/////////////////////////////////////////////////////////////////////////////
// Name: thread.cpp
-// Purpose: wxWindows thread sample
+// Purpose: wxWidgets thread sample
// Author: Guilhem Lavaux, Vadim Zeitlin
// Modified by:
// Created: 06/16/98
// RCS-ID: $Id$
-// Copyright: (c) 1998-2002 wxWindows team
+// Copyright: (c) 1998-2002 wxWidgets team
// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
+// ============================================================================
+// declarations
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"
#include "wx/thread.h"
#include "wx/dynarray.h"
-
+#include "wx/numdlg.h"
#include "wx/progdlg.h"
+// ----------------------------------------------------------------------------
+// resources
+// ----------------------------------------------------------------------------
+
+#include "../sample.xpm"
+
+// ----------------------------------------------------------------------------
+// private classes
+// ----------------------------------------------------------------------------
+
// define this to use wxExecute in the exec tests, otherwise just use system
#define USE_EXECUTE
#endif
class MyThread;
-WX_DEFINE_ARRAY_NO_PTR(wxThread *, wxArrayThread);
+WX_DEFINE_ARRAY_PTR(wxThread *, wxArrayThread);
+
+// ----------------------------------------------------------------------------
+// the application object
+// ----------------------------------------------------------------------------
-// Define a new application type
class MyApp : public wxApp
{
public:
MyApp();
- virtual ~MyApp();
+ virtual ~MyApp(){};
virtual bool OnInit();
-public:
+ // critical section protects access to all of the fields below
+ wxCriticalSection m_critsect;
+
// all the threads currently alive - as soon as the thread terminates, it's
// removed from the array
wxArrayThread m_threads;
- // crit section protects access to all of the arrays below
- wxCriticalSection m_critsect;
+ // semaphore used to wait for the threads to exit, see MyFrame::OnQuit()
+ wxSemaphore m_semAllDone;
- // the (mutex, condition) pair used to wait for the threads to exit, see
- // MyFrame::OnQuit()
- wxMutex m_mutexAllDone;
- wxCondition m_condAllDone;
-
- // the last exiting thread should signal m_condAllDone if this is true
- // (protected by the same m_critsect)
- bool m_waitingUntilAllDone;
+ // indicates that we're shutting down and all threads should exit
+ bool m_shuttingDown;
};
-// Create a new application object
-IMPLEMENT_APP(MyApp)
+// ----------------------------------------------------------------------------
+// the main application frame
+// ----------------------------------------------------------------------------
-// Define a new frame type
class MyFrame: public wxFrame
{
public:
// ctor
MyFrame(wxFrame *frame, const wxString& title, int x, int y, int w, int h);
+ virtual ~MyFrame();
- // operations
- void WriteText(const wxString& text) { m_txtctrl->WriteText(text); }
+ // this function is MT-safe, i.e. it can be called from worker threads
+ // safely without any additional locking
+ void LogThreadMessage(const wxString& text)
+ {
+ wxCriticalSectionLocker lock(m_csMessages);
+ m_messages.push_back(text);
+
+ // as we effectively log the messages from the idle event handler,
+ // ensure it's going to be called now that we have some messages to log
+ wxWakeUpIdle();
+ }
// accessors for MyWorkerThread (called in its context!)
bool Cancelled();
-protected:
- // callbacks
+private:
+ // event handlers
+ // --------------
+
void OnQuit(wxCommandEvent& event);
void OnClear(wxCommandEvent& event);
void OnResumeThread(wxCommandEvent& event);
void OnStartWorker(wxCommandEvent& event);
- void OnWorkerEvent(wxCommandEvent& event);
- void OnUpdateWorker(wxUpdateUIEvent& event);
-
void OnExecMain(wxCommandEvent& event);
- void OnExecThread(wxCommandEvent& event);
+ void OnStartGUIThread(wxCommandEvent& event);
void OnShowCPUs(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
void OnIdle(wxIdleEvent &event);
+ void OnWorkerEvent(wxThreadEvent& event);
+ void OnUpdateWorker(wxUpdateUIEvent& event);
+
+
+ // thread helper functions
+ // -----------------------
-private:
// helper function - creates a new thread (but doesn't run it)
MyThread *CreateThread();
+ // update display in our status bar: called during idle handling
+ void UpdateThreadStatus();
+
+ // log the messages queued by LogThreadMessage()
+ void DoLogThreadMessages();
+
+
+ // internal variables
+ // ------------------
+
// just some place to put our messages in
wxTextCtrl *m_txtctrl;
+ // the array of pending messages to be displayed and the critical section
+ // protecting it
+ wxArrayString m_messages;
+ wxCriticalSection m_csMessages;
+
// remember the number of running threads and total number of threads
- size_t m_nRunning, m_nCount;
+ size_t m_nRunning,
+ m_nCount;
// the progress dialog which we show while worker thread is running
wxProgressDialog *m_dlgProgress;
// was the worker thread cancelled by user?
bool m_cancelled;
-
- // protects m_cancelled
- wxCriticalSection m_critsectWork;
+ wxCriticalSection m_csCancelled; // protects m_cancelled
DECLARE_EVENT_TABLE()
};
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
// ID for the menu commands
enum
{
- THREAD_QUIT = 1,
+ THREAD_QUIT = wxID_EXIT,
+ THREAD_ABOUT = wxID_ABOUT,
THREAD_TEXT = 101,
THREAD_CLEAR,
THREAD_START_THREAD = 201,
THREAD_STOP_THREAD,
THREAD_PAUSE_THREAD,
THREAD_RESUME_THREAD,
- THREAD_START_WORKER,
+ THREAD_START_WORKER,
THREAD_EXEC_MAIN,
- THREAD_EXEC_THREAD,
+ THREAD_START_GUI_THREAD,
THREAD_SHOWCPUS,
- THREAD_ABOUT,
- WORKER_EVENT // this one gets sent from the worker thread
+ WORKER_EVENT = wxID_HIGHEST+1, // this one gets sent from MyWorkerThread
+ GUITHREAD_EVENT // this one gets sent from MyGUIThread
};
// ----------------------------------------------------------------------------
-// GUI thread
+// a simple thread
// ----------------------------------------------------------------------------
class MyThread : public wxThread
{
public:
MyThread(MyFrame *frame);
+ virtual ~MyThread();
// thread execution starts here
virtual void *Entry();
- // called when the thread exits - whether it terminates normally or is
- // stopped with Delete() (but not when it is Kill()ed!)
- virtual void OnExit();
-
- // write something to the text control
- void WriteText(const wxString& text);
+ // write something to the text control in the main frame
+ void WriteText(const wxString& text)
+ {
+ m_frame->LogThreadMessage(text);
+ }
public:
- size_t m_count;
+ unsigned m_count;
MyFrame *m_frame;
};
-MyThread::MyThread(MyFrame *frame)
- : wxThread()
-{
- m_count = 0;
- m_frame = frame;
-}
-
-void MyThread::WriteText(const wxString& text)
-{
- wxString msg;
-
- // before doing any GUI calls we must ensure that this thread is the only
- // one doing it!
-
- wxMutexGuiEnter();
-
- msg << text;
- m_frame->WriteText(msg);
-
- wxMutexGuiLeave();
-}
-
-void MyThread::OnExit()
-{
- wxCriticalSectionLocker locker(wxGetApp().m_critsect);
-
- wxArrayThread& threads = wxGetApp().m_threads;
- threads.Remove(this);
-
- if ( threads.IsEmpty() )
- {
- // signal the main thread that there are no more threads left if it is
- // waiting for us
- if ( wxGetApp().m_waitingUntilAllDone )
- {
- wxGetApp().m_waitingUntilAllDone = FALSE;
-
- wxMutexLocker lock(wxGetApp().m_mutexAllDone);
- wxGetApp().m_condAllDone.Signal();
- }
- }
-}
-
-void *MyThread::Entry()
-{
- wxString text;
-
- text.Printf(wxT("Thread 0x%lx started (priority = %u).\n"),
- GetId(), GetPriority());
- WriteText(text);
- // wxLogMessage(text); -- test wxLog thread safeness
-
- for ( m_count = 0; m_count < 10; m_count++ )
- {
- // check if we were asked to exit
- if ( TestDestroy() )
- break;
-
- text.Printf(wxT("[%u] Thread 0x%lx here.\n"), m_count, GetId());
- WriteText(text);
-
- // wxSleep() can't be called from non-GUI thread!
- wxThread::Sleep(1000);
- }
-
- text.Printf(wxT("Thread 0x%lx finished.\n"), GetId());
- WriteText(text);
- // wxLogMessage(text); -- test wxLog thread safeness
-
- return NULL;
-}
-
// ----------------------------------------------------------------------------
-// worker thread
+// a worker thread
// ----------------------------------------------------------------------------
class MyWorkerThread : public wxThread
public:
MyFrame *m_frame;
- size_t m_count;
+ unsigned m_count;
};
-MyWorkerThread::MyWorkerThread(MyFrame *frame)
- : wxThread()
-{
- m_frame = frame;
- m_count = 0;
-}
+// ----------------------------------------------------------------------------
+// a thread which executes GUI calls using wxMutexGuiEnter/Leave
+// ----------------------------------------------------------------------------
-void MyWorkerThread::OnExit()
-{
-}
+#define GUITHREAD_BMP_SIZE 300
+#define GUITHREAD_NUM_UPDATES 50
+class MyImageDialog;
-void *MyWorkerThread::Entry()
+class MyGUIThread : public wxThread
{
- for ( m_count = 0; !m_frame->Cancelled() && (m_count < 100); m_count++ )
+public:
+ MyGUIThread(MyImageDialog *dlg) : wxThread(wxTHREAD_JOINABLE)
{
- // check if we were asked to exit
- if ( TestDestroy() )
- break;
-
- // create any type of command event here
- wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT );
- event.SetInt( m_count );
-
- // send in a thread-safe way
- wxPostEvent( m_frame, event );
-
- // wxSleep() can't be called from non-main thread!
- wxThread::Sleep(200);
+ m_dlg = dlg;
}
- wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT );
- event.SetInt(-1); // that's all
- wxPostEvent( m_frame, event );
+ virtual ExitCode Entry();
- return NULL;
-}
+private:
+ MyImageDialog *m_dlg;
+};
// ----------------------------------------------------------------------------
-// a thread which simply calls wxExecute
+// an helper dialog used by MyFrame::OnStartGUIThread
// ----------------------------------------------------------------------------
-class MyExecThread : public wxThread
+class MyImageDialog: public wxDialog
{
public:
- MyExecThread(const wxChar *command) : wxThread(wxTHREAD_JOINABLE),
- m_command(command)
- {
- Create();
- }
+ // ctor
+ MyImageDialog(wxFrame *frame);
+ ~MyImageDialog();
- virtual ExitCode Entry()
- {
- return (ExitCode)EXEC(m_command);
- }
+ // stuff used by MyGUIThread:
+ wxBitmap m_bmp; // the bitmap drawn by MyGUIThread
+ wxCriticalSection m_csBmp; // protects m_bmp
private:
- wxString m_command;
+ void OnGUIThreadEvent(wxThreadEvent& event);
+ void OnPaint(wxPaintEvent&);
+
+ MyGUIThread m_thread;
+ int m_nCurrentProgress;
+
+ DECLARE_EVENT_TABLE()
};
-// ----------------------------------------------------------------------------
+// ============================================================================
// implementation
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// the application class
+// ----------------------------------------------------------------------------
+
+// Create a new application object
+IMPLEMENT_APP(MyApp)
+
+MyApp::MyApp()
+{
+ m_shuttingDown = false;
+}
+
+// `Main program' equivalent, creating windows and returning main app frame
+bool MyApp::OnInit()
+{
+ if ( !wxApp::OnInit() )
+ return false;
+
+ // uncomment this to get some debugging messages from the trace code
+ // on the console (or just set WXTRACE env variable to include "thread")
+ wxLog::AddTraceMask("thread");
+
+ // Create the main frame window
+ MyFrame *frame = new MyFrame((wxFrame *)NULL, _T("wxWidgets threads sample"),
+ 50, 50, 450, 340);
+ SetTopWindow(frame);
+
+ // Show the frame
+ frame->Show(true);
+
+ return true;
+}
+
+// ----------------------------------------------------------------------------
+// MyFrame
// ----------------------------------------------------------------------------
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(THREAD_PAUSE_THREAD, MyFrame::OnPauseThread)
EVT_MENU(THREAD_RESUME_THREAD, MyFrame::OnResumeThread)
+ EVT_MENU(THREAD_START_WORKER, MyFrame::OnStartWorker)
EVT_MENU(THREAD_EXEC_MAIN, MyFrame::OnExecMain)
- EVT_MENU(THREAD_EXEC_THREAD, MyFrame::OnExecThread)
+ EVT_MENU(THREAD_START_GUI_THREAD, MyFrame::OnStartGUIThread)
EVT_MENU(THREAD_SHOWCPUS, MyFrame::OnShowCPUs)
EVT_MENU(THREAD_ABOUT, MyFrame::OnAbout)
EVT_UPDATE_UI(THREAD_START_WORKER, MyFrame::OnUpdateWorker)
- EVT_MENU(THREAD_START_WORKER, MyFrame::OnStartWorker)
- EVT_MENU(WORKER_EVENT, MyFrame::OnWorkerEvent)
-
+ EVT_THREAD(WORKER_EVENT, MyFrame::OnWorkerEvent)
EVT_IDLE(MyFrame::OnIdle)
END_EVENT_TABLE()
-MyApp::MyApp()
- : m_condAllDone(m_mutexAllDone)
-{
- // the mutex associated with a condition must be initially locked, it will
- // only be unlocked when we call Wait()
- m_mutexAllDone.Lock();
-
- m_waitingUntilAllDone = FALSE;
-}
-
-MyApp::~MyApp()
-{
- // the mutex must be unlocked before being destroyed
- m_mutexAllDone.Unlock();
-}
-
-// `Main program' equivalent, creating windows and returning main app frame
-bool MyApp::OnInit()
+// My frame constructor
+MyFrame::MyFrame(wxFrame *frame, const wxString& title,
+ int x, int y, int w, int h)
+ : wxFrame(frame, wxID_ANY, title, wxPoint(x, y), wxSize(w, h))
{
- // uncomment this to get some debugging messages from the trace code
- // on the console (or just set WXTRACE env variable to include "thread")
- //wxLog::AddTraceMask("thread");
-
- // Create the main frame window
- MyFrame *frame = new MyFrame((wxFrame *)NULL, _T("wxWindows threads sample"),
- 50, 50, 450, 340);
+ SetIcon(wxIcon(sample_xpm));
// Make a menubar
wxMenuBar *menuBar = new wxMenuBar;
wxMenu *menuThread = new wxMenu;
menuThread->Append(THREAD_START_THREAD, _T("&Start a new thread\tCtrl-N"));
menuThread->Append(THREAD_START_THREADS, _T("Start &many threads at once"));
- menuThread->Append(THREAD_STOP_THREAD, _T("S&top a running thread\tCtrl-S"));
+ menuThread->Append(THREAD_STOP_THREAD, _T("S&top the last spawned thread\tCtrl-S"));
menuThread->AppendSeparator();
- menuThread->Append(THREAD_PAUSE_THREAD, _T("&Pause a running thread\tCtrl-P"));
- menuThread->Append(THREAD_RESUME_THREAD, _T("&Resume suspended thread\tCtrl-R"));
+ menuThread->Append(THREAD_PAUSE_THREAD, _T("&Pause the last spawned running thread\tCtrl-P"));
+ menuThread->Append(THREAD_RESUME_THREAD, _T("&Resume the first suspended thread\tCtrl-R"));
menuThread->AppendSeparator();
- menuThread->Append(THREAD_START_WORKER, _T("Start &worker thread\tCtrl-W"));
+ menuThread->Append(THREAD_START_WORKER, _T("Start a &worker thread\tCtrl-W"));
+ menuThread->Append(THREAD_EXEC_MAIN, _T("&Launch a program from main thread\tF5"));
+ menuThread->Append(THREAD_START_GUI_THREAD, _T("Launch a &GUI thread\tF6"));
menuBar->Append(menuThread, _T("&Thread"));
- wxMenu *menuExec = new wxMenu;
- menuExec->Append(THREAD_EXEC_MAIN, _T("&Launch a program from main thread\tF5"));
- menuExec->Append(THREAD_EXEC_THREAD, _T("L&aunch a program from a thread\tCtrl-F5"));
- menuBar->Append(menuExec, _T("&Execute"));
-
wxMenu *menuHelp = new wxMenu;
menuHelp->Append(THREAD_SHOWCPUS, _T("&Show CPU count"));
menuHelp->AppendSeparator();
menuHelp->Append(THREAD_ABOUT, _T("&About..."));
menuBar->Append(menuHelp, _T("&Help"));
- frame->SetMenuBar(menuBar);
+ SetMenuBar(menuBar);
- // Show the frame
- frame->Show(TRUE);
+ m_nRunning = m_nCount = 0;
- SetTopWindow(frame);
+ m_dlgProgress = (wxProgressDialog *)NULL;
- return TRUE;
+#if wxUSE_STATUSBAR
+ CreateStatusBar(2);
+#endif // wxUSE_STATUSBAR
+
+ m_txtctrl = new wxTextCtrl(this, wxID_ANY, _T(""), wxPoint(0, 0), wxSize(0, 0),
+ wxTE_MULTILINE | wxTE_READONLY);
}
-// My frame constructor
-MyFrame::MyFrame(wxFrame *frame, const wxString& title,
- int x, int y, int w, int h)
- : wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h))
+MyFrame::~MyFrame()
{
- m_nRunning = m_nCount = 0;
+ // NB: although the OS will terminate all the threads anyhow when the main
+ // one exits, it's good practice to do it ourselves -- even if it's not
+ // completely trivial in this example
- m_dlgProgress = (wxProgressDialog *)NULL;
+ // tell all the threads to terminate: note that they can't terminate while
+ // we're deleting them because they will block in their OnExit() -- this is
+ // important as otherwise we might access invalid array elements
- CreateStatusBar(2);
+ {
+ wxCriticalSectionLocker locker(wxGetApp().m_critsect);
- m_txtctrl = new wxTextCtrl(this, -1, _T(""), wxPoint(0, 0), wxSize(0, 0),
- wxTE_MULTILINE | wxTE_READONLY);
+ // check if we have any threads running first
+ const wxArrayThread& threads = wxGetApp().m_threads;
+ size_t count = threads.GetCount();
+
+ if ( !count )
+ return;
+ // set the flag indicating that all threads should exit
+ wxGetApp().m_shuttingDown = true;
+ }
+
+ // now wait for them to really terminate
+ wxGetApp().m_semAllDone.Wait();
}
MyThread *MyFrame::CreateThread()
return thread;
}
+void MyFrame::DoLogThreadMessages()
+{
+ wxCriticalSectionLocker lock(m_csMessages);
+
+ const size_t count = m_messages.size();
+ for ( size_t n = 0; n < count; n++ )
+ {
+ m_txtctrl->AppendText(m_messages[n]);
+ }
+
+ m_messages.clear();
+}
+
+void MyFrame::UpdateThreadStatus()
+{
+ wxCriticalSectionLocker enter(wxGetApp().m_critsect);
+
+ // update the counts of running/total threads
+ size_t nRunning = 0,
+ nCount = wxGetApp().m_threads.Count();
+ for ( size_t n = 0; n < nCount; n++ )
+ {
+ if ( wxGetApp().m_threads[n]->IsRunning() )
+ nRunning++;
+ }
+
+ if ( nCount != m_nCount || nRunning != m_nRunning )
+ {
+ m_nRunning = nRunning;
+ m_nCount = nCount;
+
+ wxLogStatus(this, wxT("%u threads total, %u running."), unsigned(nCount), unsigned(nRunning));
+ }
+ //else: avoid flicker - don't print anything
+}
+
+bool MyFrame::Cancelled()
+{
+ wxCriticalSectionLocker lock(m_csCancelled);
+
+ return m_cancelled;
+}
+
+// ----------------------------------------------------------------------------
+// MyFrame - event handlers
+// ----------------------------------------------------------------------------
+
void MyFrame::OnStartThreads(wxCommandEvent& WXUNUSED(event) )
{
- static long s_num = 10;
+ static long s_num;
s_num = wxGetNumberFromUser(_T("How many threads to start: "), _T(""),
_T("wxThread sample"), s_num, 1, 10000, this);
return;
}
- size_t count = (size_t)s_num, n;
+ unsigned count = unsigned(s_num), n;
wxArrayThread threads;
threads.Add(thr);
}
+#if wxUSE_STATUSBAR
wxString msg;
msg.Printf(wxT("%d new threads created."), count);
SetStatusText(msg, 1);
+#endif // wxUSE_STATUSBAR
// ...and then start them
for ( n = 0; n < count; n++ )
wxLogError(wxT("Can't start thread!"));
}
+#if wxUSE_STATUSBAR
SetStatusText(_T("New thread started."), 1);
+#endif // wxUSE_STATUSBAR
}
void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) )
{
- wxGetApp().m_critsect.Enter();
+ wxCriticalSectionLocker enter(wxGetApp().m_critsect);
// stop the last thread
if ( wxGetApp().m_threads.IsEmpty() )
{
wxLogError(wxT("No thread to stop!"));
-
- wxGetApp().m_critsect.Leave();
}
else
{
- wxThread *thread = wxGetApp().m_threads.Last();
-
- // it's important to leave critical section before calling Delete()
- // because delete will (implicitly) call OnExit() which also tries
- // to enter the same crit section - would dead lock.
- wxGetApp().m_critsect.Leave();
-
- thread->Delete();
+ wxGetApp().m_threads.Last()->Delete();
- SetStatusText(_T("Thread stopped."), 1);
+#if wxUSE_STATUSBAR
+ SetStatusText(_T("Last thread stopped."), 1);
+#endif // wxUSE_STATUSBAR
}
}
{
wxGetApp().m_threads[n]->Resume();
+#if wxUSE_STATUSBAR
SetStatusText(_T("Thread resumed."), 1);
+#endif // wxUSE_STATUSBAR
}
}
{
wxGetApp().m_threads[n]->Pause();
+#if wxUSE_STATUSBAR
SetStatusText(_T("Thread paused."), 1);
+#endif // wxUSE_STATUSBAR
}
}
-// set the frame title indicating the current number of threads
void MyFrame::OnIdle(wxIdleEvent& event)
{
- wxCriticalSectionLocker enter(wxGetApp().m_critsect);
+ DoLogThreadMessages();
- // update the counts of running/total threads
- size_t nRunning = 0,
- nCount = wxGetApp().m_threads.Count();
- for ( size_t n = 0; n < nCount; n++ )
- {
- if ( wxGetApp().m_threads[n]->IsRunning() )
- nRunning++;
- }
-
- if ( nCount != m_nCount || nRunning != m_nRunning )
- {
- m_nRunning = nRunning;
- m_nCount = nCount;
-
- wxLogStatus(this, wxT("%u threads total, %u running."), nCount, nRunning);
- }
- //else: avoid flicker - don't print anything
+ UpdateThreadStatus();
event.Skip();
}
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event) )
{
- // NB: although the OS will terminate all the threads anyhow when the main
- // one exits, it's good practice to do it ourselves -- even if it's not
- // completely trivial in this example
-
- // tell all the threads to terminate: note that they can't terminate while
- // we're deleting them because they will block in their OnExit() -- this is
- // important as otherwise we might access invalid array elements
- {
- wxGetApp().m_critsect.Enter();
-
- // check if we have any threads running first
- const wxArrayThread& threads = wxGetApp().m_threads;
- size_t count = threads.GetCount();
-
- if ( count )
- {
- // we do, ask them to stop
- for ( size_t n = 0; n < count; n++ )
- {
- threads[n]->Delete();
- }
-
- // set the flag for MyThread::OnExit()
- wxGetApp().m_waitingUntilAllDone = TRUE;
- }
-
- wxGetApp().m_critsect.Leave();
-
- if ( count )
- {
- // now wait for them to really terminate but leave the GUI mutex
- // before doing it as otherwise we might dead lock
- wxMutexGuiLeave();
-
- wxGetApp().m_condAllDone.Wait();
-
- wxMutexGuiEnter();
- }
- //else: no threads to terminate, no condition to wait for
- }
-
- Close(TRUE);
+ Close(true);
}
void MyFrame::OnExecMain(wxCommandEvent& WXUNUSED(event))
{
- wxLogMessage(wxT("The exit code from the main program is %ld"),
- EXEC(_T("/bin/echo \"main program\"")));
-}
-
-void MyFrame::OnExecThread(wxCommandEvent& WXUNUSED(event))
-{
- MyExecThread thread(wxT("/bin/echo \"child thread\""));
- thread.Run();
+ wxString cmd = wxGetTextFromUser("Please enter the command to execute",
+ "Enter command",
+#ifdef __WXMSW__
+ "notepad",
+#else
+ "/bin/echo \"Message from another process\"",
+#endif
+ this);
+ if (cmd.IsEmpty())
+ return; // user clicked cancel
- wxLogMessage(wxT("The exit code from a child thread is %ld"),
- (long)thread.Wait());
+ wxLogMessage(wxT("The exit code from the main program is %ld"),
+ EXEC(cmd));
}
void MyFrame::OnShowCPUs(wxCommandEvent& WXUNUSED(event))
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) )
{
wxMessageDialog dialog(this,
- _T("wxWindows multithreaded application sample\n")
+ _T("wxWidgets multithreaded application sample\n")
_T("(c) 1998 Julian Smart, Guilhem Lavaux\n")
_T("(c) 1999 Vadim Zeitlin\n")
_T("(c) 2000 Robert Roebling"),
if ( thread->Create() != wxTHREAD_NO_ERROR )
{
wxLogError(wxT("Can't create thread!"));
+ return;
}
m_dlgProgress = new wxProgressDialog
);
// thread is not running yet, no need for crit sect
- m_cancelled = FALSE;
+ m_cancelled = false;
thread->Run();
}
-void MyFrame::OnWorkerEvent(wxCommandEvent& event)
+void MyFrame::OnWorkerEvent(wxThreadEvent& event)
{
-#if 0
- WriteText( _T("Got message from worker thread: ") );
- WriteText( event.GetString() );
- WriteText( _T("\n") );
-#else
int n = event.GetInt();
if ( n == -1 )
{
{
if ( !m_dlgProgress->Update(n) )
{
- wxCriticalSectionLocker lock(m_critsectWork);
+ wxCriticalSectionLocker lock(m_csCancelled);
- m_cancelled = TRUE;
+ m_cancelled = true;
}
}
+}
+
+void MyFrame::OnStartGUIThread(wxCommandEvent& WXUNUSED(event))
+{
+ MyImageDialog dlg(this);
+
+ dlg.ShowModal();
+}
+
+
+// ----------------------------------------------------------------------------
+// MyImageDialog
+// ----------------------------------------------------------------------------
+
+BEGIN_EVENT_TABLE(MyImageDialog, wxDialog)
+ EVT_THREAD(GUITHREAD_EVENT, MyImageDialog::OnGUIThreadEvent)
+ EVT_PAINT(MyImageDialog::OnPaint)
+END_EVENT_TABLE()
+
+MyImageDialog::MyImageDialog(wxFrame *parent)
+ : wxDialog(parent, wxID_ANY, "Image created by a secondary thread",
+ wxDefaultPosition, wxSize(GUITHREAD_BMP_SIZE,GUITHREAD_BMP_SIZE)*1.5, wxDEFAULT_DIALOG_STYLE),
+ m_thread(this)
+{
+ m_nCurrentProgress = 0;
+
+ CentreOnScreen();
+
+ // NOTE: no need to lock m_csBmp until the thread isn't started:
+
+ // create the bitmap
+ if (!m_bmp.Create(GUITHREAD_BMP_SIZE,GUITHREAD_BMP_SIZE) || !m_bmp.IsOk())
+ {
+ wxLogError("Couldn't create the bitmap!");
+ return;
+ }
+
+ // clean it
+ wxMemoryDC dc(m_bmp);
+ dc.SetBackground(*wxBLACK_BRUSH);
+ dc.Clear();
+
+ // draw the bitmap from a secondary thread
+ if ( m_thread.Create() != wxTHREAD_NO_ERROR ||
+ m_thread.Run() != wxTHREAD_NO_ERROR )
+ {
+ wxLogError(wxT("Can't create/run thread!"));
+ return;
+ }
+}
+
+MyImageDialog::~MyImageDialog()
+{
+ // in case our thread is still running and for some reason we are destroyed,
+ // do wait for the thread to complete as it assumes that its MyImageDialog
+ // pointer is always valid
+ m_thread.Delete();
+}
+
+void MyImageDialog::OnGUIThreadEvent(wxThreadEvent& event)
+{
+ m_nCurrentProgress = int(((float)event.GetInt()*100)/GUITHREAD_NUM_UPDATES);
+
+ Refresh();
+}
+
+void MyImageDialog::OnPaint(wxPaintEvent& WXUNUSED(evt))
+{
+ wxPaintDC dc(this);
+
+ const wxSize& sz = dc.GetSize();
+
+ {
+ // paint the bitmap
+ wxCriticalSectionLocker locker(m_csBmp);
+ dc.DrawBitmap(m_bmp, (sz.GetWidth()-GUITHREAD_BMP_SIZE)/2,
+ (sz.GetHeight()-GUITHREAD_BMP_SIZE)/2);
+ }
+
+ // paint a sort of progress bar with a 10px border:
+ dc.SetBrush(*wxRED_BRUSH);
+ dc.DrawRectangle(10,10, m_nCurrentProgress*(sz.GetWidth()-20)/100,30);
+ dc.SetTextForeground(*wxBLUE);
+ dc.DrawText(wxString::Format("%d%%", m_nCurrentProgress),
+ (sz.GetWidth()-dc.GetCharWidth()*2)/2,
+ 25-dc.GetCharHeight()/2);
+}
+
+// ----------------------------------------------------------------------------
+// MyThread
+// ----------------------------------------------------------------------------
+
+MyThread::MyThread(MyFrame *frame)
+ : wxThread()
+{
+ m_count = 0;
+ m_frame = frame;
+}
+
+MyThread::~MyThread()
+{
+ wxCriticalSectionLocker locker(wxGetApp().m_critsect);
+
+ wxArrayThread& threads = wxGetApp().m_threads;
+ threads.Remove(this);
+
+ if ( threads.IsEmpty() )
+ {
+ // signal the main thread that there are no more threads left if it is
+ // waiting for us
+ if ( wxGetApp().m_shuttingDown )
+ {
+ wxGetApp().m_shuttingDown = false;
+
+ wxGetApp().m_semAllDone.Post();
+ }
+ }
+}
+
+wxThread::ExitCode MyThread::Entry()
+{
+ wxString text;
+
+ text.Printf(wxT("Thread %p started (priority = %u).\n"),
+ GetId(), GetPriority());
+ WriteText(text);
+ // wxLogMessage(text); -- test wxLog thread safeness
+
+ for ( m_count = 0; m_count < 10; m_count++ )
+ {
+ // check if the application is shutting down: in this case all threads
+ // should stop a.s.a.p.
+ {
+ wxCriticalSectionLocker locker(wxGetApp().m_critsect);
+ if ( wxGetApp().m_shuttingDown )
+ return NULL;
+ }
+
+ // check if just this thread was asked to exit
+ if ( TestDestroy() )
+ break;
+
+ text.Printf(wxT("[%u] Thread %p here.\n"), m_count, GetId());
+ WriteText(text);
+
+ // wxSleep() can't be called from non-GUI thread!
+ wxThread::Sleep(1000);
+ }
+
+ text.Printf(wxT("Thread %p finished.\n"), GetId());
+ WriteText(text);
+ // wxLogMessage(text); -- test wxLog thread safeness
+
+ return NULL;
+}
+
+
+// ----------------------------------------------------------------------------
+// MyWorkerThread
+// ----------------------------------------------------------------------------
+
+// define this symbol to 1 to test if the YieldFor() call in the wxProgressDialog::Update
+// function provokes a race condition in which the second wxThreadEvent posted by
+// MyWorkerThread::Entry is processed by the YieldFor() call of wxProgressDialog::Update
+// and results in the destruction of the progress dialog itself, resulting in a crash later.
+#define TEST_YIELD_RACE_CONDITION 0
+
+MyWorkerThread::MyWorkerThread(MyFrame *frame)
+ : wxThread()
+{
+ m_frame = frame;
+ m_count = 0;
+}
+
+void MyWorkerThread::OnExit()
+{
+}
+
+wxThread::ExitCode MyWorkerThread::Entry()
+{
+#if TEST_YIELD_RACE_CONDITION
+ if ( TestDestroy() )
+ return NULL;
+
+ wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
+
+ event.SetInt( 50 );
+ wxQueueEvent( m_frame, event.Clone() );
+
+ event.SetInt(-1);
+ wxQueueEvent( m_frame, event.Clone() );
+#else
+ for ( m_count = 0; !m_frame->Cancelled() && (m_count < 100); m_count++ )
+ {
+ // check if we were asked to exit
+ if ( TestDestroy() )
+ break;
+
+ // create any type of command event here
+ wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
+ event.SetInt( m_count );
+
+ // send in a thread-safe way
+ wxQueueEvent( m_frame, event.Clone() );
+
+ wxMilliSleep(200);
+ }
+
+ wxThreadEvent event( wxEVT_COMMAND_THREAD, WORKER_EVENT );
+ event.SetInt(-1); // that's all
+ wxQueueEvent( m_frame, event.Clone() );
#endif
+
+ return NULL;
}
-bool MyFrame::Cancelled()
+
+// ----------------------------------------------------------------------------
+// MyGUIThread
+// ----------------------------------------------------------------------------
+
+wxThread::ExitCode MyGUIThread::Entry()
{
- wxCriticalSectionLocker lock(m_critsectWork);
+ for (int i=0; i<GUITHREAD_NUM_UPDATES && !TestDestroy(); i++)
+ {
+ // inform the GUI toolkit that we're going to use GUI functions
+ // from a secondary thread:
+ wxMutexGuiEnter();
- return m_cancelled;
+ {
+ wxCriticalSectionLocker lock(m_dlg->m_csBmp);
+
+ // draw some more stuff on the bitmap
+ wxMemoryDC dc(m_dlg->m_bmp);
+ dc.SetBrush((i%2)==0 ? *wxBLUE_BRUSH : *wxGREEN_BRUSH);
+ dc.DrawRectangle(rand()%GUITHREAD_BMP_SIZE, rand()%GUITHREAD_BMP_SIZE, 30, 30);
+
+ // simulate long drawing time:
+ wxMilliSleep(200);
+ }
+
+ // if we don't release the GUI mutex the MyImageDialog won't be able to refresh
+ wxMutexGuiLeave();
+
+ // notify the dialog that another piece of our masterpiece is complete:
+ wxThreadEvent event( wxEVT_COMMAND_THREAD, GUITHREAD_EVENT );
+ event.SetInt(i+1);
+ wxQueueEvent( m_dlg, event.Clone() );
+
+ // give the main thread the time to refresh before we lock the GUI mutex again
+ // FIXME: find a better way to do this!
+ wxMilliSleep(100);
+ }
+
+ return (ExitCode)0;
}
projects / wxWidgets.git / blobdiff