105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
//+---------------------------------------------------------------------------
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//
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// Microsoft Windows
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// Copyright (C) Microsoft Corporation, 1992 - 1992.
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//
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// File: freelist.cxx
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//
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// Contents: CFreeList implementation
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//
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// History: 05-Nov-92 DrewB Created
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//
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//----------------------------------------------------------------------------
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#include <dfhead.cxx>
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#pragma hdrstop
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#include <freelist.hxx>
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//+---------------------------------------------------------------------------
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//
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// Member: CFreeList::Reserve, public
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//
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// Synopsis: Allocates memory for a given number of blocks
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//
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// Arguments: [pMalloc] - Allocator to use to allocate blocks
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// [cBlocks] - Number of blocks to allocate
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// [cbBlock] - Block size
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//
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// Returns: Appropriate status code
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//
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// History: 05-Nov-92 DrewB Created
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// 21-May-93 AlexT Add allocator
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CFreeList_Reserve)
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#endif
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SCODE CFreeList::Reserve(IMalloc *pMalloc, UINT cBlocks, size_t cbBlock)
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{
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SFreeBlock *pfb;
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UINT i;
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SCODE sc;
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olDebugOut((DEB_ITRACE, "In CFreeList::Reserve:%p(%lu, %u)\n",
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this, cBlocks, cbBlock));
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olAssert(cbBlock >= sizeof(SFreeBlock));
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for (i = 0; i<cBlocks; i++)
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{
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olMem(pfb = (SFreeBlock *)
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CMallocBased::operator new (cbBlock, pMalloc));
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pfb->pfbNext = _pfbHead;
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_pfbHead = P_TO_BP(CBasedFreeBlockPtr, pfb);
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}
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olDebugOut((DEB_ITRACE, "Out CFreeList::Reserve\n"));
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return S_OK;
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EH_Err:
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SFreeBlock *pfbT;
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for (; i>0; i--)
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{
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olAssert(_pfbHead != NULL);
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pfbT = BP_TO_P(SFreeBlock *, _pfbHead->pfbNext);
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delete (CMallocBased *) BP_TO_P(SFreeBlock *, _pfbHead);
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_pfbHead = P_TO_BP(CBasedFreeBlockPtr, pfbT);
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}
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return sc;
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}
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//+---------------------------------------------------------------------------
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//
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// Member: CFreeList::Unreserve, public
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//
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// Synopsis: Removes N blocks from the list
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//
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// Arguments: [cBlocks] - Number of blocks to free
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//
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// History: 05-Nov-92 DrewB Created
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// 21-May-93 AlexT Switch to CMallocBased
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//
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//----------------------------------------------------------------------------
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#ifdef CODESEGMENTS
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#pragma code_seg(SEG_CFreeList_Unreserve)
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#endif
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void CFreeList::Unreserve(UINT cBlocks)
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{
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SFreeBlock *pfbT;
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olDebugOut((DEB_ITRACE, "In CFreeList::Unreserve:%p(%lu)\n",
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this, cBlocks));
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for (; cBlocks>0; cBlocks--)
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{
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olAssert(_pfbHead != NULL);
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pfbT = BP_TO_P(SFreeBlock *, _pfbHead->pfbNext);
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delete (CMallocBased *) BP_TO_P(SFreeBlock *, _pfbHead);
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_pfbHead = P_TO_BP(CBasedFreeBlockPtr, pfbT);
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}
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olDebugOut((DEB_ITRACE, "Out CFreeList::Unreserve\n"));
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}
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