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// Licensed to the .NET Foundation under one or more agreements.
// The .NET Foundation licenses this file to you under the MIT license.
// See the LICENSE file in the project root for more information.
//---------------------------------------------------------------------------
// CCacheLineAllocator
//
//
// @doc
// @module cachelineAlloc.h
//
// This file defines the CacheLine Allocator class.
//
// @comm
//
//
// <nl> Definitions.:
// <nl> Class Name Header file
// <nl> --------------------------- ---------------
// <nl> <c CCacheLineAllocator> BAlloc.h
//
// <nl><nl>
// Notes:
// The CacheLineAllocator maintains a pool of free CacheLines
//
// The CacheLine Allocator provides static member functions
// GetCacheLine and FreeCacheLine,
//
// <nl><nl>
//
//---------------------------------------------------------------------------
#ifndef _H_CACHELINE_ALLOCATOR_
#define _H_CACHELINE_ALLOCATOR_
#include "slist.h"
#include <pshpack1.h>
class CacheLine
{
public:
enum
{
numEntries = 15,
numValidBytes = numEntries * sizeof(void *)
};
// store next pointer and the entries
SLink m_Link;
union
{
void* m_pAddr[numEntries];
BYTE m_xxx[numValidBytes];
};
// init
void Init32()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
// initialize cacheline
memset(&m_Link,0,32);
}
void Init64()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
// initialize cacheline
memset(&m_Link,0,64);
}
CacheLine()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
// initialize cacheline
memset(&m_Link,0,sizeof(CacheLine));
}
};
#include <poppack.h>
typedef CacheLine* LPCacheLine;
/////////////////////////////////////////////////////////
// class CCacheLineAllocator
// Handles Allocation/DeAllocation of cache lines
// used for hash table overflow buckets
///////////////////////////////////////////////////////
class CCacheLineAllocator
{
typedef SList<CacheLine, true> REGISTRYLIST;
typedef SList<CacheLine, true> FREELIST32;
typedef SList<CacheLine, true> FREELIST64;
public:
//constructor
CCacheLineAllocator ();
//destructor
~CCacheLineAllocator ();
// free cacheline blocks
FREELIST32 m_freeList32; //32 byte
FREELIST64 m_freeList64; //64 byte
// registry for virtual free
REGISTRYLIST m_registryList;
void *VAlloc(ULONG cbSize);
void VFree(void* pv);
// GetCacheLine,
void * GetCacheLine32();
// GetCacheLine,
void * GetCacheLine64();
// FreeCacheLine,
void FreeCacheLine32(void *pCacheLine);
// FreeCacheLine,
void FreeCacheLine64(void *pCacheLine);
};
#endif
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