多线程例子_幂计算而后求和

功能:创建SIZE个线程，每个线程执行幂计算函数，然后求和。

#include <windows.h>
#include <iostream>
using namespace std;

DWORD WINAPI Power(LPVOID n);
#define SIZE 10
int main()
{
	DWORD threadId;
	HANDLE handles[SIZE];
	DWORD exitCode[SIZE];

	for(int i=0;i<SIZE; ++i)
	{
		handles[i] = CreateThread(NULL,
							0,
							Power,
							(LPVOID)i,
							0,
							&threadId);
	}
	WaitForMultipleObjects(SIZE, handles, TRUE, INFINITE);
	int sum =0;
	for(int i=0; i<SIZE;++i)
	{
		GetExitCodeThread(handles[i], &exitCode[i]);
		sum += exitCode[i];
	}
	
	cout<< "Sum = " <<sum<<endl;

	for(int i=0; i<SIZE;++i)
	{
		CloseHandle(handles[i]);
	}
	
	system("pause");
}

DWORD WINAPI Power(LPVOID n)
{
	int t = (int)n;
	int res = t*t;
	return res;
}

结果

285