50         thread_t tid[512];
  51         int fd;
  52         caddr_t stacks[512];
  53
  54         srand(getpid());
  55         ncpus = sysconf(_SC_NPROCESSORS_CONF);
  56
  57         fd = open("/dev/zero", O_RDONLY);
  58
  59         if (fd < 0) {
  60                 perror("open");
  61                 exit(-1);
  62         }
  63
  64         while (ncpus--)
  65                 stacks[ncpus] = mmap(0, 1<<23, PROT_READ|PROT_WRITE,
  66                         MAP_PRIVATE, fd, 0);
  67
  68         close(fd);
  69
  70         mallocctl(MTCHUNKSIZE, 150);
  71
  72         ncpus = sysconf(_SC_NPROCESSORS_CONF);
  73         while (ncpus--)
  74                 thr_create(stacks[ncpus], 1<<23, be_thread, NULL, THR_BOUND,
  75                         &tid[ncpus]);
  76
  77         while (thr_join(NULL, NULL, NULL) == 0);
  78
  79         exit(0);
  80 }
  81
  82 /* ARGSUSED */
  83 void *
  84 be_thread(void *foo)
  85 {
  86         char *p;
  87
  88         if (iwin) {
  89                 printf("why am I here\n");
  90                 return;
  91         }
  92
  93         if ((p = malloc(rand())) == NULL) {
  94                 iwin = 1;
  95                 fprintf(stderr, "Errno is %d\n", errno);
  96                 perror("malloc");
  97         } else {
  98                 be_thread(NULL);
  99                 printf("free %p\n", p);
 100                 free(p);
 101         }
 102
 103 }