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Some little additions to how wxBufferedDC is wrapped.
[wxWidgets.git] / src / mac / thread.cpp
diff --git a/src/mac/thread.cpp b/src/mac/thread.cpp
index 3dca96a6fa6e85f6f13dfc32fac184cf58e0a033..88f837d669ea70fc2a57655955941fac9e6b2095 100644 (file)
--- a/src/mac/thread.cpp
+++ b/src/mac/thread.cpp
@@ -1,12 +1,12 @@
 /////////////////////////////////////////////////////////////////////////////
 // Name:        thread.cpp
 // Purpose:     wxThread Implementation
 /////////////////////////////////////////////////////////////////////////////
 // Name:        thread.cpp
 // Purpose:     wxThread Implementation
-// Author:      Original from Wolfram Gloger/Guilhem Lavaux
-// Modified by: Vadim Zeitlin to make it work :-)
+// Author:      Original from Wolfram Gloger/Guilhem Lavaux/Vadim Zeitlin
+// Modified by: Stefan Csomor
 // Created:     04/22/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998),
 // Created:     04/22/98
 // RCS-ID:      $Id$
 // Copyright:   (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998),
-//                  Vadim Zeitlin (1999)
+//                  Vadim Zeitlin (1999) , Stefan Csomor (2000)
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
@@ -31,13 +31,18 @@
 
 #if wxUSE_THREADS
 
 
 #if wxUSE_THREADS
 
-#include <stdio.h>
-
-#include <windows.h>
-
 #include "wx/module.h"
 #include "wx/thread.h"
 
 #include "wx/module.h"
 #include "wx/thread.h"
 
+#ifdef __WXMAC__
+#include <Threads.h>
+#include "wx/mac/uma.h"
+#endif
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
 // the possible states of the thread ("=>" shows all possible transitions from
 // this state)
 enum wxThreadState
 // the possible states of the thread ("=>" shows all possible transitions from
 // this state)
 enum wxThreadState
@@ -50,112 +55,146 @@ enum wxThreadState
 };
 
 // ----------------------------------------------------------------------------
 };
 
 // ----------------------------------------------------------------------------
-// static variables
+// this module globals
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 
-// if it's FALSE, some secondary thread is holding the GUI lock
-static bool s_bGuiOwnedByMainThread = TRUE;
-
-// critical section which controls access to all GUI functions: any secondary
-// thread (i.e. except the main one) must enter this crit section before doing
-// any GUI calls
-static wxCriticalSection *s_critsectGui = NULL;
-
-// critical section which protects s_nWaitingForGui variable
-static wxCriticalSection *s_critsectWaitingForGui = NULL;
-
-// number of threads waiting for GUI in wxMutexGuiEnter()
-static size_t s_nWaitingForGui = 0;
-
-// are we waiting for a thread termination?
-static bool s_waitingForThread = FALSE;
+static ThreadID gs_idMainThread = kNoThreadID ;
+static bool gs_waitingForThread = FALSE ;
 
 // ============================================================================
 
 // ============================================================================
-// Windows implementation of thread classes
+// MacOS implementation of thread classes
 // ============================================================================
 
 // ============================================================================
 
+class wxMacStCritical
+{
+public :
+    wxMacStCritical()
+    {
+        if ( UMASystemIsInitialized() )
+            ThreadBeginCritical() ;
+    }
+    ~wxMacStCritical()
+    {
+        if ( UMASystemIsInitialized() )
+            ThreadEndCritical() ;
+    }
+};
+
 // ----------------------------------------------------------------------------
 // wxMutex implementation
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // wxMutex implementation
 // ----------------------------------------------------------------------------
+
 class wxMutexInternal
 {
 public:
 class wxMutexInternal
 {
 public:
-   Handle p_mutex;
+    wxMutexInternal()
+    {
+        m_owner = kNoThreadID ;
+    }
+
+    ~wxMutexInternal()
+    {
+    }
+
+public:
+    ThreadID m_owner ;
+    wxArrayLong m_waiters ;
 };
 
 wxMutex::wxMutex()
 {
 };
 
 wxMutex::wxMutex()
 {
-    p_internal = new wxMutexInternal;
-//    p_internal->p_mutex = CreateMutex(NULL, FALSE, NULL);
-    if ( !p_internal->p_mutex )
-    {
-        wxLogSysError(_("Can not create mutex."));
-    }
+    m_internal = new wxMutexInternal;
 
     m_locked = 0;
 }
 
 wxMutex::~wxMutex()
 {
 
     m_locked = 0;
 }
 
 wxMutex::~wxMutex()
 {
-    if (m_locked > 0)
-        wxLogDebug(wxT("Warning: freeing a locked mutex (%d locks)."), m_locked);
-//    CloseHandle(p_internal->p_mutex);
+    if ( m_locked > 0 )
+    {
+        wxLogDebug(_T("Warning: freeing a locked mutex (%d locks)."), m_locked);
+    }
+
+    delete m_internal;
 }
 
 wxMutexError wxMutex::Lock()
 {
 }
 
 wxMutexError wxMutex::Lock()
 {
-/*
-    DWORD ret;
-
-    ret = WaitForSingleObject(p_internal->p_mutex, INFINITE);
-    switch ( ret )
+    wxMacStCritical critical ;
+    if ( UMASystemIsInitialized() )
     {
     {
-        case WAIT_ABANDONED:
-            return wxMUTEX_BUSY;
-
-        case WAIT_OBJECT_0:
-            // ok
-            break;
-
-        case WAIT_FAILED:
-            wxLogSysError(_("Couldn't acquire a mutex lock"));
-            return wxMUTEX_MISC_ERROR;
-
-        case WAIT_TIMEOUT:
-        default:
-            wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
+        OSErr err ;
+        ThreadID current = kNoThreadID;
+        err = ::MacGetCurrentThread(&current);
+        // if we are not the owner, add this thread to the list of waiting threads, stop this thread
+        // and invoke the scheduler to continue executing the owner's thread
+        while ( m_internal->m_owner != kNoThreadID && m_internal->m_owner != current)
+        {
+            m_internal->m_waiters.Add(current);
+            err = ::SetThreadStateEndCritical(kCurrentThreadID, kStoppedThreadState, m_internal->m_owner);
+            err = ::ThreadBeginCritical();
+        }
+        m_internal->m_owner = current;
     }
     }
-*/
     m_locked++;
     m_locked++;
+
     return wxMUTEX_NO_ERROR;
 }
 
 wxMutexError wxMutex::TryLock()
 {
     return wxMUTEX_NO_ERROR;
 }
 
 wxMutexError wxMutex::TryLock()
 {
-/*
-    DWORD ret;
-
-    ret = WaitForSingleObject(p_internal->p_mutex, 0);
-    if (ret == WAIT_TIMEOUT || ret == WAIT_ABANDONED)
-        return wxMUTEX_BUSY;
+    wxMacStCritical critical ;
+    if ( UMASystemIsInitialized() )
+    {
+        OSErr err ;
+        ThreadID current = kNoThreadID;
+        ::MacGetCurrentThread(&current);
+        // if we are not the owner, give an error back
+        if ( m_internal->m_owner != kNoThreadID && m_internal->m_owner != current )
+            return wxMUTEX_BUSY;
 
 
+        m_internal->m_owner = current;
+    }
     m_locked++;
     m_locked++;
-*/
-    return wxMUTEX_NO_ERROR;
+
+   return wxMUTEX_NO_ERROR;
 }
 
 wxMutexError wxMutex::Unlock()
 {
 }
 
 wxMutexError wxMutex::Unlock()
 {
-    if (m_locked > 0)
-        m_locked--;
-/*
-    BOOL ret = ReleaseMutex(p_internal->p_mutex);
-    if ( ret == 0 )
+    if ( UMASystemIsInitialized() )
     {
     {
-        wxLogSysError(_("Couldn't release a mutex"));
-        return wxMUTEX_MISC_ERROR;
+        OSErr err;
+        err = ::ThreadBeginCritical();
+
+        if (m_locked > 0)
+            m_locked--;
+
+        // this mutex is not owned by anybody anmore
+        m_internal->m_owner = kNoThreadID;
+
+        // now pass on to the first waiting thread
+        ThreadID firstWaiting = kNoThreadID;
+        bool found = false;
+        while (!m_internal->m_waiters.IsEmpty() && !found)
+        {
+            firstWaiting = m_internal->m_waiters[0];
+            err = ::SetThreadState(firstWaiting, kReadyThreadState, kNoThreadID);
+            // in case this was not successful (dead thread), we just loop on and reset the id
+            found = (err != threadNotFoundErr);
+            if ( !found )
+                firstWaiting = kNoThreadID ;
+            m_internal->m_waiters.RemoveAt(0) ;
+        }
+        // now we have a valid firstWaiting thread, which has been scheduled to run next, just end the
+        // critical section and invoke the scheduler
+        err = ::SetThreadStateEndCritical(kCurrentThreadID, kReadyThreadState, firstWaiting);
+    }
+    else
+    {
+        if (m_locked > 0)
+            m_locked--;
     }
     }
-*/
     return wxMUTEX_NO_ERROR;
 }
 
     return wxMUTEX_NO_ERROR;
 }
 
@@ -166,66 +205,89 @@ wxMutexError wxMutex::Unlock()
 class wxConditionInternal
 {
 public:
 class wxConditionInternal
 {
 public:
-    Handle event;
-    int waiters;
-};
+    wxConditionInternal(wxMutex& mutex) : m_mutex(mutex)
+    {
+        m_excessSignals = 0 ;
+    }
+    ~wxConditionInternal()
+    {
+    }
 
 
-wxCondition::wxCondition()
-{
-    p_internal = new wxConditionInternal;
-//    p_internal->event = CreateEvent(NULL, FALSE, FALSE, NULL);
-    if ( !p_internal->event )
+    bool Wait(unsigned long msectimeout)
     {
     {
-        wxLogSysError(_("Can not create event object."));
+        wxMacStCritical critical ;
+        if ( m_excessSignals > 0 )
+        {
+            --m_excessSignals ;
+            return TRUE ;
+        }
+        else if ( msectimeout == 0 )
+        {
+            return FALSE ;
+        }
+        else
+        {
+        }
+        /*
+        waiters++;
+
+        // FIXME this should be MsgWaitForMultipleObjects() as well probably
+        DWORD rc = ::WaitForSingleObject(event, timeout);
+
+        waiters--;
+
+        return rc != WAIT_TIMEOUT;
+        */
+        return TRUE ;
     }
     }
+    void Signal()
+    {
+        wxMacStCritical critical ;
+    }
+
+    wxArrayLong m_waiters ;
+    wxInt32     m_excessSignals ;
+    wxMutex&    m_mutex;
+};
 
 
-    p_internal->waiters = 0;
+wxCondition::wxCondition(wxMutex& mutex)
+{
+    m_internal = new wxConditionInternal(mutex);
 }
 
 wxCondition::~wxCondition()
 {
 }
 
 wxCondition::~wxCondition()
 {
-//    CloseHandle(p_internal->event);
+    delete m_internal;
 }
 
 }
 
-void wxCondition::Wait(wxMutex& mutex)
+void wxCondition::Wait()
 {
 {
-    mutex.Unlock();
-    p_internal->waiters++;
-//    WaitForSingleObject(p_internal->event, INFINITE);
-    p_internal->waiters--;
-    mutex.Lock();
+    (void)m_internal->Wait(0xFFFFFFFFL);
 }
 
 }
 
-bool wxCondition::Wait(wxMutex& mutex,
-                       unsigned long sec,
-                       unsigned long nsec)
+bool wxCondition::Wait(unsigned long timeout_millis)
 {
 {
-//    DWORD ret;
-
-    mutex.Unlock();
-    p_internal->waiters++;
- //   ret = WaitForSingleObject(p_internal->event, (sec*1000)+(nsec/1000000));
-    p_internal->waiters--;
-    mutex.Lock();
-
-    return TRUE; // false for timeout
+    return m_internal->Wait(timeout_millis);
 }
 
 void wxCondition::Signal()
 {
 }
 
 void wxCondition::Signal()
 {
-//    SetEvent(p_internal->event);
+    // set the event to signaled: if a thread is already waiting on it, it will
+    // be woken up, otherwise the event will remain in the signaled state until
+    // someone waits on it. In any case, the system will return it to a non
+    // signalled state afterwards. If multiple threads are waiting, only one
+    // will be woken up.
+    m_internal->Signal() ;
 }
 
 void wxCondition::Broadcast()
 {
 }
 
 void wxCondition::Broadcast()
 {
-    int i;
-
-    for (i=0;i<p_internal->waiters;i++)
+    // this works because all these threads are already waiting and so each
+    // SetEvent() inside Signal() is really a PulseEvent() because the event
+    // state is immediately returned to non-signaled
+    for ( int i = 0; i < m_internal->m_waiters.Count(); i++ )
     {
     {
-//        if ( SetEvent(p_internal->event) == 0 )
-        {
-            wxLogSysError(_("Couldn't change the state of event object."));
-        }
+        Signal();
     }
 }
 
     }
 }
 
@@ -233,43 +295,7 @@ void wxCondition::Broadcast()
 // wxCriticalSection implementation
 // ----------------------------------------------------------------------------
 
 // wxCriticalSection implementation
 // ----------------------------------------------------------------------------
 
-class wxCriticalSectionInternal
-{
-public:
-    // init the critical section object
-    wxCriticalSectionInternal()
-        { /* ::InitializeCriticalSection(&m_data);*/ }
-
-    // implicit cast to the associated data
-    operator Handle *() { return &m_data; }
-
-    // free the associated ressources
-    ~wxCriticalSectionInternal()
-        { /* ::DeleteCriticalSection(&m_data); */}
-
-private:
-    Handle m_data;
-};
-
-wxCriticalSection::wxCriticalSection()
-{
-    m_critsect = new wxCriticalSectionInternal;
-}
-
-wxCriticalSection::~wxCriticalSection()
-{
-    delete m_critsect;
-}
-
-void wxCriticalSection::Enter()
-{
-//    ::EnterCriticalSection(*m_critsect);
-}
-
-void wxCriticalSection::Leave()
-{
-//    ::LeaveCriticalSection(*m_critsect);
-}
+// it's implemented as a mutex on mac os, so it is defined in the headers
 
 // ----------------------------------------------------------------------------
 // wxThread implementation
 
 // ----------------------------------------------------------------------------
 // wxThread implementation
@@ -278,19 +304,26 @@ void wxCriticalSection::Leave()
 // wxThreadInternal class
 // ----------------------
 
 // wxThreadInternal class
 // ----------------------
 
-/*
 class wxThreadInternal
 {
 public:
     wxThreadInternal()
     {
 class wxThreadInternal
 {
 public:
     wxThreadInternal()
     {
-        m_hThread = 0;
+        m_tid = kNoThreadID ;
         m_state = STATE_NEW;
         m_priority = WXTHREAD_DEFAULT_PRIORITY;
     }
 
         m_state = STATE_NEW;
         m_priority = WXTHREAD_DEFAULT_PRIORITY;
     }
 
+    ~wxThreadInternal()
+    {
+    }
+
+    void Free()
+    {
+    }
+
     // create a new (suspended) thread (for the given thread object)
     // create a new (suspended) thread (for the given thread object)
-    bool Create(wxThread *thread);
+    bool Create(wxThread *thread, unsigned int stackSize);
 
     // suspend/resume/terminate
     bool Suspend();
 
     // suspend/resume/terminate
     bool Suspend();
@@ -302,83 +335,86 @@ public:
     wxThreadState GetState() const { return m_state; }
 
     // thread priority
     wxThreadState GetState() const { return m_state; }
 
     // thread priority
-    void SetPriority(unsigned int priority) { m_priority = priority; }
+    void SetPriority(unsigned int priority);
     unsigned int GetPriority() const { return m_priority; }
 
     unsigned int GetPriority() const { return m_priority; }
 
+    void SetResult( void *res ) { m_result = res ; }
+    void *GetResult() { return m_result ; }
+
     // thread handle and id
     // thread handle and id
-    HANDLE GetHandle() const { return m_hThread; }
-    DWORD  GetId() const { return m_tid; }
+    ThreadID  GetId() const { return m_tid; }
 
     // thread function
 
     // thread function
-    static DWORD WinThreadStart(wxThread *thread);
+    static pascal void*    MacThreadStart(wxThread* arg);
 
 private:
 
 private:
-    Handle        m_hThread;    // handle of the thread
-    wxThreadState m_state;      // state, see wxThreadState enum
-    unsigned int  m_priority;   // thread priority in "wx" units
-    ThreadId         m_tid;        // thread id
+    wxThreadState           m_state;      // state, see wxThreadState enum
+    unsigned int            m_priority;   // thread priority in "wx" units
+    ThreadID                m_tid;        // thread id
+    void*                   m_result;
+    static ThreadEntryUPP   s_threadEntry ;
 };
 
 };
 
-DWORD wxThreadInternal::WinThreadStart(wxThread *thread)
+static wxArrayPtrVoid s_threads ;
+
+ThreadEntryUPP wxThreadInternal::s_threadEntry = NULL ;
+pascal void* wxThreadInternal::MacThreadStart(wxThread *thread)
 {
 {
-    // store the thread object in the TLS
-    if ( !::TlsSetValue(s_tlsThisThread, thread) )
+    // first of all, check whether we hadn't been cancelled already
+    if ( thread->m_internal->GetState() == STATE_EXITED )
     {
     {
-        wxLogSysError(_("Can not start thread: error writing TLS."));
-
-        return (DWORD)-1;
+        return (void*)-1;
     }
 
     }
 
-    DWORD ret = (DWORD)thread->Entry();
-    thread->p_internal->SetState(STATE_EXITED);
+    void* rc = thread->Entry();
+
+    // enter m_critsect before changing the thread state
+    thread->m_critsect.Enter();
+    bool wasCancelled = thread->m_internal->GetState() == STATE_CANCELED;
+    thread->m_internal->SetState(STATE_EXITED);
+    thread->m_critsect.Leave();
+
     thread->OnExit();
 
     thread->OnExit();
 
-    delete thread;
+    // if the thread was cancelled (from Delete()), then it the handle is still
+    // needed there
+    if ( thread->IsDetached() && !wasCancelled )
+    {
+        // auto delete
+        delete thread;
+    }
+    //else: the joinable threads handle will be closed when Wait() is done
 
 
-    return ret;
+    return rc;
 }
 }
-
-bool wxThreadInternal::Create(wxThread *thread)
+void wxThreadInternal::SetPriority(unsigned int priority)
 {
 {
-    m_hThread = ::CreateThread
-                  (
-                    NULL,                               // default security
-                    0,                                  // default stack size
-                    (LPTHREAD_START_ROUTINE)            // thread entry point
-                    wxThreadInternal::WinThreadStart,   //
-                    (LPVOID)thread,                     // parameter
-                    CREATE_SUSPENDED,                   // flags
-                    &m_tid                              // [out] thread id
-                  );
+    // Priorities don't exist on Mac
+}
 
 
-    if ( m_hThread == NULL )
+bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize)
+{
+    if ( s_threadEntry == NULL )
     {
     {
-        wxLogSysError(_("Can't create thread"));
-
-        return FALSE;
+        s_threadEntry = NewThreadEntryUPP( (ThreadEntryProcPtr) MacThreadStart ) ;
     }
     }
-
-    // translate wxWindows priority to the Windows one
-    int win_priority;
-    if (m_priority <= 20)
-        win_priority = THREAD_PRIORITY_LOWEST;
-    else if (m_priority <= 40)
-        win_priority = THREAD_PRIORITY_BELOW_NORMAL;
-    else if (m_priority <= 60)
-        win_priority = THREAD_PRIORITY_NORMAL;
-    else if (m_priority <= 80)
-        win_priority = THREAD_PRIORITY_ABOVE_NORMAL;
-    else if (m_priority <= 100)
-        win_priority = THREAD_PRIORITY_HIGHEST;
-    else
+    OSErr err = NewThread( kCooperativeThread,
+                           s_threadEntry,
+                           (void*) thread,
+                           stackSize,
+                           kNewSuspend,
+                           &m_result,
+                           &m_tid );
+
+    if ( err != noErr )
     {
     {
-        wxFAIL_MSG(wxT("invalid value of thread priority parameter"));
-        win_priority = THREAD_PRIORITY_NORMAL;
+        wxLogSysError(_("Can't create thread"));
+        return FALSE;
     }
 
     }
 
-    if ( ::SetThreadPriority(m_hThread, win_priority) == 0 )
+    if ( m_priority != WXTHREAD_DEFAULT_PRIORITY )
     {
     {
-        wxLogSysError(_("Can't set thread priority"));
+        SetPriority(m_priority);
     }
 
     return TRUE;
     }
 
     return TRUE;
@@ -386,78 +422,155 @@ bool wxThreadInternal::Create(wxThread *thread)
 
 bool wxThreadInternal::Suspend()
 {
 
 bool wxThreadInternal::Suspend()
 {
-    DWORD nSuspendCount = ::SuspendThread(m_hThread);
-    if ( nSuspendCount == (DWORD)-1 )
-    {
-        wxLogSysError(_("Can not suspend thread %x"), m_hThread);
+    OSErr err ;
 
 
+    ::ThreadBeginCritical();
+
+    if ( m_state != STATE_RUNNING )
+    {
+        ::ThreadEndCritical() ;
+        wxLogSysError(_("Can not suspend thread %x"), m_tid);
         return FALSE;
     }
 
     m_state = STATE_PAUSED;
 
         return FALSE;
     }
 
     m_state = STATE_PAUSED;
 
+    err = ::SetThreadStateEndCritical(m_tid, kStoppedThreadState, kNoThreadID);
+
     return TRUE;
 }
 
 bool wxThreadInternal::Resume()
 {
     return TRUE;
 }
 
 bool wxThreadInternal::Resume()
 {
-    DWORD nSuspendCount = ::ResumeThread(m_hThread);
-    if ( nSuspendCount == (DWORD)-1 )
-    {
-        wxLogSysError(_("Can not resume thread %x"), m_hThread);
+    ThreadID current ;
+    OSErr err ;
+    err = MacGetCurrentThread( &current ) ;
 
 
+    wxASSERT( err == noErr ) ;
+    wxASSERT( current != m_tid ) ;
+
+    ::ThreadBeginCritical();
+    if ( m_state != STATE_PAUSED && m_state != STATE_NEW )
+    {
+        ::ThreadEndCritical() ;
+        wxLogSysError(_("Can not resume thread %x"), m_tid);
         return FALSE;
         return FALSE;
+
     }
     }
+    err = ::SetThreadStateEndCritical(m_tid, kReadyThreadState, kNoThreadID);
+    wxASSERT( err == noErr ) ;
 
     m_state = STATE_RUNNING;
 
     m_state = STATE_RUNNING;
-
+    ::ThreadEndCritical() ;
+    ::YieldToAnyThread() ;
     return TRUE;
 }
 
 // static functions
 // ----------------
     return TRUE;
 }
 
 // static functions
 // ----------------
-
 wxThread *wxThread::This()
 {
 wxThread *wxThread::This()
 {
-    wxThread *thread = (wxThread *)::TlsGetValue(s_tlsThisThread);
+    wxMacStCritical critical ;
 
 
-    // be careful, 0 may be a valid return value as well
-    if ( !thread && (::GetLastError() != NO_ERROR) )
-    {
-        wxLogSysError(_("Couldn't get the current thread pointer"));
+    ThreadID current ;
+    OSErr err ;
 
 
-        // return NULL...
+    err = MacGetCurrentThread( &current ) ;
+
+    for ( int i = 0 ; i < s_threads.Count() ; ++i )
+    {
+        if ( ( (wxThread*) s_threads[i] )->GetId() == current )
+            return (wxThread*) s_threads[i] ;
     }
 
     }
 
-    return thread;
+    wxLogSysError(_("Couldn't get the current thread pointer"));
+    return NULL;
 }
 
 bool wxThread::IsMain()
 {
 }
 
 bool wxThread::IsMain()
 {
-    return ::GetCurrentThreadId() == s_idMainThread;
+    ThreadID current ;
+    OSErr err ;
+
+    err = MacGetCurrentThread( &current ) ;
+    return current == gs_idMainThread;
 }
 
 #ifdef Yield
 }
 
 #ifdef Yield
-    #undef Yield
+#undef Yield
 #endif
 
 void wxThread::Yield()
 {
 #endif
 
 void wxThread::Yield()
 {
-    // 0 argument to Sleep() is special
-    ::Sleep(0);
+    ::YieldToAnyThread() ;
 }
 
 void wxThread::Sleep(unsigned long milliseconds)
 {
 }
 
 void wxThread::Sleep(unsigned long milliseconds)
 {
-    ::Sleep(milliseconds);
+        clock_t start = clock() ;
+        do
+        {
+            YieldToAnyThread() ;
+        } while( clock() - start < milliseconds / CLOCKS_PER_SEC ) ;
+}
+
+int wxThread::GetCPUCount()
+{
+    // we will use whatever MP API will be used for the new MP Macs
+    return 1;
+}
+
+unsigned long wxThread::GetCurrentId()
+{
+    ThreadID current ;
+    MacGetCurrentThread( &current ) ;
+    return (unsigned long)current;
+}
+
+bool wxThread::SetConcurrency(size_t level)
+{
+    wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
+
+    // ok only for the default one
+    if ( level == 0 )
+        return 0;
+
+    // how many CPUs have we got?
+    if ( GetCPUCount() == 1 )
+    {
+        // don't bother with all this complicated stuff - on a single
+        // processor system it doesn't make much sense anyhow
+        return level == 1;
+    }
+
+    return TRUE ;
+}
+
+// ctor and dtor
+// -------------
+
+wxThread::wxThread(wxThreadKind kind)
+{
+    m_internal = new wxThreadInternal();
+
+    m_isDetached = kind == wxTHREAD_DETACHED;
+    s_threads.Add( (void*) this ) ;
+}
+
+wxThread::~wxThread()
+{
+    s_threads.Remove( (void*) this ) ;
+    delete m_internal;
 }
 
 // create/start thread
 // -------------------
 
 }
 
 // create/start thread
 // -------------------
 
-wxThreadError wxThread::Create()
+wxThreadError wxThread::Create(unsigned int stackSize)
 {
 {
-    if ( !p_internal->Create(this) )
+    wxCriticalSectionLocker lock(m_critsect);
+
+    if ( !m_internal->Create(this, stackSize) )
         return wxTHREAD_NO_RESOURCE;
 
     return wxTHREAD_NO_ERROR;
         return wxTHREAD_NO_RESOURCE;
 
     return wxTHREAD_NO_ERROR;
@@ -467,12 +580,13 @@ wxThreadError wxThread::Run()
 {
     wxCriticalSectionLocker lock(m_critsect);
 
 {
     wxCriticalSectionLocker lock(m_critsect);
 
-    if ( p_internal->GetState() != STATE_NEW )
+    if ( m_internal->GetState() != STATE_NEW )
     {
         // actually, it may be almost any state at all, not only STATE_RUNNING
         return wxTHREAD_RUNNING;
     }
 
     {
         // actually, it may be almost any state at all, not only STATE_RUNNING
         return wxTHREAD_RUNNING;
     }
 
+    // the thread has just been created and is still suspended - let it run
     return Resume();
 }
 
     return Resume();
 }
 
@@ -483,120 +597,127 @@ wxThreadError wxThread::Pause()
 {
     wxCriticalSectionLocker lock(m_critsect);
 
 {
     wxCriticalSectionLocker lock(m_critsect);
 
-    return p_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
+    return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 }
 
 wxThreadError wxThread::Resume()
 {
     wxCriticalSectionLocker lock(m_critsect);
 
 }
 
 wxThreadError wxThread::Resume()
 {
     wxCriticalSectionLocker lock(m_critsect);
 
-    return p_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
+    return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 }
 
 // stopping thread
 // ---------------
 
 }
 
 // stopping thread
 // ---------------
 
-wxThread::ExitCode wxThread::Delete()
+wxThread::ExitCode wxThread::Wait()
+{
+    // although under MacOS we can wait for any thread, it's an error to
+    // wait for a detached one in wxWin API
+    wxCHECK_MSG( !IsDetached(), (ExitCode)-1,
+                 _T("can't wait for detached thread") );
+
+    ExitCode rc = (ExitCode)-1;
+
+    (void)Delete(&rc);
+
+    m_internal->Free();
+
+    return rc;
+}
+
+wxThreadError wxThread::Delete(ExitCode *pRc)
 {
     ExitCode rc = 0;
 
     // Delete() is always safe to call, so consider all possible states
 {
     ExitCode rc = 0;
 
     // Delete() is always safe to call, so consider all possible states
-    if ( IsPaused() )
+
+    // has the thread started to run?
+    bool shouldResume = FALSE;
+
+    {
+        wxCriticalSectionLocker lock(m_critsect);
+
+        if ( m_internal->GetState() == STATE_NEW )
+        {
+            // WinThreadStart() will see it and terminate immediately
+            m_internal->SetState(STATE_EXITED);
+
+            shouldResume = TRUE;
+        }
+    }
+
+    // is the thread paused?
+    if ( shouldResume || IsPaused() )
         Resume();
 
         Resume();
 
+    // does is still run?
     if ( IsRunning() )
     {
         if ( IsMain() )
         {
             // set flag for wxIsWaitingForThread()
     if ( IsRunning() )
     {
         if ( IsMain() )
         {
             // set flag for wxIsWaitingForThread()
-            s_waitingForThread = TRUE;
+            gs_waitingForThread = TRUE;
 
 
+#if wxUSE_GUI
             wxBeginBusyCursor();
             wxBeginBusyCursor();
+#endif // wxUSE_GUI
         }
 
         }
 
-        HANDLE hThread;
+        // ask the thread to terminate
         {
             wxCriticalSectionLocker lock(m_critsect);
 
         {
             wxCriticalSectionLocker lock(m_critsect);
 
-            p_internal->Cancel();
-            hThread = p_internal->GetHandle();
+            m_internal->Cancel();
         }
 
         }
 
-        // we can't just wait for the thread to terminate because it might be
-        // calling some GUI functions and so it will never terminate before we
-        // process the Windows messages that result from these functions
-        DWORD result;
-        do
+#if wxUSE_GUI
+        // simply wait for the thread to terminate
+        while( TestDestroy() )
         {
         {
-            result = ::MsgWaitForMultipleObjects
-                     (
-                       1,              // number of objects to wait for
-                       &hThread,       // the objects
-                       FALSE,          // don't wait for all objects
-                       INFINITE,       // no timeout
-                       QS_ALLEVENTS    // return as soon as there are any events
-                     );
-
-            switch ( result )
-            {
-                case 0xFFFFFFFF:
-                    // error
-                    wxLogSysError(_("Can not wait for thread termination"));
-                    Kill();
-                    return (ExitCode)-1;
-
-                case WAIT_OBJECT_0:
-                    // thread we're waiting for terminated
-                    break;
-
-                case WAIT_OBJECT_0 + 1:
-                    // new message arrived, process it
-                    if ( !wxTheApp->DoMessage() )
-                    {
-                        // WM_QUIT received: kill the thread
-                        Kill();
-
-                        return (ExitCode)-1;
-                    }
-
-                    if ( IsMain() )
-                    {
-                        // give the thread we're waiting for chance to exit
-                        // from the GUI call it might have been in
-                        if ( (s_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
-                        {
-                            wxMutexGuiLeave();
-                        }
-                    }
-
-                    break;
-
-                default:
-                    wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));
-            }
-        } while ( result != WAIT_OBJECT_0 );
+            ::YieldToAnyThread() ;
+        }
+#else // !wxUSE_GUI
+        // simply wait for the thread to terminate
+        while( TestDestroy() )
+        {
+            ::YieldToAnyThread() ;
+        }
+#endif // wxUSE_GUI/!wxUSE_GUI
 
         if ( IsMain() )
         {
 
         if ( IsMain() )
         {
-            s_waitingForThread = FALSE;
+            gs_waitingForThread = FALSE;
 
 
+#if wxUSE_GUI
             wxEndBusyCursor();
             wxEndBusyCursor();
+#endif // wxUSE_GUI
         }
         }
+    }
 
 
-        if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
-        {
-            wxLogLastError("GetExitCodeThread");
-
-            rc = (ExitCode)-1;
-        }
+ //   if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
+    {
+        wxLogLastError("GetExitCodeThread");
 
 
-        wxASSERT_MSG( (LPVOID)rc != (LPVOID)STILL_ACTIVE,
-                      wxT("thread must be already terminated.") );
+        rc = (ExitCode)-1;
+    }
 
 
-        ::CloseHandle(hThread);
+    if ( IsDetached() )
+    {
+        // if the thread exits normally, this is done in WinThreadStart, but in
+        // this case it would have been too early because
+        // MsgWaitForMultipleObject() would fail if the therad handle was
+        // closed while we were waiting on it, so we must do it here
+        delete this;
     }
 
     }
 
-    return rc;
+ //   wxASSERT_MSG( (DWORD)rc != STILL_ACTIVE,
+ //                 wxT("thread must be already terminated.") );
+
+    if ( pRc )
+        *pRc = rc;
+
+    return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
 }
 
 wxThreadError wxThread::Kill()
 }
 
 wxThreadError wxThread::Kill()
@@ -604,85 +725,83 @@ wxThreadError wxThread::Kill()
     if ( !IsRunning() )
         return wxTHREAD_NOT_RUNNING;
 
     if ( !IsRunning() )
         return wxTHREAD_NOT_RUNNING;
 
-    if ( !::TerminateThread(p_internal->GetHandle(), (DWORD)-1) )
+//    if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
     {
         wxLogSysError(_("Couldn't terminate thread"));
 
         return wxTHREAD_MISC_ERROR;
     }
 
     {
         wxLogSysError(_("Couldn't terminate thread"));
 
         return wxTHREAD_MISC_ERROR;
     }
 
-    delete this;
+    m_internal->Free();
+
+    if ( IsDetached() )
+    {
+        delete this;
+    }
 
     return wxTHREAD_NO_ERROR;
 }
 
 
     return wxTHREAD_NO_ERROR;
 }
 
-void wxThread::Exit(void *status)
+void wxThread::Exit(ExitCode status)
 {
 {
-    delete this;
+    m_internal->Free();
 
 
-    ::ExitThread((DWORD)status);
+    if ( IsDetached() )
+    {
+        delete this;
+    }
+
+    m_internal->SetResult( status ) ;
 
 
+/*
+#if defined(__VISUALC__) || (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500))
+    _endthreadex((unsigned)status);
+#else // !VC++
+    ::ExitThread((DWORD)status);
+#endif // VC++/!VC++
+*/
     wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
 }
 
     wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
 }
 
+// priority setting
+// ----------------
+
+// since all these calls are execute cooperatively we don't have to use the critical section
+
 void wxThread::SetPriority(unsigned int prio)
 {
 void wxThread::SetPriority(unsigned int prio)
 {
-    wxCriticalSectionLocker lock(m_critsect);
-
-    p_internal->SetPriority(prio);
+    m_internal->SetPriority(prio);
 }
 
 unsigned int wxThread::GetPriority() const
 {
 }
 
 unsigned int wxThread::GetPriority() const
 {
-    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
-
-    return p_internal->GetPriority();
+    return m_internal->GetPriority();
 }
 
 }
 
-unsigned long wxThread::GetID() const
+unsigned long wxThread::GetId() const
 {
 {
-    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
-
-    return (unsigned long)p_internal->GetId();
+    return (unsigned long)m_internal->GetId();
 }
 
 bool wxThread::IsRunning() const
 {
 }
 
 bool wxThread::IsRunning() const
 {
-    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
-
-    return p_internal->GetState() == STATE_RUNNING;
+    return m_internal->GetState() == STATE_RUNNING;
 }
 
 bool wxThread::IsAlive() const
 {
 }
 
 bool wxThread::IsAlive() const
 {
-    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
-
-    return (p_internal->GetState() == STATE_RUNNING) ||
-           (p_internal->GetState() == STATE_PAUSED);
+    return (m_internal->GetState() == STATE_RUNNING) ||
+           (m_internal->GetState() == STATE_PAUSED);
 }
 
 bool wxThread::IsPaused() const
 {
 }
 
 bool wxThread::IsPaused() const
 {
-    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
-
-    return (p_internal->GetState() == STATE_PAUSED);
+    return m_internal->GetState() == STATE_PAUSED;
 }
 
 bool wxThread::TestDestroy()
 {
 }
 
 bool wxThread::TestDestroy()
 {
-    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
-
-    return p_internal->GetState() == STATE_CANCELED;
-}
-
-wxThread::wxThread()
-{
-    p_internal = new wxThreadInternal();
-}
-
-wxThread::~wxThread()
-{
-    delete p_internal;
+    return m_internal->GetState() == STATE_CANCELED;
 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------
@@ -703,160 +822,64 @@ IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 
 bool wxThreadModule::OnInit()
 {
 
 bool wxThreadModule::OnInit()
 {
-    // allocate TLS index for storing the pointer to the current thread
-    s_tlsThisThread = ::TlsAlloc();
-    if ( s_tlsThisThread == 0xFFFFFFFF )
+    long response;
+    bool hasThreadManager ;
+    hasThreadManager = Gestalt( gestaltThreadMgrAttr, &response) == noErr && response & 1;
+#if !TARGET_CARBON
+#if GENERATINGCFM
+    // verify presence of shared library
+    hasThreadManager = hasThreadManager && ((Ptr)NewThread != (Ptr)kUnresolvedCFragSymbolAddress);
+#endif
+#endif
+    if ( !hasThreadManager )
     {
     {
-        // in normal circumstances it will only happen if all other
-        // TLS_MINIMUM_AVAILABLE (>= 64) indices are already taken - in other
-        // words, this should never happen
-        wxLogSysError(_("Thread module initialization failed: "
-                        "impossible to allocate index in thread "
-                        "local storage"));
-
-        return FALSE;
+        wxMessageBox( "Error" , "Thread Support is not available on this System" , wxOK ) ;
+        return FALSE ;
     }
 
     }
 
-    // main thread doesn't have associated wxThread object, so store 0 in the
-    // TLS instead
-    if ( !::TlsSetValue(s_tlsThisThread, (LPVOID)0) )
-    {
-        ::TlsFree(s_tlsThisThread);
-        s_tlsThisThread = 0xFFFFFFFF;
-
-        wxLogSysError(_("Thread module initialization failed: "
-                        "can not store value in thread local storage"));
-
-        return FALSE;
-    }
-
-    s_critsectWaitingForGui = new wxCriticalSection();
-
-    s_critsectGui = new wxCriticalSection();
-    s_critsectGui->Enter();
-
     // no error return for GetCurrentThreadId()
     // no error return for GetCurrentThreadId()
-    s_idMainThread = ::GetCurrentThreadId();
+    MacGetCurrentThread( &gs_idMainThread ) ;
 
     return TRUE;
 }
 
 void wxThreadModule::OnExit()
 {
 
     return TRUE;
 }
 
 void wxThreadModule::OnExit()
 {
-    if ( !::TlsFree(s_tlsThisThread) )
-    {
-        wxLogLastError("TlsFree failed.");
-    }
-
-    if ( s_critsectGui )
-    {
-        s_critsectGui->Leave();
-        delete s_critsectGui;
-        s_critsectGui = NULL;
-    }
-
-    wxDELETE(s_critsectWaitingForGui);
 }
 
 // ----------------------------------------------------------------------------
 }
 
 // ----------------------------------------------------------------------------
-// under Windows, these functions are implemented usign a critical section and
-// not a mutex, so the names are a bit confusing
+// under MacOS we don't have currently preemptive threads, so any thread may access
+// the GUI at any time
 // ----------------------------------------------------------------------------
 
 void WXDLLEXPORT wxMutexGuiEnter()
 {
 // ----------------------------------------------------------------------------
 
 void WXDLLEXPORT wxMutexGuiEnter()
 {
-    // this would dead lock everything...
-    wxASSERT_MSG( !wxThread::IsMain(),
-                  wxT("main thread doesn't want to block in wxMutexGuiEnter()!") );
-
-    // the order in which we enter the critical sections here is crucial!!
-
-    // set the flag telling to the main thread that we want to do some GUI
-    {
-        wxCriticalSectionLocker enter(*s_critsectWaitingForGui);
-
-        s_nWaitingForGui++;
-    }
-
-    wxWakeUpMainThread();
-
-    // now we may block here because the main thread will soon let us in
-    // (during the next iteration of OnIdle())
-    s_critsectGui->Enter();
 }
 
 void WXDLLEXPORT wxMutexGuiLeave()
 {
 }
 
 void WXDLLEXPORT wxMutexGuiLeave()
 {
-    wxCriticalSectionLocker enter(*s_critsectWaitingForGui);
-
-    if ( wxThread::IsMain() )
-    {
-        s_bGuiOwnedByMainThread = FALSE;
-    }
-    else
-    {
-        // decrement the number of waiters now
-        wxASSERT_MSG( s_nWaitingForGui > 0,
-                      wxT("calling wxMutexGuiLeave() without entering it first?") );
-
-        s_nWaitingForGui--;
-
-        wxWakeUpMainThread();
-    }
-
-    s_critsectGui->Leave();
 }
 
 void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
 {
 }
 
 void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
 {
-    wxASSERT_MSG( wxThread::IsMain(),
-                  wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
-
-    wxCriticalSectionLocker enter(*s_critsectWaitingForGui);
-
-    if ( s_nWaitingForGui == 0 )
-    {
-        // no threads are waiting for GUI - so we may acquire the lock without
-        // any danger (but only if we don't already have it)
-        if ( !wxGuiOwnedByMainThread() )
-        {
-            s_critsectGui->Enter();
-
-            s_bGuiOwnedByMainThread = TRUE;
-        }
-        //else: already have it, nothing to do
-    }
-    else
-    {
-        // some threads are waiting, release the GUI lock if we have it
-        if ( wxGuiOwnedByMainThread() )
-        {
-            wxMutexGuiLeave();
-        }
-        //else: some other worker thread is doing GUI
-    }
 }
 
 bool WXDLLEXPORT wxGuiOwnedByMainThread()
 {
 }
 
 bool WXDLLEXPORT wxGuiOwnedByMainThread()
 {
-    return s_bGuiOwnedByMainThread;
+    return false ;
 }
 
 }
 
-// wake up the main thread if it's in ::GetMessage()
+// wake up the main thread
 void WXDLLEXPORT wxWakeUpMainThread()
 {
 void WXDLLEXPORT wxWakeUpMainThread()
 {
-    // sending any message would do - hopefully WM_NULL is harmless enough
-    if ( !::PostThreadMessage(s_idMainThread, WM_NULL, 0, 0) )
-    {
-        // should never happen
-        wxLogLastError("PostThreadMessage(WM_NULL)");
-    }
+    wxMacWakeUp() ;
 }
 
 bool WXDLLEXPORT wxIsWaitingForThread()
 {
 }
 
 bool WXDLLEXPORT wxIsWaitingForThread()
 {
-    return s_waitingForThread;
+    return false ;
 }
 }
-*/
 
 #endif // wxUSE_THREADS
 
 #endif // wxUSE_THREADS
+
+// vi:sts=4:sw=4:et
wxWidgets (Impactor)