C++多线程（二）(_beginThreadex创建多线程)

转 https://blog.csdn.net/maopig/article/details/6772258
#include <stdio.h>
#include <string>             // for STL string class
#include <windows.h>          // for HANDLE
#include <process.h>          // for _beginthread()

using namespace std;

class ThreadX
{
private:
    int loopStart;
    int loopEnd;
    int dispFrequency;

public:
string threadName;

    ThreadX( int startValue, int endValue, int frequency )
    {
        loopStart = startValue;
        loopEnd = endValue;
        dispFrequency = frequency;
    }

    static unsigned __stdcall ThreadStaticEntryPoint(void * pThis)
    {
        ThreadX * pthX = (ThreadX*)pThis;   // the tricky cast
        pthX->ThreadEntryPoint();           // now call the true entry-point-function

        // A thread terminates automatically if it completes execution,
        // or it can terminate itself with a call to _endthread().

        return 1;          // the thread exit code
    }

    void ThreadEntryPoint()
    {
        // This is the desired entry-point-function but to get
        // here we have to use a 2 step procedure involving
        // the ThreadStaticEntryPoint() function.

        for (int i = loopStart; i <= loopEnd; ++i)
        {
            if (i % dispFrequency == 0)
            {
                printf( "%s: i = %d\n", threadName.c_str(), i );
            }
        }
        printf( "%s thread terminating\n", threadName.c_str() );
    }
};
int main()
{
    // All processes get a primary thread automatically. This primary
    // thread can generate additional threads.  In this program the
    // primary thread creates 2 additional threads and all 3 threads
    // then run simultaneously without any synchronization.  No data
    // is shared between the threads.

    // We instantiate an object of the ThreadX class. Next we will
    // create a thread and specify that the thread is to begin executing
    // the function ThreadEntryPoint() on object o1. Once started,
    // this thread will execute until that function terminates or
    // until the overall process terminates.

    ThreadX * o1 = new ThreadX( 0, 1000, 2000 );

    // When developing a multithreaded WIN32-based application with
    // Visual C++, you need to use the CRT thread functions to create
    // any threads that call CRT functions. Hence to create and terminate
    // threads, use _beginthreadex() and _endthreadex() instead of
    // the Win32 APIs CreateThread() and EndThread().

    // The multithread library LIBCMT.LIB includes the _beginthread()
    // and _endthread() functions. The _beginthread() function performs
    // initialization without which many C run-time functions will fail.
    // You must use _beginthread() instead of CreateThread() in C programs
    // built with LIBCMT.LIB if you intend to call C run-time functions.

    // Unlike the thread handle returned by _beginthread(), the thread handle
    // returned by _beginthreadex() can be used with the synchronization APIs.

    HANDLE   hth1;
    unsigned  uiThread1ID;

    hth1 = (HANDLE)_beginthreadex( NULL,         // security
        0,            // stack size
        ThreadX::ThreadStaticEntryPoint,
        o1,           // arg list
        CREATE_SUSPENDED,  // so we can later call ResumeThread()
        &uiThread1ID );

    if ( hth1 == 0 )
        printf("Failed to create thread 1\n");

    DWORD   dwExitCode;

    GetExitCodeThread( hth1, &dwExitCode );  // should be STILL_ACTIVE = 0x00000103 = 259
    printf( "initial thread 1 exit code = %u\n", dwExitCode );

    // The System::Threading::Thread object in C++/CLI has a "Name" property.
    // To create the equivalent functionality in C++ I added a public data member
    // named threadName.

    o1->threadName = "t1";

    ThreadX * o2 = new ThreadX( -1000000, 0, 2000 );

    HANDLE   hth2;
    unsigned  uiThread2ID;

    hth2 = (HANDLE)_beginthreadex( NULL,         // security
        0,            // stack size
        ThreadX::ThreadStaticEntryPoint,
        o2,           // arg list
        CREATE_SUSPENDED,  // so we can later call ResumeThread()
        &uiThread2ID );

    if ( hth2 == 0 )
        printf("Failed to create thread 2\n");

    GetExitCodeThread( hth2, &dwExitCode );  // should be STILL_ACTIVE = 0x00000103 = 259
    printf( "initial thread 2 exit code = %u\n", dwExitCode );

    o2->threadName = "t2";

    // If we hadn't specified CREATE_SUSPENDED in the call to _beginthreadex()
    // we wouldn't now need to call ResumeThread().

    ResumeThread( hth1 );   // serves the purpose of Jaeschke's t1->Start()

    ResumeThread( hth2 );//你需要恢复线程的句柄 使用该函数能够激活线程的运行

    // In C++/CLI the process continues until the last thread exits.
    // That is, the thread's have independent lifetimes. Hence
    // Jaeschke's original code was designed to show that the primary
    // thread could exit and not influence the other threads.

    // However in C++ the process terminates when the primary thread exits
    // and when the process terminates all its threads are then terminated.
    // Hence if you comment out the following waits, the non-primary
    // threads will never get a chance to run.

    WaitForSingleObject( hth1, INFINITE );
    WaitForSingleObject( hth2, INFINITE );
    //WaitForSingleObject 函数用来检测 hHandle 事件的信号状态，当函数的执行时间超过 dwMilliseconds 就返回，
    //但如果参数 dwMilliseconds 为 INFINITE 时函数将直到相应时间事件变成有信号状态才返回，否则就一直等待下去
    //，直到 WaitForSingleObject 有返回直才执行后面的代码

    GetExitCodeThread( hth1, &dwExitCode );
    printf( "thread 1 exited with code %u\n", dwExitCode );

    GetExitCodeThread( hth2, &dwExitCode );
    printf( "thread 2 exited with code %u\n", dwExitCode );
    //
    //GetExitCodeThread这个函数是获得线程的退出码，  第二个参数是一个 DWORD的指针，
    //用户应该使用一个 DWORD 类型的变量去接收数据，返回的数据是线程的退出码，
    //第一个参数是线程句柄，用 CreateThread 创建线程时获得到。
    //通过线程退出码可以判断线程是否正在运行，还是已经退出。


    // The handle returned by _beginthreadex() has to be closed
    // by the caller of _beginthreadex().

    CloseHandle( hth1 );
    CloseHandle( hth2 );

    delete o1;
    o1 = NULL;

    delete o2;
    o2 = NULL;

    printf("Primary thread terminating.\n");
}