127 lines
3.8 KiB
C
127 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: Routines to grow heap (allocate memory from OS).
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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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#if defined(__QNX__)
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#elif defined(__LINUX__)
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#elif defined(__OS2__)
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#elif defined(_M_IX86)
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// #include "tinyio.h"
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#endif
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#include "heap.h"
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#include "heapacc.h"
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#if defined(M_I86)
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_WCRTLINK void _fheapgrow( void )
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{
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/* multiple heaps are used so growing the far heaps is not necessary */
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}
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#endif
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#if defined(__SMALL_DATA__)
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_WCRTLINK void _heapgrow( void )
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{
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_nheapgrow();
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}
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#else
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_WCRTLINK void _heapgrow( void )
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{
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_fheapgrow();
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}
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#endif
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_WCRTLINK void _nheapgrow( void )
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{
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#if defined(__WINDOWS_286__) || defined(__386__) || defined(__AXP__) || defined(__PPC__) || defined(__MIPS__)
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_nfree( _nmalloc( 1 ) ); /* get something into the heap */
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#else
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unsigned max_paras;
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unsigned curr_paras;
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unsigned diff_paras;
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unsigned expand;
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_AccessNHeap();
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/* calculate # pages which always has extra slack space (ie. 0x10) */
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curr_paras = (( _curbrk + 0x10 ) & ~0x0f ) >> 4;
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if( curr_paras == 0 ) {
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/* we're already at 64k */
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_ReleaseNHeap();
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return;
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}
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#if defined(__QNX__)
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if( qnx_segment_realloc( _DGroup(), 65536L ) == -1 ) {
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_ReleaseNHeap();
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return;
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}
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max_paras = PARAS_IN_64K;
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#elif defined(__OS2__)
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if( DosReallocSeg( 0, _DGroup() ) ) {
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_ReleaseNHeap();
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return;
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}
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max_paras = PARAS_IN_64K;
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#else
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if( _osmode != DOS_MODE ) { /* 23-apr-91 */
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max_paras = PARAS_IN_64K;
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} else {
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max_paras = TinyMaxSet( _psp );
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/* subtract off code size */
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max_paras -= _DGroup() - _psp;
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if( max_paras > PARAS_IN_64K ) {
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max_paras = PARAS_IN_64K;
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}
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}
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#endif
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if( max_paras <= curr_paras ) {
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/* '<' -> something is wrong, '==' -> can't change size */
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_ReleaseNHeap();
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return;
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}
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diff_paras = max_paras - curr_paras;
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expand = (( diff_paras + 1 ) << 4 ) - ( _curbrk & 0x0f );
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expand += __LastFree(); /* compensate for _expand's adjustment */
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_ReleaseNHeap();
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_nfree( _nmalloc( expand - ( sizeof( size_t ) + sizeof(frl) ) ) );
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#endif
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}
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