70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
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/*++
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Copyright (c) 1997 Microsoft Corporation
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Module Name:
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BUFMGR.H
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Abstract:
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Buffer Descriptor and Memory Manager for ARPD
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Author:
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Aaron Ogus (aarono)
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Environment:
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Win32/COM
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Revision History:
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Date Author Description
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======= ====== ============================================================
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1/13/97 aarono Original
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--*/
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#ifndef _BUFMGR_H_
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#define _BUFMGR_H_
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#include "buffer.h"
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#include "bufpool.h"
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typedef struct _DoubleBuffer{
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union {
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BUFFER Buffer;
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struct {
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struct _DoubleBuffer *pNext;
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PVOID PAD;
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PCHAR pData;
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UINT len; // length of data area used
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DWORD dwFlags; // Packet flags, ownership and type of packet.
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};
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};
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UINT totlen; // total length of data area
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UINT tLastUsed; // last tick count this was used
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CHAR data[1]; // variable length data
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} DOUBLEBUFFER, *PDOUBLEBUFFER;
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VOID InitBufferManager(VOID);
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VOID FiniBuffermanager(VOID);
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PBUFFER GetDoubleBufferAndCopy(PMEMDESC, UINT);
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VOID FreeDoubleBuffer(PBUFFER);
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PBUFFER BuildBufferChain(PMEMDESC, UINT);
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VOID FreeBufferChainAndMemory(PBUFFER); //works for either type
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UINT BufferChainTotalSize(PBUFFER);
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#define GBF_ALLOC_MEM 0x00000001
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// Don't pool more than 64K per channel.
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#define MAX_CHANNEL_DATA 65536
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// Don't hold more than 3 free buffers per channel.
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#define MAX_CHANNEL_BUFFERS 3
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#endif
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