xref: /illumos-gate/usr/src/lib/libumem/common/init_lib.c (revision 0fb96ba1f1ce26ff8b286f8f928769a6afcb00a6)
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 /*
28  * Initialization routines for the library version of libumem.
29  */
30 
31 #include "umem_base.h"
32 #include "vmem_base.h"
33 #include <unistd.h>
34 #include <dlfcn.h>
35 
36 void
37 vmem_heap_init(void)
38 {
39 	void *handle = dlopen("libmapmalloc.so.1", RTLD_NOLOAD);
40 
41 	if (handle != NULL) {
42 		log_message("sbrk backend disabled\n");
43 		vmem_backend = VMEM_BACKEND_MMAP;
44 	}
45 
46 	if ((vmem_backend & VMEM_BACKEND_MMAP) != 0) {
47 		vmem_backend = VMEM_BACKEND_MMAP;
48 		(void) vmem_mmap_arena(NULL, NULL);
49 	} else {
50 		vmem_backend = VMEM_BACKEND_SBRK;
51 		(void) vmem_sbrk_arena(NULL, NULL);
52 	}
53 }
54 
55 /*ARGSUSED*/
56 void
57 umem_type_init(caddr_t start, size_t len, size_t pgsize)
58 {
59 	pagesize = _sysconf(_SC_PAGESIZE);
60 }
61 
62 int
63 umem_get_max_ncpus(void)
64 {
65 	if (thr_main() != -1)
66 		return (2 * sysconf(_SC_NPROCESSORS_ONLN));
67 	else
68 		return (1);
69 }
70