| 1 | ///////////////////////////////////////////////////////////////////////////// |
| 2 | // Name: thread.cpp |
| 3 | // Purpose: wxWidgets thread sample |
| 4 | // Author: Guilhem Lavaux, Vadim Zeitlin |
| 5 | // Modified by: |
| 6 | // Created: 06/16/98 |
| 7 | // RCS-ID: $Id$ |
| 8 | // Copyright: (c) 1998-2002 wxWidgets team |
| 9 | // Licence: wxWindows license |
| 10 | ///////////////////////////////////////////////////////////////////////////// |
| 11 | |
| 12 | // For compilers that support precompilation, includes "wx/wx.h". |
| 13 | #include "wx/wxprec.h" |
| 14 | |
| 15 | #ifdef __BORLANDC__ |
| 16 | #pragma hdrstop |
| 17 | #endif |
| 18 | |
| 19 | #ifndef WX_PRECOMP |
| 20 | #include "wx/wx.h" |
| 21 | #endif |
| 22 | |
| 23 | #if !wxUSE_THREADS |
| 24 | #error "This sample requires thread support!" |
| 25 | #endif // wxUSE_THREADS |
| 26 | |
| 27 | #include "wx/thread.h" |
| 28 | #include "wx/dynarray.h" |
| 29 | #include "wx/numdlg.h" |
| 30 | |
| 31 | #include "wx/progdlg.h" |
| 32 | |
| 33 | // define this to use wxExecute in the exec tests, otherwise just use system |
| 34 | #define USE_EXECUTE |
| 35 | |
| 36 | #ifdef USE_EXECUTE |
| 37 | #define EXEC(cmd) wxExecute((cmd), wxEXEC_SYNC) |
| 38 | #else |
| 39 | #define EXEC(cmd) system(cmd) |
| 40 | #endif |
| 41 | |
| 42 | class MyThread; |
| 43 | WX_DEFINE_ARRAY_PTR(wxThread *, wxArrayThread); |
| 44 | |
| 45 | // Define a new application type |
| 46 | class MyApp : public wxApp |
| 47 | { |
| 48 | public: |
| 49 | MyApp(); |
| 50 | virtual ~MyApp(){}; |
| 51 | |
| 52 | virtual bool OnInit(); |
| 53 | |
| 54 | public: |
| 55 | // all the threads currently alive - as soon as the thread terminates, it's |
| 56 | // removed from the array |
| 57 | wxArrayThread m_threads; |
| 58 | |
| 59 | // crit section protects access to all of the arrays below |
| 60 | wxCriticalSection m_critsect; |
| 61 | |
| 62 | // semaphore used to wait for the threads to exit, see MyFrame::OnQuit() |
| 63 | wxSemaphore m_semAllDone; |
| 64 | |
| 65 | // the last exiting thread should post to m_semAllDone if this is true |
| 66 | // (protected by the same m_critsect) |
| 67 | bool m_waitingUntilAllDone; |
| 68 | }; |
| 69 | |
| 70 | // Create a new application object |
| 71 | IMPLEMENT_APP(MyApp) |
| 72 | |
| 73 | // Define a new frame type |
| 74 | class MyFrame: public wxFrame |
| 75 | { |
| 76 | public: |
| 77 | // ctor |
| 78 | MyFrame(wxFrame *frame, const wxString& title, int x, int y, int w, int h); |
| 79 | virtual ~MyFrame(); |
| 80 | |
| 81 | // operations |
| 82 | void WriteText(const wxString& text) { m_txtctrl->WriteText(text); } |
| 83 | |
| 84 | // accessors for MyWorkerThread (called in its context!) |
| 85 | bool Cancelled(); |
| 86 | |
| 87 | protected: |
| 88 | // callbacks |
| 89 | void OnQuit(wxCommandEvent& event); |
| 90 | void OnClear(wxCommandEvent& event); |
| 91 | |
| 92 | void OnStartThread(wxCommandEvent& event); |
| 93 | void OnStartThreads(wxCommandEvent& event); |
| 94 | void OnStopThread(wxCommandEvent& event); |
| 95 | void OnPauseThread(wxCommandEvent& event); |
| 96 | void OnResumeThread(wxCommandEvent& event); |
| 97 | |
| 98 | void OnStartWorker(wxCommandEvent& event); |
| 99 | void OnWorkerEvent(wxCommandEvent& event); |
| 100 | void OnUpdateWorker(wxUpdateUIEvent& event); |
| 101 | |
| 102 | void OnExecMain(wxCommandEvent& event); |
| 103 | void OnExecThread(wxCommandEvent& event); |
| 104 | |
| 105 | void OnShowCPUs(wxCommandEvent& event); |
| 106 | void OnAbout(wxCommandEvent& event); |
| 107 | |
| 108 | void OnIdle(wxIdleEvent &event); |
| 109 | |
| 110 | private: |
| 111 | // helper function - creates a new thread (but doesn't run it) |
| 112 | MyThread *CreateThread(); |
| 113 | |
| 114 | // just some place to put our messages in |
| 115 | wxTextCtrl *m_txtctrl; |
| 116 | |
| 117 | // remember the number of running threads and total number of threads |
| 118 | size_t m_nRunning, m_nCount; |
| 119 | |
| 120 | // the progress dialog which we show while worker thread is running |
| 121 | wxProgressDialog *m_dlgProgress; |
| 122 | |
| 123 | // was the worker thread cancelled by user? |
| 124 | bool m_cancelled; |
| 125 | |
| 126 | // protects m_cancelled |
| 127 | wxCriticalSection m_critsectWork; |
| 128 | |
| 129 | DECLARE_EVENT_TABLE() |
| 130 | }; |
| 131 | |
| 132 | // ID for the menu commands |
| 133 | enum |
| 134 | { |
| 135 | THREAD_QUIT = 1, |
| 136 | THREAD_TEXT = 101, |
| 137 | THREAD_CLEAR, |
| 138 | THREAD_START_THREAD = 201, |
| 139 | THREAD_START_THREADS, |
| 140 | THREAD_STOP_THREAD, |
| 141 | THREAD_PAUSE_THREAD, |
| 142 | THREAD_RESUME_THREAD, |
| 143 | THREAD_START_WORKER, |
| 144 | |
| 145 | THREAD_EXEC_MAIN, |
| 146 | THREAD_EXEC_THREAD, |
| 147 | |
| 148 | THREAD_SHOWCPUS, |
| 149 | THREAD_ABOUT, |
| 150 | |
| 151 | WORKER_EVENT // this one gets sent from the worker thread |
| 152 | }; |
| 153 | |
| 154 | // ---------------------------------------------------------------------------- |
| 155 | // GUI thread |
| 156 | // ---------------------------------------------------------------------------- |
| 157 | |
| 158 | class MyThread : public wxThread |
| 159 | { |
| 160 | public: |
| 161 | MyThread(MyFrame *frame); |
| 162 | |
| 163 | // thread execution starts here |
| 164 | virtual void *Entry(); |
| 165 | |
| 166 | // called when the thread exits - whether it terminates normally or is |
| 167 | // stopped with Delete() (but not when it is Kill()ed!) |
| 168 | virtual void OnExit(); |
| 169 | |
| 170 | // write something to the text control |
| 171 | void WriteText(const wxString& text); |
| 172 | |
| 173 | public: |
| 174 | size_t m_count; |
| 175 | MyFrame *m_frame; |
| 176 | }; |
| 177 | |
| 178 | MyThread::MyThread(MyFrame *frame) |
| 179 | : wxThread() |
| 180 | { |
| 181 | m_count = 0; |
| 182 | m_frame = frame; |
| 183 | } |
| 184 | |
| 185 | void MyThread::WriteText(const wxString& text) |
| 186 | { |
| 187 | wxString msg; |
| 188 | |
| 189 | // before doing any GUI calls we must ensure that this thread is the only |
| 190 | // one doing it! |
| 191 | |
| 192 | wxMutexGuiEnter(); |
| 193 | |
| 194 | msg << text; |
| 195 | m_frame->WriteText(msg); |
| 196 | |
| 197 | wxMutexGuiLeave(); |
| 198 | } |
| 199 | |
| 200 | void MyThread::OnExit() |
| 201 | { |
| 202 | wxCriticalSectionLocker locker(wxGetApp().m_critsect); |
| 203 | |
| 204 | wxArrayThread& threads = wxGetApp().m_threads; |
| 205 | threads.Remove(this); |
| 206 | |
| 207 | if ( threads.IsEmpty() ) |
| 208 | { |
| 209 | // signal the main thread that there are no more threads left if it is |
| 210 | // waiting for us |
| 211 | if ( wxGetApp().m_waitingUntilAllDone ) |
| 212 | { |
| 213 | wxGetApp().m_waitingUntilAllDone = false; |
| 214 | |
| 215 | wxGetApp().m_semAllDone.Post(); |
| 216 | } |
| 217 | } |
| 218 | } |
| 219 | |
| 220 | void *MyThread::Entry() |
| 221 | { |
| 222 | wxString text; |
| 223 | |
| 224 | text.Printf(wxT("Thread 0x%lx started (priority = %u).\n"), |
| 225 | GetId(), GetPriority()); |
| 226 | WriteText(text); |
| 227 | // wxLogMessage(text); -- test wxLog thread safeness |
| 228 | |
| 229 | for ( m_count = 0; m_count < 10; m_count++ ) |
| 230 | { |
| 231 | // check if we were asked to exit |
| 232 | if ( TestDestroy() ) |
| 233 | break; |
| 234 | |
| 235 | text.Printf(wxT("[%u] Thread 0x%lx here.\n"), m_count, GetId()); |
| 236 | WriteText(text); |
| 237 | |
| 238 | // wxSleep() can't be called from non-GUI thread! |
| 239 | wxThread::Sleep(1000); |
| 240 | } |
| 241 | |
| 242 | text.Printf(wxT("Thread 0x%lx finished.\n"), GetId()); |
| 243 | WriteText(text); |
| 244 | // wxLogMessage(text); -- test wxLog thread safeness |
| 245 | |
| 246 | return NULL; |
| 247 | } |
| 248 | |
| 249 | // ---------------------------------------------------------------------------- |
| 250 | // worker thread |
| 251 | // ---------------------------------------------------------------------------- |
| 252 | |
| 253 | class MyWorkerThread : public wxThread |
| 254 | { |
| 255 | public: |
| 256 | MyWorkerThread(MyFrame *frame); |
| 257 | |
| 258 | // thread execution starts here |
| 259 | virtual void *Entry(); |
| 260 | |
| 261 | // called when the thread exits - whether it terminates normally or is |
| 262 | // stopped with Delete() (but not when it is Kill()ed!) |
| 263 | virtual void OnExit(); |
| 264 | |
| 265 | public: |
| 266 | MyFrame *m_frame; |
| 267 | size_t m_count; |
| 268 | }; |
| 269 | |
| 270 | MyWorkerThread::MyWorkerThread(MyFrame *frame) |
| 271 | : wxThread() |
| 272 | { |
| 273 | m_frame = frame; |
| 274 | m_count = 0; |
| 275 | } |
| 276 | |
| 277 | void MyWorkerThread::OnExit() |
| 278 | { |
| 279 | } |
| 280 | |
| 281 | void *MyWorkerThread::Entry() |
| 282 | { |
| 283 | for ( m_count = 0; !m_frame->Cancelled() && (m_count < 100); m_count++ ) |
| 284 | { |
| 285 | // check if we were asked to exit |
| 286 | if ( TestDestroy() ) |
| 287 | break; |
| 288 | |
| 289 | // create any type of command event here |
| 290 | wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT ); |
| 291 | event.SetInt( m_count ); |
| 292 | |
| 293 | // send in a thread-safe way |
| 294 | wxPostEvent( m_frame, event ); |
| 295 | |
| 296 | // wxSleep() can't be called from non-main thread! |
| 297 | wxThread::Sleep(200); |
| 298 | } |
| 299 | |
| 300 | wxCommandEvent event( wxEVT_COMMAND_MENU_SELECTED, WORKER_EVENT ); |
| 301 | event.SetInt(-1); // that's all |
| 302 | wxPostEvent( m_frame, event ); |
| 303 | |
| 304 | return NULL; |
| 305 | } |
| 306 | |
| 307 | // ---------------------------------------------------------------------------- |
| 308 | // a thread which simply calls wxExecute |
| 309 | // ---------------------------------------------------------------------------- |
| 310 | |
| 311 | class MyExecThread : public wxThread |
| 312 | { |
| 313 | public: |
| 314 | MyExecThread(const wxChar *command) : wxThread(wxTHREAD_JOINABLE), |
| 315 | m_command(command) |
| 316 | { |
| 317 | Create(); |
| 318 | } |
| 319 | |
| 320 | virtual ExitCode Entry() |
| 321 | { |
| 322 | return (ExitCode)EXEC(m_command); |
| 323 | } |
| 324 | |
| 325 | private: |
| 326 | wxString m_command; |
| 327 | }; |
| 328 | |
| 329 | // ---------------------------------------------------------------------------- |
| 330 | // implementation |
| 331 | // ---------------------------------------------------------------------------- |
| 332 | |
| 333 | BEGIN_EVENT_TABLE(MyFrame, wxFrame) |
| 334 | EVT_MENU(THREAD_QUIT, MyFrame::OnQuit) |
| 335 | EVT_MENU(THREAD_CLEAR, MyFrame::OnClear) |
| 336 | EVT_MENU(THREAD_START_THREAD, MyFrame::OnStartThread) |
| 337 | EVT_MENU(THREAD_START_THREADS, MyFrame::OnStartThreads) |
| 338 | EVT_MENU(THREAD_STOP_THREAD, MyFrame::OnStopThread) |
| 339 | EVT_MENU(THREAD_PAUSE_THREAD, MyFrame::OnPauseThread) |
| 340 | EVT_MENU(THREAD_RESUME_THREAD, MyFrame::OnResumeThread) |
| 341 | |
| 342 | EVT_MENU(THREAD_EXEC_MAIN, MyFrame::OnExecMain) |
| 343 | EVT_MENU(THREAD_EXEC_THREAD, MyFrame::OnExecThread) |
| 344 | |
| 345 | EVT_MENU(THREAD_SHOWCPUS, MyFrame::OnShowCPUs) |
| 346 | EVT_MENU(THREAD_ABOUT, MyFrame::OnAbout) |
| 347 | |
| 348 | EVT_UPDATE_UI(THREAD_START_WORKER, MyFrame::OnUpdateWorker) |
| 349 | EVT_MENU(THREAD_START_WORKER, MyFrame::OnStartWorker) |
| 350 | EVT_MENU(WORKER_EVENT, MyFrame::OnWorkerEvent) |
| 351 | |
| 352 | EVT_IDLE(MyFrame::OnIdle) |
| 353 | END_EVENT_TABLE() |
| 354 | |
| 355 | MyApp::MyApp() |
| 356 | : m_semAllDone() |
| 357 | { |
| 358 | m_waitingUntilAllDone = false; |
| 359 | } |
| 360 | |
| 361 | // `Main program' equivalent, creating windows and returning main app frame |
| 362 | bool MyApp::OnInit() |
| 363 | { |
| 364 | // uncomment this to get some debugging messages from the trace code |
| 365 | // on the console (or just set WXTRACE env variable to include "thread") |
| 366 | //wxLog::AddTraceMask("thread"); |
| 367 | |
| 368 | // Create the main frame window |
| 369 | MyFrame *frame = new MyFrame((wxFrame *)NULL, _T("wxWidgets threads sample"), |
| 370 | 50, 50, 450, 340); |
| 371 | |
| 372 | // Make a menubar |
| 373 | wxMenuBar *menuBar = new wxMenuBar; |
| 374 | |
| 375 | wxMenu *menuFile = new wxMenu; |
| 376 | menuFile->Append(THREAD_CLEAR, _T("&Clear log\tCtrl-L")); |
| 377 | menuFile->AppendSeparator(); |
| 378 | menuFile->Append(THREAD_QUIT, _T("E&xit\tAlt-X")); |
| 379 | menuBar->Append(menuFile, _T("&File")); |
| 380 | |
| 381 | wxMenu *menuThread = new wxMenu; |
| 382 | menuThread->Append(THREAD_START_THREAD, _T("&Start a new thread\tCtrl-N")); |
| 383 | menuThread->Append(THREAD_START_THREADS, _T("Start &many threads at once")); |
| 384 | menuThread->Append(THREAD_STOP_THREAD, _T("S&top a running thread\tCtrl-S")); |
| 385 | menuThread->AppendSeparator(); |
| 386 | menuThread->Append(THREAD_PAUSE_THREAD, _T("&Pause a running thread\tCtrl-P")); |
| 387 | menuThread->Append(THREAD_RESUME_THREAD, _T("&Resume suspended thread\tCtrl-R")); |
| 388 | menuThread->AppendSeparator(); |
| 389 | menuThread->Append(THREAD_START_WORKER, _T("Start &worker thread\tCtrl-W")); |
| 390 | menuBar->Append(menuThread, _T("&Thread")); |
| 391 | |
| 392 | wxMenu *menuExec = new wxMenu; |
| 393 | menuExec->Append(THREAD_EXEC_MAIN, _T("&Launch a program from main thread\tF5")); |
| 394 | menuExec->Append(THREAD_EXEC_THREAD, _T("L&aunch a program from a thread\tCtrl-F5")); |
| 395 | menuBar->Append(menuExec, _T("&Execute")); |
| 396 | |
| 397 | wxMenu *menuHelp = new wxMenu; |
| 398 | menuHelp->Append(THREAD_SHOWCPUS, _T("&Show CPU count")); |
| 399 | menuHelp->AppendSeparator(); |
| 400 | menuHelp->Append(THREAD_ABOUT, _T("&About...")); |
| 401 | menuBar->Append(menuHelp, _T("&Help")); |
| 402 | |
| 403 | frame->SetMenuBar(menuBar); |
| 404 | |
| 405 | // Show the frame |
| 406 | frame->Show(true); |
| 407 | |
| 408 | SetTopWindow(frame); |
| 409 | |
| 410 | return true; |
| 411 | } |
| 412 | |
| 413 | // My frame constructor |
| 414 | MyFrame::MyFrame(wxFrame *frame, const wxString& title, |
| 415 | int x, int y, int w, int h) |
| 416 | : wxFrame(frame, wxID_ANY, title, wxPoint(x, y), wxSize(w, h)) |
| 417 | { |
| 418 | m_nRunning = m_nCount = 0; |
| 419 | |
| 420 | m_dlgProgress = (wxProgressDialog *)NULL; |
| 421 | |
| 422 | #if wxUSE_STATUSBAR |
| 423 | CreateStatusBar(2); |
| 424 | #endif // wxUSE_STATUSBAR |
| 425 | |
| 426 | m_txtctrl = new wxTextCtrl(this, wxID_ANY, _T(""), wxPoint(0, 0), wxSize(0, 0), |
| 427 | wxTE_MULTILINE | wxTE_READONLY); |
| 428 | |
| 429 | } |
| 430 | |
| 431 | MyFrame::~MyFrame() |
| 432 | { |
| 433 | // NB: although the OS will terminate all the threads anyhow when the main |
| 434 | // one exits, it's good practice to do it ourselves -- even if it's not |
| 435 | // completely trivial in this example |
| 436 | |
| 437 | // tell all the threads to terminate: note that they can't terminate while |
| 438 | // we're deleting them because they will block in their OnExit() -- this is |
| 439 | // important as otherwise we might access invalid array elements |
| 440 | wxThread *thread; |
| 441 | |
| 442 | wxGetApp().m_critsect.Enter(); |
| 443 | |
| 444 | // check if we have any threads running first |
| 445 | const wxArrayThread& threads = wxGetApp().m_threads; |
| 446 | size_t count = threads.GetCount(); |
| 447 | |
| 448 | if ( count ) |
| 449 | { |
| 450 | // set the flag for MyThread::OnExit() |
| 451 | wxGetApp().m_waitingUntilAllDone = true; |
| 452 | |
| 453 | // stop all threads |
| 454 | while ( ! threads.IsEmpty() ) |
| 455 | { |
| 456 | thread = threads.Last(); |
| 457 | |
| 458 | wxGetApp().m_critsect.Leave(); |
| 459 | |
| 460 | thread->Delete(); |
| 461 | |
| 462 | wxGetApp().m_critsect.Enter(); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | wxGetApp().m_critsect.Leave(); |
| 467 | |
| 468 | if ( count ) |
| 469 | { |
| 470 | // now wait for them to really terminate |
| 471 | wxGetApp().m_semAllDone.Wait(); |
| 472 | } |
| 473 | //else: no threads to terminate, no condition to wait for |
| 474 | } |
| 475 | |
| 476 | MyThread *MyFrame::CreateThread() |
| 477 | { |
| 478 | MyThread *thread = new MyThread(this); |
| 479 | |
| 480 | if ( thread->Create() != wxTHREAD_NO_ERROR ) |
| 481 | { |
| 482 | wxLogError(wxT("Can't create thread!")); |
| 483 | } |
| 484 | |
| 485 | wxCriticalSectionLocker enter(wxGetApp().m_critsect); |
| 486 | wxGetApp().m_threads.Add(thread); |
| 487 | |
| 488 | return thread; |
| 489 | } |
| 490 | |
| 491 | void MyFrame::OnStartThreads(wxCommandEvent& WXUNUSED(event) ) |
| 492 | { |
| 493 | static long s_num = 10; |
| 494 | |
| 495 | s_num = wxGetNumberFromUser(_T("How many threads to start: "), _T(""), |
| 496 | _T("wxThread sample"), s_num, 1, 10000, this); |
| 497 | if ( s_num == -1 ) |
| 498 | { |
| 499 | s_num = 10; |
| 500 | |
| 501 | return; |
| 502 | } |
| 503 | |
| 504 | size_t count = (size_t)s_num, n; |
| 505 | |
| 506 | wxArrayThread threads; |
| 507 | |
| 508 | // first create them all... |
| 509 | for ( n = 0; n < count; n++ ) |
| 510 | { |
| 511 | wxThread *thr = CreateThread(); |
| 512 | |
| 513 | // we want to show the effect of SetPriority(): the first thread will |
| 514 | // have the lowest priority, the second - the highest, all the rest |
| 515 | // the normal one |
| 516 | if ( n == 0 ) |
| 517 | thr->SetPriority(WXTHREAD_MIN_PRIORITY); |
| 518 | else if ( n == 1 ) |
| 519 | thr->SetPriority(WXTHREAD_MAX_PRIORITY); |
| 520 | else |
| 521 | thr->SetPriority(WXTHREAD_DEFAULT_PRIORITY); |
| 522 | |
| 523 | threads.Add(thr); |
| 524 | } |
| 525 | |
| 526 | #if wxUSE_STATUSBAR |
| 527 | wxString msg; |
| 528 | msg.Printf(wxT("%d new threads created."), count); |
| 529 | SetStatusText(msg, 1); |
| 530 | #endif // wxUSE_STATUSBAR |
| 531 | |
| 532 | // ...and then start them |
| 533 | for ( n = 0; n < count; n++ ) |
| 534 | { |
| 535 | threads[n]->Run(); |
| 536 | } |
| 537 | } |
| 538 | |
| 539 | void MyFrame::OnStartThread(wxCommandEvent& WXUNUSED(event) ) |
| 540 | { |
| 541 | MyThread *thread = CreateThread(); |
| 542 | |
| 543 | if ( thread->Run() != wxTHREAD_NO_ERROR ) |
| 544 | { |
| 545 | wxLogError(wxT("Can't start thread!")); |
| 546 | } |
| 547 | |
| 548 | #if wxUSE_STATUSBAR |
| 549 | SetStatusText(_T("New thread started."), 1); |
| 550 | #endif // wxUSE_STATUSBAR |
| 551 | } |
| 552 | |
| 553 | void MyFrame::OnStopThread(wxCommandEvent& WXUNUSED(event) ) |
| 554 | { |
| 555 | wxGetApp().m_critsect.Enter(); |
| 556 | |
| 557 | // stop the last thread |
| 558 | if ( wxGetApp().m_threads.IsEmpty() ) |
| 559 | { |
| 560 | wxLogError(wxT("No thread to stop!")); |
| 561 | |
| 562 | wxGetApp().m_critsect.Leave(); |
| 563 | } |
| 564 | else |
| 565 | { |
| 566 | wxThread *thread = wxGetApp().m_threads.Last(); |
| 567 | |
| 568 | // it's important to leave critical section before calling Delete() |
| 569 | // because delete will (implicitly) call OnExit() which also tries |
| 570 | // to enter the same crit section - would dead lock. |
| 571 | wxGetApp().m_critsect.Leave(); |
| 572 | |
| 573 | thread->Delete(); |
| 574 | |
| 575 | #if wxUSE_STATUSBAR |
| 576 | SetStatusText(_T("Thread stopped."), 1); |
| 577 | #endif // wxUSE_STATUSBAR |
| 578 | } |
| 579 | } |
| 580 | |
| 581 | void MyFrame::OnResumeThread(wxCommandEvent& WXUNUSED(event) ) |
| 582 | { |
| 583 | wxCriticalSectionLocker enter(wxGetApp().m_critsect); |
| 584 | |
| 585 | // resume first suspended thread |
| 586 | size_t n = 0, count = wxGetApp().m_threads.Count(); |
| 587 | while ( n < count && !wxGetApp().m_threads[n]->IsPaused() ) |
| 588 | n++; |
| 589 | |
| 590 | if ( n == count ) |
| 591 | { |
| 592 | wxLogError(wxT("No thread to resume!")); |
| 593 | } |
| 594 | else |
| 595 | { |
| 596 | wxGetApp().m_threads[n]->Resume(); |
| 597 | |
| 598 | #if wxUSE_STATUSBAR |
| 599 | SetStatusText(_T("Thread resumed."), 1); |
| 600 | #endif // wxUSE_STATUSBAR |
| 601 | } |
| 602 | } |
| 603 | |
| 604 | void MyFrame::OnPauseThread(wxCommandEvent& WXUNUSED(event) ) |
| 605 | { |
| 606 | wxCriticalSectionLocker enter(wxGetApp().m_critsect); |
| 607 | |
| 608 | // pause last running thread |
| 609 | int n = wxGetApp().m_threads.Count() - 1; |
| 610 | while ( n >= 0 && !wxGetApp().m_threads[n]->IsRunning() ) |
| 611 | n--; |
| 612 | |
| 613 | if ( n < 0 ) |
| 614 | { |
| 615 | wxLogError(wxT("No thread to pause!")); |
| 616 | } |
| 617 | else |
| 618 | { |
| 619 | wxGetApp().m_threads[n]->Pause(); |
| 620 | |
| 621 | #if wxUSE_STATUSBAR |
| 622 | SetStatusText(_T("Thread paused."), 1); |
| 623 | #endif // wxUSE_STATUSBAR |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | // set the frame title indicating the current number of threads |
| 628 | void MyFrame::OnIdle(wxIdleEvent& event) |
| 629 | { |
| 630 | wxCriticalSectionLocker enter(wxGetApp().m_critsect); |
| 631 | |
| 632 | // update the counts of running/total threads |
| 633 | size_t nRunning = 0, |
| 634 | nCount = wxGetApp().m_threads.Count(); |
| 635 | for ( size_t n = 0; n < nCount; n++ ) |
| 636 | { |
| 637 | if ( wxGetApp().m_threads[n]->IsRunning() ) |
| 638 | nRunning++; |
| 639 | } |
| 640 | |
| 641 | if ( nCount != m_nCount || nRunning != m_nRunning ) |
| 642 | { |
| 643 | m_nRunning = nRunning; |
| 644 | m_nCount = nCount; |
| 645 | |
| 646 | wxLogStatus(this, wxT("%u threads total, %u running."), nCount, nRunning); |
| 647 | } |
| 648 | //else: avoid flicker - don't print anything |
| 649 | |
| 650 | event.Skip(); |
| 651 | } |
| 652 | |
| 653 | void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event) ) |
| 654 | { |
| 655 | Close(true); |
| 656 | } |
| 657 | |
| 658 | void MyFrame::OnExecMain(wxCommandEvent& WXUNUSED(event)) |
| 659 | { |
| 660 | wxLogMessage(wxT("The exit code from the main program is %ld"), |
| 661 | EXEC(_T("/bin/echo \"main program\""))); |
| 662 | } |
| 663 | |
| 664 | void MyFrame::OnExecThread(wxCommandEvent& WXUNUSED(event)) |
| 665 | { |
| 666 | MyExecThread thread(wxT("/bin/echo \"child thread\"")); |
| 667 | thread.Run(); |
| 668 | |
| 669 | wxLogMessage(wxT("The exit code from a child thread is %ld"), |
| 670 | (long)thread.Wait()); |
| 671 | } |
| 672 | |
| 673 | void MyFrame::OnShowCPUs(wxCommandEvent& WXUNUSED(event)) |
| 674 | { |
| 675 | wxString msg; |
| 676 | |
| 677 | int nCPUs = wxThread::GetCPUCount(); |
| 678 | switch ( nCPUs ) |
| 679 | { |
| 680 | case -1: |
| 681 | msg = _T("Unknown number of CPUs"); |
| 682 | break; |
| 683 | |
| 684 | case 0: |
| 685 | msg = _T("WARNING: you're running without any CPUs!"); |
| 686 | break; |
| 687 | |
| 688 | case 1: |
| 689 | msg = _T("This system only has one CPU."); |
| 690 | break; |
| 691 | |
| 692 | default: |
| 693 | msg.Printf(wxT("This system has %d CPUs"), nCPUs); |
| 694 | } |
| 695 | |
| 696 | wxLogMessage(msg); |
| 697 | } |
| 698 | |
| 699 | void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event) ) |
| 700 | { |
| 701 | wxMessageDialog dialog(this, |
| 702 | _T("wxWidgets multithreaded application sample\n") |
| 703 | _T("(c) 1998 Julian Smart, Guilhem Lavaux\n") |
| 704 | _T("(c) 1999 Vadim Zeitlin\n") |
| 705 | _T("(c) 2000 Robert Roebling"), |
| 706 | _T("About wxThread sample"), |
| 707 | wxOK | wxICON_INFORMATION); |
| 708 | |
| 709 | dialog.ShowModal(); |
| 710 | } |
| 711 | |
| 712 | void MyFrame::OnClear(wxCommandEvent& WXUNUSED(event)) |
| 713 | { |
| 714 | m_txtctrl->Clear(); |
| 715 | } |
| 716 | |
| 717 | void MyFrame::OnUpdateWorker(wxUpdateUIEvent& event) |
| 718 | { |
| 719 | event.Enable( m_dlgProgress == NULL ); |
| 720 | } |
| 721 | |
| 722 | void MyFrame::OnStartWorker(wxCommandEvent& WXUNUSED(event)) |
| 723 | { |
| 724 | MyWorkerThread *thread = new MyWorkerThread(this); |
| 725 | |
| 726 | if ( thread->Create() != wxTHREAD_NO_ERROR ) |
| 727 | { |
| 728 | wxLogError(wxT("Can't create thread!")); |
| 729 | return; |
| 730 | } |
| 731 | |
| 732 | m_dlgProgress = new wxProgressDialog |
| 733 | ( |
| 734 | _T("Progress dialog"), |
| 735 | _T("Wait until the thread terminates or press [Cancel]"), |
| 736 | 100, |
| 737 | this, |
| 738 | wxPD_CAN_ABORT | |
| 739 | wxPD_APP_MODAL | |
| 740 | wxPD_ELAPSED_TIME | |
| 741 | wxPD_ESTIMATED_TIME | |
| 742 | wxPD_REMAINING_TIME |
| 743 | ); |
| 744 | |
| 745 | // thread is not running yet, no need for crit sect |
| 746 | m_cancelled = false; |
| 747 | |
| 748 | thread->Run(); |
| 749 | } |
| 750 | |
| 751 | void MyFrame::OnWorkerEvent(wxCommandEvent& event) |
| 752 | { |
| 753 | #if 0 |
| 754 | WriteText( _T("Got message from worker thread: ") ); |
| 755 | WriteText( event.GetString() ); |
| 756 | WriteText( _T("\n") ); |
| 757 | #else |
| 758 | int n = event.GetInt(); |
| 759 | if ( n == -1 ) |
| 760 | { |
| 761 | m_dlgProgress->Destroy(); |
| 762 | m_dlgProgress = (wxProgressDialog *)NULL; |
| 763 | |
| 764 | // the dialog is aborted because the event came from another thread, so |
| 765 | // we may need to wake up the main event loop for the dialog to be |
| 766 | // really closed |
| 767 | wxWakeUpIdle(); |
| 768 | } |
| 769 | else |
| 770 | { |
| 771 | if ( !m_dlgProgress->Update(n) ) |
| 772 | { |
| 773 | wxCriticalSectionLocker lock(m_critsectWork); |
| 774 | |
| 775 | m_cancelled = true; |
| 776 | } |
| 777 | } |
| 778 | #endif |
| 779 | } |
| 780 | |
| 781 | bool MyFrame::Cancelled() |
| 782 | { |
| 783 | wxCriticalSectionLocker lock(m_critsectWork); |
| 784 | |
| 785 | return m_cancelled; |
| 786 | } |