a3ed46f2c3
git-svn-id: svn://10.65.10.50/branches/R_10_00@23289 c028cbd2-c16b-5b4b-a496-9718f37d4682
791 lines
21 KiB
C++
791 lines
21 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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// RCS-ID: $Id: thread.cpp 41547 2006-10-02 05:36:31Z PC $
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// Copyright: (c) 1998-2002 wxWidgets team
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// Licence: wxWindows license
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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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#include "../sample.xpm"
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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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// Define a new application type
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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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public:
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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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// crit section protects access to all of the arrays below
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wxCriticalSection m_critsect;
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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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// the last exiting thread should post to m_semAllDone if this is true
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// (protected by the same m_critsect)
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bool m_waitingUntilAllDone;
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};
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// Create a new application object
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IMPLEMENT_APP(MyApp)
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// Define a new frame type
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class MyFrame: public wxFrame
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{
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public:
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// ctor
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MyFrame(wxFrame *frame, const wxString& title, int x, int y, int w, int h);
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virtual ~MyFrame();
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// operations
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void WriteText(const wxString& text) { m_txtctrl->WriteText(text); }
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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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// callbacks
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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 OnWorkerEvent(wxCommandEvent& event);
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void OnUpdateWorker(wxUpdateUIEvent& event);
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void OnExecMain(wxCommandEvent& event);
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void OnExecThread(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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private:
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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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// just some place to put our messages in
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wxTextCtrl *m_txtctrl;
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// remember the number of running threads and total number of threads
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size_t m_nRunning, 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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// protects m_cancelled
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wxCriticalSection m_critsectWork;
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DECLARE_EVENT_TABLE()
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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_EXEC_THREAD,
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THREAD_SHOWCPUS,
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WORKER_EVENT // this one gets sent from the worker thread
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};
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// ----------------------------------------------------------------------------
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// GUI 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(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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// write something to the text control
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void WriteText(const wxString& text);
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public:
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unsigned m_count;
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MyFrame *m_frame;
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};
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MyThread::MyThread(MyFrame *frame)
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: wxThread()
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{
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m_count = 0;
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m_frame = frame;
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}
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void MyThread::WriteText(const wxString& text)
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{
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wxString msg;
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// before doing any GUI calls we must ensure that this thread is the only
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// one doing it!
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wxMutexGuiEnter();
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msg << text;
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m_frame->WriteText(msg);
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wxMutexGuiLeave();
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}
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void MyThread::OnExit()
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{
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wxCriticalSectionLocker locker(wxGetApp().m_critsect);
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wxArrayThread& threads = wxGetApp().m_threads;
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threads.Remove(this);
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if ( threads.IsEmpty() )
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{
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// signal the main thread that there are no more threads left if it is
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// waiting for us
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if ( wxGetApp().m_waitingUntilAllDone )
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{
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wxGetApp().m_waitingUntilAllDone = false;
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wxGetApp().m_semAllDone.Post();
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}
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}
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}
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void *MyThread::Entry()
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{
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wxString text;
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text.Printf(wxT("Thread 0x%lx started (priority = %u).\n"),
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GetId(), GetPriority());
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WriteText(text);
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// wxLogMessage(text); -- test wxLog thread safeness
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for ( m_count = 0; m_count < 10; m_count++ )
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{
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// check if we were asked to exit
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if ( TestDestroy() )
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break;
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text.Printf(wxT("[%u] Thread 0x%lx here.\n"), m_count, GetId());
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WriteText(text);
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// wxSleep() can't be called from non-GUI thread!
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wxThread::Sleep(1000);
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}
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text.Printf(wxT("Thread 0x%lx finished.\n"), GetId());
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WriteText(text);
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// wxLogMessage(text); -- test wxLog thread safeness
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return NULL;
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}
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// ----------------------------------------------------------------------------
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// 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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MyWorkerThread::MyWorkerThread(MyFrame *frame)
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: wxThread()
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{
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m_frame = frame;
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m_count = 0;
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}
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void MyWorkerThread::OnExit()
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{
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}
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void *MyWorkerThread::Entry()
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{
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for ( m_count = 0; !m_frame->Cancelled() && (m_count < 100); m_count++ )
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{
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// check if we were asked to exit
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if ( TestDestroy() )
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break;
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// create any type of command event here
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wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT );
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event.SetInt( m_count );
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// send in a thread-safe way
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wxPostEvent( m_frame, event );
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// wxSleep() can't be called from non-main thread!
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wxThread::Sleep(200);
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}
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wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT );
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event.SetInt(-1); // that's all
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wxPostEvent( m_frame, event );
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return NULL;
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}
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// ----------------------------------------------------------------------------
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// a thread which simply calls wxExecute
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// ----------------------------------------------------------------------------
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class MyExecThread : public wxThread
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{
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public:
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MyExecThread(const wxChar *command) : wxThread(wxTHREAD_JOINABLE),
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m_command(command)
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{
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Create();
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}
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virtual ExitCode Entry()
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{
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return (ExitCode)EXEC(m_command);
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}
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private:
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wxString m_command;
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};
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// ----------------------------------------------------------------------------
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// implementation
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// ----------------------------------------------------------------------------
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BEGIN_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_EXEC_MAIN, MyFrame::OnExecMain)
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EVT_MENU(THREAD_EXEC_THREAD, MyFrame::OnExecThread)
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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_MENU(THREAD_START_WORKER, MyFrame::OnStartWorker)
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EVT_MENU(WORKER_EVENT, MyFrame::OnWorkerEvent)
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EVT_IDLE(MyFrame::OnIdle)
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END_EVENT_TABLE()
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MyApp::MyApp()
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: m_semAllDone()
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{
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m_waitingUntilAllDone = 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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// 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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MyFrame *frame = new MyFrame((wxFrame *)NULL, _T("wxWidgets threads sample"),
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50, 50, 450, 340);
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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, _T("&Clear log\tCtrl-L"));
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menuFile->AppendSeparator();
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menuFile->Append(THREAD_QUIT, _T("E&xit\tAlt-X"));
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menuBar->Append(menuFile, _T("&File"));
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wxMenu *menuThread = new wxMenu;
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menuThread->Append(THREAD_START_THREAD, _T("&Start a new thread\tCtrl-N"));
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menuThread->Append(THREAD_START_THREADS, _T("Start &many threads at once"));
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menuThread->Append(THREAD_STOP_THREAD, _T("S&top a running thread\tCtrl-S"));
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menuThread->AppendSeparator();
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menuThread->Append(THREAD_PAUSE_THREAD, _T("&Pause a running thread\tCtrl-P"));
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menuThread->Append(THREAD_RESUME_THREAD, _T("&Resume suspended thread\tCtrl-R"));
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menuThread->AppendSeparator();
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menuThread->Append(THREAD_START_WORKER, _T("Start &worker thread\tCtrl-W"));
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menuBar->Append(menuThread, _T("&Thread"));
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wxMenu *menuExec = new wxMenu;
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menuExec->Append(THREAD_EXEC_MAIN, _T("&Launch a program from main thread\tF5"));
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menuExec->Append(THREAD_EXEC_THREAD, _T("L&aunch a program from a thread\tCtrl-F5"));
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menuBar->Append(menuExec, _T("&Execute"));
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wxMenu *menuHelp = new wxMenu;
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menuHelp->Append(THREAD_SHOWCPUS, _T("&Show CPU count"));
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menuHelp->AppendSeparator();
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menuHelp->Append(THREAD_ABOUT, _T("&About..."));
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menuBar->Append(menuHelp, _T("&Help"));
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frame->SetMenuBar(menuBar);
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// Show the frame
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frame->Show(true);
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SetTopWindow(frame);
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return true;
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}
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// My frame constructor
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MyFrame::MyFrame(wxFrame *frame, const wxString& title,
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int x, int y, int w, int h)
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: wxFrame(frame, wxID_ANY, title, wxPoint(x, y), wxSize(w, h))
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{
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SetIcon(wxIcon(sample_xpm));
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m_nRunning = m_nCount = 0;
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m_dlgProgress = (wxProgressDialog *)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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m_txtctrl = new wxTextCtrl(this, wxID_ANY, _T(""), wxPoint(0, 0), wxSize(0, 0),
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wxTE_MULTILINE | wxTE_READONLY);
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}
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MyFrame::~MyFrame()
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{
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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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wxThread *thread;
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wxGetApp().m_critsect.Enter();
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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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{
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// set the flag for MyThread::OnExit()
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wxGetApp().m_waitingUntilAllDone = true;
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// stop all threads
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while ( ! threads.IsEmpty() )
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{
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thread = threads.Last();
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wxGetApp().m_critsect.Leave();
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thread->Delete();
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wxGetApp().m_critsect.Enter();
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}
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}
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wxGetApp().m_critsect.Leave();
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if ( count )
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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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//else: no threads to terminate, no condition to wait for
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}
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MyThread *MyFrame::CreateThread()
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{
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MyThread *thread = new MyThread(this);
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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::OnStartThreads(wxCommandEvent& WXUNUSED(event) )
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{
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static long s_num;
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s_num = wxGetNumberFromUser(_T("How many threads to start: "), _T(""),
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_T("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(WXTHREAD_MIN_PRIORITY);
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else if ( n == 1 )
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thr->SetPriority(WXTHREAD_MAX_PRIORITY);
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else
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thr->SetPriority(WXTHREAD_DEFAULT_PRIORITY);
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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) )
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{
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MyThread *thread = CreateThread();
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if ( thread->Run() != wxTHREAD_NO_ERROR )
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{
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wxLogError(wxT("Can't start thread!"));
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}
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#if wxUSE_STATUSBAR
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SetStatusText(_T("New thread started."), 1);
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#endif // wxUSE_STATUSBAR
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}
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void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) )
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{
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wxGetApp().m_critsect.Enter();
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// stop the last thread
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if ( wxGetApp().m_threads.IsEmpty() )
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{
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wxLogError(wxT("No thread to stop!"));
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wxGetApp().m_critsect.Leave();
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}
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else
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{
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wxThread *thread = wxGetApp().m_threads.Last();
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// 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();
|
|
|
|
#if wxUSE_STATUSBAR
|
|
SetStatusText(_T("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(_T("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(_T("Thread paused."), 1);
|
|
#endif // wxUSE_STATUSBAR
|
|
}
|
|
}
|
|
|
|
// set the frame title indicating the current number of threads
|
|
void MyFrame::OnIdle(wxIdleEvent& event)
|
|
{
|
|
wxCriticalSectionLocker enter(wxGetApp().m_critsect);
|
|
|
|
// update the counts of running/total threads
|
|
size_t nRunning = 0,
|
|
nCount = wxGetApp().m_threads.Count();
|
|
for ( size_t n = 0; n < nCount; n++ )
|
|
{
|
|
if ( wxGetApp().m_threads[n]->IsRunning() )
|
|
nRunning++;
|
|
}
|
|
|
|
if ( nCount != m_nCount || nRunning != m_nRunning )
|
|
{
|
|
m_nRunning = nRunning;
|
|
m_nCount = nCount;
|
|
|
|
wxLogStatus(this, wxT("%u threads total, %u running."), unsigned(nCount), unsigned(nRunning));
|
|
}
|
|
//else: avoid flicker - don't print anything
|
|
|
|
event.Skip();
|
|
}
|
|
|
|
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event) )
|
|
{
|
|
Close(true);
|
|
}
|
|
|
|
void MyFrame::OnExecMain(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
wxLogMessage(wxT("The exit code from the main program is %ld"),
|
|
EXEC(_T("/bin/echo \"main program\"")));
|
|
}
|
|
|
|
void MyFrame::OnExecThread(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
MyExecThread thread(wxT("/bin/echo \"child thread\""));
|
|
thread.Run();
|
|
|
|
wxLogMessage(wxT("The exit code from a child thread is %ld"),
|
|
(long)thread.Wait());
|
|
}
|
|
|
|
void MyFrame::OnShowCPUs(wxCommandEvent& WXUNUSED(event))
|
|
{
|
|
wxString msg;
|
|
|
|
int nCPUs = wxThread::GetCPUCount();
|
|
switch ( nCPUs )
|
|
{
|
|
case -1:
|
|
msg = _T("Unknown number of CPUs");
|
|
break;
|
|
|
|
case 0:
|
|
msg = _T("WARNING: you're running without any CPUs!");
|
|
break;
|
|
|
|
case 1:
|
|
msg = _T("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,
|
|
_T("wxWidgets multithreaded application sample\n")
|
|
_T("(c) 1998 Julian Smart, Guilhem Lavaux\n")
|
|
_T("(c) 1999 Vadim Zeitlin\n")
|
|
_T("(c) 2000 Robert Roebling"),
|
|
_T("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
|
|
(
|
|
_T("Progress dialog"),
|
|
_T("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( _T("Got message from worker thread: ") );
|
|
WriteText( event.GetString() );
|
|
WriteText( _T("\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;
|
|
}
|