第四题(迅雷笔试题):编写一个程序,开启3个线程,这3个线程的ID分别为A、B、C,每个线程将自己的ID在屏幕上打印10遍,要求输出结果必须按ABC的顺序显示;如:ABCABC….依次递推。
- #include <stdio.h>
- #include <process.h>
- #include <windows.h>
- #define g_hThreadEvent(n) g_hThreadEvent##1
- unsigned int __stdcall Fun(void *pPM);
- //线程个数
- const int THREAD_NUM = 8;
- //循环次数
- const int LOOP = 6;
- //互斥事件
- HANDLE g_hThreadEvent[THREAD_NUM];
- int main()
- {
- printf(" 子线程循环 10 次,接着主线程循环 100 次,接着又回到子线程循环10 次, 接着再回到主线程又循环 100 次,如此循环50次 ");
- int i = 0 , j;
- HANDLE hdl[THREAD_NUM];
- for (i = 0; i < THREAD_NUM; i++)
- g_hThreadEvent[i] = CreateEvent(NULL,FALSE,FALSE,NULL);
- //将线程编号作为线程参数传进去,先转换为指针,再转换为整形,
- for (i = 0; i < THREAD_NUM; i++)
- hdl[i] = (HANDLE)_beginthreadex(NULL,0,Fun,(void*)i,0,NULL);
- SetEvent(g_hThreadEvent[0] );
- WaitForMultipleObjects(THREAD_NUM,hdl,TRUE,INFINITE);
- for (i = 0; i < THREAD_NUM; i++)
- {
- CloseHandle(hdl[i]);
- CloseHandle(g_hThreadEvent[i]);
- }
- return 0;
- }
- unsigned int __stdcall Fun(void *pPM)
- {
- int num = (int)pPM;
- int i = 0;
- for( i = 0 ; i< LOOP;i++)
- {
- WaitForSingleObject(g_hThreadEvent[num],INFINITE);
- //printf(" 线程ID=%d,线程编号是%c ,%d ",GetCurrentThreadId(),num+'A');
- printf(" %c ",num+'A');
- if(num+1 == THREAD_NUM )
- printf(" ");
- SetEvent(g_hThreadEvent[(num+1)%THREAD_NUM]);
- }
- return 0;
- }