src/mac/thread.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        thread.cpp
   3 // Purpose:     wxThread Implementation
   4 // Author:      Original from Wolfram Gloger/Guilhem Lavaux/Vadim Zeitlin
   5 // Modified by: Stefan Csomor
   6 // Created:     04/22/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998),
   9 //                  Vadim Zeitlin (1999) , Stefan Csomor (2000)
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifdef __GNUG__
  14     #pragma implementation "thread.h"
  15 #endif
  16
  17 // ----------------------------------------------------------------------------
  18 // headers
  19 // ----------------------------------------------------------------------------
  20
  21 // For compilers that support precompilation, includes "wx.h".
  22 #include "wx/wxprec.h"
  23
  24 #if defined(__BORLANDC__)
  25     #pragma hdrstop
  26 #endif
  27
  28 #ifndef WX_PRECOMP
  29     #include "wx/wx.h"
  30 #endif
  31
  32 #if wxUSE_THREADS
  33
  34 #include "wx/module.h"
  35 #include "wx/thread.h"
  36
  37 #ifdef __WXMAC__
  38 #include <Threads.h>
  39 #include "wx/mac/uma.h"
  40 #endif
  41
  42 #define INFINITE 0xFFFFFFFF
  43
  44 // ----------------------------------------------------------------------------
  45 // constants
  46 // ----------------------------------------------------------------------------
  47
  48 // the possible states of the thread ("=>" shows all possible transitions from
  49 // this state)
  50 enum wxThreadState
  51 {
  52     STATE_NEW,          // didn't start execution yet (=> RUNNING)
  53     STATE_RUNNING,      // thread is running (=> PAUSED, CANCELED)
  54     STATE_PAUSED,       // thread is temporarily suspended (=> RUNNING)
  55     STATE_CANCELED,     // thread should terminate a.s.a.p. (=> EXITED)
  56     STATE_EXITED        // thread is terminating
  57 };
  58
  59 // ----------------------------------------------------------------------------
  60 // this module globals
  61 // ----------------------------------------------------------------------------
  62
  63 static ThreadID gs_idMainThread = kNoThreadID ;
  64 static bool gs_waitingForThread = FALSE ;
  65
  66 // ============================================================================
  67 // MacOS implementation of thread classes
  68 // ============================================================================
  69
  70 class wxMacStCritical
  71 {
  72 public :
  73     wxMacStCritical()
  74     {
  75         if ( UMASystemIsInitialized() )
  76             ThreadBeginCritical() ;
  77     }
  78     ~wxMacStCritical()
  79     {
  80         if ( UMASystemIsInitialized() )
  81             ThreadEndCritical() ;
  82     }
  83 };
  84
  85 // ----------------------------------------------------------------------------
  86 // wxMutex implementation
  87 // ----------------------------------------------------------------------------
  88
  89 class wxMutexInternal
  90 {
  91 public:
  92     wxMutexInternal(wxMutexType WXUNUSED(mutexType))
  93     {
  94         m_owner = kNoThreadID ;
  95         m_locked = 0;
  96     }
  97
  98     ~wxMutexInternal()
  99     {
 100         if ( m_locked > 0 )
 101         {
 102             wxLogDebug(_T("Warning: freeing a locked mutex (%ld locks)."), m_locked);
 103         }
 104     }
 105
 106     bool IsOk() const { return true; }
 107
 108     wxMutexError Lock() ;
 109     wxMutexError TryLock() ;
 110     wxMutexError Unlock();
 111 public:
 112     ThreadID m_owner ;
 113     wxArrayLong m_waiters ;
 114     long m_locked ;
 115 };
 116
 117 wxMutexError wxMutexInternal::Lock()
 118 {
 119     wxMacStCritical critical ;
 120     if ( UMASystemIsInitialized() )
 121     {
 122         OSErr err ;
 123         ThreadID current = kNoThreadID;
 124         err = ::MacGetCurrentThread(&current);
 125         // if we are not the owner, add this thread to the list of waiting threads, stop this thread
 126         // and invoke the scheduler to continue executing the owner's thread
 127         while ( m_owner != kNoThreadID && m_owner != current)
 128         {
 129             m_waiters.Add(current);
 130             err = ::SetThreadStateEndCritical(kCurrentThreadID, kStoppedThreadState, m_owner);
 131             err = ::ThreadBeginCritical();
 132         }
 133         m_owner = current;
 134     }
 135     m_locked++;
 136
 137     return wxMUTEX_NO_ERROR;
 138 }
 139
 140 wxMutexError wxMutexInternal::TryLock()
 141 {
 142     wxMacStCritical critical ;
 143     if ( UMASystemIsInitialized() )
 144     {
 145         ThreadID current = kNoThreadID;
 146         ::MacGetCurrentThread(&current);
 147         // if we are not the owner, give an error back
 148         if ( m_owner != kNoThreadID && m_owner != current )
 149             return wxMUTEX_BUSY;
 150
 151         m_owner = current;
 152     }
 153     m_locked++;
 154
 155    return wxMUTEX_NO_ERROR;
 156 }
 157
 158 wxMutexError wxMutexInternal::Unlock()
 159 {
 160     if ( UMASystemIsInitialized() )
 161     {
 162         OSErr err;
 163         err = ::ThreadBeginCritical();
 164
 165         if (m_locked > 0)
 166             m_locked--;
 167
 168         // this mutex is not owned by anybody anmore
 169         m_owner = kNoThreadID;
 170
 171         // now pass on to the first waiting thread
 172         ThreadID firstWaiting = kNoThreadID;
 173         bool found = false;
 174         while (!m_waiters.IsEmpty() && !found)
 175         {
 176             firstWaiting = m_waiters[0];
 177             err = ::SetThreadState(firstWaiting, kReadyThreadState, kNoThreadID);
 178             // in case this was not successful (dead thread), we just loop on and reset the id
 179             found = (err != threadNotFoundErr);
 180             if ( !found )
 181                 firstWaiting = kNoThreadID ;
 182             m_waiters.RemoveAt(0) ;
 183         }
 184         // now we have a valid firstWaiting thread, which has been scheduled to run next, just end the
 185         // critical section and invoke the scheduler
 186         err = ::SetThreadStateEndCritical(kCurrentThreadID, kReadyThreadState, firstWaiting);
 187     }
 188     else
 189     {
 190         if (m_locked > 0)
 191             m_locked--;
 192     }
 193     return wxMUTEX_NO_ERROR;
 194 }
 195
 196 // --------------------------------------------------------------------------
 197 // wxSemaphore
 198 // --------------------------------------------------------------------------
 199
 200 // TODO not yet implemented
 201
 202 class wxSemaphoreInternal
 203 {
 204 public:
 205     wxSemaphoreInternal(int initialcount, int maxcount);
 206     ~wxSemaphoreInternal();
 207
 208     bool IsOk() const { return true ; }
 209
 210     wxSemaError Wait() { return WaitTimeout(INFINITE); }
 211     wxSemaError TryWait() { return WaitTimeout(0); }
 212     wxSemaError WaitTimeout(unsigned long milliseconds);
 213
 214     wxSemaError Post();
 215
 216 private:
 217 };
 218
 219 wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
 220 {
 221     if ( maxcount == 0 )
 222     {
 223         // make it practically infinite
 224         maxcount = INT_MAX;
 225     }
 226 }
 227
 228 wxSemaphoreInternal::~wxSemaphoreInternal()
 229 {
 230 }
 231
 232 wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds)
 233 {
 234     return wxSEMA_MISC_ERROR;
 235 }
 236
 237 wxSemaError wxSemaphoreInternal::Post()
 238 {
 239     return wxSEMA_MISC_ERROR;
 240 }
 241
 242 // ----------------------------------------------------------------------------
 243 // wxCondition implementation
 244 // ----------------------------------------------------------------------------
 245
 246 // TODO this is not yet completed
 247
 248 class wxConditionInternal
 249 {
 250 public:
 251     wxConditionInternal(wxMutex& mutex) : m_mutex(mutex)
 252     {
 253         m_excessSignals = 0 ;
 254     }
 255     ~wxConditionInternal()
 256     {
 257     }
 258
 259     bool IsOk() const { return m_mutex.IsOk() ; }
 260
 261     wxCondError Wait()
 262     {
 263         return WaitTimeout(0xFFFFFFFF );
 264     }
 265
 266     wxCondError WaitTimeout(unsigned long msectimeout)
 267     {
 268         wxMacStCritical critical ;
 269         if ( m_excessSignals > 0 )
 270         {
 271             --m_excessSignals ;
 272             return wxCOND_NO_ERROR ;
 273         }
 274         else if ( msectimeout == 0 )
 275         {
 276             return wxCOND_MISC_ERROR ;
 277         }
 278         else
 279         {
 280         }
 281         /*
 282         waiters++;
 283
 284         // FIXME this should be MsgWaitForMultipleObjects() as well probably
 285         DWORD rc = ::WaitForSingleObject(event, timeout);
 286
 287         waiters--;
 288
 289         return rc != WAIT_TIMEOUT;
 290         */
 291         return wxCOND_NO_ERROR ;
 292     }
 293     wxCondError Signal()
 294     {
 295         wxMacStCritical critical ;
 296         return wxCOND_NO_ERROR;
 297     }
 298
 299     wxCondError Broadcast()
 300     {
 301         wxMacStCritical critical ;
 302         return wxCOND_NO_ERROR;
 303     }
 304
 305     wxArrayLong m_waiters ;
 306     wxInt32     m_excessSignals ;
 307     wxMutex&    m_mutex;
 308 };
 309
 310 // ----------------------------------------------------------------------------
 311 // wxCriticalSection implementation
 312 // ----------------------------------------------------------------------------
 313
 314 // it's implemented as a mutex on mac os, so it is defined in the headers
 315
 316 // ----------------------------------------------------------------------------
 317 // wxThread implementation
 318 // ----------------------------------------------------------------------------
 319
 320 // wxThreadInternal class
 321 // ----------------------
 322
 323 class wxThreadInternal
 324 {
 325 public:
 326     wxThreadInternal()
 327     {
 328         m_tid = kNoThreadID ;
 329         m_state = STATE_NEW;
 330         m_priority = WXTHREAD_DEFAULT_PRIORITY;
 331     }
 332
 333     ~wxThreadInternal()
 334     {
 335     }
 336
 337     void Free()
 338     {
 339     }
 340
 341     // create a new (suspended) thread (for the given thread object)
 342     bool Create(wxThread *thread, unsigned int stackSize);
 343
 344     // suspend/resume/terminate
 345     bool Suspend();
 346     bool Resume();
 347     void Cancel() { m_state = STATE_CANCELED; }
 348
 349     // thread state
 350     void SetState(wxThreadState state) { m_state = state; }
 351     wxThreadState GetState() const { return m_state; }
 352
 353     // thread priority
 354     void SetPriority(unsigned int priority);
 355     unsigned int GetPriority() const { return m_priority; }
 356
 357     void SetResult( void *res ) { m_result = res ; }
 358     void *GetResult() { return m_result ; }
 359
 360     // thread handle and id
 361     ThreadID  GetId() const { return m_tid; }
 362
 363     // thread function
 364     static pascal void*    MacThreadStart(wxThread* arg);
 365
 366 private:
 367     wxThreadState           m_state;      // state, see wxThreadState enum
 368     unsigned int            m_priority;   // thread priority in "wx" units
 369     ThreadID                m_tid;        // thread id
 370     void*                   m_result;
 371     static ThreadEntryUPP   s_threadEntry ;
 372 };
 373
 374 static wxArrayPtrVoid s_threads ;
 375
 376 ThreadEntryUPP wxThreadInternal::s_threadEntry = NULL ;
 377 pascal void* wxThreadInternal::MacThreadStart(wxThread *thread)
 378 {
 379     // first of all, check whether we hadn't been cancelled already
 380     if ( thread->m_internal->GetState() == STATE_EXITED )
 381     {
 382         return (void*)-1;
 383     }
 384
 385     void* rc = thread->Entry();
 386
 387     // enter m_critsect before changing the thread state
 388     thread->m_critsect.Enter();
 389     bool wasCancelled = thread->m_internal->GetState() == STATE_CANCELED;
 390     thread->m_internal->SetState(STATE_EXITED);
 391     thread->m_critsect.Leave();
 392
 393     thread->OnExit();
 394
 395     // if the thread was cancelled (from Delete()), then it the handle is still
 396     // needed there
 397     if ( thread->IsDetached() && !wasCancelled )
 398     {
 399         // auto delete
 400         delete thread;
 401     }
 402     //else: the joinable threads handle will be closed when Wait() is done
 403
 404     return rc;
 405 }
 406 void wxThreadInternal::SetPriority(unsigned int priority)
 407 {
 408     // Priorities don't exist on Mac
 409 }
 410
 411 bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize)
 412 {
 413     if ( s_threadEntry == NULL )
 414     {
 415         s_threadEntry = NewThreadEntryUPP( (ThreadEntryProcPtr) MacThreadStart ) ;
 416     }
 417     OSErr err = NewThread( kCooperativeThread,
 418                            s_threadEntry,
 419                            (void*) thread,
 420                            stackSize,
 421                            kNewSuspend,
 422                            &m_result,
 423                            &m_tid );
 424
 425     if ( err != noErr )
 426     {
 427         wxLogSysError(_("Can't create thread"));
 428         return FALSE;
 429     }
 430
 431     if ( m_priority != WXTHREAD_DEFAULT_PRIORITY )
 432     {
 433         SetPriority(m_priority);
 434     }
 435
 436     return TRUE;
 437 }
 438
 439 bool wxThreadInternal::Suspend()
 440 {
 441     OSErr err ;
 442
 443     ::ThreadBeginCritical();
 444
 445     if ( m_state != STATE_RUNNING )
 446     {
 447         ::ThreadEndCritical() ;
 448         wxLogSysError(_("Can not suspend thread %x"), m_tid);
 449         return FALSE;
 450     }
 451
 452     m_state = STATE_PAUSED;
 453
 454     err = ::SetThreadStateEndCritical(m_tid, kStoppedThreadState, kNoThreadID);
 455
 456     return TRUE;
 457 }
 458
 459 bool wxThreadInternal::Resume()
 460 {
 461     ThreadID current ;
 462     OSErr err ;
 463     err = MacGetCurrentThread( &current ) ;
 464
 465     wxASSERT( err == noErr ) ;
 466     wxASSERT( current != m_tid ) ;
 467
 468     ::ThreadBeginCritical();
 469     if ( m_state != STATE_PAUSED && m_state != STATE_NEW )
 470     {
 471         ::ThreadEndCritical() ;
 472         wxLogSysError(_("Can not resume thread %x"), m_tid);
 473         return FALSE;
 474
 475     }
 476     err = ::SetThreadStateEndCritical(m_tid, kReadyThreadState, kNoThreadID);
 477     wxASSERT( err == noErr ) ;
 478
 479     m_state = STATE_RUNNING;
 480     ::ThreadEndCritical() ;
 481     ::YieldToAnyThread() ;
 482     return TRUE;
 483 }
 484
 485 // static functions
 486 // ----------------
 487 wxThread *wxThread::This()
 488 {
 489     wxMacStCritical critical ;
 490
 491     ThreadID current ;
 492     OSErr err ;
 493
 494     err = MacGetCurrentThread( &current ) ;
 495
 496     for ( size_t i = 0 ; i < s_threads.Count() ; ++i )
 497     {
 498         if ( ( (wxThread*) s_threads[i] )->GetId() == current )
 499             return (wxThread*) s_threads[i] ;
 500     }
 501
 502     wxLogSysError(_("Couldn't get the current thread pointer"));
 503     return NULL;
 504 }
 505
 506 bool wxThread::IsMain()
 507 {
 508     ThreadID current ;
 509     OSErr err ;
 510
 511     err = MacGetCurrentThread( &current ) ;
 512     return current == gs_idMainThread;
 513 }
 514
 515 #ifdef Yield
 516 #undef Yield
 517 #endif
 518
 519 void wxThread::Yield()
 520 {
 521     ::YieldToAnyThread() ;
 522 }
 523
 524 void wxThread::Sleep(unsigned long milliseconds)
 525 {
 526     clock_t start = clock();
 527     do
 528     {
 529         YieldToAnyThread();
 530     } while( clock() - start < milliseconds /  1000.0 * CLOCKS_PER_SEC ) ;
 531 }
 532
 533 int wxThread::GetCPUCount()
 534 {
 535     // we will use whatever MP API will be used for the new MP Macs
 536     return 1;
 537 }
 538
 539 unsigned long wxThread::GetCurrentId()
 540 {
 541     ThreadID current ;
 542     MacGetCurrentThread( &current ) ;
 543     return (unsigned long)current;
 544 }
 545
 546 bool wxThread::SetConcurrency(size_t level)
 547 {
 548     wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
 549
 550     // ok only for the default one
 551     if ( level == 0 )
 552         return 0;
 553
 554     // how many CPUs have we got?
 555     if ( GetCPUCount() == 1 )
 556     {
 557         // don't bother with all this complicated stuff - on a single
 558         // processor system it doesn't make much sense anyhow
 559         return level == 1;
 560     }
 561
 562     return TRUE ;
 563 }
 564
 565 // ctor and dtor
 566 // -------------
 567
 568 wxThread::wxThread(wxThreadKind kind)
 569 {
 570     m_internal = new wxThreadInternal();
 571
 572     m_isDetached = kind == wxTHREAD_DETACHED;
 573     s_threads.Add( (void*) this ) ;
 574 }
 575
 576 wxThread::~wxThread()
 577 {
 578     s_threads.Remove( (void*) this ) ;
 579     if (m_internal != NULL) {
 580         delete m_internal;
 581         m_internal = NULL;
 582     }
 583 }
 584
 585 // create/start thread
 586 // -------------------
 587
 588 wxThreadError wxThread::Create(unsigned int stackSize)
 589 {
 590     wxCriticalSectionLocker lock(m_critsect);
 591
 592     if ( !m_internal->Create(this, stackSize) )
 593         return wxTHREAD_NO_RESOURCE;
 594
 595     return wxTHREAD_NO_ERROR;
 596 }
 597
 598 wxThreadError wxThread::Run()
 599 {
 600     wxCriticalSectionLocker lock(m_critsect);
 601
 602     if ( m_internal->GetState() != STATE_NEW )
 603     {
 604         // actually, it may be almost any state at all, not only STATE_RUNNING
 605         return wxTHREAD_RUNNING;
 606     }
 607
 608     // the thread has just been created and is still suspended - let it run
 609     return Resume();
 610 }
 611
 612 // suspend/resume thread
 613 // ---------------------
 614
 615 wxThreadError wxThread::Pause()
 616 {
 617     wxCriticalSectionLocker lock(m_critsect);
 618
 619     return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 620 }
 621
 622 wxThreadError wxThread::Resume()
 623 {
 624     wxCriticalSectionLocker lock(m_critsect);
 625
 626     return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 627 }
 628
 629 // stopping thread
 630 // ---------------
 631
 632 wxThread::ExitCode wxThread::Wait()
 633 {
 634     // although under MacOS we can wait for any thread, it's an error to
 635     // wait for a detached one in wxWin API
 636     wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
 637                  _T("can't wait for detached thread") );
 638
 639     ExitCode rc = (ExitCode)-1;
 640
 641     (void)Delete(&rc);
 642
 643     m_internal->Free();
 644
 645     return rc;
 646 }
 647
 648 wxThreadError wxThread::Delete(ExitCode *pRc)
 649 {
 650     ExitCode rc = 0;
 651
 652     // Delete() is always safe to call, so consider all possible states
 653
 654     // has the thread started to run?
 655     bool shouldResume = FALSE;
 656
 657     {
 658         wxCriticalSectionLocker lock(m_critsect);
 659
 660         if ( m_internal->GetState() == STATE_NEW )
 661         {
 662             // WinThreadStart() will see it and terminate immediately
 663             m_internal->SetState(STATE_EXITED);
 664
 665             shouldResume = TRUE;
 666         }
 667     }
 668
 669     // is the thread paused?
 670     if ( shouldResume || IsPaused() )
 671         Resume();
 672
 673     // does is still run?
 674     if ( IsRunning() )
 675     {
 676         if ( IsMain() )
 677         {
 678             // set flag for wxIsWaitingForThread()
 679             gs_waitingForThread = TRUE;
 680
 681 #if wxUSE_GUI
 682             wxBeginBusyCursor();
 683 #endif // wxUSE_GUI
 684         }
 685
 686         // ask the thread to terminate
 687         {
 688             wxCriticalSectionLocker lock(m_critsect);
 689
 690             m_internal->Cancel();
 691         }
 692
 693 #if wxUSE_GUI
 694         // simply wait for the thread to terminate
 695         while( TestDestroy() )
 696         {
 697             ::YieldToAnyThread() ;
 698         }
 699 #else // !wxUSE_GUI
 700         // simply wait for the thread to terminate
 701         while( TestDestroy() )
 702         {
 703             ::YieldToAnyThread() ;
 704         }
 705 #endif // wxUSE_GUI/!wxUSE_GUI
 706
 707         if ( IsMain() )
 708         {
 709             gs_waitingForThread = FALSE;
 710
 711 #if wxUSE_GUI
 712             wxEndBusyCursor();
 713 #endif // wxUSE_GUI
 714         }
 715     }
 716
 717  //   if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
 718     {
 719         wxLogLastError("GetExitCodeThread");
 720
 721         rc = (ExitCode)-1;
 722     }
 723
 724     if ( IsDetached() )
 725     {
 726         // if the thread exits normally, this is done in WinThreadStart, but in
 727         // this case it would have been too early because
 728         // MsgWaitForMultipleObject() would fail if the therad handle was
 729         // closed while we were waiting on it, so we must do it here
 730         delete this;
 731     }
 732
 733  //   wxASSERT_MSG( (DWORD)rc != STILL_ACTIVE,
 734  //                 wxT("thread must be already terminated.") );
 735
 736     if ( pRc )
 737         *pRc = rc;
 738
 739     return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
 740 }
 741
 742 wxThreadError wxThread::Kill()
 743 {
 744     if ( !IsRunning() )
 745         return wxTHREAD_NOT_RUNNING;
 746
 747 //    if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
 748     {
 749         wxLogSysError(_("Couldn't terminate thread"));
 750
 751         return wxTHREAD_MISC_ERROR;
 752     }
 753
 754     m_internal->Free();
 755
 756     if ( IsDetached() )
 757     {
 758         delete this;
 759     }
 760
 761     return wxTHREAD_NO_ERROR;
 762 }
 763
 764 void wxThread::Exit(ExitCode status)
 765 {
 766     m_internal->Free();
 767
 768     if ( IsDetached() )
 769     {
 770         delete this;
 771     }
 772
 773     m_internal->SetResult( status ) ;
 774
 775 /*
 776 #if defined(__VISUALC__) || (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500))
 777     _endthreadex((unsigned)status);
 778 #else // !VC++
 779     ::ExitThread((DWORD)status);
 780 #endif // VC++/!VC++
 781 */
 782     wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
 783 }
 784
 785 // priority setting
 786 // ----------------
 787
 788 // since all these calls are execute cooperatively we don't have to use the critical section
 789
 790 void wxThread::SetPriority(unsigned int prio)
 791 {
 792     m_internal->SetPriority(prio);
 793 }
 794
 795 unsigned int wxThread::GetPriority() const
 796 {
 797     return m_internal->GetPriority();
 798 }
 799
 800 unsigned long wxThread::GetId() const
 801 {
 802     return (unsigned long)m_internal->GetId();
 803 }
 804
 805 bool wxThread::IsRunning() const
 806 {
 807     return m_internal->GetState() == STATE_RUNNING;
 808 }
 809
 810 bool wxThread::IsAlive() const
 811 {
 812     return (m_internal->GetState() == STATE_RUNNING) ||
 813            (m_internal->GetState() == STATE_PAUSED);
 814 }
 815
 816 bool wxThread::IsPaused() const
 817 {
 818     return m_internal->GetState() == STATE_PAUSED;
 819 }
 820
 821 bool wxThread::TestDestroy()
 822 {
 823     return m_internal->GetState() == STATE_CANCELED;
 824 }
 825
 826 // ----------------------------------------------------------------------------
 827 // Automatic initialization for thread module
 828 // ----------------------------------------------------------------------------
 829
 830 class wxThreadModule : public wxModule
 831 {
 832 public:
 833     virtual bool OnInit();
 834     virtual void OnExit();
 835
 836 private:
 837     DECLARE_DYNAMIC_CLASS(wxThreadModule)
 838 };
 839
 840 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 841
 842 bool wxThreadModule::OnInit()
 843 {
 844     long response;
 845     bool hasThreadManager ;
 846     hasThreadManager = Gestalt( gestaltThreadMgrAttr, &response) == noErr && response & 1;
 847 #if !TARGET_CARBON
 848 #if GENERATINGCFM
 849     // verify presence of shared library
 850     hasThreadManager = hasThreadManager && ((Ptr)NewThread != (Ptr)kUnresolvedCFragSymbolAddress);
 851 #endif
 852 #endif
 853     if ( !hasThreadManager )
 854     {
 855         wxMessageBox( "Error" , "Thread Support is not available on this System" , wxOK ) ;
 856         return FALSE ;
 857     }
 858
 859     // no error return for GetCurrentThreadId()
 860     MacGetCurrentThread( &gs_idMainThread ) ;
 861
 862     return TRUE;
 863 }
 864
 865 void wxThreadModule::OnExit()
 866 {
 867 }
 868
 869 // ----------------------------------------------------------------------------
 870 // under MacOS we don't have currently preemptive threads, so any thread may access
 871 // the GUI at any time
 872 // ----------------------------------------------------------------------------
 873
 874 void WXDLLEXPORT wxMutexGuiEnter()
 875 {
 876 }
 877
 878 void WXDLLEXPORT wxMutexGuiLeave()
 879 {
 880 }
 881
 882 void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
 883 {
 884 }
 885
 886 bool WXDLLEXPORT wxGuiOwnedByMainThread()
 887 {
 888     return false ;
 889 }
 890
 891 // wake up the main thread
 892 void WXDLLEXPORT wxWakeUpMainThread()
 893 {
 894     wxMacWakeUp() ;
 895 }
 896
 897 bool WXDLLEXPORT wxIsWaitingForThread()
 898 {
 899     return false ;
 900 }
 901
 902 #include "wx/thrimpl.cpp"
 903
 904 #endif // wxUSE_THREADS