#include "stdafx.h"
#include "IndexAlloc.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif


CIndexAlloc::CIndexAlloc()
{
	m_lpIndexs = NULL;
	m_nIndexNum = 0;
}

CIndexAlloc::~CIndexAlloc()
{
	if(m_lpIndexs)
		delete [] m_lpIndexs;
	m_lpIndexs = NULL;
}

/************************************************************************/
/*
函数:Initialize
描述:初始化
参数:
	IN CONST DWORD dwMaxNum			最大索引个数
返回:TRUE=成功，FALSE=失败
*/
/************************************************************************/
BOOL CIndexAlloc::Initialize(IN CONST int dwMaxNum)
{
	if(dwMaxNum <= 0)
		return FALSE;

	m_nIndexNum = dwMaxNum;
	m_lpIndexs = new SINDEX[dwMaxNum];
	for(int i = 0; i<dwMaxNum; i++)
		m_lpIndexs[i].m_nIdx = i;
	return TRUE;
}

/************************************************************************/
/*
函数:AllocIndex
描述:分配可用的索引
参数:
返回:索引值
*/
/************************************************************************/
int CIndexAlloc::AllocIndex()
{
	CAutoLock autolock(&m_lock);
	int dwIdx = -1;
	for(int i=0; i<m_nIndexNum; i++)
	{
		if(m_lpIndexs[i].m_bUsed == FALSE)
		{
			dwIdx = m_lpIndexs[i].m_nIdx;
			m_lpIndexs[i].m_bUsed = TRUE;
			break;
		}
	}
	return dwIdx;
}

/************************************************************************/
/*
函数:AllocIndex
描述:释放一个索引
参数:
返回:索引值
*/
/************************************************************************/
void CIndexAlloc::FreeIndex(IN CONST int dwIndex)
{
	if(dwIndex < 0)
		return;

	CAutoLock autolock(&m_lock);
	m_lpIndexs[dwIndex].m_bUsed = FALSE;
}