Source code of Windows XP (NT5)
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/*++
Copyright (c) 1997 Microsoft Corporation
Module Name:
BUFMGR.H
Abstract:
Buffer Descriptor and Memory Manager for ARPD
Author:
Aaron Ogus (aarono)
Environment:
Win32/COM
Revision History:
Date Author Description ======= ====== ============================================================ 1/13/97 aarono Original
--*/
#ifndef _BUFMGR_H_
#define _BUFMGR_H_
#include "buffer.h"
#include "bufpool.h"
typedef struct _DoubleBuffer{ union { BUFFER Buffer; struct { struct _DoubleBuffer *pNext; PVOID PAD; PCHAR pData; UINT len; // length of data area used
DWORD dwFlags; // Packet flags, ownership and type of packet.
}; }; UINT totlen; // total length of data area
UINT tLastUsed; // last tick count this was used
CHAR data[1]; // variable length data
} DOUBLEBUFFER, *PDOUBLEBUFFER;
VOID InitBufferManager(VOID);VOID FiniBuffermanager(VOID);
PBUFFER GetDoubleBufferAndCopy(PMEMDESC, UINT);VOID FreeDoubleBuffer(PBUFFER);PBUFFER BuildBufferChain(PMEMDESC, UINT);
VOID FreeBufferChainAndMemory(PBUFFER); //works for either type
UINT BufferChainTotalSize(PBUFFER);
#define GBF_ALLOC_MEM 0x00000001
// Don't pool more than 64K per channel.
#define MAX_CHANNEL_DATA 65536
// Don't hold more than 3 free buffers per channel.
#define MAX_CHANNEL_BUFFERS 3
#endif
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