linux多进程编程计算圆周率,中值积分定理计算pi值的多线程实现 -ag凯发k8国际

// parallel.cpp : 定义控制台应用程序的入口点。

//

#include "stdafx.h"

#include

#include

static long num_steps = 100000;

const int numthreads = 4;

double step, pi;

critical_section g_cs;

double sum = 0.0;

dword winapi countfunc(lpvoid parg) {

double x;

int i;

int temp = *(int *)parg;

int start = (temp*num_steps) / 4;

int end = start num_steps / 4;

for (i = start; i < end; i ) {

entercriticalsection(&g_cs);

x = (i 0.5)*step;

sum = sum 4.0 / (1.0 x*x);

leavecriticalsection(&g_cs);

}

return 0;

}

void main()

{

int i;

handle hthread[numthreads];

step = 1.0 / (double)num_steps;

int tnum[numthreads];

initializecriticalsection(&g_cs);

for (int i = 0; i < numthreads; i ) {

tnum[i] = i;

hthread[i] = createthread(null, 0, countfunc, (lpvoid)&tnum[i], 0, null);

}

waitformultipleobjects(numthreads, hthread, true, infinite);

deletecriticalsection(&g_cs);

pi = step * sum;

printf("pi = .9f\n", pi);

system("pause");

}

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