Реферат: Блокировки в MS SQL Server 2000

}

int value;

static HANDLE hMutex;

};

__declspec(selectany) HANDLE CObject::hMutex = NULL;

CProxy& CObject::GetObject(int level)

{

HANDLE hLocMutex = CreateMutex(NULL,TRUE,_T("Guard-Lock-Mutex"));

bool flg = GetLastError() == ERROR_ALREADY_EXISTS;

if (flg) WaitForSingleObject(hLocMutex,INFINITE);

else CObject::hMutex = hLocMutex;

static CObject obj;

ReleaseMutex(hLocMutex);

if (flg) CloseHandle(hLocMutex);

return obj.BeginTran(level);

}

void CProxy::Commit()

{

parent->RemoveLocks();

delete this;

}

void CProxy::Rollback()

{

if (fUpd)

parent->value = _value;

parent->RemoveLocks();

delete this;

}

void CProxy::put_Value(int i)