c++多线程实例
2013-07-21 02:45
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注意:在编译多线程文件之前,在VC上要作相应的设置Projects->settiong->C/C++,选择Category:Code Generation,Use run-time library:Debug MutiThreaded#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 return 1; // the thread exit code } void ThreadEntryPoint() { 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() { ThreadX * o1 = new ThreadX( 0, 3000, 200 ); 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 ); o1->threadName = "t1"; ThreadX * o2 = new ThreadX( -1000, 0, 200 ); 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"); return 0; }
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