// Created: 06/16/98
// RCS-ID: $Id$
// Copyright: (c) Julian Smart, Markus Holzem, Guilhem Lavaux
-// Licence: wxWindows license
+// 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/wxprec.h"
#ifdef __BORLANDC__
-#pragma hdrstop
+ #pragma hdrstop
#endif
#ifndef WX_PRECOMP
-#include "wx/wx.h"
+ #include "wx/wx.h"
#endif
+#if !wxUSE_THREADS
+ #error "This sample requires thread support!"
+#endif // wxUSE_THREADS
+
#include "wx/thread.h"
#include "wx/dynarray.h"
+#include "wx/time.h"
// Define a new application type
-class MyApp: public wxApp
+class MyApp : public wxApp
{
- public:
- bool OnInit(void);
+public:
+ bool OnInit();
};
-wxMutex text_mutex;
-
-WX_DEFINE_ARRAY(wxThread *,wxArrayThread);
+class MyThread;
+WX_DEFINE_ARRAY(wxThread *, wxArrayThread);
// Define a new frame type
class MyFrame: public wxFrame
{
- public:
- MyFrame(wxFrame *frame, char *title, int x, int y, int w, int h);
-
- public:
+public:
+ // ctor
+ 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);
- bool OnClose(void) { return TRUE; }
+ void OnResumeThread(wxCommandEvent& event);
+
+ void OnIdle(wxIdleEvent &event);
+
+ // called by dying thread _in_that_thread_context_
+ void OnThreadExit(wxThread *thread);
+
+private:
+ // helper function - creates a new thread (but doesn't run it)
+ MyThread *CreateThread();
+
+ // crit section protects access to all of the arrays below
+ wxCriticalSection m_critsect;
+
+ // all the threads currently alive - as soon as the thread terminates, it's
+ // removed from the array
+ wxArrayThread m_threads;
+
+ // just some place to put our messages in
+ wxTextCtrl *m_txtctrl;
- public:
- wxArrayThread m_threads;
- wxTextCtrl *m_txtctrl;
+ // remember the number of running threads and total number of threads
+ size_t m_nRunning, m_nCount;
- DECLARE_EVENT_TABLE()
+ DECLARE_EVENT_TABLE()
};
-class MyThread: public wxThread
+class MyThread : public wxThread
{
- public:
+public:
MyThread(MyFrame *frame);
- void *Entry();
- public:
+ // 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);
+
+public:
+ size_t m_count;
MyFrame *m_frame;
};
MyThread::MyThread(MyFrame *frame)
- : wxThread()
+ : 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!
+ wxMutexGuiLocker guiLocker;
+ msg << wxTime().FormatTime() << ": " << text;
+
+ m_frame->WriteText(msg);
+}
+
+void MyThread::OnExit()
{
- m_frame = frame;
+ m_frame->OnThreadExit(this);
}
void *MyThread::Entry()
{
- wxString text;
+ wxString text;
+
+ text.Printf("Thread 0x%x started.\n", GetID());
+ WriteText(text);
+
+ for ( m_count = 0; m_count < 10; m_count++ )
+ {
+ // check if we were asked to exit
+ if ( TestDestroy() )
+ break;
+
+ text.Printf("[%u] Thread 0x%x here.\n", m_count, GetID());
+ WriteText(text);
- text.Printf("Thread 0x%x: Hello !\n", GetID());
- DeferDestroy(TRUE);
+ // wxSleep() can't be called from non-GUI thread!
+ wxThread::Sleep(1000);
+ }
- while (1) {
- TestDestroy();
- text_mutex.Lock();
- m_frame->m_txtctrl->WriteText(text);
- text_mutex.Unlock();
- wxSleep(1);
- }
-
- return NULL;
+ text.Printf("Thread 0x%x finished.\n", GetID());
+ WriteText(text);
+
+ return NULL;
}
// ID for the menu commands
-#define TEST_QUIT 1
-#define TEST_TEXT 101
-#define TEST_ABOUT 102
-#define TEST_START_THREAD 103
-#define TEST_STOP_THREAD 104
-#define TEST_PAUSE_THREAD 105
+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
+};
BEGIN_EVENT_TABLE(MyFrame, wxFrame)
- EVT_MENU(TEST_QUIT, MyFrame::OnQuit)
- EVT_MENU(TEST_ABOUT, MyFrame::OnAbout)
- EVT_MENU(TEST_START_THREAD, MyFrame::OnStartThread)
- EVT_MENU(TEST_STOP_THREAD, MyFrame::OnStopThread)
- EVT_MENU(TEST_PAUSE_THREAD, MyFrame::OnPauseThread)
+ 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_IDLE(MyFrame::OnIdle)
END_EVENT_TABLE()
// Create a new application object
-IMPLEMENT_APP (MyApp)
+IMPLEMENT_APP (MyApp)
// `Main program' equivalent, creating windows and returning main app frame
-bool MyApp::OnInit(void)
+bool MyApp::OnInit()
{
- // Create the main frame window
- MyFrame *frame = new MyFrame(NULL, "Minimal wxWindows App", 50, 50, 450, 340);
+ // Create the main frame window
+ 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");
+ thread_menu->Append(TEST_RESUME_THREAD, "&Resume suspended thread");
+ menu_bar->Append(thread_menu, "&Thread");
+ frame->SetMenuBar(menu_bar);
+
+ // Show the frame
+ frame->Show(TRUE);
+
+ SetTopWindow(frame);
+
+ return TRUE;
+}
- // Give it an icon
-#ifdef __WXMSW__
- frame->SetIcon(wxIcon("AIAI"));
-#endif
-#ifdef __X__
- frame->SetIcon(wxIcon("aiai.xbm"));
-#endif
+// 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))
+{
+ m_nRunning = m_nCount = 0;
- // Make a menubar
- wxMenu *file_menu = new wxMenu;
+ CreateStatusBar(2);
- file_menu->Append(TEST_ABOUT, "&About");
- file_menu->Append(TEST_QUIT, "E&xit");
- wxMenuBar *menu_bar = new wxMenuBar;
- menu_bar->Append(file_menu, "&File");
+ m_txtctrl = new wxTextCtrl(this, -1, "", wxPoint(0, 0), wxSize(0, 0),
+ wxTE_MULTILINE | wxTE_READONLY);
- wxMenu *thread_menu = new wxMenu;
- thread_menu->Append(TEST_START_THREAD, "Start a new thread");
- thread_menu->Append(TEST_STOP_THREAD, "Stop a running thread");
- thread_menu->Append(TEST_PAUSE_THREAD, "Pause a running thread");
- menu_bar->Append(thread_menu, "Thread");
- frame->SetMenuBar(menu_bar);
+}
- // Make a panel with a message
- wxPanel *panel = new wxPanel(frame, -1, wxPoint(0, 0), wxSize(400, 200), wxTAB_TRAVERSAL);
+MyThread *MyFrame::CreateThread()
+{
+ MyThread *thread = new MyThread(this);
- frame->m_txtctrl = new wxTextCtrl(panel, -1, "", wxPoint(10, 10), wxSize(390, 190),
- wxTE_MULTILINE);
+ if ( thread->Create() != wxTHREAD_NO_ERROR )
+ {
+ wxLogError("Can't create thread!");
+ }
- // Show the frame
- frame->Show(TRUE);
-
- SetTopWindow(frame);
+ wxCriticalSectionLocker enter(m_critsect);
+ m_threads.Add(thread);
- return TRUE;
+ return thread;
}
-// My frame constructor
-MyFrame::MyFrame(wxFrame *frame, char *title, int x, int y, int w, int h):
- wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h))
-{}
+void MyFrame::OnStartThreads(wxCommandEvent& WXUNUSED(event) )
+{
+ static wxString s_str;
+ s_str = wxGetTextFromUser("How many threads to start: ",
+ "wxThread sample",
+ s_str, this);
+ if ( s_str.IsEmpty() )
+ return;
+
+ size_t count, n;
+ sscanf(s_str, "%u", &count);
+ if ( count == 0 )
+ return;
+
+ 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 = new MyThread(this);
+ MyThread *thread = CreateThread();
- thread->Create();
+ if ( thread->Run() != wxTHREAD_NO_ERROR )
+ {
+ wxLogError("Can't start thread!");
+ }
- m_threads.Add(thread);
+ SetStatusText("New thread started.", 1);
}
void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) )
{
- int no_thrd = m_threads.Count()-1;
-
- if (no_thrd < 0)
- return;
+ // stop the last thread
+ if ( m_threads.IsEmpty() )
+ {
+ wxLogError("No thread to stop!");
+ }
+ else
+ {
+ m_critsect.Enter();
+
+ wxThread *thread = m_threads.Last();
+
+ // it's important to leave critical section before calling Delete()
+ // because delete will (implicitly) call OnThreadExit() which also tries
+ // to enter the same crit section - would dead lock.
+ m_critsect.Leave();
+
+ thread->Delete();
+
+ SetStatusText("Thread stopped.", 1);
+ }
+}
- delete (m_threads[no_thrd]);
- m_threads.Remove(no_thrd);
+void MyFrame::OnResumeThread(wxCommandEvent& WXUNUSED(event) )
+{
+ wxCriticalSectionLocker enter(m_critsect);
+
+ // resume first suspended thread
+ size_t n = 0, count = m_threads.Count();
+ while ( n < count && !m_threads[n]->IsPaused() )
+ n++;
+
+ if ( n == count )
+ {
+ wxLogError("No thread to resume!");
+ }
+ else
+ {
+ m_threads[n]->Resume();
+
+ SetStatusText("Thread resumed.", 1);
+ }
}
void MyFrame::OnPauseThread(wxCommandEvent& WXUNUSED(event) )
-{}
+{
+ wxCriticalSectionLocker enter(m_critsect);
+
+ // pause last running thread
+ int n = m_threads.Count() - 1;
+ while ( n >= 0 && !m_threads[n]->IsRunning() )
+ n--;
+
+ if ( n < 0 )
+ {
+ wxLogError("No thread to pause!");
+ }
+ else
+ {
+ 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();
+ for ( size_t n = 0; n < nCount; n++ )
+ {
+ if ( m_threads[n]->IsRunning() )
+ nRunning++;
+ }
+
+ if ( nCount != m_nCount || nRunning != m_nRunning )
+ {
+ m_nRunning = nRunning;
+ m_nCount = nCount;
+
+ wxLogStatus(this, "%u threads total, %u running.", nCount, nRunning);
+ }
+ //else: avoid flicker - don't print anything
+}
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event) )
{
- uint i;
- for (i=0;i<m_threads.Count();i++)
- delete (m_threads[i]);
- Close(TRUE);
+ size_t count = m_threads.Count();
+ for ( size_t i = 0; i < count; i++ )
+ {
+ m_threads[i]->Delete();
+ }
+
+ Close(TRUE);
}
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) )
{
- wxMessageDialog dialog(this, "wxThread sample (based on minimal)\nJulian Smart and Guilhem Lavaux",
- "About wxThread sample", wxYES_NO|wxCANCEL);
+ 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();
+ dialog.ShowModal();
}
+void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
+{
+ m_txtctrl->Clear();
+}
+void MyFrame::OnThreadExit(wxThread *thread)
+{
+ wxCriticalSectionLocker enter(m_critsect);
+
+ m_threads.Remove(thread);
+}
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