125 lines
3.8 KiB
C
125 lines
3.8 KiB
C
/****************************************************************************
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*
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* Open Watcom Project
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*
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* Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved.
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*
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* ========================================================================
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*
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* This file contains Original Code and/or Modifications of Original
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* Code as defined in and that are subject to the Sybase Open Watcom
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* Public License version 1.0 (the 'License'). You may not use this file
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* except in compliance with the License. BY USING THIS FILE YOU AGREE TO
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* ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is
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* provided with the Original Code and Modifications, and is also
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* available at www.sybase.com/developer/opensource.
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*
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* The Original Code and all software distributed under the License are
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* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
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* EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM
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* ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR
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* NON-INFRINGEMENT. Please see the License for the specific language
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* governing rights and limitations under the License.
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*
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* ========================================================================
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*
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* Description: Implementation of near malloc() and _nmalloc().
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*
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****************************************************************************/
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//#include "dll.h" // needs to be first
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#include "variety.h"
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#include <stddef.h>
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#include <stdlib.h>
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#include <malloc.h>
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#include "extfunc.h"
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#include "heapacc.h"
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#include "heap.h"
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#if defined(_M_IX86)
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#pragma aux (__outside_CLIB) __nmemneed;
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#endif
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mheapptr _WCNEAR __nheapbeg = NULL;
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struct miniheapblkp _WCNEAR *__MiniHeapRover = NULL;
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unsigned int __LargestSizeB4MiniHeapRover = 0;
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#if defined(__SMALL_DATA__)
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_WCRTLINK void *malloc( size_t amount )
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{
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return( _nmalloc( amount ) );
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}
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#endif
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_WCRTLINK void _WCNEAR *_nmalloc( size_t amt )
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{
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unsigned largest;
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unsigned size;
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unsigned ptr;
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unsigned char expanded;
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mheapptr miniheap_ptr;
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if( (amt == 0) || (amt > -sizeof(struct heapblk)) ) {
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return( (void _WCNEAR *)NULL );
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}
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// Try to determine which miniheap to begin allocating from.
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// first, round up the amount
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size = (amt + TAG_SIZE + ROUND_SIZE) & ~ROUND_SIZE;
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if( size < FRL_SIZE ) {
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size = FRL_SIZE;
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}
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_AccessNHeap();
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ptr = NULL;
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expanded = 0;
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for(;;) {
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if( size > __LargestSizeB4MiniHeapRover ) {
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miniheap_ptr = __MiniHeapRover;
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if( miniheap_ptr == NULL ) {
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__LargestSizeB4MiniHeapRover = 0;
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miniheap_ptr = __nheapbeg;
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}
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} else {
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__LargestSizeB4MiniHeapRover = 0; // force value to be updated
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miniheap_ptr = __nheapbeg;
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}
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for(;;) {
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if( miniheap_ptr == NULL ) {
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break;
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}
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__MiniHeapRover = miniheap_ptr;
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largest = miniheap_ptr->largest_blk;
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if( largest >= amt ) {
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ptr = __MemAllocator( amt, _DGroup(), (unsigned)miniheap_ptr );
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if( ptr != NULL ) {
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goto lbl_release_heap;
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}
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}
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if( largest > __LargestSizeB4MiniHeapRover ) {
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__LargestSizeB4MiniHeapRover = largest;
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}
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miniheap_ptr = miniheap_ptr->next;
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}
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if( expanded || !__ExpandDGROUP( amt ) ) {
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if( !__nmemneed( amt ) ) {
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break;
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}
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expanded = 0;
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} else {
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expanded = 1;
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}
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}
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lbl_release_heap:
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_ReleaseNHeap();
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return( (void _WCNEAR *)ptr );
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}
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