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prseg.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998-2000
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either the GNU General Public License Version 2 or later (the "GPL"), or
00026  * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00027  * in which case the provisions of the GPL or the LGPL are applicable instead
00028  * of those above. If you wish to allow use of your version of this file only
00029  * under the terms of either the GPL or the LGPL, and not to allow others to
00030  * use your version of this file under the terms of the MPL, indicate your
00031  * decision by deleting the provisions above and replace them with the notice
00032  * and other provisions required by the GPL or the LGPL. If you do not delete
00033  * the provisions above, a recipient may use your version of this file under
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00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "primpl.h"
00039 
00040 #if defined(_PR_PTHREADS)
00041 
00042 /*
00043 ** The pthreads version doesn't use these functions.
00044 */
00045 void _PR_InitSegs(void)
00046 {
00047 }
00048 
00049 #else /* _PR_PTHREADS */
00050 
00051 void _PR_InitSegs(void)
00052 {
00053        _PR_MD_INIT_SEGS();
00054 }
00055 
00056 /*
00057 ** Allocate a memory segment. The size value is rounded up to the native
00058 ** system page size and a page aligned portion of memory is returned.
00059 ** This memory is not part of the malloc heap. If "vaddr" is not NULL
00060 ** then PR tries to allocate the segment at the desired virtual address.
00061 */
00062 PRSegment* _PR_NewSegment(PRUint32 size, void *vaddr)
00063 {
00064     PRSegment *seg;
00065 
00066        /* calloc the data structure for the segment */
00067     seg = PR_NEWZAP(PRSegment);
00068 
00069     if (seg) {
00070            size = ((size + _pr_pageSize - 1) >> _pr_pageShift) << _pr_pageShift;
00071               /*
00072               **     Now, allocate the actual segment memory (or map under some OS)
00073               **     The OS specific code decides from where or how to allocate memory.
00074               */
00075            if (_PR_MD_ALLOC_SEGMENT(seg, size, vaddr) != PR_SUCCESS) {
00076                      PR_DELETE(seg);
00077                      return NULL;
00078        }
00079        }
00080 
00081     return seg;
00082 }
00083 
00084 /*
00085 ** Free a memory segment.
00086 */
00087 void _PR_DestroySegment(PRSegment *seg)
00088 {
00089        _PR_MD_FREE_SEGMENT(seg);
00090     PR_DELETE(seg);
00091 }
00092 
00093 #endif /* _PR_PTHREADS */