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     m_state = STATE_NEW;
 437
 438     return TRUE;
 439 }
 440
 441 bool wxThreadInternal::Suspend()
 442 {
 443     OSErr err ;
 444
 445     ::ThreadBeginCritical();
 446
 447     if ( m_state != STATE_RUNNING )
 448     {
 449         ::ThreadEndCritical() ;
 450         wxLogSysError(_("Can not suspend thread %x"), m_tid);
 451         return FALSE;
 452     }
 453
 454     m_state = STATE_PAUSED;
 455
 456     err = ::SetThreadStateEndCritical(m_tid, kStoppedThreadState, kNoThreadID);
 457
 458     return TRUE;
 459 }
 460
 461 bool wxThreadInternal::Resume()
 462 {
 463     ThreadID current ;
 464     OSErr err ;
 465     err = MacGetCurrentThread( &current ) ;
 466
 467     wxASSERT( err == noErr ) ;
 468     wxASSERT( current != m_tid ) ;
 469
 470     ::ThreadBeginCritical();
 471     if ( m_state != STATE_PAUSED && m_state != STATE_NEW )
 472     {
 473         ::ThreadEndCritical() ;
 474         wxLogSysError(_("Can not resume thread %x"), m_tid);
 475         return FALSE;
 476
 477     }
 478     err = ::SetThreadStateEndCritical(m_tid, kReadyThreadState, kNoThreadID);
 479     wxASSERT( err == noErr ) ;
 480
 481     m_state = STATE_RUNNING;
 482     ::ThreadEndCritical() ;
 483     ::YieldToAnyThread() ;
 484     return TRUE;
 485 }
 486
 487 // static functions
 488 // ----------------
 489 wxThread *wxThread::This()
 490 {
 491     wxMacStCritical critical ;
 492
 493     ThreadID current ;
 494     OSErr err ;
 495
 496     err = MacGetCurrentThread( &current ) ;
 497
 498     for ( size_t i = 0 ; i < s_threads.Count() ; ++i )
 499     {
 500         if ( ( (wxThread*) s_threads[i] )->GetId() == current )
 501             return (wxThread*) s_threads[i] ;
 502     }
 503
 504     wxLogSysError(_("Couldn't get the current thread pointer"));
 505     return NULL;
 506 }
 507
 508 bool wxThread::IsMain()
 509 {
 510     ThreadID current ;
 511     OSErr err ;
 512
 513     err = MacGetCurrentThread( &current ) ;
 514     return current == gs_idMainThread;
 515 }
 516
 517 #ifdef Yield
 518 #undef Yield
 519 #endif
 520
 521 void wxThread::Yield()
 522 {
 523     ::YieldToAnyThread() ;
 524 }
 525
 526 void wxThread::Sleep(unsigned long milliseconds)
 527 {
 528     clock_t start = clock();
 529     do
 530     {
 531         YieldToAnyThread();
 532     } while( clock() - start < milliseconds /  1000.0 * CLOCKS_PER_SEC ) ;
 533 }
 534
 535 int wxThread::GetCPUCount()
 536 {
 537     // we will use whatever MP API will be used for the new MP Macs
 538     return 1;
 539 }
 540
 541 unsigned long wxThread::GetCurrentId()
 542 {
 543     ThreadID current ;
 544     MacGetCurrentThread( &current ) ;
 545     return (unsigned long)current;
 546 }
 547
 548 bool wxThread::SetConcurrency(size_t level)
 549 {
 550     wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
 551
 552     // ok only for the default one
 553     if ( level == 0 )
 554         return 0;
 555
 556     // how many CPUs have we got?
 557     if ( GetCPUCount() == 1 )
 558     {
 559         // don't bother with all this complicated stuff - on a single
 560         // processor system it doesn't make much sense anyhow
 561         return level == 1;
 562     }
 563
 564     return TRUE ;
 565 }
 566
 567 // ctor and dtor
 568 // -------------
 569
 570 wxThread::wxThread(wxThreadKind kind)
 571 {
 572     m_internal = new wxThreadInternal();
 573
 574     m_isDetached = kind == wxTHREAD_DETACHED;
 575     s_threads.Add( (void*) this ) ;
 576 }
 577
 578 wxThread::~wxThread()
 579 {
 580     s_threads.Remove( (void*) this ) ;
 581     if (m_internal != NULL) {
 582         delete m_internal;
 583         m_internal = NULL;
 584     }
 585 }
 586
 587 // create/start thread
 588 // -------------------
 589
 590 wxThreadError wxThread::Create(unsigned int stackSize)
 591 {
 592     wxCriticalSectionLocker lock(m_critsect);
 593
 594     if ( !m_internal->Create(this, stackSize) )
 595         return wxTHREAD_NO_RESOURCE;
 596
 597     return wxTHREAD_NO_ERROR;
 598 }
 599
 600 wxThreadError wxThread::Run()
 601 {
 602     wxCriticalSectionLocker lock(m_critsect);
 603
 604     if ( m_internal->GetState() != STATE_NEW )
 605     {
 606         // actually, it may be almost any state at all, not only STATE_RUNNING
 607         return wxTHREAD_RUNNING;
 608     }
 609
 610     // the thread has just been created and is still suspended - let it run
 611     return Resume();
 612 }
 613
 614 // suspend/resume thread
 615 // ---------------------
 616
 617 wxThreadError wxThread::Pause()
 618 {
 619     wxCriticalSectionLocker lock(m_critsect);
 620
 621     return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 622 }
 623
 624 wxThreadError wxThread::Resume()
 625 {
 626     wxCriticalSectionLocker lock(m_critsect);
 627
 628     return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 629 }
 630
 631 // stopping thread
 632 // ---------------
 633
 634 wxThread::ExitCode wxThread::Wait()
 635 {
 636     // although under MacOS we can wait for any thread, it's an error to
 637     // wait for a detached one in wxWin API
 638     wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
 639                  _T("can't wait for detached thread") );
 640
 641     ExitCode rc = (ExitCode)-1;
 642
 643     (void)Delete(&rc);
 644
 645     m_internal->Free();
 646
 647     return rc;
 648 }
 649
 650 wxThreadError wxThread::Delete(ExitCode *pRc)
 651 {
 652     ExitCode rc = 0;
 653
 654     // Delete() is always safe to call, so consider all possible states
 655
 656     // has the thread started to run?
 657     bool shouldResume = FALSE;
 658
 659     {
 660         wxCriticalSectionLocker lock(m_critsect);
 661
 662         if ( m_internal->GetState() == STATE_NEW )
 663         {
 664             // WinThreadStart() will see it and terminate immediately
 665             m_internal->SetState(STATE_EXITED);
 666
 667             shouldResume = TRUE;
 668         }
 669     }
 670
 671     // is the thread paused?
 672     if ( shouldResume || IsPaused() )
 673         Resume();
 674
 675     // does is still run?
 676     if ( IsRunning() )
 677     {
 678         if ( IsMain() )
 679         {
 680             // set flag for wxIsWaitingForThread()
 681             gs_waitingForThread = TRUE;
 682
 683 #if wxUSE_GUI
 684             wxBeginBusyCursor();
 685 #endif // wxUSE_GUI
 686         }
 687
 688         // ask the thread to terminate
 689         {
 690             wxCriticalSectionLocker lock(m_critsect);
 691
 692             m_internal->Cancel();
 693         }
 694
 695 #if wxUSE_GUI
 696         // simply wait for the thread to terminate
 697         while( TestDestroy() )
 698         {
 699             ::YieldToAnyThread() ;
 700         }
 701 #else // !wxUSE_GUI
 702         // simply wait for the thread to terminate
 703         while( TestDestroy() )
 704         {
 705             ::YieldToAnyThread() ;
 706         }
 707 #endif // wxUSE_GUI/!wxUSE_GUI
 708
 709         if ( IsMain() )
 710         {
 711             gs_waitingForThread = FALSE;
 712
 713 #if wxUSE_GUI
 714             wxEndBusyCursor();
 715 #endif // wxUSE_GUI
 716         }
 717     }
 718
 719     if ( IsDetached() )
 720     {
 721         // if the thread exits normally, this is done in WinThreadStart, but in
 722         // this case it would have been too early because
 723         // MsgWaitForMultipleObject() would fail if the therad handle was
 724         // closed while we were waiting on it, so we must do it here
 725         delete this;
 726     }
 727
 728     if ( pRc )
 729         *pRc = rc;
 730
 731     return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
 732 }
 733
 734 wxThreadError wxThread::Kill()
 735 {
 736     if ( !IsRunning() )
 737         return wxTHREAD_NOT_RUNNING;
 738
 739 //    if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
 740     {
 741         wxLogSysError(_("Couldn't terminate thread"));
 742
 743         return wxTHREAD_MISC_ERROR;
 744     }
 745
 746     m_internal->Free();
 747
 748     if ( IsDetached() )
 749     {
 750         delete this;
 751     }
 752
 753     return wxTHREAD_NO_ERROR;
 754 }
 755
 756 void wxThread::Exit(ExitCode status)
 757 {
 758     m_internal->Free();
 759
 760     if ( IsDetached() )
 761     {
 762         delete this;
 763     }
 764
 765     m_internal->SetResult( status ) ;
 766
 767 /*
 768 #if defined(__VISUALC__) || (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500))
 769     _endthreadex((unsigned)status);
 770 #else // !VC++
 771     ::ExitThread((DWORD)status);
 772 #endif // VC++/!VC++
 773 */
 774     wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
 775 }
 776
 777 // priority setting
 778 // ----------------
 779
 780 // since all these calls are execute cooperatively we don't have to use the critical section
 781
 782 void wxThread::SetPriority(unsigned int prio)
 783 {
 784     m_internal->SetPriority(prio);
 785 }
 786
 787 unsigned int wxThread::GetPriority() const
 788 {
 789     return m_internal->GetPriority();
 790 }
 791
 792 unsigned long wxThread::GetId() const
 793 {
 794     return (unsigned long)m_internal->GetId();
 795 }
 796
 797 bool wxThread::IsRunning() const
 798 {
 799     return m_internal->GetState() == STATE_RUNNING;
 800 }
 801
 802 bool wxThread::IsAlive() const
 803 {
 804     return (m_internal->GetState() == STATE_RUNNING) ||
 805            (m_internal->GetState() == STATE_PAUSED);
 806 }
 807
 808 bool wxThread::IsPaused() const
 809 {
 810     return m_internal->GetState() == STATE_PAUSED;
 811 }
 812
 813 bool wxThread::TestDestroy()
 814 {
 815     return m_internal->GetState() == STATE_CANCELED;
 816 }
 817
 818 // ----------------------------------------------------------------------------
 819 // Automatic initialization for thread module
 820 // ----------------------------------------------------------------------------
 821
 822 class wxThreadModule : public wxModule
 823 {
 824 public:
 825     virtual bool OnInit();
 826     virtual void OnExit();
 827
 828 private:
 829     DECLARE_DYNAMIC_CLASS(wxThreadModule)
 830 };
 831
 832 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 833
 834 bool wxThreadModule::OnInit()
 835 {
 836     long response;
 837     bool hasThreadManager ;
 838     hasThreadManager = Gestalt( gestaltThreadMgrAttr, &response) == noErr && response & 1;
 839 #if !TARGET_CARBON
 840 #if GENERATINGCFM
 841     // verify presence of shared library
 842     hasThreadManager = hasThreadManager && ((Ptr)NewThread != (Ptr)kUnresolvedCFragSymbolAddress);
 843 #endif
 844 #endif
 845     if ( !hasThreadManager )
 846     {
 847         wxMessageBox( wxT("Error") , wxT("Thread Support is not available on this System") , wxOK ) ;
 848         return FALSE ;
 849     }
 850
 851     // no error return for GetCurrentThreadId()
 852     MacGetCurrentThread( &gs_idMainThread ) ;
 853
 854     return TRUE;
 855 }
 856
 857 void wxThreadModule::OnExit()
 858 {
 859 }
 860
 861 // ----------------------------------------------------------------------------
 862 // under MacOS we don't have currently preemptive threads, so any thread may access
 863 // the GUI at any time
 864 // ----------------------------------------------------------------------------
 865
 866 void WXDLLEXPORT wxMutexGuiEnter()
 867 {
 868 }
 869
 870 void WXDLLEXPORT wxMutexGuiLeave()
 871 {
 872 }
 873
 874 void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
 875 {
 876 }
 877
 878 bool WXDLLEXPORT wxGuiOwnedByMainThread()
 879 {
 880     return false ;
 881 }
 882
 883 // wake up the main thread
 884 void WXDLLEXPORT wxWakeUpMainThread()
 885 {
 886     wxMacWakeUp() ;
 887 }
 888
 889 bool WXDLLEXPORT wxIsWaitingForThread()
 890 {
 891     return false ;
 892 }
 893
 894 #include "wx/thrimpl.cpp"
 895
 896 #endif // wxUSE_THREADS