src/mac/classic/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 #include "wx/mac/macnotfy.h"
  41 #include <Timer.h>
  42 #endif
  43
  44 #define INFINITE 0xFFFFFFFF
  45
  46
  47 // ----------------------------------------------------------------------------
  48 // constants
  49 // ----------------------------------------------------------------------------
  50
  51 // the possible states of the thread ("=>" shows all possible transitions from
  52 // this state)
  53 enum wxThreadState
  54 {
  55     STATE_NEW,          // didn't start execution yet (=> RUNNING)
  56     STATE_RUNNING,      // thread is running (=> PAUSED, CANCELED)
  57     STATE_PAUSED,       // thread is temporarily suspended (=> RUNNING)
  58     STATE_CANCELED,     // thread should terminate a.s.a.p. (=> EXITED)
  59     STATE_EXITED        // thread is terminating
  60 };
  61
  62 // ----------------------------------------------------------------------------
  63 // this module globals
  64 // ----------------------------------------------------------------------------
  65
  66 static ThreadID gs_idMainThread = kNoThreadID ;
  67 static bool gs_waitingForThread = FALSE ;
  68 size_t g_numberOfThreads = 0;
  69
  70 // ============================================================================
  71 // MacOS implementation of thread classes
  72 // ============================================================================
  73
  74 class wxMacStCritical
  75 {
  76 public :
  77     wxMacStCritical()
  78     {
  79         if ( UMASystemIsInitialized() )
  80             ThreadBeginCritical() ;
  81     }
  82     ~wxMacStCritical()
  83     {
  84         if ( UMASystemIsInitialized() )
  85             ThreadEndCritical() ;
  86     }
  87 };
  88
  89 // ----------------------------------------------------------------------------
  90 // wxMutex implementation
  91 // ----------------------------------------------------------------------------
  92
  93 class wxMutexInternal
  94 {
  95 public:
  96     wxMutexInternal(wxMutexType WXUNUSED(mutexType))
  97     {
  98         m_owner = kNoThreadID ;
  99         m_locked = 0;
 100     }
 101
 102     ~wxMutexInternal()
 103     {
 104         if ( m_locked > 0 )
 105         {
 106             wxLogDebug(_T("Warning: freeing a locked mutex (%ld locks)."), m_locked);
 107         }
 108     }
 109
 110     bool IsOk() const { return true; }
 111
 112     wxMutexError Lock() ;
 113     wxMutexError TryLock() ;
 114     wxMutexError Unlock();
 115 public:
 116     ThreadID m_owner ;
 117     wxArrayLong m_waiters ;
 118     long m_locked ;
 119 };
 120
 121 wxMutexError wxMutexInternal::Lock()
 122 {
 123     wxMacStCritical critical ;
 124     if ( UMASystemIsInitialized() )
 125     {
 126         OSErr err ;
 127         ThreadID current = kNoThreadID;
 128         err = ::MacGetCurrentThread(&current);
 129         // if we are not the owner, add this thread to the list of waiting threads, stop this thread
 130         // and invoke the scheduler to continue executing the owner's thread
 131         while ( m_owner != kNoThreadID && m_owner != current)
 132         {
 133             m_waiters.Add(current);
 134             err = ::SetThreadStateEndCritical(kCurrentThreadID, kStoppedThreadState, m_owner);
 135             err = ::ThreadBeginCritical();
 136         }
 137         m_owner = current;
 138     }
 139     m_locked++;
 140
 141     return wxMUTEX_NO_ERROR;
 142 }
 143
 144 wxMutexError wxMutexInternal::TryLock()
 145 {
 146     wxMacStCritical critical ;
 147     if ( UMASystemIsInitialized() )
 148     {
 149         ThreadID current = kNoThreadID;
 150         ::MacGetCurrentThread(&current);
 151         // if we are not the owner, give an error back
 152         if ( m_owner != kNoThreadID && m_owner != current )
 153             return wxMUTEX_BUSY;
 154
 155         m_owner = current;
 156     }
 157     m_locked++;
 158
 159    return wxMUTEX_NO_ERROR;
 160 }
 161
 162 wxMutexError wxMutexInternal::Unlock()
 163 {
 164     if ( UMASystemIsInitialized() )
 165     {
 166         OSErr err;
 167         err = ::ThreadBeginCritical();
 168
 169         if (m_locked > 0)
 170             m_locked--;
 171
 172         // this mutex is not owned by anybody anmore
 173         m_owner = kNoThreadID;
 174
 175         // now pass on to the first waiting thread
 176         ThreadID firstWaiting = kNoThreadID;
 177         bool found = false;
 178         while (!m_waiters.IsEmpty() && !found)
 179         {
 180             firstWaiting = m_waiters[0];
 181             err = ::SetThreadState(firstWaiting, kReadyThreadState, kNoThreadID);
 182             // in case this was not successful (dead thread), we just loop on and reset the id
 183             found = (err != threadNotFoundErr);
 184             if ( !found )
 185                 firstWaiting = kNoThreadID ;
 186             m_waiters.RemoveAt(0) ;
 187         }
 188         // now we have a valid firstWaiting thread, which has been scheduled to run next, just end the
 189         // critical section and invoke the scheduler
 190         err = ::SetThreadStateEndCritical(kCurrentThreadID, kReadyThreadState, firstWaiting);
 191     }
 192     else
 193     {
 194         if (m_locked > 0)
 195             m_locked--;
 196     }
 197     return wxMUTEX_NO_ERROR;
 198 }
 199
 200 // --------------------------------------------------------------------------
 201 // wxSemaphore
 202 // --------------------------------------------------------------------------
 203
 204 // TODO not yet implemented
 205
 206 class wxSemaphoreInternal
 207 {
 208 public:
 209     wxSemaphoreInternal(int initialcount, int maxcount);
 210     ~wxSemaphoreInternal();
 211
 212     bool IsOk() const { return true ; }
 213
 214     wxSemaError Wait() { return WaitTimeout(INFINITE); }
 215     wxSemaError TryWait() { return WaitTimeout(0); }
 216     wxSemaError WaitTimeout(unsigned long milliseconds);
 217
 218     wxSemaError Post();
 219
 220 private:
 221 };
 222
 223 wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
 224 {
 225     if ( maxcount == 0 )
 226     {
 227         // make it practically infinite
 228         maxcount = INT_MAX;
 229     }
 230 }
 231
 232 wxSemaphoreInternal::~wxSemaphoreInternal()
 233 {
 234 }
 235
 236 wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long milliseconds)
 237 {
 238     return wxSEMA_MISC_ERROR;
 239 }
 240
 241 wxSemaError wxSemaphoreInternal::Post()
 242 {
 243     return wxSEMA_MISC_ERROR;
 244 }
 245
 246 // ----------------------------------------------------------------------------
 247 // wxCondition implementation
 248 // ----------------------------------------------------------------------------
 249
 250 // TODO this is not yet completed
 251
 252 class wxConditionInternal
 253 {
 254 public:
 255     wxConditionInternal(wxMutex& mutex) : m_mutex(mutex)
 256     {
 257         m_excessSignals = 0 ;
 258     }
 259     ~wxConditionInternal()
 260     {
 261     }
 262
 263     bool IsOk() const { return m_mutex.IsOk() ; }
 264
 265     wxCondError Wait()
 266     {
 267         return WaitTimeout(0xFFFFFFFF );
 268     }
 269
 270     wxCondError WaitTimeout(unsigned long msectimeout)
 271     {
 272         wxMacStCritical critical ;
 273         if ( m_excessSignals > 0 )
 274         {
 275             --m_excessSignals ;
 276             return wxCOND_NO_ERROR ;
 277         }
 278         else if ( msectimeout == 0 )
 279         {
 280             return wxCOND_MISC_ERROR ;
 281         }
 282         else
 283         {
 284         }
 285         /*
 286         waiters++;
 287
 288         // FIXME this should be MsgWaitForMultipleObjects() as well probably
 289         DWORD rc = ::WaitForSingleObject(event, timeout);
 290
 291         waiters--;
 292
 293         return rc != WAIT_TIMEOUT;
 294         */
 295         return wxCOND_NO_ERROR ;
 296     }
 297     wxCondError Signal()
 298     {
 299         wxMacStCritical critical ;
 300         return wxCOND_NO_ERROR;
 301     }
 302
 303     wxCondError Broadcast()
 304     {
 305         wxMacStCritical critical ;
 306         return wxCOND_NO_ERROR;
 307     }
 308
 309     wxArrayLong m_waiters ;
 310     wxInt32     m_excessSignals ;
 311     wxMutex&    m_mutex;
 312 };
 313
 314 // ----------------------------------------------------------------------------
 315 // wxCriticalSection implementation
 316 // ----------------------------------------------------------------------------
 317
 318 // it's implemented as a mutex on mac os, so it is defined in the headers
 319
 320 // ----------------------------------------------------------------------------
 321 // wxThread implementation
 322 // ----------------------------------------------------------------------------
 323
 324 // wxThreadInternal class
 325 // ----------------------
 326
 327 class wxThreadInternal
 328 {
 329 public:
 330     wxThreadInternal()
 331     {
 332         m_tid = kNoThreadID ;
 333         m_state = STATE_NEW;
 334         m_priority = WXTHREAD_DEFAULT_PRIORITY;
 335     }
 336
 337     ~wxThreadInternal()
 338     {
 339     }
 340
 341     void Free()
 342     {
 343     }
 344
 345     // create a new (suspended) thread (for the given thread object)
 346     bool Create(wxThread *thread, unsigned int stackSize);
 347
 348     // suspend/resume/terminate
 349     bool Suspend();
 350     bool Resume();
 351     void Cancel() { m_state = STATE_CANCELED; }
 352
 353     // thread state
 354     void SetState(wxThreadState state) { m_state = state; }
 355     wxThreadState GetState() const { return m_state; }
 356
 357     // thread priority
 358     void SetPriority(unsigned int priority);
 359     unsigned int GetPriority() const { return m_priority; }
 360
 361     void SetResult( void *res ) { m_result = res ; }
 362     void *GetResult() { return m_result ; }
 363
 364     // thread handle and id
 365     ThreadID  GetId() const { return m_tid; }
 366
 367     // thread function
 368     static pascal void*    MacThreadStart(wxThread* arg);
 369
 370 private:
 371     wxThreadState           m_state;      // state, see wxThreadState enum
 372     unsigned int            m_priority;   // thread priority in "wx" units
 373     ThreadID                m_tid;        // thread id
 374     void*                   m_result;
 375     static ThreadEntryUPP   s_threadEntry ;
 376 };
 377
 378 static wxArrayPtrVoid s_threads ;
 379
 380 ThreadEntryUPP wxThreadInternal::s_threadEntry = NULL ;
 381 pascal void* wxThreadInternal::MacThreadStart(wxThread *thread)
 382 {
 383     // first of all, check whether we hadn't been cancelled already
 384     if ( thread->m_internal->GetState() == STATE_EXITED )
 385     {
 386         return (void*)-1;
 387     }
 388
 389     void* rc = thread->Entry();
 390
 391     // enter m_critsect before changing the thread state
 392     thread->m_critsect.Enter();
 393     bool wasCancelled = thread->m_internal->GetState() == STATE_CANCELED;
 394     thread->m_internal->SetState(STATE_EXITED);
 395     thread->m_critsect.Leave();
 396
 397     thread->OnExit();
 398
 399     // if the thread was cancelled (from Delete()), then it the handle is still
 400     // needed there
 401     if ( thread->IsDetached() && !wasCancelled )
 402     {
 403         // auto delete
 404         delete thread;
 405     }
 406     //else: the joinable threads handle will be closed when Wait() is done
 407
 408     return rc;
 409 }
 410 void wxThreadInternal::SetPriority(unsigned int priority)
 411 {
 412     // Priorities don't exist on Mac
 413 }
 414
 415 bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize)
 416 {
 417     if ( s_threadEntry == NULL )
 418     {
 419         s_threadEntry = NewThreadEntryUPP( (ThreadEntryProcPtr) MacThreadStart ) ;
 420     }
 421     OSErr err = NewThread( kCooperativeThread,
 422                            s_threadEntry,
 423                            (void*) thread,
 424                            stackSize,
 425                            kNewSuspend,
 426                            &m_result,
 427                            &m_tid );
 428
 429     if ( err != noErr )
 430     {
 431         wxLogSysError(_("Can't create thread"));
 432         return FALSE;
 433     }
 434
 435     if ( m_priority != WXTHREAD_DEFAULT_PRIORITY )
 436     {
 437         SetPriority(m_priority);
 438     }
 439
 440     m_state = STATE_NEW;
 441
 442     return TRUE;
 443 }
 444
 445 bool wxThreadInternal::Suspend()
 446 {
 447     OSErr err ;
 448
 449     ::ThreadBeginCritical();
 450
 451     if ( m_state != STATE_RUNNING )
 452     {
 453         ::ThreadEndCritical() ;
 454         wxLogSysError(_("Can not suspend thread %x"), m_tid);
 455         return FALSE;
 456     }
 457
 458     m_state = STATE_PAUSED;
 459
 460     err = ::SetThreadStateEndCritical(m_tid, kStoppedThreadState, kNoThreadID);
 461
 462     return TRUE;
 463 }
 464
 465 bool wxThreadInternal::Resume()
 466 {
 467     ThreadID current ;
 468     OSErr err ;
 469     err = MacGetCurrentThread( &current ) ;
 470
 471     wxASSERT( err == noErr ) ;
 472     wxASSERT( current != m_tid ) ;
 473
 474     ::ThreadBeginCritical();
 475     if ( m_state != STATE_PAUSED && m_state != STATE_NEW )
 476     {
 477         ::ThreadEndCritical() ;
 478         wxLogSysError(_("Can not resume thread %x"), m_tid);
 479         return FALSE;
 480
 481     }
 482     err = ::SetThreadStateEndCritical(m_tid, kReadyThreadState, kNoThreadID);
 483     wxASSERT( err == noErr ) ;
 484
 485     m_state = STATE_RUNNING;
 486     ::ThreadEndCritical() ;
 487     ::YieldToAnyThread() ;
 488     return TRUE;
 489 }
 490
 491 // static functions
 492 // ----------------
 493 wxThread *wxThread::This()
 494 {
 495     wxMacStCritical critical ;
 496
 497     ThreadID current ;
 498     OSErr err ;
 499
 500     err = MacGetCurrentThread( &current ) ;
 501
 502     for ( size_t i = 0 ; i < s_threads.Count() ; ++i )
 503     {
 504         if ( ( (wxThread*) s_threads[i] )->GetId() == current )
 505             return (wxThread*) s_threads[i] ;
 506     }
 507
 508     wxLogSysError(_("Couldn't get the current thread pointer"));
 509     return NULL;
 510 }
 511
 512 bool wxThread::IsMain()
 513 {
 514     ThreadID current ;
 515     OSErr err ;
 516
 517     err = MacGetCurrentThread( &current ) ;
 518     return current == gs_idMainThread;
 519 }
 520
 521 #ifdef Yield
 522 #undef Yield
 523 #endif
 524
 525 void wxThread::Yield()
 526 {
 527     ::YieldToAnyThread() ;
 528 }
 529
 530 void wxThread::Sleep(unsigned long milliseconds)
 531 {
 532     UnsignedWide start, now;
 533
 534     Microseconds(&start);
 535
 536     double mssleep = milliseconds * 1000 ;
 537     double msstart, msnow ;
 538     msstart = (start.hi * 4294967296.0 + start.lo) ;
 539
 540     do
 541     {
 542         YieldToAnyThread();
 543         Microseconds(&now);
 544         msnow = (now.hi * 4294967296.0 + now.lo) ;
 545     } while( msnow - msstart < mssleep );
 546 }
 547
 548 int wxThread::GetCPUCount()
 549 {
 550     // we will use whatever MP API will be used for the new MP Macs
 551     return 1;
 552 }
 553
 554 unsigned long wxThread::GetCurrentId()
 555 {
 556     ThreadID current ;
 557     MacGetCurrentThread( &current ) ;
 558     return (unsigned long)current;
 559 }
 560
 561 bool wxThread::SetConcurrency(size_t level)
 562 {
 563     wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
 564
 565     // ok only for the default one
 566     if ( level == 0 )
 567         return 0;
 568
 569     // how many CPUs have we got?
 570     if ( GetCPUCount() == 1 )
 571     {
 572         // don't bother with all this complicated stuff - on a single
 573         // processor system it doesn't make much sense anyhow
 574         return level == 1;
 575     }
 576
 577     return TRUE ;
 578 }
 579
 580 // ctor and dtor
 581 // -------------
 582
 583 wxThread::wxThread(wxThreadKind kind)
 584 {
 585     g_numberOfThreads++;
 586     m_internal = new wxThreadInternal();
 587
 588     m_isDetached = kind == wxTHREAD_DETACHED;
 589     s_threads.Add( (void*) this ) ;
 590 }
 591
 592 wxThread::~wxThread()
 593 {
 594     if (g_numberOfThreads>0)
 595     {
 596         g_numberOfThreads--;
 597     }
 598 #ifdef __WXDEBUG__
 599     else
 600     {
 601         wxFAIL_MSG(wxT("More threads deleted than created."));
 602     }
 603 #endif
 604
 605     s_threads.Remove( (void*) this ) ;
 606     if (m_internal != NULL) {
 607         delete m_internal;
 608         m_internal = NULL;
 609     }
 610 }
 611
 612 // create/start thread
 613 // -------------------
 614
 615 wxThreadError wxThread::Create(unsigned int stackSize)
 616 {
 617     wxCriticalSectionLocker lock(m_critsect);
 618
 619     if ( !m_internal->Create(this, stackSize) )
 620         return wxTHREAD_NO_RESOURCE;
 621
 622     return wxTHREAD_NO_ERROR;
 623 }
 624
 625 wxThreadError wxThread::Run()
 626 {
 627     wxCriticalSectionLocker lock(m_critsect);
 628
 629     if ( m_internal->GetState() != STATE_NEW )
 630     {
 631         // actually, it may be almost any state at all, not only STATE_RUNNING
 632         return wxTHREAD_RUNNING;
 633     }
 634
 635     // the thread has just been created and is still suspended - let it run
 636     return Resume();
 637 }
 638
 639 // suspend/resume thread
 640 // ---------------------
 641
 642 wxThreadError wxThread::Pause()
 643 {
 644     wxCriticalSectionLocker lock(m_critsect);
 645
 646     return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 647 }
 648
 649 wxThreadError wxThread::Resume()
 650 {
 651     wxCriticalSectionLocker lock(m_critsect);
 652
 653     return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 654 }
 655
 656 // stopping thread
 657 // ---------------
 658
 659 wxThread::ExitCode wxThread::Wait()
 660 {
 661     // although under MacOS we can wait for any thread, it's an error to
 662     // wait for a detached one in wxWin API
 663     wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
 664                  _T("can't wait for detached thread") );
 665
 666     ExitCode rc = (ExitCode)-1;
 667
 668     (void)Delete(&rc);
 669
 670     m_internal->Free();
 671
 672     return rc;
 673 }
 674
 675 wxThreadError wxThread::Delete(ExitCode *pRc)
 676 {
 677     ExitCode rc = 0;
 678
 679     // Delete() is always safe to call, so consider all possible states
 680
 681     // has the thread started to run?
 682     bool shouldResume = FALSE;
 683
 684     {
 685         wxCriticalSectionLocker lock(m_critsect);
 686
 687         if ( m_internal->GetState() == STATE_NEW )
 688         {
 689             // WinThreadStart() will see it and terminate immediately
 690             m_internal->SetState(STATE_EXITED);
 691
 692             shouldResume = TRUE;
 693         }
 694     }
 695
 696     // is the thread paused?
 697     if ( shouldResume || IsPaused() )
 698         Resume();
 699
 700     // does is still run?
 701     if ( IsRunning() )
 702     {
 703         if ( IsMain() )
 704         {
 705             // set flag for wxIsWaitingForThread()
 706             gs_waitingForThread = TRUE;
 707
 708 #if wxUSE_GUI
 709             wxBeginBusyCursor();
 710 #endif // wxUSE_GUI
 711         }
 712
 713         // ask the thread to terminate
 714         {
 715             wxCriticalSectionLocker lock(m_critsect);
 716
 717             m_internal->Cancel();
 718         }
 719
 720 #if wxUSE_GUI
 721         // simply wait for the thread to terminate
 722         while( TestDestroy() )
 723         {
 724             ::YieldToAnyThread() ;
 725         }
 726 #else // !wxUSE_GUI
 727         // simply wait for the thread to terminate
 728         while( TestDestroy() )
 729         {
 730             ::YieldToAnyThread() ;
 731         }
 732 #endif // wxUSE_GUI/!wxUSE_GUI
 733
 734         if ( IsMain() )
 735         {
 736             gs_waitingForThread = FALSE;
 737
 738 #if wxUSE_GUI
 739             wxEndBusyCursor();
 740 #endif // wxUSE_GUI
 741         }
 742     }
 743
 744     if ( IsDetached() )
 745     {
 746         // if the thread exits normally, this is done in WinThreadStart, but in
 747         // this case it would have been too early because
 748         // MsgWaitForMultipleObject() would fail if the therad handle was
 749         // closed while we were waiting on it, so we must do it here
 750         delete this;
 751     }
 752
 753     if ( pRc )
 754         *pRc = rc;
 755
 756     return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
 757 }
 758
 759 wxThreadError wxThread::Kill()
 760 {
 761     if ( !IsRunning() )
 762         return wxTHREAD_NOT_RUNNING;
 763
 764 //    if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
 765     {
 766         wxLogSysError(_("Couldn't terminate thread"));
 767
 768         return wxTHREAD_MISC_ERROR;
 769     }
 770
 771     m_internal->Free();
 772
 773     if ( IsDetached() )
 774     {
 775         delete this;
 776     }
 777
 778     return wxTHREAD_NO_ERROR;
 779 }
 780
 781 void wxThread::Exit(ExitCode status)
 782 {
 783     m_internal->Free();
 784
 785     if ( IsDetached() )
 786     {
 787         delete this;
 788     }
 789
 790     m_internal->SetResult( status ) ;
 791
 792 /*
 793 #if defined(__VISUALC__) || (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500))
 794     _endthreadex((unsigned)status);
 795 #else // !VC++
 796     ::ExitThread((DWORD)status);
 797 #endif // VC++/!VC++
 798 */
 799     wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
 800 }
 801
 802 // priority setting
 803 // ----------------
 804
 805 // since all these calls are execute cooperatively we don't have to use the critical section
 806
 807 void wxThread::SetPriority(unsigned int prio)
 808 {
 809     m_internal->SetPriority(prio);
 810 }
 811
 812 unsigned int wxThread::GetPriority() const
 813 {
 814     return m_internal->GetPriority();
 815 }
 816
 817 unsigned long wxThread::GetId() const
 818 {
 819     return (unsigned long)m_internal->GetId();
 820 }
 821
 822 bool wxThread::IsRunning() const
 823 {
 824     return m_internal->GetState() == STATE_RUNNING;
 825 }
 826
 827 bool wxThread::IsAlive() const
 828 {
 829     return (m_internal->GetState() == STATE_RUNNING) ||
 830            (m_internal->GetState() == STATE_PAUSED);
 831 }
 832
 833 bool wxThread::IsPaused() const
 834 {
 835     return m_internal->GetState() == STATE_PAUSED;
 836 }
 837
 838 bool wxThread::TestDestroy()
 839 {
 840     return m_internal->GetState() == STATE_CANCELED;
 841 }
 842
 843 // ----------------------------------------------------------------------------
 844 // Automatic initialization for thread module
 845 // ----------------------------------------------------------------------------
 846
 847 class wxThreadModule : public wxModule
 848 {
 849 public:
 850     virtual bool OnInit();
 851     virtual void OnExit();
 852
 853 private:
 854     DECLARE_DYNAMIC_CLASS(wxThreadModule)
 855 };
 856
 857 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 858
 859 bool wxThreadModule::OnInit()
 860 {
 861     long response;
 862     bool hasThreadManager ;
 863     hasThreadManager = Gestalt( gestaltThreadMgrAttr, &response) == noErr && response & 1;
 864 #if !TARGET_CARBON
 865 #if GENERATINGCFM
 866     // verify presence of shared library
 867     hasThreadManager = hasThreadManager && ((Ptr)NewThread != (Ptr)kUnresolvedCFragSymbolAddress);
 868 #endif
 869 #endif
 870     if ( !hasThreadManager )
 871     {
 872         wxLogSysError( wxT("Thread Support is not available on this System") );
 873         return FALSE ;
 874     }
 875
 876     // no error return for GetCurrentThreadId()
 877     MacGetCurrentThread( &gs_idMainThread ) ;
 878
 879     return TRUE;
 880 }
 881
 882 void wxThreadModule::OnExit()
 883 {
 884 }
 885
 886 // ----------------------------------------------------------------------------
 887 // under MacOS we don't have currently preemptive threads, so any thread may access
 888 // the GUI at any time
 889 // ----------------------------------------------------------------------------
 890
 891 void WXDLLEXPORT wxMutexGuiEnter()
 892 {
 893 }
 894
 895 void WXDLLEXPORT wxMutexGuiLeave()
 896 {
 897 }
 898
 899 void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
 900 {
 901 }
 902
 903 bool WXDLLEXPORT wxGuiOwnedByMainThread()
 904 {
 905     return false ;
 906 }
 907
 908 // wake up the main thread
 909 void WXDLLEXPORT wxWakeUpMainThread()
 910 {
 911     wxMacWakeUp() ;
 912 }
 913
 914 bool WXDLLEXPORT wxIsWaitingForThread()
 915 {
 916     return false ;
 917 }
 918
 919 #include "wx/thrimpl.cpp"
 920
 921 #endif // wxUSE_THREADS