src/mac/carbon/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 (%d 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 / 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     delete m_internal;
 580 }
 581
 582 // create/start thread
 583 // -------------------
 584
 585 wxThreadError wxThread::Create(unsigned int stackSize)
 586 {
 587     wxCriticalSectionLocker lock(m_critsect);
 588
 589     if ( !m_internal->Create(this, stackSize) )
 590         return wxTHREAD_NO_RESOURCE;
 591
 592     return wxTHREAD_NO_ERROR;
 593 }
 594
 595 wxThreadError wxThread::Run()
 596 {
 597     wxCriticalSectionLocker lock(m_critsect);
 598
 599     if ( m_internal->GetState() != STATE_NEW )
 600     {
 601         // actually, it may be almost any state at all, not only STATE_RUNNING
 602         return wxTHREAD_RUNNING;
 603     }
 604
 605     // the thread has just been created and is still suspended - let it run
 606     return Resume();
 607 }
 608
 609 // suspend/resume thread
 610 // ---------------------
 611
 612 wxThreadError wxThread::Pause()
 613 {
 614     wxCriticalSectionLocker lock(m_critsect);
 615
 616     return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 617 }
 618
 619 wxThreadError wxThread::Resume()
 620 {
 621     wxCriticalSectionLocker lock(m_critsect);
 622
 623     return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 624 }
 625
 626 // stopping thread
 627 // ---------------
 628
 629 wxThread::ExitCode wxThread::Wait()
 630 {
 631     // although under MacOS we can wait for any thread, it's an error to
 632     // wait for a detached one in wxWin API
 633     wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
 634                  _T("can't wait for detached thread") );
 635
 636     ExitCode rc = (ExitCode)-1;
 637
 638     (void)Delete(&rc);
 639
 640     m_internal->Free();
 641
 642     return rc;
 643 }
 644
 645 wxThreadError wxThread::Delete(ExitCode *pRc)
 646 {
 647     ExitCode rc = 0;
 648
 649     // Delete() is always safe to call, so consider all possible states
 650
 651     // has the thread started to run?
 652     bool shouldResume = FALSE;
 653
 654     {
 655         wxCriticalSectionLocker lock(m_critsect);
 656
 657         if ( m_internal->GetState() == STATE_NEW )
 658         {
 659             // WinThreadStart() will see it and terminate immediately
 660             m_internal->SetState(STATE_EXITED);
 661
 662             shouldResume = TRUE;
 663         }
 664     }
 665
 666     // is the thread paused?
 667     if ( shouldResume || IsPaused() )
 668         Resume();
 669
 670     // does is still run?
 671     if ( IsRunning() )
 672     {
 673         if ( IsMain() )
 674         {
 675             // set flag for wxIsWaitingForThread()
 676             gs_waitingForThread = TRUE;
 677
 678 #if wxUSE_GUI
 679             wxBeginBusyCursor();
 680 #endif // wxUSE_GUI
 681         }
 682
 683         // ask the thread to terminate
 684         {
 685             wxCriticalSectionLocker lock(m_critsect);
 686
 687             m_internal->Cancel();
 688         }
 689
 690 #if wxUSE_GUI
 691         // simply wait for the thread to terminate
 692         while( TestDestroy() )
 693         {
 694             ::YieldToAnyThread() ;
 695         }
 696 #else // !wxUSE_GUI
 697         // simply wait for the thread to terminate
 698         while( TestDestroy() )
 699         {
 700             ::YieldToAnyThread() ;
 701         }
 702 #endif // wxUSE_GUI/!wxUSE_GUI
 703
 704         if ( IsMain() )
 705         {
 706             gs_waitingForThread = FALSE;
 707
 708 #if wxUSE_GUI
 709             wxEndBusyCursor();
 710 #endif // wxUSE_GUI
 711         }
 712     }
 713
 714  //   if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
 715     {
 716         wxLogLastError("GetExitCodeThread");
 717
 718         rc = (ExitCode)-1;
 719     }
 720
 721     if ( IsDetached() )
 722     {
 723         // if the thread exits normally, this is done in WinThreadStart, but in
 724         // this case it would have been too early because
 725         // MsgWaitForMultipleObject() would fail if the therad handle was
 726         // closed while we were waiting on it, so we must do it here
 727         delete this;
 728     }
 729
 730  //   wxASSERT_MSG( (DWORD)rc != STILL_ACTIVE,
 731  //                 wxT("thread must be already terminated.") );
 732
 733     if ( pRc )
 734         *pRc = rc;
 735
 736     return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
 737 }
 738
 739 wxThreadError wxThread::Kill()
 740 {
 741     if ( !IsRunning() )
 742         return wxTHREAD_NOT_RUNNING;
 743
 744 //    if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
 745     {
 746         wxLogSysError(_("Couldn't terminate thread"));
 747
 748         return wxTHREAD_MISC_ERROR;
 749     }
 750
 751     m_internal->Free();
 752
 753     if ( IsDetached() )
 754     {
 755         delete this;
 756     }
 757
 758     return wxTHREAD_NO_ERROR;
 759 }
 760
 761 void wxThread::Exit(ExitCode status)
 762 {
 763     m_internal->Free();
 764
 765     if ( IsDetached() )
 766     {
 767         delete this;
 768     }
 769
 770     m_internal->SetResult( status ) ;
 771
 772 /*
 773 #if defined(__VISUALC__) || (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500))
 774     _endthreadex((unsigned)status);
 775 #else // !VC++
 776     ::ExitThread((DWORD)status);
 777 #endif // VC++/!VC++
 778 */
 779     wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
 780 }
 781
 782 // priority setting
 783 // ----------------
 784
 785 // since all these calls are execute cooperatively we don't have to use the critical section
 786
 787 void wxThread::SetPriority(unsigned int prio)
 788 {
 789     m_internal->SetPriority(prio);
 790 }
 791
 792 unsigned int wxThread::GetPriority() const
 793 {
 794     return m_internal->GetPriority();
 795 }
 796
 797 unsigned long wxThread::GetId() const
 798 {
 799     return (unsigned long)m_internal->GetId();
 800 }
 801
 802 bool wxThread::IsRunning() const
 803 {
 804     return m_internal->GetState() == STATE_RUNNING;
 805 }
 806
 807 bool wxThread::IsAlive() const
 808 {
 809     return (m_internal->GetState() == STATE_RUNNING) ||
 810            (m_internal->GetState() == STATE_PAUSED);
 811 }
 812
 813 bool wxThread::IsPaused() const
 814 {
 815     return m_internal->GetState() == STATE_PAUSED;
 816 }
 817
 818 bool wxThread::TestDestroy()
 819 {
 820     return m_internal->GetState() == STATE_CANCELED;
 821 }
 822
 823 // ----------------------------------------------------------------------------
 824 // Automatic initialization for thread module
 825 // ----------------------------------------------------------------------------
 826
 827 class wxThreadModule : public wxModule
 828 {
 829 public:
 830     virtual bool OnInit();
 831     virtual void OnExit();
 832
 833 private:
 834     DECLARE_DYNAMIC_CLASS(wxThreadModule)
 835 };
 836
 837 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 838
 839 bool wxThreadModule::OnInit()
 840 {
 841     long response;
 842     bool hasThreadManager ;
 843     hasThreadManager = Gestalt( gestaltThreadMgrAttr, &response) == noErr && response & 1;
 844 #if !TARGET_CARBON
 845 #if GENERATINGCFM
 846     // verify presence of shared library
 847     hasThreadManager = hasThreadManager && ((Ptr)NewThread != (Ptr)kUnresolvedCFragSymbolAddress);
 848 #endif
 849 #endif
 850     if ( !hasThreadManager )
 851     {
 852         wxMessageBox( "Error" , "Thread Support is not available on this System" , wxOK ) ;
 853         return FALSE ;
 854     }
 855
 856     // no error return for GetCurrentThreadId()
 857     MacGetCurrentThread( &gs_idMainThread ) ;
 858
 859     return TRUE;
 860 }
 861
 862 void wxThreadModule::OnExit()
 863 {
 864 }
 865
 866 // ----------------------------------------------------------------------------
 867 // under MacOS we don't have currently preemptive threads, so any thread may access
 868 // the GUI at any time
 869 // ----------------------------------------------------------------------------
 870
 871 void WXDLLEXPORT wxMutexGuiEnter()
 872 {
 873 }
 874
 875 void WXDLLEXPORT wxMutexGuiLeave()
 876 {
 877 }
 878
 879 void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
 880 {
 881 }
 882
 883 bool WXDLLEXPORT wxGuiOwnedByMainThread()
 884 {
 885     return false ;
 886 }
 887
 888 // wake up the main thread
 889 void WXDLLEXPORT wxWakeUpMainThread()
 890 {
 891     wxMacWakeUp() ;
 892 }
 893
 894 bool WXDLLEXPORT wxIsWaitingForThread()
 895 {
 896     return false ;
 897 }
 898
 899 #include "wx/thrimpl.cpp"
 900
 901 #endif // wxUSE_THREADS
 902
 903 // vi:sts=4:sw=4:et