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