新手,不使用同步,为什么输出的结果与使用同步的输出结果一样呢?
代码如下
// MyThreadTest.cpp : Defines the entry point for the console application.
//
#include "stdafx.h "
#include "afxmt.h "
#include "MyThreadTest.h "
#include <stdlib.h>
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// The one and only application object
#define count 10
CWinApp theApp;
int array[count],destarray[count];
//CCriticalSection Section;
UINT WriteThread(LPVOID param);
UINT ReadThread(LPVOID param);
using namespace std;
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
// initialize MFC and print and error on failure
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
cerr < < _T( "Fatal Error: MFC initialization failed ") < < endl;
nRetCode = 1;
}
else
{
// TODO: code your application 's behavior here.
CWinThread *pThread1,*pThread2,*pThread3,*pThread4;
pThread1 = AfxBeginThread(WriteThread,NULL);//启动线程
pThread2 = AfxBeginThread(WriteThread,NULL);//启动线程
pThread3 = AfxBeginThread(ReadThread,NULL);//启动线程
pThread4 = AfxBeginThread(ReadThread,NULL);//启动线程
WaitForSingleObject(pThread1-> m_hThread,INFINITE);
WaitForSingleObject(pThread2-> m_hThread,INFINITE);
WaitForSingleObject(pThread3-> m_hThread,INFINITE);
WaitForSingleObject(pThread4-> m_hThread,INFINITE);
for(int i=0;i <count;i++)
cout < < destarray[i] < <endl;
}
return nRetCode;
}
UINT WriteThread(LPVOID param)
{
//Section.Lock();
for(int x=0;x <count;x++)
{
array[x]=x;
}
//Section.Unlock();
return 0;
}
UINT ReadThread(LPVOID param)
{
//Section.Lock();
for(int x=0;x <count;x++){
destarray[x]=array[x];
}
//Section.Unlock();
return 0;
}
编译器VC6,按照教程,控制台输出应该是不连续的,但是我边输出如下
E:\vcproject\MyThreadTest\Debug> mythreadtest
0
1
2
3
4
5
6
7
8
9
请问应该如何修改程序或者配置项目,才能体现出线程同步与不同步的区别呢?
[解决办法]
循环中加个sleep（10）；这样就能看见了
[解决办法]
1、建议用WaitForMultiObjects
2、将以下代码
for(int i=0;i <count;i++)
cout < < destarray[i] < <endl;
}
放在ReadThread中
