src/osx/core/evtloop_cf.cpp

   1 ///////////////////////////////////////////////////////////////////////////////
   2 // Name:        src/osx/core/evtloop_cf.cpp
   3 // Purpose:     wxEventLoop implementation common to both Carbon and Cocoa
   4 // Author:      Vadim Zeitlin
   5 // Created:     2009-10-18
   6 // RCS-ID:      $Id$
   7 // Copyright:   (c) 2009 Vadim Zeitlin <vadim@wxwidgets.org>
   8 // Licence:     wxWindows licence
   9 ///////////////////////////////////////////////////////////////////////////////
  10
  11 // ============================================================================
  12 // declarations
  13 // ============================================================================
  14
  15 // ----------------------------------------------------------------------------
  16 // headers
  17 // ----------------------------------------------------------------------------
  18
  19 // for compilers that support precompilation, includes "wx.h".
  20 #include "wx/wxprec.h"
  21
  22 #ifdef __BORLANDC__
  23     #pragma hdrstop
  24 #endif
  25
  26 #include "wx/evtloop.h"
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/log.h"
  30     #include "wx/app.h"
  31 #endif
  32
  33 #include "wx/evtloopsrc.h"
  34
  35 #include "wx/scopedptr.h"
  36
  37 #include "wx/osx/private.h"
  38 #include "wx/osx/core/cfref.h"
  39 #include "wx/thread.h"
  40
  41 #if wxUSE_GUI
  42     #include "wx/nonownedwnd.h"
  43 #endif
  44
  45 #include <CoreFoundation/CFSocket.h>
  46
  47 // ============================================================================
  48 // wxCFEventLoopSource and wxCFEventLoop implementation
  49 // ============================================================================
  50
  51 #if wxUSE_EVENTLOOP_SOURCE
  52
  53 void wxCFEventLoopSource::InitSourceSocket(CFSocketRef cfSocket)
  54 {
  55     wxASSERT_MSG( !m_cfSocket, "shouldn't be called more than once" );
  56
  57     m_cfSocket = cfSocket;
  58 }
  59
  60 wxCFEventLoopSource::~wxCFEventLoopSource()
  61 {
  62     if ( m_cfSocket )
  63     {
  64         CFSocketInvalidate(m_cfSocket);
  65         CFRelease(m_cfSocket);
  66     }
  67 }
  68
  69 #endif // wxUSE_EVENTLOOP_SOURCE
  70
  71 void wxCFEventLoop::OSXCommonModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info)
  72 {
  73     wxCFEventLoop * eventloop = static_cast<wxCFEventLoop *>(info);
  74     if ( eventloop )
  75         eventloop->CommonModeObserverCallBack(observer, activity);
  76 }
  77
  78 void wxCFEventLoop::OSXDefaultModeObserverCallBack(CFRunLoopObserverRef observer, int activity, void *info)
  79 {
  80     wxCFEventLoop * eventloop = static_cast<wxCFEventLoop *>(info);
  81     if ( eventloop )
  82         eventloop->DefaultModeObserverCallBack(observer, activity);
  83 }
  84
  85 void wxCFEventLoop::CommonModeObserverCallBack(CFRunLoopObserverRef WXUNUSED(observer), int activity)
  86 {
  87     if ( activity & kCFRunLoopBeforeTimers )
  88     {
  89         // process pending wx events first as they correspond to low-level events
  90         // which happened before, i.e. typically pending events were queued by a
  91         // previous call to Dispatch() and if we didn't process them now the next
  92         // call to it might enqueue them again (as happens with e.g. socket events
  93         // which would be generated as long as there is input available on socket
  94         // and this input is only removed from it when pending event handlers are
  95         // executed)
  96
  97         if ( wxTheApp && ShouldProcessIdleEvents() )
  98             wxTheApp->ProcessPendingEvents();
  99     }
 100
 101     if ( activity & kCFRunLoopBeforeWaiting )
 102     {
 103         if ( ShouldProcessIdleEvents() && ProcessIdle() )
 104         {
 105             WakeUp();
 106         }
 107         else
 108         {
 109 #if wxUSE_THREADS
 110             wxMutexGuiLeaveOrEnter();
 111 #endif
 112         }
 113     }
 114 }
 115
 116 void
 117 wxCFEventLoop::DefaultModeObserverCallBack(CFRunLoopObserverRef WXUNUSED(observer),
 118                                            int WXUNUSED(activity))
 119 {
 120     /*
 121     if ( activity & kCFRunLoopBeforeTimers )
 122     {
 123     }
 124
 125     if ( activity & kCFRunLoopBeforeWaiting )
 126     {
 127     }
 128     */
 129 }
 130
 131
 132 wxCFEventLoop::wxCFEventLoop()
 133 {
 134     m_shouldExit = false;
 135     m_processIdleEvents = true;
 136
 137 #if wxUSE_UIACTIONSIMULATOR
 138     m_shouldWaitForEvent = false;
 139 #endif
 140
 141     m_runLoop = CFGetCurrentRunLoop();
 142
 143     CFRunLoopObserverContext ctxt;
 144     bzero( &ctxt, sizeof(ctxt) );
 145     ctxt.info = this;
 146     m_commonModeRunLoopObserver = CFRunLoopObserverCreate( kCFAllocatorDefault, kCFRunLoopBeforeTimers | kCFRunLoopBeforeWaiting , true /* repeats */, 0,
 147                                                           (CFRunLoopObserverCallBack) wxCFEventLoop::OSXCommonModeObserverCallBack, &ctxt );
 148     CFRunLoopAddObserver(m_runLoop, m_commonModeRunLoopObserver, kCFRunLoopCommonModes);
 149
 150     m_defaultModeRunLoopObserver = CFRunLoopObserverCreate( kCFAllocatorDefault, kCFRunLoopBeforeTimers | kCFRunLoopBeforeWaiting , true /* repeats */, 0,
 151                                                            (CFRunLoopObserverCallBack) wxCFEventLoop::OSXDefaultModeObserverCallBack, &ctxt );
 152     CFRunLoopAddObserver(m_runLoop, m_defaultModeRunLoopObserver, kCFRunLoopDefaultMode);
 153 }
 154
 155 wxCFEventLoop::~wxCFEventLoop()
 156 {
 157     CFRunLoopRemoveObserver(m_runLoop, m_commonModeRunLoopObserver, kCFRunLoopCommonModes);
 158     CFRunLoopRemoveObserver(m_runLoop, m_defaultModeRunLoopObserver, kCFRunLoopDefaultMode);
 159
 160     CFRelease(m_defaultModeRunLoopObserver);
 161     CFRelease(m_commonModeRunLoopObserver);
 162 }
 163
 164
 165 CFRunLoopRef wxCFEventLoop::CFGetCurrentRunLoop() const
 166 {
 167     return CFRunLoopGetCurrent();
 168 }
 169
 170 void wxCFEventLoop::WakeUp()
 171 {
 172     CFRunLoopWakeUp(m_runLoop);
 173 }
 174
 175 #if wxUSE_BASE
 176
 177 void wxMacWakeUp()
 178 {
 179     wxEventLoopBase * const loop = wxEventLoopBase::GetActive();
 180
 181     if ( loop )
 182         loop->WakeUp();
 183 }
 184
 185 #endif
 186
 187 bool wxCFEventLoop::YieldFor(long eventsToProcess)
 188 {
 189 #if wxUSE_THREADS
 190     // Yielding from a non-gui thread needs to bail out, otherwise we end up
 191     // possibly sending events in the thread too.
 192     if ( !wxThread::IsMain() )
 193     {
 194         return true;
 195     }
 196 #endif // wxUSE_THREADS
 197
 198     m_isInsideYield = true;
 199     m_eventsToProcessInsideYield = eventsToProcess;
 200
 201 #if wxUSE_LOG
 202     // disable log flushing from here because a call to wxYield() shouldn't
 203     // normally result in message boxes popping up &c
 204     wxLog::Suspend();
 205 #endif // wxUSE_LOG
 206
 207     // process all pending events:
 208     while ( DoProcessEvents() == 1 )
 209         ;
 210
 211     // it's necessary to call ProcessIdle() to update the frames sizes which
 212     // might have been changed (it also will update other things set from
 213     // OnUpdateUI() which is a nice (and desired) side effect)
 214     while ( ProcessIdle() ) {}
 215
 216     // if there are pending events, we must process them.
 217     if (wxTheApp)
 218         wxTheApp->ProcessPendingEvents();
 219
 220 #if wxUSE_LOG
 221     wxLog::Resume();
 222 #endif // wxUSE_LOG
 223     m_isInsideYield = false;
 224
 225     return true;
 226 }
 227
 228 // implement/override base class pure virtual
 229 bool wxCFEventLoop::Pending() const
 230 {
 231     return true;
 232 }
 233
 234 int wxCFEventLoop::DoProcessEvents()
 235 {
 236 #if wxUSE_UIACTIONSIMULATOR
 237     if ( m_shouldWaitForEvent )
 238     {
 239         int  handled = DispatchTimeout( 1000 );
 240         wxASSERT_MSG( handled == 1, "No Event Available");
 241         m_shouldWaitForEvent = false;
 242         return handled;
 243     }
 244     else
 245 #endif
 246         return DispatchTimeout( 0 );
 247 }
 248
 249 bool wxCFEventLoop::Dispatch()
 250 {
 251     return DoProcessEvents() != 0;
 252 }
 253
 254 int wxCFEventLoop::DispatchTimeout(unsigned long timeout)
 255 {
 256     if ( !wxTheApp )
 257         return 0;
 258
 259     int status = DoDispatchTimeout(timeout);
 260
 261     switch( status )
 262     {
 263         case 0:
 264             break;
 265         case -1:
 266             if ( m_shouldExit )
 267                 return 0;
 268
 269             break;
 270         case 1:
 271             break;
 272     }
 273
 274     return status;
 275 }
 276
 277 int wxCFEventLoop::DoDispatchTimeout(unsigned long timeout)
 278 {
 279     SInt32 status = CFRunLoopRunInMode(kCFRunLoopDefaultMode, timeout / 1000.0 , true);
 280     switch( status )
 281     {
 282         case kCFRunLoopRunFinished:
 283             wxFAIL_MSG( "incorrect run loop state" );
 284             break;
 285         case kCFRunLoopRunStopped:
 286             return 0;
 287             break;
 288         case kCFRunLoopRunTimedOut:
 289             return -1;
 290             break;
 291         case kCFRunLoopRunHandledSource:
 292         default:
 293             break;
 294     }
 295     return 1;
 296 }
 297
 298 void wxCFEventLoop::OSXDoRun()
 299 {
 300     for ( ;; )
 301     {
 302         // generate and process idle events for as long as we don't
 303         // have anything else to do
 304         DoProcessEvents();
 305
 306         // if the "should exit" flag is set, the loop should terminate
 307         // but not before processing any remaining messages so while
 308         // Pending() returns true, do process them
 309         if ( m_shouldExit )
 310         {
 311             while ( DoProcessEvents() == 1 )
 312                 ;
 313
 314             break;
 315         }
 316     }
 317 }
 318
 319 void wxCFEventLoop::OSXDoStop()
 320 {
 321     CFRunLoopStop(CFGetCurrentRunLoop());
 322 }
 323
 324 // enters a loop calling OnNextIteration(), Pending() and Dispatch() and
 325 // terminating when Exit() is called
 326 int wxCFEventLoop::DoRun()
 327 {
 328     // we must ensure that OnExit() is called even if an exception is thrown
 329     // from inside ProcessEvents() but we must call it from Exit() in normal
 330     // situations because it is supposed to be called synchronously,
 331     // wxModalEventLoop depends on this (so we can't just use ON_BLOCK_EXIT or
 332     // something similar here)
 333 #if wxUSE_EXCEPTIONS
 334     for ( ;; )
 335     {
 336         try
 337         {
 338 #endif // wxUSE_EXCEPTIONS
 339
 340             OSXDoRun();
 341
 342 #if wxUSE_EXCEPTIONS
 343             // exit the outer loop as well
 344             break;
 345         }
 346         catch ( ... )
 347         {
 348             try
 349             {
 350                 if ( !wxTheApp || !wxTheApp->OnExceptionInMainLoop() )
 351                 {
 352                     OnExit();
 353                     break;
 354                 }
 355                 //else: continue running the event loop
 356             }
 357             catch ( ... )
 358             {
 359                 // OnException() throwed, possibly rethrowing the same
 360                 // exception again: very good, but we still need OnExit() to
 361                 // be called
 362                 OnExit();
 363                 throw;
 364             }
 365         }
 366     }
 367 #endif // wxUSE_EXCEPTIONS
 368
 369     return m_exitcode;
 370 }
 371
 372 // sets the "should exit" flag and wakes up the loop so that it terminates
 373 // soon
 374 void wxCFEventLoop::ScheduleExit(int rc)
 375 {
 376     m_exitcode = rc;
 377     m_shouldExit = true;
 378     OSXDoStop();
 379 }
 380
 381 wxCFEventLoopPauseIdleEvents::wxCFEventLoopPauseIdleEvents()
 382 {
 383     wxCFEventLoop* cfl = dynamic_cast<wxCFEventLoop*>(wxEventLoopBase::GetActive());
 384     if ( cfl )
 385     {
 386         m_formerState = cfl->ShouldProcessIdleEvents();
 387         cfl->SetProcessIdleEvents(false);
 388     }
 389     else
 390         m_formerState = true;
 391 }
 392
 393 wxCFEventLoopPauseIdleEvents::~wxCFEventLoopPauseIdleEvents()
 394 {
 395     wxCFEventLoop* cfl = dynamic_cast<wxCFEventLoop*>(wxEventLoopBase::GetActive());
 396     if ( cfl )
 397         cfl->SetProcessIdleEvents(m_formerState);
 398 }
 399
 400 // TODO Move to thread_osx.cpp
 401
 402 #if wxUSE_THREADS
 403
 404 // ----------------------------------------------------------------------------
 405 // GUI Serialization copied from MSW implementation
 406 // ----------------------------------------------------------------------------
 407
 408 // if it's false, some secondary thread is holding the GUI lock
 409 static bool gs_bGuiOwnedByMainThread = true;
 410
 411 // critical section which controls access to all GUI functions: any secondary
 412 // thread (i.e. except the main one) must enter this crit section before doing
 413 // any GUI calls
 414 static wxCriticalSection *gs_critsectGui = NULL;
 415
 416 // critical section which protects gs_nWaitingForGui variable
 417 static wxCriticalSection *gs_critsectWaitingForGui = NULL;
 418
 419 // number of threads waiting for GUI in wxMutexGuiEnter()
 420 static size_t gs_nWaitingForGui = 0;
 421
 422 void wxOSXThreadModuleOnInit()
 423 {
 424     gs_critsectWaitingForGui = new wxCriticalSection();
 425     gs_critsectGui = new wxCriticalSection();
 426     gs_critsectGui->Enter();
 427 }
 428
 429
 430 void wxOSXThreadModuleOnExit()
 431 {
 432     if ( gs_critsectGui )
 433     {
 434         if ( !wxGuiOwnedByMainThread() )
 435         {
 436             gs_critsectGui->Enter();
 437             gs_bGuiOwnedByMainThread = true;
 438         }
 439
 440         gs_critsectGui->Leave();
 441         wxDELETE(gs_critsectGui);
 442     }
 443
 444     wxDELETE(gs_critsectWaitingForGui);
 445 }
 446
 447
 448 // wake up the main thread
 449 void WXDLLIMPEXP_BASE wxWakeUpMainThread()
 450 {
 451     wxMacWakeUp();
 452 }
 453
 454 void wxMutexGuiEnterImpl()
 455 {
 456     // this would dead lock everything...
 457     wxASSERT_MSG( !wxThread::IsMain(),
 458                  wxT("main thread doesn't want to block in wxMutexGuiEnter()!") );
 459
 460     // the order in which we enter the critical sections here is crucial!!
 461
 462     // set the flag telling to the main thread that we want to do some GUI
 463     {
 464         wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
 465
 466         gs_nWaitingForGui++;
 467     }
 468
 469     wxWakeUpMainThread();
 470
 471     // now we may block here because the main thread will soon let us in
 472     // (during the next iteration of OnIdle())
 473     gs_critsectGui->Enter();
 474 }
 475
 476 void wxMutexGuiLeaveImpl()
 477 {
 478     wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
 479
 480     if ( wxThread::IsMain() )
 481     {
 482         gs_bGuiOwnedByMainThread = false;
 483     }
 484     else
 485     {
 486         // decrement the number of threads waiting for GUI access now
 487         wxASSERT_MSG( gs_nWaitingForGui > 0,
 488                      wxT("calling wxMutexGuiLeave() without entering it first?") );
 489
 490         gs_nWaitingForGui--;
 491
 492         wxWakeUpMainThread();
 493     }
 494
 495     gs_critsectGui->Leave();
 496 }
 497
 498 void WXDLLIMPEXP_BASE wxMutexGuiLeaveOrEnter()
 499 {
 500     wxASSERT_MSG( wxThread::IsMain(),
 501                  wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
 502
 503     if ( !gs_critsectWaitingForGui )
 504         return;
 505
 506     wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
 507
 508     if ( gs_nWaitingForGui == 0 )
 509     {
 510         // no threads are waiting for GUI - so we may acquire the lock without
 511         // any danger (but only if we don't already have it)
 512         if ( !wxGuiOwnedByMainThread() )
 513         {
 514             gs_critsectGui->Enter();
 515
 516             gs_bGuiOwnedByMainThread = true;
 517         }
 518         //else: already have it, nothing to do
 519     }
 520     else
 521     {
 522         // some threads are waiting, release the GUI lock if we have it
 523         if ( wxGuiOwnedByMainThread() )
 524             wxMutexGuiLeave();
 525         //else: some other worker thread is doing GUI
 526     }
 527 }
 528
 529 bool WXDLLIMPEXP_BASE wxGuiOwnedByMainThread()
 530 {
 531     return gs_bGuiOwnedByMainThread;
 532 }
 533
 534 #endif