Shulou(Shulou.com)06/03 Report--

As a distributed server developer, I have my own experience and experience in server development, multi-thread development and concurrent programming. I would like to share it with my colleagues. I would like to discuss thread concurrent program development under Windows.

The following demonstrates the basic use of threads by implementing a simple array sorting with two threads.

The principle is:

To save execution time, add parallelism, divide the problem into several small problems and assign them to several threads (divide and conquer), divide the problem into several smaller units, and make it easier to create parallel logic in the implementation. At the same time, the use of system resources in parallel can optimize the application and improve its running speed.

# include "stdafx.h" # include # include 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 iArray 1 [block _ SIZE]; int iArray 2 [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);coutiArray[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

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