114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
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/*++
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Copyright (c) 1992 Microsoft Corporation
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Module Name:
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blkpool.h
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Abstract:
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This module contains routines to manage block pools.
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Author:
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Jameel Hyder (jameelh@microsoft.com)
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Nikhil Kamkolkar (nikhilk@microsoft.com)
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Revision History:
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19 Jun 1992 Initial Version
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Notes: Tab stop: 4
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--*/
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#ifndef _BLK_POOL
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#define _BLK_POOL
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#define SM_BLK 1024
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#define LG_BLK 2048
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#define XL_BLK 4096
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#define BC_SIGNATURE *(PULONG)"BLKC"
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#if DBG
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#define VALID_BC(pChunk) (((pChunk) != NULL) && \
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((pChunk)->bc_Signature == BC_SIGNATURE))
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#else
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#define VALID_BC(pChunk) ((pChunk) != NULL)
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#endif
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typedef struct _BLK_CHUNK
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{
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#if DBG
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DWORD bc_Signature;
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#endif
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struct _BLK_CHUNK * bc_Next; // Pointer to next in the link
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struct _BLK_CHUNK **bc_Prev; // Pointer to previous one
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UCHAR bc_NumFree; // Number of free blocks in the chunk
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UCHAR bc_NumAlloc; // Number of blocks used (DBG only)
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UCHAR bc_Age; // Number of invocations since the chunk free
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BLKID bc_BlkId; // Id of the block
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struct _BLK_HDR * bc_FreeHead; // Head of the list of free blocks
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// This is followed by an array of N blks of size M such that the block header
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// is exactly atalkChunkSize[i]
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} BLK_CHUNK, *PBLK_CHUNK;
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#define BH_SIGNATURE *(PULONG)"BLKH"
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#if DBG
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#define VALID_BH(pBlkHdr) (((pBlkHdr) != NULL) && \
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((pBlkHdr)->bh_Signature == BH_SIGNATURE))
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#else
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#define VALID_BH(pBlkHdr) ((pBlkHdr) != NULL)
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#endif
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typedef struct _BLK_HDR
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{
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#if DBG
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DWORD bh_Signature;
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#endif
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union
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{
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struct _BLK_HDR * bh_Next; // Valid when it is free
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struct _BLK_CHUNK * bh_pChunk; // The parent chunk to which this blocks belong
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// valid when it is allocated
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};
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} BLK_HDR, *PBLK_HDR;
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#if DBG
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#define BC_OVERHEAD (8+4) // DWORD for AtalkAllocMemory() header and
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// POOL_HEADER for ExAllocatePool() header
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#else
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#define BC_OVERHEAD (8+8) // 2*DWORD for AtalkAllocMemory() header and
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// POOL_HEADER for ExAllocatePool() header
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#endif
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#define BLOCK_SIZE(VirginSize) DWORDSIZEBLOCK(sizeof(BLK_HDR)+VirginSize)
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#define NUM_BLOCKS(VirginSize, ChunkSize) \
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((ChunkSize) - BC_OVERHEAD - sizeof(BLK_CHUNK))/BLOCK_SIZE(VirginSize)
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extern USHORT atalkBlkSize[NUM_BLKIDS];
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extern USHORT atalkChunkSize[NUM_BLKIDS];
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extern BYTE atalkNumBlks[NUM_BLKIDS];
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extern ATALK_SPIN_LOCK atalkBPLock[NUM_BLKIDS];
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#define BLOCK_POOL_TIMER 150 // Check interval - in 100ms units
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#define MAX_BLOCK_POOL_AGE 6 // # of timer invocations before free
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extern PBLK_CHUNK atalkBPHead[NUM_BLKIDS];
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extern TIMERLIST atalkBPTimer;
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#if DBG
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extern LONG atalkNumChunksForId[NUM_BLKIDS];
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extern LONG atalkBlksForId[NUM_BLKIDS];
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#endif
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LOCAL LONG FASTCALL
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atalkBPAgePool(
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IN PTIMERLIST Context,
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IN BOOLEAN TimerShuttingDown
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);
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#endif // _BLK_POOL
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