int main() if else return 0; int main() if else return 0; int main() if else return 0; int main() if else return 0; int main() if else return 0; int main() if else return 0; int main() if else return 0; int main() if else return 0;
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/////////////////////////////////////////////////////// // AFXTLS.CPP文件 #include "_AFXTLS_.H" //--------------------------------------- void CSimpleList::AddHead( void * p) { *GetNextPtr(p) = m_pHead; m_pHead = p; } BOOL CSimpleList::Remove( void * p) { if (p == NULL) // 检查参数 return FALSE; BOOL bResult = FALSE; // 假设移除失败 if (p == m_pHead) { // 要移除头元素 m_pHead = *GetNextPtr(p); bResult = TRUE; } else { // 试图在表中查找要移除的元素 void * pTest = m_pHead; while (pTest != NULL && *GetNextPtr(pTest) != p) pTest = *GetNextPtr(pTest); // 如果找到,就将元素移除 if (pTest != NULL) { *GetNextPtr(pTest) = *GetNextPtr(p); bResult = TRUE; } } return bResult; } //-------------------CThreadSlotData类----------------------// BYTE __afxThreadData[ sizeof (CThreadSlotData)]; // 为下面的_afxThreadData变量提供内存 CThreadSlotData* _afxThreadData; // 定义全局变量_afxThreadData来为全局变量分配空间 struct CSlotData { DWORD dwFlags; // 槽的使用标志(被分配/未被分配) HINSTANCE hInst; // 占用此槽的模块句柄 }; struct CThreadData : public CNoTrackObject { CThreadData* pNext; // CSimpleList类要使用此成员 int nCount; // 数组元素的个数 LPVOID * pData; // 数组的首地址 }; #define SLOT_USED 0x01 // CSlotData结构中dwFlags成员的值为0x01时表示该槽已被使用 CThreadSlotData::CThreadSlotData() { m_list.Construct(offsetof(CThreadData, pNext)); // 初始化CTypedSimpleList对象 m_nMax = 0; m_nAlloc = 0; m_nRover = 1; // 我们假定Slot1还未被分配(第一个槽(Slot0)总是保留下来不被使用) m_pSlotData = NULL; m_tlsIndex = ::TlsAlloc(); // 使用系统的TLS申请一个索引 ::InitializeCriticalSection(&m_cs); // 初始化关键段变量 } int CThreadSlotData::AllocSlot() { ::EnterCriticalSection(&m_cs); // 进入临界区(也叫关键段) int nAlloc = m_nAlloc; int nSlot = m_nRover; if (nSlot >= nAlloc || m_pSlotData[nSlot].dwFlags & SLOT_USED) { // 搜索m_pSlotData,查找空槽(SLOT) for (nSlot = 1; nSlot < nAlloc && m_pSlotData[nSlot].dwFlags & SLOT_USED; nSlot ++) ; // 如果不存在空槽,申请更多的空间 if (nSlot >= nAlloc) { // 增加全局数组的大小,分配或再分配内存以创建新槽 int nNewAlloc = nAlloc + 32; HGLOBAL hSlotData; if (m_pSlotData == NULL) // 第一次使用 { hSlotData = ::GlobalAlloc(GMEM_MOVEABLE, nNewAlloc* sizeof (CSlotData)); } else { hSlotData = ::GlobalHandle(m_pSlotData); ::GlobalUnlock(hSlotData); hSlotData = ::GlobalReAlloc(hSlotData, nNewAlloc* sizeof (CSlotData), GMEM_MOVEABLE); } CSlotData* pSlotData = (CSlotData*)::GlobalLock(hSlotData); // 将新申请的空间初始化为0 memset (pSlotData + m_nAlloc, 0, (nNewAlloc - nAlloc)* sizeof (CSlotData)); m_nAlloc = nNewAlloc; m_pSlotData = pSlotData; } } // 调整m_nMax的值,以便为各线程的私有数据分配内存 if (nSlot >= m_nMax) m_nMax = nSlot + 1; m_pSlotData[nSlot].dwFlags |= SLOT_USED; // 更新m_nRover的值(我们假设下一个槽未被使用) m_nRover = nSlot + 1; ::LeaveCriticalSection(&m_cs); return nSlot; // 返回的槽号可以被FreeSlot, GetThreadValue, SetValue函数使用了 } void CThreadSlotData::FreeSlot( int nSlot) { ::EnterCriticalSection(&m_cs); // 删除所有线程中的数据 CThreadData* pData = m_list; while (pData != NULL) { if (nSlot < pData->nCount) { delete (CNoTrackObject*)pData->pData[nSlot]; pData->pData[nSlot] = NULL; } pData = pData->pNext; } // 将此槽号标识为未被使用 m_pSlotData[nSlot].dwFlags &= ~SLOT_USED; ::LeaveCriticalSection(&m_cs); } inline void * CThreadSlotData::GetThreadValue( int nSlot) { CThreadData* pData = (CThreadData*)::TlsGetValue(m_tlsIndex); if (pData == NULL || nSlot >= pData->nCount) return NULL; return pData->pData[nSlot]; } void CThreadSlotData::SetValue( int nSlot, void * pValue) { // 通过TLS索引得到我们为线程安排的私有存储空间 CThreadData* pData = (CThreadData*)::TlsGetValue(m_tlsIndex); // 为线程私有数据申请内存空间 if ((pData == NULL || nSlot >= pData->nCount) && pValue != NULL) { // pData的值为空,表示该线程第一次访问线程私有数据 if (pData == NULL) { pData = new CThreadData; pData->nCount = 0; pData->pData = NULL; // 将新申请的内存的地址添加到全局列表中 ::EnterCriticalSection(&m_cs); m_list.AddHead(pData); ::LeaveCriticalSection(&m_cs); } // pData->pData指向真正的线程私有数据,下面的代码将私有数据占用的空间增长到m_nMax指定的大小 if (pData->pData == NULL) pData->pData = ( void **)::GlobalAlloc(LMEM_FIXED, m_nMax* sizeof ( LPVOID )); else pData->pData = ( void **)::GlobalReAlloc(pData->pData, m_nMax* sizeof ( LPVOID ), LMEM_MOVEABLE); // 将新申请的内存初始话为0 memset (pData->pData + pData->nCount, 0, (m_nMax - pData->nCount) * sizeof ( LPVOID )); pData->nCount = m_nMax; ::TlsSetValue(m_tlsIndex, pData); } // 设置线程私有数据的值 pData->pData[nSlot] = pValue; } void CThreadSlotData::DeleteValues( HINSTANCE hInst, BOOL bAll) { ::EnterCriticalSection(&m_cs); if (!bAll) { // 仅仅删除当前线程的线程局部存储占用的空间 CThreadData* pData = (CThreadData*)::TlsGetValue(m_tlsIndex); if (pData != NULL) DeleteValues(pData, hInst); } else { // 删除所有线程的线程局部存储占用的空间 CThreadData* pData = m_list.GetHead(); while (pData != NULL) { CThreadData* pNextData = pData->pNext; DeleteValues(pData, hInst); pData = pNextData; } } ::LeaveCriticalSection(&m_cs); } void CThreadSlotData::DeleteValues(CThreadData* pData, HINSTANCE hInst) { // 释放表中的每一个元素 BOOL bDelete = TRUE; for ( int i=1; i<pData->nCount; i++) { if (hInst == NULL || m_pSlotData[i].hInst == hInst) { // hInst匹配,删除数据 delete (CNoTrackObject*)pData->pData[i]; pData->pData[i] = NULL; } else { // 还有其它模块在使用,不要删除数据 if (pData->pData[i] != NULL) bDelete = FALSE; } } if (bDelete) { // 从列表中移除 ::EnterCriticalSection(&m_cs); m_list.Remove(pData); ::LeaveCriticalSection(&m_cs); ::LocalFree(pData->pData); delete pData; // 清除TLS索引,防止重用 ::TlsSetValue(m_tlsIndex, NULL); } } CThreadSlotData::~CThreadSlotData() { CThreadData *pData = m_list; while (pData != NULL) { CThreadData* pDataNext = pData->pNext; DeleteValues(pData, NULL); pData = pData->pNext; } if (m_tlsIndex != ( DWORD )-1) ::TlsFree(m_tlsIndex); if (m_pSlotData != NULL) { HGLOBAL hSlotData = ::GlobalHandle(m_pSlotData); ::GlobalUnlock(hSlotData); ::GlobalFree(m_pSlotData); } ::DeleteCriticalSection(&m_cs); } //--------------------------------------- void * CNoTrackObject::operator new ( size_t nSize) { // 申请一块带有GMEM_FIXED和GMEM_ZEROINIT标志的内存 void * p = ::GlobalAlloc(GPTR, nSize); return p; } void CNoTrackObject::operator delete ( void * p) { if (p != NULL) ::GlobalFree(p); } //----------------------------CThreadLocalObject 类--------------------------------// CNoTrackObject* CThreadLocalObject::GetData(CNoTrackObject* (*pfnCreateObject)()) { if (m_nSlot == 0) { if (_afxThreadData == NULL) _afxThreadData = new (__afxThreadData) CThreadSlotData; m_nSlot = _afxThreadData->AllocSlot(); } CNoTrackObject* pValue = (CNoTrackObject*)_afxThreadData->GetThreadValue(m_nSlot); if (pValue == NULL) { // 创建一个数据项 pValue = (*pfnCreateObject)(); // 使用线程私有数据保存新创建的对象 _afxThreadData->SetValue(m_nSlot, pValue); } return pValue; } CNoTrackObject* CThreadLocalObject::GetDataNA() { if (m_nSlot == 0 || _afxThreadData == 0) return NULL; return (CNoTrackObject*)_afxThreadData->GetThreadValue(m_nSlot); } CThreadLocalObject::~CThreadLocalObject() { if (m_nSlot != 0 && _afxThreadData != NULL) _afxThreadData->FreeSlot(m_nSlot); m_nSlot = 0; } //------------------------------------------ |