线程按指定顺序输出字符到数组

最新推荐文章于 2019-05-23 10:33:55 发布

原创最新推荐文章于 2019-05-23 10:33:55 发布 · 2.3k 阅读

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题目：

有三个线程，线程1的功能就是向字符数组输出A，线程2的功能就是向字符数组输出B，线程2的功能就是向字符数组输出C，要求按顺序向数组赋值ABCABCABC，ABC的个数由线程函数1的参数指定。

接口说明：

void Init(); //初始化函数

void Release(); //资源释放函数

unsignedint__stdcall ThreadFun1(PVOID pM) ; //线程函数1，传入一个int类型的指针，用于初始化输出A次数，资源需要线程释放

unsignedint__stdcall ThreadFun2(PVOID pM) ;//线程函数2，无参数传入

unsignedint__stdcall ThreadFun3(PVOID pM) ;//线程函数3，无参数传入

char g_write[1024]; //线程1,线程2,线程3按到顺序向该数组赋值。不用考虑数组是否越界，测试用例保证

源代码：

#include <string.h>
#include <stdlib.h>
#include <stdio.h>   
#include <process.h>   
#include <windows.h>   

#define MAXHANDLE  3

char  g_write[1028]; //线程1,线程2,线程3按到顺序向该数组赋值
HANDLE g_hThreadEvent[3];
HANDLE handle[MAXHANDLE];
int g_Number;

//线程1函数   
unsigned int __stdcall ThreadFun1(PVOID pM)  
{  
    int uiNumber = *(int *)pM;
    int iLoop    = 0;
    g_Number = uiNumber;
    for (iLoop; iLoop < uiNumber; iLoop++)
    {
        //printf("this is thread 1: %s\n", g_write);
        WaitForSingleObject(g_hThreadEvent[0], INFINITE);
        strcat(g_write, "A");
        SetEvent(g_hThreadEvent[1]);
    }
    _endthreadex(0);
    return 0; 
}  

//线程2函数   
unsigned int __stdcall ThreadFun2(PVOID pM)  
{  
    int iLoop = 0;
    for (iLoop; iLoop < g_Number; iLoop++)
    {
        //printf("this is thread 2: %s\n", g_write);
        WaitForSingleObject(g_hThreadEvent[1], INFINITE);
        strcat(g_write, "B");
        SetEvent(g_hThreadEvent[2]);
    }
    _endthreadex(0);
    return 0;  
}  

//线程3函数   
unsigned int __stdcall ThreadFun3(PVOID pM)  
{  
    int iLoop = 0;
    for (iLoop; iLoop < g_Number; iLoop++)
    {
        //printf("this is thread 2: %s\n", g_write);
        WaitForSingleObject(g_hThreadEvent[2], INFINITE);
        strcat(g_write, "C");
        SetEvent(g_hThreadEvent[0]);
    }
    _endthreadex(0);
    return 0;  
}  

void Init(void)
{
    g_hThreadEvent[0] = CreateEvent(NULL, FALSE, TRUE, NULL);
    g_hThreadEvent[1] = CreateEvent(NULL, FALSE, FALSE, NULL);
    g_hThreadEvent[2] = CreateEvent(NULL, FALSE, FALSE, NULL);
    memset(g_write, NULL, sizeof(g_write));
}

void Release(void)
{
    int iLoop = 0; 
    for (int iLoop = 0; iLoop < MAXHANDLE; iLoop++)
    {
        CloseHandle(handle[iLoop]);
    }
}

int main( int Argc, char* Argv[])
{
    int uiNumber = 10;   //需要重复打印的次数
    int *num     = NULL;

    Init();
    num  = (int*)malloc(sizeof(int));
    *num = uiNumber;
    handle[0] = (HANDLE)_beginthreadex(NULL, 0, ThreadFun1, num, 0, NULL);
    handle[1] = (HANDLE)_beginthreadex(NULL, 0, ThreadFun2, NULL, 0, NULL);
    handle[2] = (HANDLE)_beginthreadex(NULL, 0, ThreadFun3, NULL, 0, NULL);
    WaitForMultipleObjects(MAXHANDLE, handle, TRUE, INFINITE);
    Release();
    printf("g_write = %s\n", g_write);
    system("pause");
    return 0;
}