1078 lines
30 KiB
C++
1078 lines
30 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: thread.cpp
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// Purpose: wxWidgets thread sample
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// Author: Guilhem Lavaux, Vadim Zeitlin
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// Modified by:
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// Created: 06/16/98
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// Copyright: (c) 1998-2009 wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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// ============================================================================
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// declarations
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// ============================================================================
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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// For compilers that support precompilation, includes "wx/wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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#ifndef WX_PRECOMP
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#include "wx/wx.h"
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#endif
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#if !wxUSE_THREADS
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#error "This sample requires thread support!"
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#endif // wxUSE_THREADS
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#include "wx/thread.h"
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#include "wx/dynarray.h"
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#include "wx/numdlg.h"
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#include "wx/progdlg.h"
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// ----------------------------------------------------------------------------
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// resources
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// ----------------------------------------------------------------------------
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#include "../sample.xpm"
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// ----------------------------------------------------------------------------
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// private classes
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// ----------------------------------------------------------------------------
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// define this to use wxExecute in the exec tests, otherwise just use system
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#define USE_EXECUTE
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#ifdef USE_EXECUTE
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#define EXEC(cmd) wxExecute((cmd), wxEXEC_SYNC)
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#else
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#define EXEC(cmd) system(cmd)
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#endif
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class MyThread;
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WX_DEFINE_ARRAY_PTR(wxThread *, wxArrayThread);
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// ----------------------------------------------------------------------------
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// the application object
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// ----------------------------------------------------------------------------
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class MyApp : public wxApp
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{
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public:
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MyApp();
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virtual ~MyApp(){};
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virtual bool OnInit();
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// critical section protects access to all of the fields below
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wxCriticalSection m_critsect;
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// all the threads currently alive - as soon as the thread terminates, it's
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// removed from the array
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wxArrayThread m_threads;
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// semaphore used to wait for the threads to exit, see MyFrame::OnQuit()
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wxSemaphore m_semAllDone;
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// indicates that we're shutting down and all threads should exit
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bool m_shuttingDown;
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};
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// ----------------------------------------------------------------------------
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// the main application frame
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// ----------------------------------------------------------------------------
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class MyFrame : public wxFrame,
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private wxLog
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{
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public:
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// ctor
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MyFrame(const wxString& title);
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virtual ~MyFrame();
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// accessors for MyWorkerThread (called in its context!)
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bool Cancelled();
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protected:
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virtual void DoLogRecord(wxLogLevel level,
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const wxString& msg,
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const wxLogRecordInfo& info);
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private:
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// event handlers
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// --------------
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void OnQuit(wxCommandEvent& event);
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void OnClear(wxCommandEvent& event);
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void OnStartThread(wxCommandEvent& event);
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void OnStartThreads(wxCommandEvent& event);
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void OnStopThread(wxCommandEvent& event);
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void OnPauseThread(wxCommandEvent& event);
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void OnResumeThread(wxCommandEvent& event);
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void OnStartWorker(wxCommandEvent& event);
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void OnExecMain(wxCommandEvent& event);
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void OnStartGUIThread(wxCommandEvent& event);
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void OnShowCPUs(wxCommandEvent& event);
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void OnAbout(wxCommandEvent& event);
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void OnIdle(wxIdleEvent &event);
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void OnWorkerEvent(wxThreadEvent& event);
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void OnUpdateWorker(wxUpdateUIEvent& event);
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// logging helper
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void DoLogLine(wxTextCtrl *text,
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const wxString& timestr,
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const wxString& threadstr,
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const wxString& msg);
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// thread helper functions
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// -----------------------
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// helper function - creates a new thread (but doesn't run it)
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MyThread *CreateThread();
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// update display in our status bar: called during idle handling
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void UpdateThreadStatus();
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// internal variables
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// ------------------
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// just some place to put our messages in
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wxTextCtrl *m_txtctrl;
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// old log target, we replace it with one using m_txtctrl during this
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// frame life time
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wxLog *m_oldLogger;
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// the array of pending messages to be displayed and the critical section
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// protecting it
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wxArrayString m_messages;
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wxCriticalSection m_csMessages;
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// remember the number of running threads and total number of threads
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size_t m_nRunning,
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m_nCount;
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// the progress dialog which we show while worker thread is running
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wxProgressDialog *m_dlgProgress;
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// was the worker thread cancelled by user?
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bool m_cancelled;
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wxCriticalSection m_csCancelled; // protects m_cancelled
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wxDECLARE_EVENT_TABLE();
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};
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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// ID for the menu commands
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enum
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{
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THREAD_QUIT = wxID_EXIT,
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THREAD_ABOUT = wxID_ABOUT,
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THREAD_TEXT = 101,
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THREAD_CLEAR,
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THREAD_START_THREAD = 201,
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THREAD_START_THREADS,
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THREAD_STOP_THREAD,
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THREAD_PAUSE_THREAD,
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THREAD_RESUME_THREAD,
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THREAD_START_WORKER,
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THREAD_EXEC_MAIN,
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THREAD_START_GUI_THREAD,
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THREAD_SHOWCPUS,
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WORKER_EVENT = wxID_HIGHEST+1, // this one gets sent from MyWorkerThread
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GUITHREAD_EVENT // this one gets sent from MyGUIThread
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};
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// ----------------------------------------------------------------------------
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// a simple thread
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// ----------------------------------------------------------------------------
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class MyThread : public wxThread
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{
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public:
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MyThread();
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virtual ~MyThread();
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// thread execution starts here
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virtual void *Entry();
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public:
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unsigned m_count;
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};
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// ----------------------------------------------------------------------------
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// a worker thread
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// ----------------------------------------------------------------------------
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class MyWorkerThread : public wxThread
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{
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public:
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MyWorkerThread(MyFrame *frame);
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// thread execution starts here
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virtual void *Entry();
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// called when the thread exits - whether it terminates normally or is
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// stopped with Delete() (but not when it is Kill()ed!)
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virtual void OnExit();
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public:
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MyFrame *m_frame;
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unsigned m_count;
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};
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// ----------------------------------------------------------------------------
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// a thread which executes GUI calls using wxMutexGuiEnter/Leave
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// ----------------------------------------------------------------------------
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#define GUITHREAD_BMP_SIZE 300
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#define GUITHREAD_NUM_UPDATES 50
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class MyImageDialog;
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class MyGUIThread : public wxThread
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{
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public:
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MyGUIThread(MyImageDialog *dlg) : wxThread(wxTHREAD_JOINABLE)
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{
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m_dlg = dlg;
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}
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virtual ExitCode Entry();
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private:
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MyImageDialog *m_dlg;
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};
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// ----------------------------------------------------------------------------
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// an helper dialog used by MyFrame::OnStartGUIThread
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// ----------------------------------------------------------------------------
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class MyImageDialog: public wxDialog
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{
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public:
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// ctor
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MyImageDialog(wxFrame *frame);
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~MyImageDialog();
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// stuff used by MyGUIThread:
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wxBitmap m_bmp; // the bitmap drawn by MyGUIThread
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wxCriticalSection m_csBmp; // protects m_bmp
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private:
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void OnGUIThreadEvent(wxThreadEvent& event);
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void OnPaint(wxPaintEvent&);
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MyGUIThread m_thread;
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int m_nCurrentProgress;
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wxDECLARE_EVENT_TABLE();
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};
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// ============================================================================
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// implementation
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// ============================================================================
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// ----------------------------------------------------------------------------
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// the application class
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// ----------------------------------------------------------------------------
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// Create a new application object
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IMPLEMENT_APP(MyApp)
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MyApp::MyApp()
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{
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m_shuttingDown = false;
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}
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// `Main program' equivalent, creating windows and returning main app frame
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bool MyApp::OnInit()
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{
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if ( !wxApp::OnInit() )
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return false;
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// uncomment this to get some debugging messages from the trace code
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// on the console (or just set WXTRACE env variable to include "thread")
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wxLog::AddTraceMask("thread");
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// Create the main frame window
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new MyFrame("wxWidgets threads sample");
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return true;
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}
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// ----------------------------------------------------------------------------
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// MyFrame
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// ----------------------------------------------------------------------------
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wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
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EVT_MENU(THREAD_QUIT, MyFrame::OnQuit)
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EVT_MENU(THREAD_CLEAR, MyFrame::OnClear)
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EVT_MENU(THREAD_START_THREAD, MyFrame::OnStartThread)
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EVT_MENU(THREAD_START_THREADS, MyFrame::OnStartThreads)
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EVT_MENU(THREAD_STOP_THREAD, MyFrame::OnStopThread)
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EVT_MENU(THREAD_PAUSE_THREAD, MyFrame::OnPauseThread)
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EVT_MENU(THREAD_RESUME_THREAD, MyFrame::OnResumeThread)
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EVT_MENU(THREAD_START_WORKER, MyFrame::OnStartWorker)
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EVT_MENU(THREAD_EXEC_MAIN, MyFrame::OnExecMain)
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EVT_MENU(THREAD_START_GUI_THREAD, MyFrame::OnStartGUIThread)
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EVT_MENU(THREAD_SHOWCPUS, MyFrame::OnShowCPUs)
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EVT_MENU(THREAD_ABOUT, MyFrame::OnAbout)
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EVT_UPDATE_UI(THREAD_START_WORKER, MyFrame::OnUpdateWorker)
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EVT_THREAD(WORKER_EVENT, MyFrame::OnWorkerEvent)
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EVT_IDLE(MyFrame::OnIdle)
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wxEND_EVENT_TABLE()
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// My frame constructor
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MyFrame::MyFrame(const wxString& title)
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: wxFrame(NULL, wxID_ANY, title)
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{
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m_oldLogger = wxLog::GetActiveTarget();
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SetIcon(wxICON(sample));
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// Make a menubar
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wxMenuBar *menuBar = new wxMenuBar;
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wxMenu *menuFile = new wxMenu;
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menuFile->Append(THREAD_CLEAR, wxT("&Clear log\tCtrl-L"));
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menuFile->AppendSeparator();
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menuFile->Append(THREAD_QUIT, wxT("E&xit\tAlt-X"));
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menuBar->Append(menuFile, wxT("&File"));
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wxMenu *menuThread = new wxMenu;
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menuThread->Append(THREAD_START_THREAD, wxT("&Start a new thread\tCtrl-N"));
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menuThread->Append(THREAD_START_THREADS, wxT("Start &many threads at once"));
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menuThread->Append(THREAD_STOP_THREAD, wxT("S&top the last spawned thread\tCtrl-S"));
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menuThread->AppendSeparator();
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menuThread->Append(THREAD_PAUSE_THREAD, wxT("&Pause the last spawned running thread\tCtrl-P"));
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menuThread->Append(THREAD_RESUME_THREAD, wxT("&Resume the first suspended thread\tCtrl-R"));
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menuThread->AppendSeparator();
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menuThread->Append(THREAD_START_WORKER, wxT("Start a &worker thread\tCtrl-W"));
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menuThread->Append(THREAD_EXEC_MAIN, wxT("&Launch a program from main thread\tF5"));
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menuThread->Append(THREAD_START_GUI_THREAD, wxT("Launch a &GUI thread\tF6"));
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menuBar->Append(menuThread, wxT("&Thread"));
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wxMenu *menuHelp = new wxMenu;
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menuHelp->Append(THREAD_SHOWCPUS, wxT("&Show CPU count"));
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menuHelp->AppendSeparator();
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menuHelp->Append(THREAD_ABOUT, wxT("&About"));
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menuBar->Append(menuHelp, wxT("&Help"));
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SetMenuBar(menuBar);
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m_nRunning = m_nCount = 0;
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m_dlgProgress = NULL;
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#if wxUSE_STATUSBAR
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CreateStatusBar(2);
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#endif // wxUSE_STATUSBAR
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// create the logging text control and a header showing the meaning of the
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// different columns
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wxTextCtrl *header = new wxTextCtrl(this, wxID_ANY, "",
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wxDefaultPosition, wxDefaultSize,
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wxTE_READONLY);
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DoLogLine(header, " Time", " Thread", "Message");
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m_txtctrl = new wxTextCtrl(this, wxID_ANY, "",
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wxDefaultPosition, wxDefaultSize,
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wxTE_MULTILINE | wxTE_READONLY);
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wxLog::SetActiveTarget(this);
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// use fixed width font to align output in nice columns
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wxFont font(wxNORMAL_FONT->GetPointSize(), wxFONTFAMILY_TELETYPE,
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wxFONTSTYLE_NORMAL, wxFONTWEIGHT_NORMAL);
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header->SetFont(font);
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m_txtctrl->SetFont(font);
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m_txtctrl->SetFocus();
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// layout and show the frame
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wxBoxSizer *sizer = new wxBoxSizer(wxVERTICAL);
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sizer->Add(header, wxSizerFlags().Expand());
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sizer->Add(m_txtctrl, wxSizerFlags(1).Expand());
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SetSizer(sizer);
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SetSize(600, 350);
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Show();
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}
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MyFrame::~MyFrame()
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{
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wxLog::SetActiveTarget(m_oldLogger);
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// NB: although the OS will terminate all the threads anyhow when the main
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// one exits, it's good practice to do it ourselves -- even if it's not
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// completely trivial in this example
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// tell all the threads to terminate: note that they can't terminate while
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// we're deleting them because they will block in their OnExit() -- this is
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// important as otherwise we might access invalid array elements
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{
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wxCriticalSectionLocker locker(wxGetApp().m_critsect);
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// check if we have any threads running first
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const wxArrayThread& threads = wxGetApp().m_threads;
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size_t count = threads.GetCount();
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if ( !count )
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return;
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// set the flag indicating that all threads should exit
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wxGetApp().m_shuttingDown = true;
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}
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// now wait for them to really terminate
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wxGetApp().m_semAllDone.Wait();
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}
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void
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MyFrame::DoLogLine(wxTextCtrl *text,
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const wxString& timestr,
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const wxString& threadstr,
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const wxString& msg)
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{
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text->AppendText(wxString::Format("%9s %10s %s", timestr, threadstr, msg));
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}
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void
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MyFrame::DoLogRecord(wxLogLevel level,
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const wxString& msg,
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const wxLogRecordInfo& info)
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{
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// let the default GUI logger treat warnings and errors as they should be
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// more noticeable than just another line in the log window and also trace
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// messages as there may be too many of them
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if ( level <= wxLOG_Warning || level == wxLOG_Trace )
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{
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m_oldLogger->LogRecord(level, msg, info);
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return;
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}
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DoLogLine
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(
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m_txtctrl,
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wxDateTime(info.timestamp).FormatISOTime(),
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info.threadId == wxThread::GetMainId()
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? wxString("main")
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: wxString::Format("%lx", info.threadId),
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msg + "\n"
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);
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}
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MyThread *MyFrame::CreateThread()
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{
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MyThread *thread = new MyThread;
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if ( thread->Create() != wxTHREAD_NO_ERROR )
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{
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wxLogError(wxT("Can't create thread!"));
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}
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wxCriticalSectionLocker enter(wxGetApp().m_critsect);
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wxGetApp().m_threads.Add(thread);
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return thread;
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}
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void MyFrame::UpdateThreadStatus()
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{
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wxCriticalSectionLocker enter(wxGetApp().m_critsect);
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// update the counts of running/total threads
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size_t nRunning = 0,
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nCount = wxGetApp().m_threads.Count();
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for ( size_t n = 0; n < nCount; n++ )
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{
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if ( wxGetApp().m_threads[n]->IsRunning() )
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nRunning++;
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}
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if ( nCount != m_nCount || nRunning != m_nRunning )
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{
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m_nRunning = nRunning;
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m_nCount = nCount;
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wxLogStatus(this, wxT("%u threads total, %u running."), unsigned(nCount), unsigned(nRunning));
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}
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//else: avoid flicker - don't print anything
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}
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bool MyFrame::Cancelled()
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{
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wxCriticalSectionLocker lock(m_csCancelled);
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return m_cancelled;
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}
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// ----------------------------------------------------------------------------
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// MyFrame - event handlers
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// ----------------------------------------------------------------------------
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void MyFrame::OnStartThreads(wxCommandEvent& WXUNUSED(event) )
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{
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static long s_num;
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s_num = wxGetNumberFromUser(wxT("How many threads to start: "), wxT(""),
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wxT("wxThread sample"), s_num, 1, 10000, this);
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if ( s_num == -1 )
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{
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s_num = 10;
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return;
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}
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unsigned count = unsigned(s_num), n;
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wxArrayThread threads;
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// first create them all...
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for ( n = 0; n < count; n++ )
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{
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wxThread *thr = CreateThread();
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// we want to show the effect of SetPriority(): the first thread will
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// have the lowest priority, the second - the highest, all the rest
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// the normal one
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if ( n == 0 )
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thr->SetPriority(wxPRIORITY_MIN);
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else if ( n == 1 )
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thr->SetPriority(wxPRIORITY_MAX);
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else
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thr->SetPriority(wxPRIORITY_DEFAULT);
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threads.Add(thr);
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}
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#if wxUSE_STATUSBAR
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wxString msg;
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msg.Printf(wxT("%d new threads created."), count);
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SetStatusText(msg, 1);
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#endif // wxUSE_STATUSBAR
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// ...and then start them
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for ( n = 0; n < count; n++ )
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{
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threads[n]->Run();
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}
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}
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void MyFrame::OnStartThread(wxCommandEvent& WXUNUSED(event) )
|
|
{
|
|
MyThread *thread = CreateThread();
|
|
|
|
if ( thread->Run() != wxTHREAD_NO_ERROR )
|
|
{
|
|
wxLogError(wxT("Can't start thread!"));
|
|
}
|
|
|
|
#if wxUSE_STATUSBAR
|
|
SetStatusText(wxT("New thread started."), 1);
|
|
#endif // wxUSE_STATUSBAR
|
|
}
|
|
|
|
void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) )
|
|
{
|
|
wxThread* toDelete = NULL;
|
|
{
|
|
wxCriticalSectionLocker enter(wxGetApp().m_critsect);
|
|
|
|
// stop the last thread
|
|
if ( wxGetApp().m_threads.IsEmpty() )
|
|
{
|
|
wxLogError(wxT("No thread to stop!"));
|
|
}
|
|
else
|
|
{
|
|
toDelete = wxGetApp().m_threads.Last();
|
|
}
|
|
}
|
|
|
|
if ( toDelete )
|
|
{
|
|
// This can still crash if the thread gets to delete itself
|
|
// in the mean time.
|
|
toDelete->Delete();
|
|
|
|
#if wxUSE_STATUSBAR
|
|
SetStatusText(wxT("Last thread stopped."), 1);
|
|
#endif // wxUSE_STATUSBAR
|
|
}
|
|
}
|
|
|
|
void MyFrame::OnResumeThread(wxCommandEvent& WXUNUSED(event) )
|
|
{
|
|
wxCriticalSectionLocker enter(wxGetApp().m_critsect);
|
|
|
|
// resume first suspended thread
|
|
size_t n = 0, count = wxGetApp().m_threads.Count();
|
|
while ( n < count && !wxGetApp().m_threads[n]->IsPaused() )
|
|
n++;
|
|
|
|
if ( n == count )
|
|
{
|
|
wxLogError(wxT("No thread to resume!"));
|
|
}
|
|
else
|
|
{
|
|
wxGetApp().m_threads[n]->Resume();
|
|
|
|
#if wxUSE_STATUSBAR
|
|
SetStatusText(wxT("Thread resumed."), 1);
|
|
#endif // wxUSE_STATUSBAR
|
|
}
|
|
}
|
|
|
|
void MyFrame::OnPauseThread(wxCommandEvent& WXUNUSED(event) )
|
|
{
|
|
wxCriticalSectionLocker enter(wxGetApp().m_critsect);
|
|
|
|
// pause last running thread
|
|
int n = wxGetApp().m_threads.Count() - 1;
|
|
while ( n >= 0 && !wxGetApp().m_threads[n]->IsRunning() )
|
|
n--;
|
|
|
|
if ( n < 0 )
|
|
{
|
|
wxLogError(wxT("No thread to pause!"));
|
|
}
|
|
else
|
|
{
|
|
wxGetApp().m_threads[n]->Pause();
|
|
|
|
#if wxUSE_STATUSBAR
|
|
SetStatusText(wxT("Thread paused."), 1);
|
|
#endif // wxUSE_STATUSBAR
|
|
}
|
|
}
|
|
|
|
void MyFrame::OnIdle(wxIdleEvent& event)
|
|
{
|
|
UpdateThreadStatus();
|
|
|
|
event.Skip();
|
|
}
|
|
|
|
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event) )
|
|
{
|
|
Close(true);
|
|
}
|
|
|
|
void MyFrame::OnExecMain(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
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 the main program is %ld"),
|
|
EXEC(cmd));
|
|
}
|
|
|
|
void MyFrame::OnShowCPUs(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
wxString msg;
|
|
|
|
int nCPUs = wxThread::GetCPUCount();
|
|
switch ( nCPUs )
|
|
{
|
|
case -1:
|
|
msg = wxT("Unknown number of CPUs");
|
|
break;
|
|
|
|
case 0:
|
|
msg = wxT("WARNING: you're running without any CPUs!");
|
|
break;
|
|
|
|
case 1:
|
|
msg = wxT("This system only has one CPU.");
|
|
break;
|
|
|
|
default:
|
|
msg.Printf(wxT("This system has %d CPUs"), nCPUs);
|
|
}
|
|
|
|
wxLogMessage(msg);
|
|
}
|
|
|
|
void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) )
|
|
{
|
|
wxMessageDialog dialog(this,
|
|
wxT("wxWidgets multithreaded application sample\n")
|
|
wxT("(c) 1998 Julian Smart, Guilhem Lavaux\n")
|
|
wxT("(c) 2000 Robert Roebling\n")
|
|
wxT("(c) 1999,2009 Vadim Zeitlin"),
|
|
wxT("About wxThread sample"),
|
|
wxOK | wxICON_INFORMATION);
|
|
|
|
dialog.ShowModal();
|
|
}
|
|
|
|
void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
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(wxT("Can't create thread!"));
|
|
return;
|
|
}
|
|
|
|
m_dlgProgress = new wxProgressDialog
|
|
(
|
|
wxT("Progress dialog"),
|
|
wxT("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(wxThreadEvent& event)
|
|
{
|
|
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_csCancelled);
|
|
|
|
m_cancelled = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
void MyFrame::OnStartGUIThread(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
// we use this to check that disabling logging only affects the main thread
|
|
// but the messages from the worker thread will still be logged
|
|
wxLogNull noLog;
|
|
wxLogMessage("You shouldn't see this message because of wxLogNull");
|
|
|
|
MyImageDialog dlg(this);
|
|
|
|
dlg.ShowModal();
|
|
}
|
|
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// MyImageDialog
|
|
// ----------------------------------------------------------------------------
|
|
|
|
wxBEGIN_EVENT_TABLE(MyImageDialog, wxDialog)
|
|
EVT_THREAD(GUITHREAD_EVENT, MyImageDialog::OnGUIThreadEvent)
|
|
EVT_PAINT(MyImageDialog::OnPaint)
|
|
wxEND_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()
|
|
: wxThread()
|
|
{
|
|
m_count = 0;
|
|
}
|
|
|
|
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()
|
|
{
|
|
wxLogMessage("Thread started (priority = %u).", GetPriority());
|
|
|
|
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;
|
|
|
|
wxLogMessage("Thread progress: %u", m_count);
|
|
|
|
// wxSleep() can't be called from non-GUI thread!
|
|
wxThread::Sleep(1000);
|
|
}
|
|
|
|
wxLogMessage("Thread finished.");
|
|
|
|
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_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_THREAD, WORKER_EVENT );
|
|
event.SetInt( m_count );
|
|
|
|
// send in a thread-safe way
|
|
wxQueueEvent( m_frame, event.Clone() );
|
|
|
|
wxMilliSleep(200);
|
|
}
|
|
|
|
wxThreadEvent event( wxEVT_THREAD, WORKER_EVENT );
|
|
event.SetInt(-1); // that's all
|
|
wxQueueEvent( m_frame, event.Clone() );
|
|
#endif
|
|
|
|
return NULL;
|
|
}
|
|
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// MyGUIThread
|
|
// ----------------------------------------------------------------------------
|
|
|
|
wxThread::ExitCode MyGUIThread::Entry()
|
|
{
|
|
// uncomment this to check that disabling logging here does disable it for
|
|
// this thread -- but not the main one if you also comment out wxLogNull
|
|
// line in MyFrame::OnStartGUIThread()
|
|
//wxLogNull noLog;
|
|
|
|
// this goes to the main window
|
|
wxLogMessage("GUI thread starting");
|
|
|
|
// use a thread-specific log target for this thread to show that its
|
|
// messages don't appear in the main window while it runs
|
|
wxLogBuffer logBuf;
|
|
wxLog::SetThreadActiveTarget(&logBuf);
|
|
|
|
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();
|
|
|
|
{
|
|
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_THREAD, GUITHREAD_EVENT );
|
|
event.SetInt(i+1);
|
|
wxQueueEvent( m_dlg, event.Clone() );
|
|
|
|
if ( !((i + 1) % 10) )
|
|
{
|
|
// this message will go to the buffer
|
|
wxLogMessage("Step #%d.", i + 1);
|
|
}
|
|
|
|
// 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);
|
|
}
|
|
|
|
// now remove the thread-specific thread target
|
|
wxLog::SetThreadActiveTarget(NULL);
|
|
|
|
// so that this goes to the main window again
|
|
wxLogMessage("GUI thread finished.");
|
|
|
|
return (ExitCode)0;
|
|
}
|