// Licence: wxWindows license
/////////////////////////////////////////////////////////////////////////////
+/*
+ TODO:
+
+ 1. show how SetPriority() works.
+ 2. use worker threads to update progress controls instead of writing
+ messages - it will be more visual
+ */
+
#ifdef __GNUG__
-#pragma implementation "test.cpp"
-#pragma interface "test.cpp"
+ #pragma implementation "test.cpp"
+ #pragma interface "test.cpp"
#endif
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/dynarray.h"
#include "wx/time.h"
+class MyThread;
+WX_DEFINE_ARRAY(wxThread *, wxArrayThread);
+
// Define a new application type
-class MyApp: public wxApp
+class MyApp : public wxApp
{
-public:
- bool OnInit(void);
+ public:
+ // 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;
+ public:
+ bool OnInit();
};
-WX_DEFINE_ARRAY(wxThread *, wxArrayThread);
+// Create a new application object
+IMPLEMENT_APP (MyApp)
// Define a new frame type
class MyFrame: public wxFrame
{
public:
// ctor
- MyFrame(wxFrame *frame, char *title, int x, int y, int w, int h);
+ MyFrame(wxFrame *frame, const wxString& title, int x, int y, int w, int h);
// operations
void WriteText(const wxString& text) { m_txtctrl->WriteText(text); }
// callbacks
void OnQuit(wxCommandEvent& event);
void OnAbout(wxCommandEvent& event);
+ void OnClear(wxCommandEvent& event);
void OnStartThread(wxCommandEvent& event);
+ void OnStartThreads(wxCommandEvent& event);
void OnStopThread(wxCommandEvent& event);
void OnPauseThread(wxCommandEvent& event);
void OnResumeThread(wxCommandEvent& event);
- void OnSize(wxSizeEvent &event);
void OnIdle(wxIdleEvent &event);
- bool OnClose() { return TRUE; }
-
-public:
- wxArrayThread m_threads;
private:
+ // helper function - creates a new thread (but doesn't run it)
+ MyThread *CreateThread();
+
+
+ // just some place to put our messages in
wxTextCtrl *m_txtctrl;
+ // remember the number of running threads and total number of threads
+ size_t m_nRunning, m_nCount;
+
DECLARE_EVENT_TABLE()
};
-class MyThread: public wxThread
+class MyThread : public wxThread
{
public:
MyThread(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();
+
// write something to the text control
void WriteText(const wxString& text);
void MyThread::WriteText(const wxString& text)
{
wxString msg;
- msg << wxTime().FormatTime() << ": " << text;
// before doing any GUI calls we must ensure that this thread is the only
// one doing it!
+
wxMutexGuiEnter();
+
+ msg << wxTime().FormatTime() << ": " << text;
+
m_frame->WriteText(msg);
+
wxMutexGuiLeave();
}
+void MyThread::OnExit()
+{
+ wxCriticalSectionLocker locker(wxGetApp().m_critsect);
+
+ wxGetApp().m_threads.Remove(this);
+}
+
void *MyThread::Entry()
{
wxString text;
- DeferDestroy(TRUE);
-
text.Printf("Thread 0x%x started.\n", GetID());
WriteText(text);
- for ( m_count = 0; m_count < 20; m_count++ )
+ for ( m_count = 0; m_count < 10; m_count++ )
{
// check if we were asked to exit
if ( TestDestroy() )
text.Printf("[%u] Thread 0x%x here.\n", m_count, GetID());
WriteText(text);
- wxSleep(1);
+ // wxSleep() can't be called from non-GUI thread!
+ wxThread::Sleep(1000);
}
text.Printf("Thread 0x%x finished.\n", GetID());
{
TEST_QUIT = 1,
TEST_TEXT = 101,
- TEST_ABOUT = 102,
- TEST_START_THREAD = 103,
- TEST_STOP_THREAD = 104,
- TEST_PAUSE_THREAD = 105,
- TEST_RESUME_THREAD = 106
+ TEST_ABOUT,
+ TEST_CLEAR,
+ TEST_START_THREAD = 201,
+ TEST_START_THREADS,
+ TEST_STOP_THREAD,
+ TEST_PAUSE_THREAD,
+ TEST_RESUME_THREAD
};
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(TEST_QUIT, MyFrame::OnQuit)
EVT_MENU(TEST_ABOUT, MyFrame::OnAbout)
+ EVT_MENU(TEST_CLEAR, MyFrame::OnClear)
EVT_MENU(TEST_START_THREAD, MyFrame::OnStartThread)
+ EVT_MENU(TEST_START_THREADS, MyFrame::OnStartThreads)
EVT_MENU(TEST_STOP_THREAD, MyFrame::OnStopThread)
EVT_MENU(TEST_PAUSE_THREAD, MyFrame::OnPauseThread)
EVT_MENU(TEST_RESUME_THREAD, MyFrame::OnResumeThread)
- EVT_SIZE(MyFrame::OnSize)
-
EVT_IDLE(MyFrame::OnIdle)
END_EVENT_TABLE()
-// Create a new application object
-IMPLEMENT_APP (MyApp)
-
// `Main program' equivalent, creating windows and returning main app frame
bool MyApp::OnInit()
{
// Create the main frame window
- MyFrame *frame = new MyFrame((wxFrame *)NULL, "", 50, 50, 450, 340);
+ MyFrame *frame = new MyFrame((wxFrame *)NULL, "wxWindows threads sample",
+ 50, 50, 450, 340);
// Make a menubar
wxMenu *file_menu = new wxMenu;
+ file_menu->Append(TEST_CLEAR, "&Clear log");
+ file_menu->AppendSeparator();
file_menu->Append(TEST_ABOUT, "&About");
+ file_menu->AppendSeparator();
file_menu->Append(TEST_QUIT, "E&xit");
wxMenuBar *menu_bar = new wxMenuBar;
menu_bar->Append(file_menu, "&File");
wxMenu *thread_menu = new wxMenu;
thread_menu->Append(TEST_START_THREAD, "&Start a new thread");
+ thread_menu->Append(TEST_START_THREADS, "Start &many threads at once");
thread_menu->Append(TEST_STOP_THREAD, "S&top a running thread");
thread_menu->AppendSeparator();
thread_menu->Append(TEST_PAUSE_THREAD, "&Pause a running thread");
}
// My frame constructor
-MyFrame::MyFrame(wxFrame *frame, char *title, int x, int y, int w, int h)
+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))
{
- wxPanel *panel = new wxPanel(this, -1, wxPoint(0, 0), wxSize(400, 200),
- wxTAB_TRAVERSAL);
+ m_nRunning = m_nCount = 0;
- m_txtctrl = new wxTextCtrl(panel, -1, "", wxPoint(10,30), wxSize(390, 190),
- wxTE_MULTILINE);
+ CreateStatusBar(2);
+
+ m_txtctrl = new wxTextCtrl(this, -1, "", wxPoint(0, 0), wxSize(0, 0),
+ wxTE_MULTILINE | wxTE_READONLY);
- (void)new wxStaticText(panel, -1, "Log window", wxPoint(10,10));
}
-void MyFrame::OnStartThread(wxCommandEvent& WXUNUSED(event) )
+MyThread *MyFrame::CreateThread()
{
MyThread *thread = new MyThread(this);
- thread->Create();
+ if ( thread->Create() != wxTHREAD_NO_ERROR )
+ {
+ wxLogError("Can't create thread!");
+ }
+
+ wxCriticalSectionLocker enter(wxGetApp().m_critsect);
+ wxGetApp().m_threads.Add(thread);
- m_threads.Add(thread);
+ return thread;
}
-void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) )
+void MyFrame::OnStartThreads(wxCommandEvent& WXUNUSED(event) )
{
- int no_thrd = m_threads.Count()-1;
+ static wxString s_str;
+ s_str = wxGetTextFromUser("How many threads to start: ",
+ "wxThread sample",
+ s_str, this);
+ if ( s_str.IsEmpty() )
+ return;
- if (no_thrd < 0)
+ size_t count, n;
+ sscanf(s_str, "%u", &count);
+ if ( count == 0 )
return;
- delete m_threads[no_thrd];
- m_threads.Remove(no_thrd);
+ wxArrayThread threads;
+
+ // first create them all...
+ for ( n = 0; n < count; n++ )
+ {
+ threads.Add(CreateThread());
+ }
+
+ wxString msg;
+ msg.Printf("%d new threads created.", count);
+ SetStatusText(msg, 1);
+
+ // ...and then start them
+ for ( n = 0; n < count; n++ )
+ {
+ threads[n]->Run();
+ }
+}
+
+void MyFrame::OnStartThread(wxCommandEvent& WXUNUSED(event) )
+{
+ MyThread *thread = CreateThread();
+
+ if ( thread->Run() != wxTHREAD_NO_ERROR )
+ {
+ wxLogError("Can't start thread!");
+ }
+
+ SetStatusText("New thread started.", 1);
+}
+
+void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) )
+{
+ // stop the last thread
+ if ( wxGetApp().m_threads.IsEmpty() )
+ {
+ wxLogError("No thread to stop!");
+ }
+ else
+ {
+ wxGetApp().m_critsect.Enter();
+
+ 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();
+
+ SetStatusText("Thread stopped.", 1);
+ }
}
void MyFrame::OnResumeThread(wxCommandEvent& WXUNUSED(event) )
{
+ wxCriticalSectionLocker enter(wxGetApp().m_critsect);
+
// resume first suspended thread
- size_t n = 0;
- while ( n < m_threads.Count() && m_threads[n]->IsPaused() )
- n--;
+ size_t n = 0, count = wxGetApp().m_threads.Count();
+ while ( n < count && !wxGetApp().m_threads[n]->IsPaused() )
+ n++;
- if ( n < 0 )
- wxLogError("No thread to pause!");
+ if ( n == count )
+ {
+ wxLogError("No thread to resume!");
+ }
else
- m_threads[n]->Resume();
+ {
+ wxGetApp().m_threads[n]->Resume();
+
+ SetStatusText("Thread resumed.", 1);
+ }
}
void MyFrame::OnPauseThread(wxCommandEvent& WXUNUSED(event) )
{
+ wxCriticalSectionLocker enter(wxGetApp().m_critsect);
+
// pause last running thread
- int n = m_threads.Count() - 1;
- while ( n >= 0 && !m_threads[n]->IsRunning() )
+ int n = wxGetApp().m_threads.Count() - 1;
+ while ( n >= 0 && !wxGetApp().m_threads[n]->IsRunning() )
n--;
if ( n < 0 )
+ {
wxLogError("No thread to pause!");
+ }
else
- m_threads[n]->Pause();
+ {
+ wxGetApp().m_threads[n]->Pause();
+
+ SetStatusText("Thread paused.", 1);
+ }
}
// set the frame title indicating the current number of threads
void MyFrame::OnIdle(wxIdleEvent &event)
{
+ // update the counts of running/total threads
size_t nRunning = 0,
- nCount = m_threads.Count();
+ nCount = wxGetApp().m_threads.Count();
for ( size_t n = 0; n < nCount; n++ )
{
- if ( m_threads[n]->IsRunning() )
+ if ( wxGetApp().m_threads[n]->IsRunning() )
nRunning++;
}
- wxString title;
- title.Printf("wxWindows thread sample (%u threads, %u running).",
- nCount, nRunning);
- SetTitle(title);
-}
-
-void MyFrame::OnSize(wxSizeEvent& event)
-{
- wxFrame::OnSize(event);
-
- wxSize size( GetClientSize() );
+ if ( nCount != m_nCount || nRunning != m_nRunning )
+ {
+ m_nRunning = nRunning;
+ m_nCount = nCount;
- m_txtctrl->SetSize( 10, 30, size.x-20, size.y-40 );
+ wxLogStatus(this, "%u threads total, %u running.", nCount, nRunning);
+ }
+ //else: avoid flicker - don't print anything
}
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event) )
{
- for ( size_t i = 0; i < m_threads.Count(); i++ )
- delete m_threads[i];
+ size_t count = wxGetApp().m_threads.Count();
+ for ( size_t i = 0; i < count; i++ )
+ {
+ wxGetApp().m_threads[0]->Delete();
+ }
Close(TRUE);
}
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) )
{
- wxMessageDialog dialog(this, "wxThread sample (based on minimal)\n"
- "Julian Smart and Guilhem Lavaux",
+ wxMessageDialog dialog(this, "wxWindows multithreaded application sample\n"
+ "(c) 1998 Julian Smart, Guilhem Lavaux\n"
+ "(c) 1999 Vadim Zeitlin",
"About wxThread sample",
wxOK | wxICON_INFORMATION);
dialog.ShowModal();
}
-
+void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
+{
+ m_txtctrl->Clear();
+}
projects / wxWidgets.git / blobdiff