CacheAllocator Class Reference

CacheAllocator defines an interface for allocating memory pages to be used by the cache. More...

#include <CacheAllocator.h>

Inheritance diagram for CacheAllocator:

List of all members.

Public Member Functions
virtual	~CacheAllocator ()
virtual void *	allocate (int *pErrorCode=NULL)=0
	Allocates a chunk of memory of size determined by the constructor.
virtual int	deallocate (void *pMem, int *pErrorCode=NULL)=0
	Deallocates a chunk of memory.
virtual size_t	getBytesAllocated () const=0
	Returns: number of bytes currently allocated
virtual int	setProtection (void *pMem, uint cb, bool readOnly, int *pErrorCode=NULL)=0
	Changes protection state for a contiguous range of virtual memory.

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Detailed Description

CacheAllocator defines an interface for allocating memory pages to be used by the cache.

Definition at line 33 of file CacheAllocator.h.

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Constructor & Destructor Documentation

CacheAllocator::~CacheAllocator

(

)

[virtual]

Definition at line 29 of file CacheAllocator.cpp.

{
}

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Member Function Documentation

virtual void* CacheAllocator::allocate

(

int *

pErrorCode = NULL

)

[pure virtual]

Allocates a chunk of memory of size determined by the constructor.

Parameters:

pErrorCode

on error and if non-NULL, the int referenced is modified to contain the OS error code

Returns:

the allocated chunk; NULL if memory cannot be allocated (see pErrorCode for OS error code)

Implemented in VMAllocator.

Referenced by CacheImpl< PageT, VictimPolicyT >::allocatePages(), and CacheImpl< PageT, VictimPolicyT >::setAllocatedPageCount().

virtual int CacheAllocator::deallocate	(	void *	pMem,
		int *	pErrorCode = NULL
	)			[pure virtual]

Deallocates a chunk of memory.

Parameters:

	pMem	the allocated memory
	pErrorCode	on error and if non-NULL, the int referenced is modified to contain the OS error code

Returns:

0 on success; -1 if memory cannot be deallocated (see pErrorCode for OS error code)

Implemented in VMAllocator.

Referenced by CacheImpl< PageT, VictimPolicyT >::allocatePages(), CacheImpl< PageT, VictimPolicyT >::closeImpl(), and CacheImpl< PageT, VictimPolicyT >::setAllocatedPageCount().

virtual size_t CacheAllocator::getBytesAllocated

(

)

const [pure virtual]

Returns:

number of bytes currently allocated

Implemented in VMAllocator.

virtual int CacheAllocator::setProtection	(	void *	pMem,
		uint	cb,
		bool	readOnly,
		int *	pErrorCode = NULL
	)			[pure virtual]

Changes protection state for a contiguous range of virtual memory.

Parameters:

	pMem	start of range
	cb	number of bytes in range
	readOnly	true for read-only; false for read-write (TODO jvs 7-Feb-2006: support no-access as well)
	pErrorCode	on error and if non-NULL, the int referenced is modified to contain the OS error code

Returns:

0 on success; -1 if an error occurs while manupulating memory protections (see pErrorCode for OS error code)

Implemented in VMAllocator.

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The documentation for this class was generated from the following files:

• /home/pub/open/dev/fennel/cache/CacheAllocator.h
• /home/pub/open/dev/fennel/cache/CacheAllocator.cpp

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