多線程並行計算資料總和 C語言demo

標籤：clu   system   thread   地址   std   oid   div   read   線程   

多線程計算整型數組資料總和：

#include <stdio.h>#include <stdlib.h>#include <Windows.h>#include<process.h>#include <time.h>#define N 1024struct Myinfo{    int *pstart;//開始地址    int length;//長度    int id;//線程編號    int sum;//儲存資料的和};void  add(void *p) //void *p可以儲存任何類型的指標{    struct Myinfo *pinfo = p;    for (int i = 0; i < pinfo->length;i++)    {        pinfo->sum += pinfo->pstart[i];    }    printf("\n線程%d計算的結果%d", pinfo->id, pinfo->sum);}void main(){    time_t ts;    unsigned int num = time(&ts);//傳遞地址    srand(num);    int data[N] = { 0 };
　　 // 進行賦值    for (int i = 0; i < N; i++)    {        data[i] = rand() % 1000;        //printf("%4d", data[i] = rand() % 1000);    }    int sum = 0;
　　 //計算總和    for (int i = 0; i < N; i++)    {        sum += data[i];    }    printf("\n總和=%d", sum);    struct Myinfo info[8] = { 0 };    for (int i = 0; i < 8;i++)    {        info[i].id = i;        info[i].length = N / 8;        info[i].sum = 0;        info[i].pstart = data + i*N / 8; //注意這裡地址的移動        _beginthread(add, 0, &info[i]);    }    system("pause");    int lastsum=0;    for (int i = 0; i < 8;i++)    {        lastsum += info[i].sum;    }    printf("\n多線程總和=%d", lastsum);    system("pause");}

在此也可以結合隊列來使用

 

多線程並行計算資料總和 C語言demo