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C++多線程代碼范例剖析
C++編程語言中支持多線程運(yùn)行。那么如何才能正確的實(shí)現(xiàn)這一功能呢？今天我們就在這里先通過一個(gè)帶來范例來詳細(xì)解讀C++多線程的應(yīng)用方式，希望初學(xué)者們可以根據(jù)我們介紹的內(nèi)容從中學(xué)到一些知識(shí)。
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C++多線程應(yīng)用示例：
主線程創(chuàng)建2個(gè)線程t1和t2，創(chuàng)建時(shí)2個(gè)線程就被掛起，后來調(diào)用ResumeThread恢復(fù)2個(gè)線程，是其開始執(zhí)行，調(diào)用WaitForSingleObject等待2個(gè)線程執(zhí)行完，然后推出主線程即結(jié)束進(jìn)程。
- #include
- #include
// for STL string class - #include
// for HANDLE - #include
// 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, 1, 2000 );
- 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( -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";
- ResumeThread( hth1 ); // serves the purpose of Jaeschke's t1->Start()
- ResumeThread( hth2 );
- WaitForSingleObject( hth1, INFINITE );
- WaitForSingleObject( hth2, INFINITE );
- GetExitCodeThread( hth1, &dwExitCode );
- printf( "thread 1 exited with code %u\n", dwExitCode );
- GetExitCodeThread( hth2, &dwExitCode );
- printf( "thread 2 exited with code %u\n", dwExitCode );
- CloseHandle( hth1 );
- CloseHandle( hth2 );
- delete o1;
- o1 = NULL;
- delete o2;
- o2 = NULL;
- printf("Primary thread terminating.\n");
- }
以上就是對(duì)C++多線程的相關(guān)介紹。
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