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macgc.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 "primpl.h"
00039 #include "MacMemAllocator.h"
00040 
00041 void _MD_InitGC() {}
00042 
00043 void *_MD_GrowGCHeap(size_t *sizep)
00044 {
00045        void                 *heapPtr = NULL;
00046        size_t               heapSize = *sizep;
00047        
00048        // In previous versions of this code we tried to allocate GC heaps from the application
00049        // heap.  In the 4.0 application, we try to keep our app heap allications to a minimum
00050        // and instead go through our own memory allocation routines.
00051        heapPtr = malloc(heapSize);
00052        
00053        if (heapPtr == NULL) {             
00054               FreeMemoryStats             stats;
00055               
00056               memtotal(heapSize, &stats);        // How much can we allcoate?
00057               
00058               if (stats.maxBlockSize < heapSize)
00059                      heapSize = stats.maxBlockSize;
00060               
00061               heapPtr = malloc(heapSize);
00062               
00063               if (heapPtr == NULL)                      // Now we're hurting
00064                      heapSize = 0;
00065        }
00066        
00067        *sizep = heapSize;
00068        return heapPtr;
00069 }
00070 
00071 
00072 void _MD_FreeGCSegment(void *base, int32 /* len */)
00073 {
00074        free(base);
00075 }