mutexdlg.cpp

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// MutexDlg.cpp : implementation file
//

#include "stdafx.h"
#include "Mutex.h"
#include "MutexDlg.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

void Randomize ();
int Random (int num);

/////////////////////////////////////////////////////////////////////////////
// CMutexDlg dialog

CMutexDlg::CMutexDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CMutexDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CMutexDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CMutexDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CMutexDlg)
	DDX_Control(pDX, IDC_MESSAGE_PROCESSOR, m_strProcessor);
	DDX_Control(pDX, IDC_MESSAGE_RECEIVER, m_strReceiver);
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CMutexDlg, CDialog)
	//{{AFX_MSG_MAP(CMutexDlg)
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMutexDlg message handlers

BOOL CMutexDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon

    Randomize ();
	m_bmpKey.LoadBitmap (IDB_MUTEXKEY);
	m_Images.Create (IDB_MUTEXKEY, 32, 2, ILC_MASK);

	m_strReceiver.GetWindowRect (m_rcReceiver);
	m_strProcessor.GetWindowRect (m_rcProcessor);
	ScreenToClient (m_rcReceiver);
	ScreenToClient (m_rcProcessor);
	m_rcReceiver.right = m_rcReceiver.left - 10;
	m_rcReceiver.left = m_rcReceiver.right - 32;
	m_rcProcessor.left = m_rcReceiver.left;
	m_rcProcessor.right = m_rcReceiver.right;
//
//	For a dialog box, ScreenToClient includes the title
//	bar, so adjust for it.
//
	m_rcProcessor.top += 16;
	m_rcProcessor.bottom += 16;
	m_rcReceiver.top += 16;
	m_rcReceiver.bottom += 16;

	AfxBeginThread (StartReceiver, this);
	AfxBeginThread (StartProcessor, this);

	return TRUE;  // return TRUE  unless you set the focus to a control
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CMutexDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CMutexDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

void CMutexDlg::AddItemToQueue(QUEUEITEM *pItem)
{
    m_strReceiver.SetWindowText ("Waiting for queue");
    CSingleLock DeleteQueue (&m_cs);
    DeleteQueue.Lock ();

    DrawKey (m_rcReceiver, true);
    m_strReceiver.SetWindowText ("Queue is locked");
    Sleep (Random(1500));
    DrawKey (m_rcReceiver, false);
    m_strReceiver.SetWindowText ("Queue is unlocked");
}

void CMutexDlg::DeleteItemFromQueue(QUEUEITEM *pItem)
{
    m_strProcessor.SetWindowText ("Waiting for queue");
    CSingleLock DeleteQueue (&m_cs);
    DeleteQueue.Lock ();

    DrawKey (m_rcProcessor, true);
    m_strProcessor.SetWindowText ("Queue is locked");
    Sleep (Random(1500));
    DrawKey (m_rcProcessor, false);
    m_strProcessor.SetWindowText ("Queue is unlocked");
}

UINT CMutexDlg::StartReceiver(void *pParam)
{
	CMutexDlg *pOwner = (CMutexDlg *) pParam;
	QUEUEITEM qi;
	while (1)
	{
		pOwner->m_strReceiver.SetWindowText ("Receiving item");
		Sleep (Random (1000));
		pOwner->AddItemToQueue (&qi);
	}
	return (0);
}

UINT CMutexDlg::StartProcessor(void *pParam)
{
	CMutexDlg *pOwner = (CMutexDlg *) pParam;
	QUEUEITEM qi;
	while (1)
	{
		pOwner->m_strProcessor.SetWindowText ("Processing item");
		Sleep (Random (500));
		pOwner->DeleteItemFromQueue (&qi);
	}
	return (0);
}

void CMutexDlg::DrawKey(CRect &rc, bool bDraw)
{

	CWindowDC dc(this);
	if (bDraw == false)
		m_Images.Draw (&dc, 1, CPoint (rc.left, rc.top), ILC_MASK);
	else
		m_Images.Draw (&dc, 0, CPoint (rc.left, rc.top), ILC_MASK);
}