100 lines
2.5 KiB
C
100 lines
2.5 KiB
C
|
/*++
|
||
|
|
|
||
|
|
Copyright (c) 1999-2000 Microsoft Corporation
|
||
|
|
|
||
|
|
Module Name:
|
||
|
|
|
||
|
|
fsbpool.h
|
||
|
|
|
||
|
|
Abstract:
|
||
|
|
|
||
|
|
This file contains definitions and function prototypes for manipulating
|
||
|
|
fixed-size block pools.
|
||
|
|
|
||
|
|
Author:
|
||
|
|
|
||
|
|
Shaun Cox (shaunco) 10-Dec-1999
|
||
|
|
|
||
|
|
--*/
|
||
|
|
|
||
|
|
#pragma once
|
||
|
|
|
||
|
|
|
||
|
|
typedef
|
||
|
|
VOID
|
||
|
|
(__stdcall *PFSB_BUILDBLOCK_FUNCTION) (
|
||
|
|
IN PUCHAR Block,
|
||
|
|
IN SIZE_T NumberOfBytes
|
||
|
|
);
|
||
|
|
|
||
|
|
|
||
|
|
// Creates a pool of fixed-size blocks built over non-paged pool. Each
|
||
|
|
// block is BlockSize bytes long. If NULL is not returned,
|
||
|
|
// FsbDestroyPool should be called at a later time to reclaim the
|
||
|
|
// resources used by the pool.
|
||
|
|
//
|
||
|
|
// Arguments:
|
||
|
|
// BlockSize - The size, in bytes, of each block.
|
||
|
|
// FreeBlockLinkOffset - The offset, in bytes, from the beginning of a block
|
||
|
|
// that represenets a pointer-sized storage location that the pool can
|
||
|
|
// use to chain free blocks together. Most often this will be zero
|
||
|
|
// (meaning use the first pointer-size bytes of the block.)
|
||
|
|
// Tag - The pool tag to be used internally for calls to
|
||
|
|
// ExAllocatePoolWithTag. This allows callers to track
|
||
|
|
// memory consumption for different pools.
|
||
|
|
// BuildFunction - An optional pointer to a function which initializes
|
||
|
|
// blocks when they are first allocated by the pool. This allows the
|
||
|
|
// caller to perform custom, on-demand initialization of each block.
|
||
|
|
//
|
||
|
|
// Returns the handle used to identify the pool.
|
||
|
|
//
|
||
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
||
|
|
//
|
||
|
|
HANDLE
|
||
|
|
FsbCreatePool(
|
||
|
|
IN USHORT BlockSize,
|
||
|
|
IN USHORT FreeBlockLinkOffset,
|
||
|
|
IN ULONG Tag,
|
||
|
|
IN PFSB_BUILDBLOCK_FUNCTION BuildFunction OPTIONAL
|
||
|
|
);
|
||
|
|
|
||
|
|
// Destroys a pool of fixed-size blocks previously created by a call to
|
||
|
|
// FsbCreatePool.
|
||
|
|
//
|
||
|
|
// Arguments:
|
||
|
|
// PoolHandle - Handle which identifies the pool being destroyed.
|
||
|
|
//
|
||
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
||
|
|
//
|
||
|
|
VOID
|
||
|
|
FsbDestroyPool(
|
||
|
|
IN HANDLE PoolHandle
|
||
|
|
);
|
||
|
|
|
||
|
|
// Returns a pointer to a block allocated from a pool. NULL is returned if
|
||
|
|
// the request could not be granted. The returned pointer is guaranteed to
|
||
|
|
// have 8 byte alignment.
|
||
|
|
//
|
||
|
|
// Arguments:
|
||
|
|
// PoolHandle - Handle which identifies the pool being allocated from.
|
||
|
|
//
|
||
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
||
|
|
//
|
||
|
|
PUCHAR
|
||
|
|
FsbAllocate(
|
||
|
|
IN HANDLE PoolHandle
|
||
|
|
);
|
||
|
|
|
||
|
|
// Free a block back to the pool from which it was allocated.
|
||
|
|
//
|
||
|
|
// Arguments:
|
||
|
|
// Block - A block returned from a prior call to FsbAllocate.
|
||
|
|
//
|
||
|
|
// Caller IRQL: [PASSIVE_LEVEL, DISPATCH_LEVEL]
|
||
|
|
//
|
||
|
|
VOID
|
||
|
|
FsbFree(
|
||
|
|
IN PUCHAR Block
|
||
|
|
);
|
||
|
|
|