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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.
/*++
Module Name:
include/pal/synchcache.hpp
Abstract:
Simple look-aside cache for unused objects with default
constructor or no constructor
--*/
#ifndef _SYNCH_CACHE_H_
#define _SYNCH_CACHE_H_
#include "pal/thread.hpp"
#include "pal/malloc.hpp"
namespace CorUnix
{
template <typename T> class CSynchCache
{
typedef union _USynchCacheStackNode
{
union _USynchCacheStackNode * next;
BYTE objraw[sizeof(T)];
} USynchCacheStackNode;
static const int MaxDepth = 256;
Volatile<USynchCacheStackNode*> m_pHead;
CRITICAL_SECTION m_cs;
Volatile<int> m_iDepth;
int m_iMaxDepth;
#ifdef _DEBUG
int m_iMaxTrackedDepth;
#endif
void Lock(CPalThread * pthrCurrent)
{ InternalEnterCriticalSection(pthrCurrent, &m_cs); }
void Unlock(CPalThread * pthrCurrent)
{ InternalLeaveCriticalSection(pthrCurrent, &m_cs); }
public:
CSynchCache(int iMaxDepth = MaxDepth) :
m_pHead(NULL),
m_iDepth(0),
m_iMaxDepth(iMaxDepth)
#ifdef _DEBUG
,m_iMaxTrackedDepth(0)
#endif
{
InternalInitializeCriticalSection(&m_cs);
if (m_iMaxDepth < 0)
{
m_iMaxDepth = 0;
}
}
~CSynchCache()
{
Flush(NULL, true);
InternalDeleteCriticalSection(&m_cs);
}
#ifdef _DEBUG
int GetMaxTrackedDepth() { return m_iMaxTrackedDepth; }
#endif
T * Get(CPalThread * pthrCurrent)
{
T * pObj = NULL;
Get(pthrCurrent, 1, &pObj);
return pObj;
}
int Get(CPalThread * pthrCurrent, int n, T ** ppObjs)
{
void * pvObjRaw;
USynchCacheStackNode * pNode;
int i = 0,j;
Lock(pthrCurrent);
pNode = m_pHead;
while (pNode && i < n)
{
ppObjs[i] = (T *)pNode;
pNode = pNode->next;
i++;
}
m_pHead = pNode;
m_iDepth -= i;
#ifdef _DEBUG
if (NULL == m_pHead && m_iDepth != 0)
{
// Can't use ASSERT here, since this is header
// is included by other headers with inline methods
// which causes template instatiation in the header
// where the DEBUG CHANNEL is not defined and cannot
// be defined
fprintf(stderr,"SYNCCACHE: Invalid cache depth value");
DebugBreak();
}
#endif // _DEBUG
Unlock(pthrCurrent);
for (j=i;j<n;j++)
{
pvObjRaw = (void *) InternalNew<USynchCacheStackNode>();
if (NULL == pvObjRaw)
break;
#ifdef _DEBUG
memset(pvObjRaw, 0, sizeof(USynchCacheStackNode));
#endif
ppObjs[j] = reinterpret_cast<T*>(pvObjRaw);
}
for (i=0;i<j;i++)
{
new ((void *)ppObjs[i]) T;
}
return j;
}
void Add(CPalThread * pthrCurrent, T * pobj)
{
USynchCacheStackNode * pNode = reinterpret_cast<USynchCacheStackNode *>(pobj);
if (NULL == pobj)
{
return;
}
pobj->~T();
Lock(pthrCurrent);
if (m_iDepth < m_iMaxDepth)
{
#ifdef _DEBUG
if (m_iDepth > m_iMaxTrackedDepth)
{
m_iMaxTrackedDepth = m_iDepth;
}
#endif
pNode->next = m_pHead;
m_pHead = pNode;
m_iDepth++;
}
else
{
InternalDelete((char *)pNode);
}
Unlock(pthrCurrent);
}
void Flush(CPalThread * pthrCurrent, bool fDontLock = false)
{
USynchCacheStackNode * pNode, * pTemp;
if (!fDontLock)
{
Lock(pthrCurrent);
}
pNode = m_pHead;
m_pHead = NULL;
m_iDepth = 0;
if (!fDontLock)
{
Unlock(pthrCurrent);
}
while (pNode)
{
pTemp = pNode;
pNode = pNode->next;
InternalDelete((char *)pTemp);
}
}
};
template <typename T> class CSHRSynchCache
{
union _USHRSynchCacheStackNode; // fwd declaration
typedef struct _SHRCachePTRs
{
union _USHRSynchCacheStackNode * pNext;
SharedID shrid;
} SHRCachePTRs;
typedef union _USHRSynchCacheStackNode
{
SHRCachePTRs pointers;
BYTE objraw[sizeof(T)];
} USHRSynchCacheStackNode;
static const int MaxDepth = 256;
static const int PreAllocFactor = 10; // Everytime a Get finds no available
// cached raw intances, it preallocates
// MaxDepth/PreAllocFactor new raw
// instances and store them into the
// cache before continuing
Volatile<USHRSynchCacheStackNode*> m_pHead;
CRITICAL_SECTION m_cs;
Volatile<int> m_iDepth;
int m_iMaxDepth;
#ifdef _DEBUG
int m_iMaxTrackedDepth;
#endif
void Lock(CPalThread * pthrCurrent)
{ InternalEnterCriticalSection(pthrCurrent, &m_cs); }
void Unlock(CPalThread * pthrCurrent)
{ InternalLeaveCriticalSection(pthrCurrent, &m_cs); }
public:
CSHRSynchCache(int iMaxDepth = MaxDepth) :
m_pHead(NULL),
m_iDepth(0),
m_iMaxDepth(iMaxDepth)
#ifdef _DEBUG
,m_iMaxTrackedDepth(0)
#endif
{
InternalInitializeCriticalSection(&m_cs);
if (m_iMaxDepth < 0)
{
m_iMaxDepth = 0;
}
}
~CSHRSynchCache()
{
Flush(NULL, true);
InternalDeleteCriticalSection(&m_cs);
}
#ifdef _DEBUG
int GetMaxTrackedDepth() { return m_iMaxTrackedDepth; }
#endif
SharedID Get(CPalThread * pthrCurrent)
{
SharedID shridObj = NULL;
Get(pthrCurrent, 1, &shridObj);
return shridObj;
}
int Get(CPalThread * pthrCurrent, int n, SharedID * shridpObjs)
{
SharedID shridObj;
void * pvObjRaw = NULL;
USHRSynchCacheStackNode * pNode;
int i = 0, j, k;
Lock(pthrCurrent);
pNode = m_pHead;
while (pNode && i < n)
{
shridpObjs[i] = pNode->pointers.shrid;
pvObjRaw = (void *)pNode;
pNode = pNode->pointers.pNext;
i++;
}
m_pHead = pNode;
m_iDepth -= i;
#ifdef _DEBUG
if (NULL == m_pHead && m_iDepth != 0)
{
// Can't use ASSERT here, since this is header
// (see comment above)
fprintf(stderr,"SYNCCACHE: Invalid cache depth value");
DebugBreak();
}
#endif // _DEBUG
if (0 == m_iDepth)
{
for (k=0; k<m_iMaxDepth/PreAllocFactor-n+i; k++)
{
shridObj = malloc(sizeof(USHRSynchCacheStackNode));
if (NULL == shridObj)
{
Flush(pthrCurrent, true);
break;
}
pNode = SharedIDToTypePointer(USHRSynchCacheStackNode, shridObj);
#ifdef _DEBUG
memset(reinterpret_cast<void*>(pNode), 0, sizeof(USHRSynchCacheStackNode));
#endif
pNode->pointers.shrid = shridObj;
pNode->pointers.pNext = m_pHead;
m_pHead = pNode;
m_iDepth++;
}
}
Unlock(pthrCurrent);
for (j=i;j<n;j++)
{
shridObj = malloc(sizeof(USHRSynchCacheStackNode));
if (NULL == shridObj)
break;
#ifdef _DEBUG
pvObjRaw = SharedIDToPointer(shridObj);
memset(pvObjRaw, 0, sizeof(USHRSynchCacheStackNode));
#endif
shridpObjs[j] = shridObj;
}
for (i=0;i<j;i++)
{
pvObjRaw = SharedIDToPointer(shridpObjs[i]);
new (pvObjRaw) T;
}
return j;
}
void Add(CPalThread * pthrCurrent, SharedID shridObj)
{
if (NULL == shridObj)
{
return;
}
USHRSynchCacheStackNode * pNode = SharedIDToTypePointer(USHRSynchCacheStackNode, shridObj);
T * pObj = reinterpret_cast<T *>(pNode);
pObj->~T();
pNode->pointers.shrid = shridObj;
Lock(pthrCurrent);
if (m_iDepth < m_iMaxDepth)
{
m_iDepth++;
#ifdef _DEBUG
if (m_iDepth > m_iMaxTrackedDepth)
{
m_iMaxTrackedDepth = m_iDepth;
}
#endif
pNode->pointers.pNext = m_pHead;
m_pHead = pNode;
}
else
{
free(shridObj);
}
Unlock(pthrCurrent);
}
void Flush(CPalThread * pthrCurrent, bool fDontLock = false)
{
USHRSynchCacheStackNode * pNode, * pTemp;
SharedID shridTemp;
if (!fDontLock)
{
Lock(pthrCurrent);
}
pNode = m_pHead;
m_pHead = NULL;
m_iDepth = 0;
if (!fDontLock)
{
Unlock(pthrCurrent);
}
while (pNode)
{
pTemp = pNode;
pNode = pNode->pointers.pNext;
shridTemp = pTemp->pointers.shrid;
free(shridTemp);
}
}
};
}
#endif // _SYNCH_CACHE_H_
|
