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| /**************************************************************************** |
| * |
| * Open Watcom Project |
| * |
| * Portions Copyright (c) 1983-2002 Sybase, Inc. All Rights Reserved. |
| * |
| * ======================================================================== |
| * |
| * This file contains Original Code and/or Modifications of Original |
| * Code as defined in and that are subject to the Sybase Open Watcom |
| * Public License version 1.0 (the 'License'). You may not use this file |
| * except in compliance with the License. BY USING THIS FILE YOU AGREE TO |
| * ALL TERMS AND CONDITIONS OF THE LICENSE. A copy of the License is |
| * provided with the Original Code and Modifications, and is also |
| * available at www.sybase.com/developer/opensource. |
| * |
| * The Original Code and all software distributed under the License are |
| * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
| * EXPRESS OR IMPLIED, AND SYBASE AND ALL CONTRIBUTORS HEREBY DISCLAIM |
| * ALL SUCH WARRANTIES, INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF |
| * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR |
| * NON-INFRINGEMENT. Please see the License for the specific language |
| * governing rights and limitations under the License. |
| * |
| * ======================================================================== |
| * |
| * Description: Routines to grow heap (allocate memory from OS). |
| * |
| ****************************************************************************/ |
| |
| |
| //#include "dll.h" // needs to be first |
| #include "variety.h" |
| #include <stddef.h> |
| #include <stdlib.h> |
| #include <malloc.h> |
| #if defined(__QNX__) |
| #elif defined(__LINUX__) |
| #elif defined(__OS2__) |
| #elif defined(_M_IX86) |
| // #include "tinyio.h" |
| #endif |
| #include "heap.h" |
| #include "heapacc.h" |
| |
| #if defined(M_I86) |
| |
| _WCRTLINK void _fheapgrow( void ) |
| { |
| /* multiple heaps are used so growing the far heaps is not necessary */ |
| } |
| |
| #endif |
| |
| |
| #if defined(__SMALL_DATA__) |
| |
| _WCRTLINK void _heapgrow( void ) |
| { |
| _nheapgrow(); |
| } |
| |
| #else |
| |
| _WCRTLINK void _heapgrow( void ) |
| { |
| _fheapgrow(); |
| } |
| |
| #endif |
| |
| |
| _WCRTLINK void _nheapgrow( void ) |
| { |
| #if defined(__WINDOWS_286__) || defined(__386__) || defined(__AXP__) || defined(__PPC__) || defined(__MIPS__) |
| _nfree( _nmalloc( 1 ) ); /* get something into the heap */ |
| #else |
| unsigned max_paras; |
| unsigned curr_paras; |
| unsigned diff_paras; |
| unsigned expand; |
| |
| _AccessNHeap(); |
| /* calculate # pages which always has extra slack space (ie. 0x10) */ |
| curr_paras = (( _curbrk + 0x10 ) & ~0x0f ) >> 4; |
| if( curr_paras == 0 ) { |
| /* we're already at 64k */ |
| _ReleaseNHeap(); |
| return; |
| } |
| #if defined(__QNX__) |
| if( qnx_segment_realloc( _DGroup(), 65536L ) == -1 ) { |
| _ReleaseNHeap(); |
| return; |
| } |
| max_paras = PARAS_IN_64K; |
| #elif defined(__OS2__) |
| if( DosReallocSeg( 0, _DGroup() ) ) { |
| _ReleaseNHeap(); |
| return; |
| } |
| max_paras = PARAS_IN_64K; |
| #else |
| if( _osmode != DOS_MODE ) { /* 23-apr-91 */ |
| max_paras = PARAS_IN_64K; |
| } else { |
| max_paras = TinyMaxSet( _psp ); |
| /* subtract off code size */ |
| max_paras -= _DGroup() - _psp; |
| if( max_paras > PARAS_IN_64K ) { |
| max_paras = PARAS_IN_64K; |
| } |
| } |
| #endif |
| if( max_paras <= curr_paras ) { |
| /* '<' -> something is wrong, '==' -> can't change size */ |
| _ReleaseNHeap(); |
| return; |
| } |
| diff_paras = max_paras - curr_paras; |
| expand = (( diff_paras + 1 ) << 4 ) - ( _curbrk & 0x0f ); |
| expand += __LastFree(); /* compensate for _expand's adjustment */ |
| _ReleaseNHeap(); |
| _nfree( _nmalloc( expand - ( sizeof( size_t ) + sizeof(frl) ) ) ); |
| #endif |
| } |