Windows多线程开发之并发线程程序研究
做为一名分布式服务器开发人员，在服务器开发领域、多线程开发和并发编程方面有自己的心得和经验，愿意分享给同仁，今讨论下Windows下线程并发程序开发。
下面用用两个线程实现一个简单的数组排序，演示了线程的基本用法。
原理是：
为了节省执行时间而添加并行，把问题划分为几个小问题，并分配给几个线程（分而治之），把问题划分成若干更小的单元，更容易在实现中创建并行逻辑。同时，在并行中使用系统资源能优化应用程序并提高其运行速度。
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#include "stdafx.h" #include <iostream>#include <Windows.h>#include <Winternl.h>#include <tchar.h>#include <winbase.h>using namespace std;
#define THREADS_NUMBER 2#define ELEMENTS_NUMBER 200#define BLOCK_SIZE ELEMENTS_NUMBER / THREADS_NUMBER #define MAX_VALUE 1000typedef struct _tagARRAYOBJECT
{ int* iArray;
int iSize;
int iThreadID;
} ARRAYOBJECT, *PARRAYOBJECT;DWORD WINAPI ThreadStart( LPVOID lpParameter);
void PrintArray( int* iArray, int iSize);
void MergeArrays(int* leftArray, int leftArrayLenght, int* rightArray, int rightArrayLenght, int* mergedArray);
int _tmain(int argc, _TCHAR* argv[])
{ int iArray1[BLOCK_SIZE];
int iArray2[BLOCK_SIZE];
int iArray[ELEMENTS_NUMBER];
for (int iIndex = 0; iIndex < BLOCK_SIZE; iIndex++)
{
iArray1[iIndex] = rand() % MAX_VALUE;
iArray2[iIndex] = rand() % MAX_VALUE;
}
HANDLE hThreads[THREADS_NUMBER];
ARRAYOBJECT pObject1 = { &(iArray1[0]), BLOCK_SIZE, 0 };
hThreads[0] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadStart,(LPVOID)& pObject1, 0, NULL);
ARRAYOBJECT pObject2 = { &(iArray2[0]), BLOCK_SIZE, 1 };
hThreads[1] = CreateThread(NULL, 0, (LPTHREAD_START_ROUTINE)ThreadStart, (LPVOID)& pObject2, 0, NULL);cout<<"Waiting execution..." << endl;
WaitForMultipleObjects(THREADS_NUMBER, hThreads, TRUE, INFINITE);
MergeArrays(&iArray1[0], BLOCK_SIZE, &iArray2[0], BLOCK_SIZE, &iArray[0]);
PrintArray(iArray, ELEMENTS_NUMBER);
CloseHandle(hThreads[0]);
CloseHandle(hThreads[1]);
cout<< "Array sorted..." << endl;
getchar();
return 0;
} DWORD WINAPI ThreadStart(LPVOID lpParameter)
{ PARRAYOBJECT pObject = (PARRAYOBJECT)lpParameter;
int iTmp = 0;
for (int iIndex = 0; iIndex < pObject->iSize; iIndex++)
{
for (int iEndIndex = pObject->iSize - 1; iEndIndex > iIndex; iEndIndex--)
{
if (pObject->iArray[iEndIndex] < pObject->iArray[iIndex])
{
iTmp = pObject->iArray[iEndIndex];
pObject->iArray[iEndIndex] = pObject->iArray[iIndex];
pObject->iArray[iIndex] = iTmp;
}
}
}
return 0;
} void PrintArray(int* iArray, int iSize)
{ for (int iIndex = 0; iIndex < iSize; iIndex++)
{
cout << " " << iArray[iIndex];
}
cout << endl;
}void MergeArrays(int* leftArray, int leftArrayLenght, int* rightArray, int rightArrayLenght, int* mergedArray)
{ int i = 0;
int j = 0;
int k = 0;
while (i < leftArrayLenght && j < rightArrayLenght)
{
if (leftArray[i] < rightArray[j])
{
mergedArray[k] = leftArray[i];
i++;
}
else
{
mergedArray[k] = rightArray[j];
j++;
}
k++;
}
if (i >= leftArrayLenght)
{
while (j < rightArrayLenght)
{
mergedArray[k] = rightArray[j];
j++;
k++;
}
}
if (j >= rightArrayLenght)
{
while (i < leftArrayLenght)
{
mergedArray[k] = leftArray[i];
i++;
k++;
}
}
} |
运行结果：
中间在编译运行的时候会遇到一些细节问题，特此说明：
出现错误：
错误 C1189 #error: "No Target Architecture"
设置如下即可：在_X86_
分布式开发，服务器开发，多线程开发，并发程序设计，任重而道远。
本文转自 liam2199 博客，原文链接：http://blog.51cto.com/liam2199/1963538 如需转载请自行联系原作者