Biegral Blog

      写了个超级简单的软件，界面如下：

      1. 单线程：

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}
//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
    int i, j;
    int n = 1;
    for(i = 0; i < 30000; i++)
    {
        for(j = 0; j < 30000; j++)
        {
            n = -n;
        }
    }

    ShowMessage(IntToStr(n));
}
//---------------------------------------------------------------------------

      点击按钮后，好卡。

      2. 多线程：

//---------------------------------------------------------------------------

#include <vcl.h>
#pragma hdrstop

#include "Unit1.h"
//---------------------------------------------------------------------------
#pragma package(smart_init)
#pragma resource "*.dfm"
TForm1 *Form1;
//---------------------------------------------------------------------------
__fastcall TForm1::TForm1(TComponent* Owner)
    : TForm(Owner)
{
}

DWORD WINAPI fun(LPVOID lp)
{
    int i, j;
    int n = 1;
    for(i = 0; i < 30000; i++)
    {
        for(j = 0; j < 30000; j++)
        {
            n = -n;
        }
    }

    ShowMessage(IntToStr(n));

    return 0;
}


//---------------------------------------------------------------------------

void __fastcall TForm1::Button1Click(TObject *Sender)
{
   HANDLE h = CreateThread(NULL, 0, fun, NULL, 0, NULL);
   CloseHandle(h);
}
//---------------------------------------------------------------------------

      点击按钮后，不卡。
 

      有多线程就是好啊！睡觉去。