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prosdep.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
00034  * the terms of any one of the MPL, the GPL or the LGPL.
00035  *
00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 #include "prbit.h"
00039 #include "prsystem.h"
00040 
00041 #ifdef XP_UNIX
00042 #include <unistd.h>
00043 #endif
00044 #ifdef SUNOS4
00045 #include "md/sunos4.h"
00046 #endif
00047 #ifdef _WIN32
00048 #include <windows.h>
00049 #endif 
00050 #ifdef XP_BEOS
00051 #include <OS.h>
00052 #endif
00053 
00054 PRInt32 _pr_pageShift;
00055 PRInt32 _pr_pageSize;
00056 
00057 /*
00058 ** Get system page size
00059 */
00060 static void GetPageSize(void)
00061 {
00062        PRInt32 pageSize;
00063 
00064     /* Get page size */
00065 #ifdef XP_UNIX
00066 #if defined SUNOS4 || defined LINUX || defined BSDI || defined AIX \
00067         || defined FREEBSD || defined NETBSD || defined OPENBSD \
00068         || defined DARWIN || defined NEXTSTEP
00069     _pr_pageSize = getpagesize();
00070 #elif defined(HPUX)
00071     /* I have no idea. Don't get me started. --Rob */
00072     _pr_pageSize = sysconf(_SC_PAGE_SIZE);
00073 #else
00074     _pr_pageSize = sysconf(_SC_PAGESIZE);
00075 #endif
00076 #endif /* XP_UNIX */
00077 
00078 #ifdef XP_MAC
00079     _pr_pageSize = 4096;
00080 #endif /* XP_MAC */
00081 
00082 #ifdef XP_BEOS
00083     _pr_pageSize = B_PAGE_SIZE;
00084 #endif
00085 
00086 #ifdef XP_PC
00087 #ifdef _WIN32
00088     SYSTEM_INFO info;
00089     GetSystemInfo(&info);
00090     _pr_pageSize = info.dwPageSize;
00091 #else
00092     _pr_pageSize = 4096;
00093 #endif
00094 #endif /* XP_PC */
00095 
00096        pageSize = _pr_pageSize;
00097        PR_CEILING_LOG2(_pr_pageShift, pageSize);
00098 }
00099 
00100 PR_IMPLEMENT(PRInt32) PR_GetPageShift(void)
00101 {
00102     if (!_pr_pageSize) {
00103        GetPageSize();
00104     }
00105     return _pr_pageShift;
00106 }
00107 
00108 PR_IMPLEMENT(PRInt32) PR_GetPageSize(void)
00109 {
00110     if (!_pr_pageSize) {
00111        GetPageSize();
00112     }
00113     return _pr_pageSize;
00114 }