Thread详解3：线程的状态及几个简单方法

Thread详解3：线程的状态及几个简单方法

获得线程的状态的方法
如果是在windows NT下，可以用pdh接口。platform SDK里有pdh.h和pdh.lib，把他们加到项目里来。
下面的代码是我的一个程序的片断：
比如你要查看explorer.exe的第一个线程的状态，可以这样用（当然，你自己要做一些修改）：
[cpp] view plaincopy
void func()  
{  
Initialize();  
LONG rt = GetThreadState(_T("explorer/0"));  
switch(rt)  
{  
case 0: //Initialized, The thread is recognized as an object by the microkernel.  
break;  
case 1: //Ready,The thread is prepared to run on the next free processor.  
break;  
case 2: //Running, The thread is executing.  
break;  
case 3: //Standby, The thread is assigned to a processor and about to run. Only one thread can be in Standby state at a time.  
break;  
case 4: //Terminated, The thread is finished executing.  
break;  
case 5: //Waiting, The thread is not ready for the processor. When it is ready, it will have to be rescheduled.  
break;  
case 6: //Transition, The thread is ready but waiting for resources other than the processor to become available.  
break;  
case 7: //unknown, The thread state is unknown.  
break;  
default:  
break;  
}  
}  
BOOL CPdhWrapper::Initialize()  
{  
typedef long (__stdcall *PDHOpenQuery) (LPCSTR, DWORD_PTR, HQUERY);  
PDHOpenQuery pfnPdhOpenQuery;  
m_hPdhModule = LoadLibrary(_T("PDH.DLL"));  
if(m_hPdhModule == NULL)  
return FALSE;  
// 这个地方ms弄错了，pdh.h里声明的是PdhOpenQueryA，但pdh.dll里导出的却是PdhOpenQuery。  
pfnPdhOpenQuery = (PDHOpenQuery)GetProcAddress(m_hPdhModule, "PdhOpenQuery");  
if(pfnPdhOpenQuery == NULL)  
return FALSE;  
return ERROR_SUCCESS == pfnPdhOpenQuery(NULL, 1, &m_hQuery);  
}  
LONG CPdhWrapper::QueryData(LPCTSTR lpCounterName)  
{  
HCOUNTER hCounter;  
PDH_FMT_COUNTERVALUE pdhFormattedValue;  
if(ERROR_SUCCESS != PdhAddCounter(m_hQuery, lpCounterName, NULL, &hCounter))  
return -1;  
if(ERROR_SUCCESS != PdhCollectQueryData(m_hQuery)  
|| ERROR_SUCCESS != PdhGetFormattedCounterValue(   
hCounter,  
PDH_FMT_LONG,  
NULL,  
&pdhFormattedValue )  
|| ERROR_SUCCESS != pdhFormattedValue.CStatus)  
{  
pdhFormattedValue.longValue = -1;  
}  
PdhRemoveCounter(hCounter);  
return pdhFormattedValue.longValue;  
}  
DWORD CPdhWrapper::GetThreadStat(LPCTSTR szThreadName)  
{  
TCHAR szCounterName[256];  
_stprintf(szCounterName, _T("//Thread(%s)//Thread State"),szThreadName);  
return QueryData(szCounterName);  
}

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