168 lines
4.5 KiB
C
168 lines
4.5 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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iopool.h
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Abstract:
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This module contains the IO pool management stuff.
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Author:
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Jameel Hyder (microsoft!jameelh)
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Revision History:
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25 Feb 1994 Initial Version
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Notes: Tab stop: 4
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--*/
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#ifndef _IOPOOL_
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#define _IOPOOL_
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#define DWORDSIZEBLOCK(Size) (((Size) + sizeof(DWORD) - 1) & ~(sizeof(DWORD)-1))
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#define LONGLONGSIZEBLOCK(Size) ((Size) + (sizeof(LONGLONG) - (Size)%(sizeof(LONGLONG))))
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#define PAGED_BLOCK_SIGNATURE *(PDWORD)"PAGD"
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#define NONPAGED_BLOCK_SIGNATURE *(PDWORD)"NPGD"
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/* MSKK hideyukn, Our Nls table is larger than 0x20000, 07/05/95 */
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// used for debug builds only: bumped up to 0x200000 (note one more 0)
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#define MAXIMUM_ALLOC_SIZE 0x200000 // For sanity checking
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typedef struct
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{
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unsigned tg_Size:20;
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unsigned tg_Flags:4;
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unsigned tg_Tag:8;
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} TAG, *PTAG;
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#define MAX_POOL_AGE 6
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#define POOL_AGE_TIME 15
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#define POOL_ALLOC_SIZE (0x2000) - POOL_OVERHEAD
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#define NUM_BUFS_IN_POOL 3
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#define POOL_ALLOC_3 ASP_QUANTUM
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#define POOL_ALLOC_2 1600
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#define POOL_ALLOC_1 512
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#define LOCKS_BUF_SPACE (POOL_ALLOC_SIZE - sizeof(IOPOOL) - \
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POOL_ALLOC_1 - POOL_ALLOC_2 - POOL_ALLOC_3 - \
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(NUM_BUFS_IN_POOL * sizeof(IOPOOL_HDR)))
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#define IO_POOL_NOT_IN_USE 0
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#define IO_POOL_IN_USE 1
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#define IO_POOL_HUGE_BUFFER 2
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#define NUM_LOCKS_IN_POOL ((LOCKS_BUF_SPACE)/(sizeof(IOPOOL_HDR) + sizeof(FORKLOCK)))
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// The pool is structured as a set of 1 each of POOL_ALLOC_x buffers linked in
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// ascending order of sizes. The balance of the POOL_ALLOC_SIZE is divided into
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// a number of fork-lock structures. The layout is as follows:
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//
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// +---------------------+
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// | IoPool Structure |----------+
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// | |--+ |
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// +---------------------+ | |
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// +--| IoPool Hdr |<-+ |
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// | +---------------------+ |
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// | | | |
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// | . Buffer 1 . |
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// | | | |
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// | +---------------------+ |
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// +->| IoPool Hdr |--+ |
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// +---------------------+ | |
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// | | | |
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// . Buffer 2 . | |
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// | | | |
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// +---------------------+ | |
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// |||--| IoPool Hdr |<-+ |
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// +---------------------+ |
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// | | |
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// . Buffer 3 . |
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// | | |
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// +---------------------+ |
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// +--| IoPool Hdr |<---------+
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// | +---------------------+
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// | | |
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// . . ForkLock1 .
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// . | |
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// | +---------------------+
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// +->| IoPool Hdr |--|||
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// +---------------------+
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// | |
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// . ForkLockN .
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// | |
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// +---------------------+
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//
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//
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#if DBG
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#define POOLHDR_SIGNATURE *(PDWORD)"PLH"
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#define VALID_PLH(pPoolHdr) (((pPoolHdr) != NULL) && \
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((pPoolHdr)->Signature == POOLHDR_SIGNATURE))
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#else
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#define VALID_PLH(pPoolHdr) ((pPoolHdr) != NULL)
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#endif
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typedef struct _IoPoolHdr
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{
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#if DBG
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DWORD Signature;
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DWORD IoPoolHdr_Align1;
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#endif
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union
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{
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struct _IoPoolHdr * iph_Next; // Valid when it is on the free list
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struct _IoPool * iph_pPool; // Valid when it is allocated. Used
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// to put it back on the free list
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};
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DWORD IoPoolHdr_Align2;
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TAG iph_Tag; // Keep it at end since it is accessed
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// by moving back from the free ptr
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} IOPOOL_HDR, *PIOPOOL_HDR;
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#if DBG
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#define IOPOOL_SIGNATURE *(PDWORD)"IOP"
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#define VALID_IOP(pPool) (((pPool) != NULL) && \
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((pPool)->Signature == IOPOOL_SIGNATURE))
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#else
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#define VALID_IOP(pPool) ((pPool) != NULL)
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#endif
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typedef struct _IoPool
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{
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#if DBG
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DWORD Signature;
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DWORD QuadAlign1;
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#endif
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struct _IoPool * iop_Next;
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struct _IoPool ** iop_Prev;
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struct _IoPoolHdr * iop_FreeBufHead; // The list of POOL headers start here
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struct _IoPoolHdr * iop_FreeLockHead; // The list of fork-locks start here
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DWORD QuadAlign2;
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USHORT iop_Age; // Used to age out pool
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BYTE iop_NumFreeBufs; // Number of free IO buffer
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BYTE iop_NumFreeLocks; // Number of free fork locks
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} IOPOOL, *PIOPOOL;
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LOCAL PIOPOOL afpIoPoolHead = { NULL };
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LOCAL AFP_SPIN_LOCK afpIoPoolLock = { 0 };
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LOCAL USHORT afpPoolAllocSizes[NUM_BUFS_IN_POOL] =
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{
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POOL_ALLOC_1,
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POOL_ALLOC_2,
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POOL_ALLOC_3
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};
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LOCAL AFPSTATUS FASTCALL
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afpIoPoolAge(
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IN PVOID pContext
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);
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#endif // _IOPOOL_
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