GetCurrentThreadId返回不同的threadId

Question

我称之为提到的Windows API.但它返回的是与返回的id不同的线程ID _beginthreadex.我的代码如下,

ThreadTest *_threadTest = new ThreadTest();
Thread *_thread = new Thread(StartRoutineForThread,_threadTest);

Thread类的构造函数是,

ThreadWin::ThreadWin(void * (*_startRoutine)(void *), void * _argument, bool _isJoinable)
{
        unsigned int _threadAddress;
        unsigned int threadID = _beginthreadex(
                                    NULL,
                                    0,
                                    (unsigned int (__stdcall *)(void *))_startRoutine,
                                    _argument,
                                    0,
                                    &_threadAddress
                                );
}

StartRoutineForThread 作为线程的启动例程的函数如下,

void* StartRoutineForThread(void* _argument)
{
    ThreadTest *_threadTest = (ThreadTest*)_argument;
    _threadTest->Run();
    return NULL;
}
void ThreadTest::Run()
{
    this->threadID = ::GetCurrentThreadId();    
}

现在在类的构造函数中Thread,变量threadID的值不同于我从函数得到的类ThreadTest变量threadID的Run值.但是这个Run函数是从我创建线程时指定的函数调用的.所以该Run函数在我创建的同一个线程下运行.但那么为什么GetCurrentThreadId()返回的价值不同于返回的价值_beginthreadex呢？

Answer 1

好吧,_beginthreadex不返回线程ID.线程id存储在_threadAddress,最后一个参数_beginthreadex.它的返回值是线程句柄(如CreateThread),而不是id.