CriticalSection临界区封装类

#pragma once                                            /* 编译一次 */
class CCriticalSection                                  /* 临界区封装类 */
{
public: CCriticalSection( DWORD dwSpinCount = 0 )       /* 使用旋转锁 参考值 4000 不为0 则会创建一个事件内核对象(多线程同时访问这个事件内核对象才有用) */
	{
		m_bInit = FALSE;
		if ( dwSpinCount == 0 )
		{
			InitializeCriticalSection();
		} else
			InitializeCriticalSectionAndSpinCount( dwSpinCount );
	}


	~CCriticalSection()
	{
		DeleteCriticalSection();
	}


	void InitializeCriticalSection()
	{
		if ( m_bInit )
		{
			PRINTFUNDEBUGINFO( "已初始化" );
			return;
		}
		::InitializeCriticalSection( &m_cs );
		m_bInit = TRUE;
	}


	BOOL InitializeCriticalSectionAndSpinCount( DWORD dwSpinCount ) /* 带旋转锁初始化 参考值 4000 如果只有一个cpu处理器 则忽略 dwspincount */
	{
		if ( m_bInit )
		{
			PRINTFUNDEBUGINFO( "已初始化" );
			return(FALSE);
		}
		return(m_bInit = ::InitializeCriticalSectionAndSpinCount( &m_cs, dwSpinCount ) );
	}


	DWORD SetCriticalSectionSpinCount( DWORD dwSpinCount )  /* 改变旋转锁次数 如果是单处理器 同样忽略 dwspincount */
	{
		return(::SetCriticalSectionSpinCount( &m_cs, dwSpinCount ) );
	}


	void EnterCriticalSection()                             /* 进入临界区 */
	{
		::EnterCriticalSection( &m_cs );
	}


	void LeaveCriticalSection()                             /* 离开临界区 */
	{
		::LeaveCriticalSection( &m_cs );
	}


	BOOL TryEnterCriticalSection()                          /* 尝试进入临界区(立即返回) 如果返回值为true 必须对应一个 leavecriticalsection 如果为false 则不可进入 */
	{
		return(::TryEnterCriticalSection( &m_cs ) );
	}


	void DeleteCriticalSection()                            /*删除临界区 */
	{
		if ( !m_bInit )
		{
			PRINTFUNDEBUGINFO( "无对象" );
			return;                                 /* 无对象 */
		}
		m_bInit = FALSE; ::DeleteCriticalSection( &m_cs );
	}


protected: private: BOOL	m_bInit;                        /* 是否已初始化 */
	CRITICAL_SECTION	m_cs;                           /* 私有结构 */
};