usr/src/lib/libumem/common/init_lib.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 (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 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 /*
  30  * Initialization routines for the library version of libumem.
  31  */
  32
  33 #include "umem_base.h"
  34 #include "vmem_base.h"
  35 #include <unistd.h>
  36 #include <dlfcn.h>
  37
  38 void
  39 vmem_heap_init(void)
  40 {
  41         void *handle = dlopen("libmapmalloc.so.1", RTLD_NOLOAD);
  42
  43         if (handle != NULL) {
  44                 log_message("sbrk backend disabled\n");
  45                 vmem_backend = VMEM_BACKEND_MMAP;
  46         }
  47
  48         if ((vmem_backend & VMEM_BACKEND_MMAP) != 0) {
  49                 vmem_backend = VMEM_BACKEND_MMAP;
  50                 (void) vmem_mmap_arena(NULL, NULL);
  51         } else {
  52                 vmem_backend = VMEM_BACKEND_SBRK;
  53                 (void) vmem_sbrk_arena(NULL, NULL);
  54         }
  55 }
  56
  57 /*ARGSUSED*/
  58 void
  59 umem_type_init(caddr_t start, size_t len, size_t pgsize)
  60 {
  61         pagesize = _sysconf(_SC_PAGESIZE);
  62 }
  63
  64 int
  65 umem_get_max_ncpus(void)
  66 {
  67         if (thr_main() != -1)
  68                 return (2 * sysconf(_SC_NPROCESSORS_ONLN));
  69         else
  70                 return (1);
  71 }