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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
//
//
// This file dImplements the CCacheLineAllocator class.
//
// @comm
//
// Notes:
// The CacheLineAllocator maintains a pool of free CacheLines
//
// The CacheLine Allocator provides static member functions
// GetCacheLine and FreeCacheLine,
//---------------------------------------------------------------------------
#include "common.h"
#include <stddef.h>
#include "cachelinealloc.h"
#include "threads.h"
#include "excep.h"
///////////////////////////////////////////////////////
// CCacheLineAllocator::CCacheLineAllocator()
//
//////////////////////////////////////////////////////
CCacheLineAllocator::CCacheLineAllocator()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
m_freeList32.Init();
m_freeList64.Init();
m_registryList.Init();
}
///////////////////////////////////////////////////////
// void CCacheLineAllocator::~CCacheLineAllocator()
//
//////////////////////////////////////////////////////
CCacheLineAllocator::~CCacheLineAllocator()
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
}
CONTRACTL_END;
LPCacheLine tempPtr = NULL;
while((tempPtr = m_registryList.RemoveHead()) != NULL)
{
for (int i =0; i < CacheLine::numEntries; i++)
{
if(tempPtr->m_pAddr[i] != NULL)
{
if (!g_fProcessDetach)
VFree(tempPtr->m_pAddr[i]);
}
}
delete tempPtr;
}
}
///////////////////////////////////////////////////////
// static void *CCacheLineAllocator::VAlloc(ULONG cbSize)
//
//////////////////////////////////////////////////////
void *CCacheLineAllocator::VAlloc(ULONG cbSize)
{
CONTRACT(void*)
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
INJECT_FAULT(CONTRACT_RETURN NULL);
POSTCONDITION(CheckPointer(RETVAL, NULL_OK));
}
CONTRACT_END;
// helper to call virtual free to release memory
int i =0;
void* pv = ClrVirtualAlloc (NULL, cbSize, MEM_RESERVE | MEM_COMMIT, PAGE_READWRITE);
if (pv != NULL)
{
LPCacheLine tempPtr = m_registryList.GetHead();
if (tempPtr == NULL)
{
goto LNew;
}
for (i =0; i < CacheLine::numEntries; i++)
{
if(tempPtr->m_pAddr[i] == NULL)
{
tempPtr->m_pAddr[i] = pv;
RETURN pv;
}
}
LNew:
// initialize the bucket before returning
tempPtr = new (nothrow) CacheLine();
if (tempPtr != NULL)
{
tempPtr->Init64();
tempPtr->m_pAddr[0] = pv;
m_registryList.InsertHead(tempPtr);
}
else
{
// couldn't find space to register this page
ClrVirtualFree(pv, 0, MEM_RELEASE);
RETURN NULL;
}
}
RETURN pv;
}
///////////////////////////////////////////////////////
// void CCacheLineAllocator::VFree(void* pv)
//
//////////////////////////////////////////////////////
void CCacheLineAllocator::VFree(void* pv)
{
BOOL bRes = FALSE;
CONTRACT_VOID
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(CheckPointer(pv));
POSTCONDITION(bRes);
}
CONTRACT_END;
// helper to call virtual free to release memory
bRes = ClrVirtualFree (pv, 0, MEM_RELEASE);
RETURN_VOID;
}
///////////////////////////////////////////////////////
// void *CCacheLineAllocator::GetCacheLine()
//
//////////////////////////////////////////////////////
//WARNING: must have a lock when calling this function
void *CCacheLineAllocator::GetCacheLine64()
{
CONTRACT(void*)
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
INJECT_FAULT(CONTRACT_RETURN NULL);
POSTCONDITION(CheckPointer(RETVAL, NULL_OK));
}
CONTRACT_END;
LPCacheLine tempPtr = m_freeList64.RemoveHead();
if (tempPtr != NULL)
{
// initialize the bucket before returning
tempPtr->Init64();
RETURN tempPtr;
}
#define AllocSize 4096*16
////////////////////////////////'
/// Virtual Allocation for some more cache lines
BYTE* ptr = (BYTE*)VAlloc(AllocSize);
if(!ptr)
RETURN NULL;
tempPtr = (LPCacheLine)ptr;
// Link all the buckets
tempPtr = tempPtr+1;
LPCacheLine maxPtr = (LPCacheLine)(ptr + AllocSize);
while(tempPtr < maxPtr)
{
m_freeList64.InsertHead(tempPtr);
tempPtr++;
}
// return the first block
tempPtr = (LPCacheLine)ptr;
tempPtr->Init64();
RETURN tempPtr;
}
///////////////////////////////////////////////////////
// void *CCacheLineAllocator::GetCacheLine32()
//
//////////////////////////////////////////////////////
//WARNING: must have a lock when calling this function
void *CCacheLineAllocator::GetCacheLine32()
{
CONTRACT(void*)
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
INJECT_FAULT(CONTRACT_RETURN NULL);
POSTCONDITION(CheckPointer(RETVAL, NULL_OK));
}
CONTRACT_END;
LPCacheLine tempPtr = m_freeList32.RemoveHead();
if (tempPtr != NULL)
{
// initialize the bucket before returning
tempPtr->Init32();
RETURN tempPtr;
}
tempPtr = (LPCacheLine)GetCacheLine64();
if (tempPtr != NULL)
{
m_freeList32.InsertHead(tempPtr);
tempPtr = (LPCacheLine)((BYTE *)tempPtr+32);
}
RETURN tempPtr;
}
///////////////////////////////////////////////////////
// void CCacheLineAllocator::FreeCacheLine64(void * tempPtr)
//
//////////////////////////////////////////////////////
//WARNING: must have a lock when calling this function
void CCacheLineAllocator::FreeCacheLine64(void * tempPtr)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(CheckPointer(tempPtr));
}
CONTRACTL_END;
LPCacheLine pCLine = (LPCacheLine )tempPtr;
m_freeList64.InsertHead(pCLine);
}
///////////////////////////////////////////////////////
// void CCacheLineAllocator::FreeCacheLine32(void * tempPtr)
//
//////////////////////////////////////////////////////
//WARNING: must have a lock when calling this function
void CCacheLineAllocator::FreeCacheLine32(void * tempPtr)
{
CONTRACTL
{
NOTHROW;
GC_NOTRIGGER;
MODE_ANY;
PRECONDITION(CheckPointer(tempPtr));
}
CONTRACTL_END;
LPCacheLine pCLine = (LPCacheLine )tempPtr;
m_freeList32.InsertHead(pCLine);
}
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