#include "wx/dynarray.h"
#include "wx/time.h"
+#include "wx/progdlg.h"
+
+// uncomment this to get some debugging messages from the trace code
+//#define TRACE
+
class MyThread;
WX_DEFINE_ARRAY(wxThread *, wxArrayThread);
// operations
void WriteText(const wxString& text) { m_txtctrl->WriteText(text); }
+ // accessors for MyWorkerThread (called in its context!)
+ bool Cancelled();
+
// callbacks
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
void OnPauseThread(wxCommandEvent& event);
void OnResumeThread(wxCommandEvent& event);
+ void OnStartWorker(wxCommandEvent& event);
+ void OnWorkerEvent(wxCommandEvent& event);
+ void OnUpdateWorker(wxUpdateUIEvent& event);
+
void OnIdle(wxIdleEvent &event);
private:
// remember the number of running threads and total number of threads
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;
+
DECLARE_EVENT_TABLE()
};
+// ID for the menu commands
+enum
+{
+ TEST_QUIT = 1,
+ TEST_TEXT = 101,
+ TEST_ABOUT,
+ TEST_CLEAR,
+ TEST_START_THREAD = 201,
+ TEST_START_THREADS,
+ TEST_STOP_THREAD,
+ TEST_PAUSE_THREAD,
+ TEST_RESUME_THREAD,
+ TEST_START_WORKER,
+ WORKER_EVENT // this one gets sent from the worker thread
+};
+
+//--------------------------------------------------
+// GUI thread
+//--------------------------------------------------
+
class MyThread : public wxThread
{
public:
wxMutexGuiEnter();
msg << text;
-
m_frame->WriteText(msg);
wxMutexGuiLeave();
text.Printf("Thread 0x%x started (priority = %d).\n",
GetId(), GetPriority());
WriteText(text);
+ // wxLogMessage(text); -- test wxLog thread safeness
for ( m_count = 0; m_count < 10; m_count++ )
{
text.Printf("Thread 0x%x finished.\n", GetId());
WriteText(text);
+ // wxLogMessage(text); -- test wxLog thread safeness
return NULL;
}
-// ID for the menu commands
-enum
+//--------------------------------------------------
+// worker thread
+//--------------------------------------------------
+
+class MyWorkerThread : public wxThread
{
- TEST_QUIT = 1,
- TEST_TEXT = 101,
- TEST_ABOUT,
- TEST_CLEAR,
- TEST_START_THREAD = 201,
- TEST_START_THREADS,
- TEST_STOP_THREAD,
- TEST_PAUSE_THREAD,
- TEST_RESUME_THREAD
+public:
+ MyWorkerThread(MyFrame *frame);
+
+ // 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();
+
+public:
+ MyFrame *m_frame;
+ size_t m_count;
};
+MyWorkerThread::MyWorkerThread(MyFrame *frame)
+ : wxThread()
+{
+ m_frame = frame;
+ m_count = 0;
+}
+
+void MyWorkerThread::OnExit()
+{
+}
+
+void *MyWorkerThread::Entry()
+{
+ for ( m_count = 0; !m_frame->Cancelled() && (m_count < 100); m_count++ )
+ {
+ // check if we were asked to exit
+ if ( TestDestroy() )
+ break;
+
+ wxString text;
+ text.Printf("[%u] Thread 0x%x here!!", m_count, GetId());
+
+ // create any type of command event here
+ wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT );
+ event.SetInt( m_count );
+ event.SetString( text );
+
+ // send in a thread-safe way
+ wxPostEvent( m_frame, event );
+
+ // same as:
+ // m_frame->AddPendingEvent( event );
+
+ // wxSleep() can't be called from non-main thread!
+ wxThread::Sleep(200);
+ }
+
+ wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT );
+ event.SetInt(-1); // that's all
+ wxPostEvent( m_frame, event );
+
+ return NULL;
+}
+
+//--------------------------------------------------
+// main program
+//--------------------------------------------------
+
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(TEST_QUIT, MyFrame::OnQuit)
EVT_MENU(TEST_ABOUT, MyFrame::OnAbout)
EVT_MENU(TEST_PAUSE_THREAD, MyFrame::OnPauseThread)
EVT_MENU(TEST_RESUME_THREAD, MyFrame::OnResumeThread)
+ EVT_UPDATE_UI(TEST_START_WORKER, MyFrame::OnUpdateWorker)
+ EVT_MENU(TEST_START_WORKER, MyFrame::OnStartWorker)
+ EVT_MENU(WORKER_EVENT, MyFrame::OnWorkerEvent)
+
EVT_IDLE(MyFrame::OnIdle)
END_EVENT_TABLE()
// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit()
{
+#ifdef TRACE
+ wxLog::AddTraceMask("thread");
+#endif
+
// Create the main frame window
MyFrame *frame = new MyFrame((wxFrame *)NULL, "wxWindows threads sample",
50, 50, 450, 340);
thread_menu->AppendSeparator();
thread_menu->Append(TEST_PAUSE_THREAD, "&Pause a running thread\tCtrl-P");
thread_menu->Append(TEST_RESUME_THREAD, "&Resume suspended thread\tCtrl-R");
+ thread_menu->AppendSeparator();
+ thread_menu->Append(TEST_START_WORKER, "Start &worker thread\tCtrl-W");
+
menu_bar->Append(thread_menu, "&Thread");
frame->SetMenuBar(menu_bar);
{
m_nRunning = m_nCount = 0;
+ m_dlgProgress = (wxProgressDialog *)NULL;
+
CreateStatusBar(2);
m_txtctrl = new wxTextCtrl(this, -1, "", wxPoint(0, 0), wxSize(0, 0),
void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) )
{
+ wxGetApp().m_critsect.Enter();
+
// stop the last thread
if ( wxGetApp().m_threads.IsEmpty() )
{
wxLogError("No thread to stop!");
+
+ wxGetApp().m_critsect.Leave();
}
else
{
- wxGetApp().m_critsect.Enter();
-
wxThread *thread = wxGetApp().m_threads.Last();
// it's important to leave critical section before calling Delete()
{
wxMessageDialog dialog(this, "wxWindows multithreaded application sample\n"
"(c) 1998 Julian Smart, Guilhem Lavaux\n"
- "(c) 1999 Vadim Zeitlin",
+ "(c) 1999 Vadim Zeitlin\n"
+ "(c) 2000 Robert Roebling",
"About wxThread sample",
wxOK | wxICON_INFORMATION);
void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
{
+#ifdef TRACE
+ // log a separator
+ wxLogTrace("-------- log window cleared --------");
+#endif
+
m_txtctrl->Clear();
}
+
+void MyFrame::OnUpdateWorker(wxUpdateUIEvent& event)
+{
+ event.Enable( m_dlgProgress == NULL );
+}
+
+void MyFrame::OnStartWorker(wxCommandEvent& WXUNUSED(event))
+{
+ MyWorkerThread *thread = new MyWorkerThread(this);
+
+ if ( thread->Create() != wxTHREAD_NO_ERROR )
+ {
+ wxLogError("Can't create thread!");
+ }
+
+ m_dlgProgress = new wxProgressDialog
+ (
+ "Progress dialog",
+ "Wait until the thread terminates or press [Cancel]",
+ 100,
+ this,
+ wxPD_CAN_ABORT |
+ wxPD_APP_MODAL |
+ wxPD_ELAPSED_TIME |
+ wxPD_ESTIMATED_TIME |
+ wxPD_REMAINING_TIME
+ );
+
+ // thread is not running yet, no need for crit sect
+ m_cancelled = FALSE;
+
+ thread->Run();
+}
+
+void MyFrame::OnWorkerEvent(wxCommandEvent& event)
+{
+#if 0
+ WriteText( "Got message from worker thread: " );
+ WriteText( event.GetString() );
+ WriteText( "\n" );
+#else
+ int n = event.GetInt();
+ if ( n == -1 )
+ {
+ m_dlgProgress->Destroy();
+ m_dlgProgress = (wxProgressDialog *)NULL;
+
+ // the dialog is aborted because the event came from another thread, so
+ // we may need to wake up the main event loop for the dialog to be
+ // really closed
+ wxWakeUpIdle();
+ }
+ else
+ {
+ if ( !m_dlgProgress->Update(n) )
+ {
+ wxCriticalSectionLocker lock(m_critsectWork);
+
+ m_cancelled = TRUE;
+ }
+ }
+#endif
+}
+
+bool MyFrame::Cancelled()
+{
+ wxCriticalSectionLocker lock(m_critsectWork);
+
+ return m_cancelled;
+}
projects / wxWidgets.git / blobdiff