/////////////////////////////////////////////////////////////////////////////
/*
- TODO:
-
- 1. show how SetPriority() works.
- 2. use worker threads to update progress controls instead of writing
- messages - it will be more visual
+ TODO: use worker threads to update progress controls instead of writing
+ messages - it will be more visual
*/
#ifdef __GNUG__
#include "wx/dynarray.h"
#include "wx/time.h"
+class MyThread;
+WX_DEFINE_ARRAY(wxThread *, wxArrayThread);
+
// Define a new application type
class MyApp : public wxApp
{
public:
- bool OnInit();
+ virtual bool OnInit();
+
+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;
};
-WX_DEFINE_ARRAY(wxThread *, wxArrayThread);
+// Create a new application object
+IMPLEMENT_APP(MyApp)
// Define a new frame type
class MyFrame: public wxFrame
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 OnStartWorker(wxCommandEvent& event);
+ void OnWorkerEvent(wxCommandEvent& event);
void OnIdle(wxIdleEvent &event);
- bool OnClose() { return TRUE; }
-
- // called by dying thread
- void OnThreadExit(wxThread *thread);
-
-public:
- wxArrayThread m_threads;
private:
- // crit section protects access to the array below
- wxCriticalSection m_critsect;
-
- // the array of threads which finished (either because they did their work
- // or because they were explicitly stopped)
- wxArrayInt m_aToDelete;
+ // 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()
};
+// 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:
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!
- wxMutexGuiLocker guiLocker;
+ wxMutexGuiEnter();
+
+ msg << text;
m_frame->WriteText(msg);
+
+ wxMutexGuiLeave();
}
void MyThread::OnExit()
{
- m_frame->OnThreadExit(this);
+ wxCriticalSectionLocker locker(wxGetApp().m_critsect);
+
+ wxGetApp().m_threads.Remove(this);
}
void *MyThread::Entry()
{
wxString text;
- text.Printf("Thread 0x%x started.\n", GetID());
+ text.Printf("Thread 0x%x started (priority = %d).\n",
+ GetId(), GetPriority());
WriteText(text);
for ( m_count = 0; m_count < 10; m_count++ )
if ( TestDestroy() )
break;
- text.Printf("[%u] Thread 0x%x here.\n", m_count, GetID());
+ text.Printf("[%u] Thread 0x%x here.\n", m_count, GetId());
WriteText(text);
// wxSleep() can't be called from non-GUI thread!
wxThread::Sleep(1000);
}
- text.Printf("Thread 0x%x finished.\n", GetID());
+ text.Printf("Thread 0x%x finished.\n", GetId());
WriteText(text);
return NULL;
}
-// ID for the menu commands
-enum
+//--------------------------------------------------
+// worker thread
+//--------------------------------------------------
+
+class MyWorkerThread : public wxThread
{
- TEST_QUIT = 1,
- TEST_TEXT = 101,
- TEST_ABOUT = 102,
- TEST_CLEAR = 103,
- TEST_START_THREAD = 203,
- TEST_STOP_THREAD = 204,
- TEST_PAUSE_THREAD = 205,
- TEST_RESUME_THREAD = 206
+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_count < 10; 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( WORKER_EVENT );
+ 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(1000);
+ }
+
+ return NULL;
+}
+
+//--------------------------------------------------
+// main program
+//--------------------------------------------------
+
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_MENU(TEST_START_WORKER, MyFrame::OnStartWorker)
+ EVT_MENU(WORKER_EVENT, MyFrame::OnWorkerEvent)
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()
{
// Make a menubar
wxMenu *file_menu = new wxMenu;
- file_menu->Append(TEST_CLEAR, "&Clear log");
+ file_menu->Append(TEST_CLEAR, "&Clear log\tCtrl-L");
file_menu->AppendSeparator();
file_menu->Append(TEST_ABOUT, "&About");
file_menu->AppendSeparator();
- file_menu->Append(TEST_QUIT, "E&xit");
+ file_menu->Append(TEST_QUIT, "E&xit\tAlt-X");
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_STOP_THREAD, "S&top a running thread");
+ thread_menu->Append(TEST_START_THREAD, "&Start a new thread\tCtrl-N");
+ thread_menu->Append(TEST_START_THREADS, "Start &many threads at once");
+ thread_menu->Append(TEST_STOP_THREAD, "S&top a running thread\tCtrl-S");
thread_menu->AppendSeparator();
- thread_menu->Append(TEST_PAUSE_THREAD, "&Pause a running thread");
- thread_menu->Append(TEST_RESUME_THREAD, "&Resume suspended thread");
+ 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);
int x, int y, int w, int h)
: wxFrame(frame, -1, title, wxPoint(x, y), wxSize(w, h))
{
- CreateStatusBar();
+ m_nRunning = m_nCount = 0;
+
+ CreateStatusBar(2);
m_txtctrl = new wxTextCtrl(this, -1, "", wxPoint(0, 0), wxSize(0, 0),
wxTE_MULTILINE | wxTE_READONLY);
}
-void MyFrame::OnStartThread(wxCommandEvent& WXUNUSED(event) )
+MyThread *MyFrame::CreateThread()
{
MyThread *thread = new MyThread(this);
wxLogError("Can't create thread!");
}
- wxCriticalSectionLocker enter(m_critsect);
- m_threads.Add(thread);
+ wxCriticalSectionLocker enter(wxGetApp().m_critsect);
+ wxGetApp().m_threads.Add(thread);
+
+ return thread;
+}
+
+void MyFrame::OnStartThreads(wxCommandEvent& WXUNUSED(event) )
+{
+ static long s_num = 10;
+
+ s_num = wxGetNumberFromUser("How many threads to start: ", "",
+ "wxThread sample", s_num, 1, 10000, this);
+ if ( s_num == -1 )
+ {
+ s_num = 10;
+
+ return;
+ }
+
+ size_t count = (size_t)s_num, n;
+
+ wxArrayThread threads;
+
+ // first create them all...
+ for ( n = 0; n < count; n++ )
+ {
+ wxThread *thr = CreateThread();
+
+ // we want to show the effect of SetPriority(): the first thread will
+ // have the lowest priority, the second - the highest, all the rest
+ // the normal one
+ if ( n == 0 )
+ thr->SetPriority(WXTHREAD_MIN_PRIORITY);
+ else if ( n == 1 )
+ thr->SetPriority(WXTHREAD_MAX_PRIORITY);
+ else
+ thr->SetPriority(WXTHREAD_DEFAULT_PRIORITY);
+
+ threads.Add(thr);
+ }
+
+ 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 ( m_threads.IsEmpty() )
+ if ( wxGetApp().m_threads.IsEmpty() )
{
wxLogError("No thread to stop!");
}
else
{
- m_threads.Last()->Delete();
+ 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(m_critsect);
+ wxCriticalSectionLocker enter(wxGetApp().m_critsect);
// resume first suspended thread
- size_t n = 0, count = m_threads.Count();
- while ( n < count && !m_threads[n]->IsPaused() )
+ size_t n = 0, count = wxGetApp().m_threads.Count();
+ while ( n < count && !wxGetApp().m_threads[n]->IsPaused() )
n++;
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(m_critsect);
+ 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)
{
- // first remove from the array all the threads which died since last call
- {
- wxCriticalSectionLocker enter(m_critsect);
-
- size_t nCount = m_aToDelete.Count();
- for ( size_t n = 0; n < nCount; n++ )
- {
- // index should be shifted by n because we've already deleted
- // n-1 elements from the array
- m_threads.Remove((size_t)m_aToDelete[n] - n);
- }
-
- m_aToDelete.Empty();
- }
-
+ // 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++;
}
- wxLogStatus(this, "%u threads total, %u running.", nCount, 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) )
{
- size_t count = m_threads.Count();
+ size_t count = wxGetApp().m_threads.Count();
for ( size_t i = 0; i < count; i++ )
{
- m_threads[i]->Delete();
+ wxGetApp().m_threads[0]->Delete();
}
Close(TRUE);
{
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);
m_txtctrl->Clear();
}
-void MyFrame::OnThreadExit(wxThread *thread)
+void MyFrame::OnStartWorker(wxCommandEvent& WXUNUSED(event))
{
- int index = m_threads.Index(thread);
- wxCHECK_RET( index != -1, "unknown thread being deleted??" );
+ MyWorkerThread *thread = new MyWorkerThread(this);
- wxCriticalSectionLocker enter(m_critsect);
+ if ( thread->Create() != wxTHREAD_NO_ERROR )
+ {
+ wxLogError("Can't create thread!");
+ }
+
+ thread->Run();
+}
- m_aToDelete.Add(index);
+void MyFrame::OnWorkerEvent(wxCommandEvent& event)
+{
+ WriteText( "Got message from worker thread: " );
+ WriteText( event.GetString() );
+ WriteText( "\n" );
}
+
projects / wxWidgets.git / blobdiff