WaitForMultipleObjects 用法

原创于 2024-04-09 14:48:39 发布 · 811 阅读

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本文展示了如何在Windows环境中使用C++创建多个线程，并通过事件机制实现线程间的通信，当特定事件被触发时，主线程会捕获并处理相应事件。

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#include <Windows.h>
#include <stdio.h>

const unsigned int THREAD_NUM = 3;
#define DATA_EVENT_SIZE 4 //事件总数
enum data_event_id { One, Two, Three, Four }; //事件标
HANDLE data_event_array[DATA_EVENT_SIZE]; //事件句柄数组

DWORD WINAPI ThreadFunc(LPVOID p)
{
   printf("I am a child thread 0 which pid is %d ...\n", GetCurrentThreadId()); //输出子线程pid
   Sleep(500);
   SetEvent(data_event_array[One]);
   printf("The child thread 0 which pid is %d quit ...\n", GetCurrentThreadId());
   return 0;
}

DWORD WINAPI ThreadFunc1(LPVOID p)
{
   printf("I am a child thread 1 which pid is %d ...\n", GetCurrentThreadId()); //输出子线程pid
   Sleep(2000);
   SetEvent(data_event_array[Two]);
   printf("The child thread 1 which pid is %d quit ...\n", GetCurrentThreadId());
   return 0;
}

DWORD WINAPI ThreadFunc2(LPVOID p)
{
   printf("I am a child thread 2 which pid is %d ...\n", GetCurrentThreadId()); //输出子线程pid
   Sleep(4000);
   SetEvent(data_event_array[Three]);
   printf("The child thread 2 which pid is %d quit ...,After SetEvent Three\n", GetCurrentThreadId());
   SetEvent(data_event_array[Four]);
   printf("The child thread 2 which pid is %d quit ...,After SetEvent Four\n", GetCurrentThreadId());
   return 0;
}

int main()
{
   printf("I am the main thread that pid is %d ...\n", GetCurrentThreadId()); //输出主线程pid
   HANDLE hThread[THREAD_NUM];
   hThread[0] = CreateThread(NULL, 0, ThreadFunc, 0, 0, NULL); // 创建线程
   hThread[1] = CreateThread(NULL, 0, ThreadFunc1, 0, 0, NULL); // 创建线程
   hThread[2] = CreateThread(NULL, 0, ThreadFunc2, 0, 0, NULL); // 创建线程

   //创建初始状态为无信号，触发后自动复位的事件
   data_event_array[One] = CreateEvent(NULL, FALSE, FALSE, NULL);
   data_event_array[Two] = CreateEvent(NULL, FALSE, FALSE, NULL);
   data_event_array[Three] = CreateEvent(NULL, FALSE, FALSE, NULL);
   data_event_array[Four] = CreateEvent(NULL, FALSE, FALSE, NULL);

   int resulut = 0;
   while (1)
   {
       resulut = WaitForMultipleObjects(DATA_EVENT_SIZE, data_event_array, FALSE, INFINITE); //只要有一个线程返回就结束
       Sleep(30);
       if (WAIT_OBJECT_0 == resulut)
       {
           printf("get the event one!\n");
       }
       else if (WAIT_OBJECT_0 + 1 == resulut)
       {
           printf("get the event two!\n");
       }
       else if (WAIT_OBJECT_0 + 2 == resulut)
       {
           printf("get the event three!\n");
       }
       else if (WAIT_OBJECT_0 + 3 == resulut)
       {
           printf("get the event four!\n");
       }
       else if (WAIT_FAILED == resulut)
       {
           printf("The fuction WaitForMultipleObjects error! \n");
       }
   }
   printf("The main thread which pid is %d quit ...\n", GetCurrentThreadId());
   return 0;
}

输出如下：