non-PCH build fix (according to Tinderbox).
[wxWidgets.git] / src / os2 / thread.cpp
index 34ad1a4f14ad02ddcb343efea7d17dbca7ea45db..bcdd9e1934bdddd3064ddf3b10972e435182f802 100644 (file)
 /////////////////////////////////////////////////////////////////////////////
-// Name:        thread.cpp
-// Purpose:     wxThread Implementation. For Unix ports, see e.g. src/gtk
-// Author:      Original from Wolfram Gloger/Guilhem Lavaux
-// Modified by:
+// Name:        src/os2/thread.cpp
+// Purpose:     wxThread Implementation
+// Author:      Original from Wolfram Gloger/Guilhem Lavaux/David Webster
+// Modified by: Stefan Neis
 // Created:     04/22/98
 // RCS-ID:      $Id$
-// Copyright:   (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998)
+// Copyright:   (c) Stefan Neis (2003)
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
-#ifdef __GNUG__
-#pragma implementation "thread.h"
-#endif
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"
+
+#if wxUSE_THREADS
 
-#include "wx/module.h"
 #include "wx/thread.h"
+
+#ifndef WX_PRECOMP
+    #include "wx/intl.h"
+    #include "wx/log.h"
+    #include "wx/app.h"
+    #include "wx/module.h"
+#endif //WX_PRECOMP
+
+#include "wx/apptrait.h"
 #include "wx/utils.h"
 
-#if wxUSE_THREADS
+#include <stdio.h>
 
-enum thread_state {
-  STATE_IDLE = 0,
-  STATE_RUNNING,
-  STATE_CANCELED,
-  STATE_EXITED
+#define INCL_DOSSEMAPHORES
+#define INCL_DOSPROCESS
+#define INCL_DOSMISC
+#define INCL_ERRORS
+#include <os2.h>
+#ifndef __EMX__
+#include <bseerr.h>
+#endif
+// the possible states of the thread ("=>" shows all possible transitions from
+// this state)
+enum wxThreadState
+{
+    STATE_NEW,          // didn't start execution yet (=> RUNNING)
+    STATE_RUNNING,      // thread is running (=> PAUSED, CANCELED)
+    STATE_PAUSED,       // thread is temporarily suspended (=> RUNNING)
+    STATE_CANCELED,     // thread should terminate a.s.a.p. (=> EXITED)
+    STATE_EXITED        // thread is terminating
 };
 
-/////////////////////////////////////////////////////////////////////////////
-// Static variables
-/////////////////////////////////////////////////////////////////////////////
+// ----------------------------------------------------------------------------
+// this module's globals
+// ----------------------------------------------------------------------------
 
-wxMutex *wxMainMutex; // controls access to all GUI functions
+// id of the main thread - the one which can call GUI functions without first
+// calling wxMutexGuiEnter()
+static ULONG                        s_ulIdMainThread = 1;
+wxMutex*                            p_wxMainMutex;
 
-/////////////////////////////////////////////////////////////////////////////
-// Windows implementation
-/////////////////////////////////////////////////////////////////////////////
+// OS2 substitute for Tls pointer the current parent thread object
+wxThread*                           m_pThread;    // pointer to the wxWidgets thread object
+
+// if it's false, some secondary thread is holding the GUI lock
+static bool gs_bGuiOwnedByMainThread = true;
 
-class wxMutexInternal {
+// 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 *gs_pCritsectGui = NULL;
+
+// critical section which protects s_nWaitingForGui variable
+static wxCriticalSection *gs_pCritsectWaitingForGui = NULL;
+
+// number of threads waiting for GUI in wxMutexGuiEnter()
+static size_t gs_nWaitingForGui = 0;
+
+// are we waiting for a thread termination?
+static bool gs_bWaitingForThread = false;
+
+// ============================================================================
+// OS/2 implementation of thread and related classes
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxMutex implementation
+// ----------------------------------------------------------------------------
+class wxMutexInternal
+{
 public:
-  // TODO: internal mutex handle
+    wxMutexInternal(wxMutexType mutexType);
+    ~wxMutexInternal();
+
+    bool IsOk() const { return m_vMutex != NULL; }
+
+    wxMutexError Lock() { return LockTimeout(SEM_INDEFINITE_WAIT); }
+    wxMutexError TryLock() { return LockTimeout(SEM_IMMEDIATE_RETURN); }
+    wxMutexError Unlock();
+
+private:
+    wxMutexError LockTimeout(ULONG ulMilliseconds);
+    HMTX                            m_vMutex;
 };
 
-wxMutex::wxMutex()
+// all mutexes are "pseudo-"recursive under OS2 so we don't use mutexType
+// (Calls to DosRequestMutexSem and DosReleaseMutexSem can be nested, but
+//  the request count for a semaphore cannot exceed 65535. If an attempt is
+//  made to exceed this number, ERROR_TOO_MANY_SEM_REQUESTS is returned.)
+wxMutexInternal::wxMutexInternal(wxMutexType WXUNUSED(eMutexType))
 {
-    p_internal = new wxMutexInternal;
-    // TODO: create internal mutext handle
-    m_locked = 0;
+    APIRET ulrc = ::DosCreateMutexSem(NULL, &m_vMutex, 0L, FALSE);
+    if (ulrc != 0)
+    {
+        wxLogSysError(_("Can not create mutex."));
+        m_vMutex = NULL;
+    }
 }
 
-wxMutex::~wxMutex()
+wxMutexInternal::~wxMutexInternal()
 {
-    if (m_locked > 0)
-        wxDebugMsg("wxMutex warning: freeing a locked mutex (%d locks)\n", m_locked);
-    // TODO: free internal mutext handle
+    if (m_vMutex)
+    {
+        if (::DosCloseMutexSem(m_vMutex))
+            wxLogLastError(_T("DosCloseMutexSem(mutex)"));
+    }
 }
 
-wxMutexError wxMutex::Lock()
+wxMutexError wxMutexInternal::LockTimeout(ULONG ulMilliseconds)
 {
-    // TODO
-    m_locked++;
+    APIRET                          ulrc;
+
+    ulrc = ::DosRequestMutexSem(m_vMutex, ulMilliseconds);
+
+    switch (ulrc)
+    {
+        case ERROR_TIMEOUT:
+        case ERROR_TOO_MANY_SEM_REQUESTS:
+            return wxMUTEX_BUSY;
+
+        case NO_ERROR:
+            // ok
+            break;
+
+        case ERROR_INVALID_HANDLE:
+        case ERROR_INTERRUPT:
+        case ERROR_SEM_OWNER_DIED:
+            wxLogSysError(_("Couldn't acquire a mutex lock"));
+            return wxMUTEX_MISC_ERROR;
+
+        default:
+            wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
+            return wxMUTEX_MISC_ERROR;
+     }
     return wxMUTEX_NO_ERROR;
 }
 
-wxMutexError wxMutex::TryLock()
+wxMutexError wxMutexInternal::Unlock()
 {
-    // TODO
-    m_locked++;
+    APIRET                          ulrc;
+
+    ulrc = ::DosReleaseMutexSem(m_vMutex);
+    if (ulrc != 0)
+    {
+        wxLogSysError(_("Couldn't release a mutex"));
+        return wxMUTEX_MISC_ERROR;
+    }
     return wxMUTEX_NO_ERROR;
 }
 
-wxMutexError wxMutex::Unlock()
+// --------------------------------------------------------------------------
+// wxSemaphore
+// --------------------------------------------------------------------------
+
+// a trivial wrapper around OS2 event semaphore
+class wxSemaphoreInternal
 {
-    if (m_locked > 0)
-        m_locked--;
+public:
+    wxSemaphoreInternal(int initialcount, int maxcount);
+    ~wxSemaphoreInternal();
 
-    // TODO
-    return wxMUTEX_NO_ERROR;
+    bool IsOk() const { return m_vEvent != NULL; }
+
+    wxSemaError Wait() { return WaitTimeout(SEM_INDEFINITE_WAIT); }
+    wxSemaError TryWait() { return WaitTimeout(SEM_IMMEDIATE_RETURN); }
+    wxSemaError WaitTimeout(unsigned long milliseconds);
+
+    wxSemaError Post();
+
+private:
+    HEV m_vEvent;
+    HMTX m_vMutex;
+    int m_count;
+    int m_maxcount;
+};
+
+wxSemaphoreInternal::wxSemaphoreInternal(int initialcount, int maxcount)
+{
+    APIRET ulrc;
+    if ( maxcount == 0 )
+    {
+        // make it practically infinite
+        maxcount = INT_MAX;
+    }
+
+    m_count = initialcount;
+    m_maxcount = maxcount;
+    ulrc = ::DosCreateMutexSem(NULL, &m_vMutex, 0L, FALSE);
+    if (ulrc != 0)
+    {
+        wxLogLastError(_T("DosCreateMutexSem()"));
+        m_vMutex = NULL;
+        m_vEvent = NULL;
+        return;
+    }
+    ulrc = ::DosCreateEventSem(NULL, &m_vEvent, 0L, FALSE);
+    if ( ulrc != 0)
+    {
+        wxLogLastError(_T("DosCreateEventSem()"));
+        ::DosCloseMutexSem(m_vMutex);
+        m_vMutex = NULL;
+        m_vEvent = NULL;
+    }
+    if (initialcount)
+        ::DosPostEventSem(m_vEvent);
 }
 
-class wxConditionInternal {
+wxSemaphoreInternal::~wxSemaphoreInternal()
+{
+    if ( m_vEvent )
+    {
+        if ( ::DosCloseEventSem(m_vEvent) )
+        {
+            wxLogLastError(_T("DosCloseEventSem(semaphore)"));
+        }
+        if ( ::DosCloseMutexSem(m_vMutex) )
+        {
+            wxLogLastError(_T("DosCloseMutexSem(semaphore)"));
+        }
+        else
+            m_vEvent = NULL;
+    }
+}
+
+wxSemaError wxSemaphoreInternal::WaitTimeout(unsigned long ulMilliseconds)
+{
+    APIRET ulrc;
+    do {
+        ulrc = ::DosWaitEventSem(m_vEvent, ulMilliseconds );
+        switch ( ulrc )
+        {
+            case NO_ERROR:
+                break;
+
+            case ERROR_TIMEOUT:
+                if (ulMilliseconds == SEM_IMMEDIATE_RETURN)
+                    return wxSEMA_BUSY;
+                else
+                    return wxSEMA_TIMEOUT;
+
+            default:
+                wxLogLastError(_T("DosWaitEventSem(semaphore)"));
+                return wxSEMA_MISC_ERROR;
+        }
+        ulrc = :: DosRequestMutexSem(m_vMutex, ulMilliseconds);
+        switch ( ulrc )
+        {
+            case NO_ERROR:
+                // ok
+                break;
+
+            case ERROR_TIMEOUT:
+            case ERROR_TOO_MANY_SEM_REQUESTS:
+                if (ulMilliseconds == SEM_IMMEDIATE_RETURN)
+                    return wxSEMA_BUSY;
+                else
+                    return wxSEMA_TIMEOUT;
+
+            default:
+                wxFAIL_MSG(wxT("DosRequestMutexSem(mutex)"));
+                return wxSEMA_MISC_ERROR;
+        }
+        bool OK = false;
+        if (m_count > 0)
+        {
+            m_count--;
+            OK = true;
+        }
+        else
+        {
+            ULONG ulPostCount;
+            ::DosResetEventSem(m_vEvent, &ulPostCount);
+        }
+        ::DosReleaseMutexSem(m_vMutex);
+        if (OK)
+            return wxSEMA_NO_ERROR;
+    } while (ulMilliseconds == SEM_INDEFINITE_WAIT);
+
+    if (ulMilliseconds == SEM_IMMEDIATE_RETURN)
+        return wxSEMA_BUSY;
+    return wxSEMA_TIMEOUT;
+}
+
+wxSemaError wxSemaphoreInternal::Post()
+{
+    APIRET ulrc;
+    ulrc = ::DosRequestMutexSem(m_vMutex, SEM_INDEFINITE_WAIT);
+    if (ulrc != NO_ERROR)
+        return wxSEMA_MISC_ERROR;
+    bool OK = false;
+    if (m_count < m_maxcount)
+    {
+        m_count++;
+        ulrc = ::DosPostEventSem(m_vEvent);
+        OK = true;
+    }
+    ::DosReleaseMutexSem(m_vMutex);
+    if (!OK)
+        return wxSEMA_OVERFLOW;
+    if ( ulrc != NO_ERROR && ulrc != ERROR_ALREADY_POSTED )
+    {
+        wxLogLastError(_T("DosPostEventSem(semaphore)"));
+
+        return wxSEMA_MISC_ERROR;
+    }
+
+    return wxSEMA_NO_ERROR;
+}
+
+// ----------------------------------------------------------------------------
+// wxThread implementation
+// ----------------------------------------------------------------------------
+
+// wxThreadInternal class
+// ----------------------
+
+class wxThreadInternal
+{
 public:
-  // TODO: internal handle
-  int waiters;
+    inline wxThreadInternal()
+    {
+        m_hThread = 0;
+        m_eState = STATE_NEW;
+        m_nPriority = WXTHREAD_DEFAULT_PRIORITY;
+    }
+
+    ~wxThreadInternal()
+    {
+        m_hThread = 0;
+    }
+
+    // create a new (suspended) thread (for the given thread object)
+    bool Create( wxThread*    pThread
+                ,unsigned int uStackSize
+               );
+
+    // suspend/resume/terminate
+    bool Suspend();
+    bool Resume();
+    inline void Cancel() { m_eState = STATE_CANCELED; }
+
+    // thread state
+    inline void SetState(wxThreadState eState) { m_eState = eState; }
+    inline wxThreadState GetState() const { return m_eState; }
+
+    // thread priority
+    void                SetPriority(unsigned int nPriority);
+    inline unsigned int GetPriority() const { return m_nPriority; }
+
+    // thread handle and id
+    inline TID GetHandle() const { return m_hThread; }
+    TID  GetId() const { return m_hThread; }
+
+    // thread function
+    static void OS2ThreadStart(void* pParam);
+
+private:
+    // Threads in OS/2 have only an ID, so m_hThread is both it's handle and ID
+    // PM also has no real Tls mechanism to index pointers by so we'll just
+    // keep track of the wxWidgets parent object here.
+    TID                             m_hThread;    // handle and ID of the thread
+    wxThreadState                   m_eState;     // state, see wxThreadState enum
+    unsigned int                    m_nPriority;  // thread priority in "wx" units
 };
 
-wxCondition::wxCondition()
+void wxThreadInternal::OS2ThreadStart( void * pParam )
 {
-    p_internal = new wxConditionInternal;
-    // TODO: create internal handle
-    p_internal->waiters = 0;
+    DWORD dwRet;
+    bool bWasCancelled;
+
+    wxThread *pThread = (wxThread *)pParam;
+
+    // first of all, wait for the thread to be started.
+    pThread->m_critsect.Enter();
+    pThread->m_critsect.Leave();
+    // Now check whether we hadn't been cancelled already and don't
+    // start the user code at all in this case.
+    if ( pThread->m_internal->GetState() == STATE_EXITED )
+    {
+        dwRet = (DWORD)-1;
+        bWasCancelled = true;
+    }
+    else // do run thread
+    {
+        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+        unsigned long ulHab;
+        if (traits)
+            traits->InitializeGui(ulHab);
+        dwRet = (DWORD)pThread->Entry();
+        if (traits)
+            traits->TerminateGui(ulHab);
+
+        // enter m_critsect before changing the thread state
+        pThread->m_critsect.Enter();
+
+        bWasCancelled = pThread->m_internal->GetState() == STATE_CANCELED;
+
+        pThread->m_internal->SetState(STATE_EXITED);
+        pThread->m_critsect.Leave();
+    }
+    pThread->OnExit();
+
+    // if the thread was cancelled (from Delete()), then it the handle is still
+    // needed there
+    if (pThread->IsDetached() && !bWasCancelled)
+    {
+        // auto delete
+        delete pThread;
+    }
+    //else: the joinable threads handle will be closed when Wait() is done
+    return;
 }
 
-wxCondition::~wxCondition()
+void wxThreadInternal::SetPriority(
+  unsigned int                      nPriority
+)
 {
-    // TODO: destroy internal handle
+    // translate wxWidgets priority to the PM one
+    ULONG                           ulOS2_PriorityClass;
+    ULONG                           ulOS2_SubPriority;
+    ULONG                           ulrc;
+
+    m_nPriority = nPriority;
+    if (m_nPriority <= 25)
+        ulOS2_PriorityClass = PRTYC_IDLETIME;
+    else if (m_nPriority <= 50)
+        ulOS2_PriorityClass = PRTYC_REGULAR;
+    else if (m_nPriority <= 75)
+        ulOS2_PriorityClass = PRTYC_TIMECRITICAL;
+    else if (m_nPriority <= 100)
+        ulOS2_PriorityClass = PRTYC_FOREGROUNDSERVER;
+    else
+    {
+        wxFAIL_MSG(wxT("invalid value of thread priority parameter"));
+        ulOS2_PriorityClass = PRTYC_REGULAR;
+    }
+    ulOS2_SubPriority = (ULONG) (((m_nPriority - 1) % 25 + 1) * 31.0 / 25);
+    ulrc = ::DosSetPriority( PRTYS_THREAD
+                            ,ulOS2_PriorityClass
+                            ,ulOS2_SubPriority
+                            ,(ULONG)m_hThread
+                           );
+    if (ulrc != 0)
+    {
+        wxLogSysError(_("Can't set thread priority"));
+    }
 }
 
-void wxCondition::Wait(wxMutex& mutex)
+bool wxThreadInternal::Create( wxThread* pThread,
+                               unsigned int uStackSize)
 {
-    mutex.Unlock();
-    p_internal->waiters++;
-    // TODO wait here
-    p_internal->waiters--;
-    mutex.Lock();
+    int tid;
+
+    if (!uStackSize)
+        uStackSize = 131072;
+
+    pThread->m_critsect.Enter();
+    tid = _beginthread(wxThreadInternal::OS2ThreadStart,
+                             NULL, uStackSize, pThread);
+    if(tid == -1)
+    {
+        wxLogSysError(_("Can't create thread"));
+
+        return false;
+    }
+    m_hThread = tid;
+    if (m_nPriority != WXTHREAD_DEFAULT_PRIORITY)
+    {
+        SetPriority(m_nPriority);
+    }
+
+    return true;
 }
 
-bool wxCondition::Wait(wxMutex& mutex, unsigned long sec,
-                       unsigned long nsec)
+bool wxThreadInternal::Suspend()
 {
-    mutex.Unlock();
-    p_internal->waiters++;
+    ULONG ulrc = ::DosSuspendThread(m_hThread);
 
-    // TODO wait here
-    p_internal->waiters--;
-    mutex.Lock();
+    if (ulrc != 0)
+    {
+        wxLogSysError(_("Can not suspend thread %lu"), m_hThread);
+        return false;
+    }
+    m_eState = STATE_PAUSED;
 
-    return FALSE;
+    return true;
 }
 
-void wxCondition::Signal()
+bool wxThreadInternal::Resume()
 {
-    // TODO
+    ULONG ulrc = ::DosResumeThread(m_hThread);
+
+    if (ulrc != 0)
+    {
+        wxLogSysError(_("Can not resume thread %lu"), m_hThread);
+        return false;
+    }
+
+    // don't change the state from STATE_EXITED because it's special and means
+    // we are going to terminate without running any user code - if we did it,
+    // the codei n Delete() wouldn't work
+    if ( m_eState != STATE_EXITED )
+    {
+        m_eState = STATE_RUNNING;
+    }
+
+    return true;
 }
 
-void wxCondition::Broadcast()
+// static functions
+// ----------------
+
+wxThread *wxThread::This()
 {
-    // TODO
+    wxThread*                       pThread = m_pThread;
+    return pThread;
 }
 
-class wxThreadInternal {
-public:
-    // TODO
-};
+bool wxThread::IsMain()
+{
+    PTIB ptib;
+    PPIB ppib;
 
-wxThreadError wxThread::Create()
+    ::DosGetInfoBlocks(&ptib, &ppib);
+
+    if (ptib->tib_ptib2->tib2_ultid == s_ulIdMainThread)
+        return true;
+
+    return false;
+}
+
+#ifdef Yield
+    #undef Yield
+#endif
+
+void wxThread::Yield()
 {
-    // TODO
-    return wxTHREAD_NO_ERROR;
+    ::DosSleep(0);
 }
 
-wxThreadError wxThread::Destroy()
+void wxThread::Sleep(
+  unsigned long                     ulMilliseconds
+)
 {
-    // TODO
-    return wxTHREAD_NO_ERROR;
+    ::DosSleep(ulMilliseconds);
 }
 
-wxThreadError wxThread::Pause()
+int wxThread::GetCPUCount()
 {
-    // TODO
-    return wxTHREAD_NO_ERROR;
+    ULONG CPUCount;
+    APIRET ulrc;
+    ulrc = ::DosQuerySysInfo(26, 26, (void *)&CPUCount, sizeof(ULONG));
+    // QSV_NUMPROCESSORS(26) is typically not defined in header files
+
+    if (ulrc != 0)
+        CPUCount = 1;
+
+    return CPUCount;
 }
 
-wxThreadError wxThread::Resume()
+unsigned long wxThread::GetCurrentId()
+{
+    PTIB                            ptib;
+    PPIB                            ppib;
+
+    ::DosGetInfoBlocks(&ptib, &ppib);
+    return (unsigned long) ptib->tib_ptib2->tib2_ultid;
+}
+
+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;
+
+    // Don't know how to realize this on OS/2.
+    return level == 1;
+}
+
+// ctor and dtor
+// -------------
+
+wxThread::wxThread(wxThreadKind kind)
+{
+    m_internal = new wxThreadInternal();
+
+    m_isDetached = kind == wxTHREAD_DETACHED;
+}
+
+wxThread::~wxThread()
+{
+    delete m_internal;
+}
+
+// create/start thread
+// -------------------
+
+wxThreadError wxThread::Create(
+  unsigned int                      uStackSize
+)
 {
-    // TODO
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+    if ( !m_internal->Create(this, uStackSize) )
+        return wxTHREAD_NO_RESOURCE;
+
     return wxTHREAD_NO_ERROR;
 }
 
-void wxThread::Exit(void *status)
+wxThreadError wxThread::Run()
 {
-    // TODO
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    if ( m_internal->GetState() != STATE_NEW )
+    {
+        // actually, it may be almost any state at all, not only STATE_RUNNING
+        return wxTHREAD_RUNNING;
+    }
+    return Resume();
 }
 
-void wxThread::SetPriority(int prio)
+// suspend/resume thread
+// ---------------------
+
+wxThreadError wxThread::Pause()
 {
-    // TODO
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 }
 
-int wxThread::GetPriority() const
+wxThreadError wxThread::Resume()
 {
-    // TODO
-    return 0;
+    if (m_internal->GetState() == STATE_NEW)
+    {
+        m_internal->SetState(STATE_RUNNING);
+        m_critsect.Leave();
+        return wxTHREAD_NO_ERROR;
+    }
+
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
 }
 
-void wxThread::DeferDestroy(bool on)
+// stopping thread
+// ---------------
+
+wxThread::ExitCode wxThread::Wait()
 {
-    // TODO
+    // although under Windows 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);
+    return(rc);
 }
 
-void wxThread::TestDestroy()
+wxThreadError wxThread::Delete(ExitCode *pRc)
 {
-    // TODO
+    ExitCode rc = 0;
+
+    // Delete() is always safe to call, so consider all possible states
+
+    // we might need to resume the thread, but we might also not need to cancel
+    // it if it doesn't run yet
+    bool shouldResume = false,
+         shouldCancel = true,
+         isRunning = false;
+
+    // check if the thread already started to run
+    {
+        wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+        if ( m_internal->GetState() == STATE_NEW )
+        {
+            // WinThreadStart() will see it and terminate immediately, no need
+            // to cancel the thread - but we still need to resume it to let it
+            // run
+            m_internal->SetState(STATE_EXITED);
+
+            Resume();   // it knows about STATE_EXITED special case
+
+            shouldCancel = false;
+            isRunning = true;
+
+            // shouldResume is correctly set to false here
+        }
+        else
+        {
+            shouldResume = IsPaused();
+        }
+    }
+
+    // resume the thread if it is paused
+    if ( shouldResume )
+        Resume();
+
+    TID hThread = m_internal->GetHandle();
+
+    if ( isRunning || IsRunning())
+    {
+        if (IsMain())
+        {
+            // set flag for wxIsWaitingForThread()
+            gs_bWaitingForThread = true;
+        }
+
+        // ask the thread to terminate
+        if ( shouldCancel )
+        {
+            wxCriticalSectionLocker lock(m_critsect);
+
+            m_internal->Cancel();
+        }
+
+#if 0
+        // 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 = 0;       // suppress warnings from broken compilers
+        do
+        {
+            if ( IsMain() )
+            {
+                // give the thread we're waiting for chance to do the GUI call
+                // it might be in
+                if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
+                {
+                    wxMutexGuiLeave();
+                }
+            }
+
+            result = ::DosWaitThread(&hThread, DCWW_NOWAIT);
+            // FIXME: We ought to have a message processing loop here!!
+
+            switch ( result )
+            {
+                case ERROR_INTERRUPT:
+                case ERROR_THREAD_NOT_TERMINATED:
+                    break;
+                case ERROR_INVALID_THREADID:
+                case NO_ERROR:
+                    // thread we're waiting for just terminated
+                    // or even does not exist any more.
+                    result = NO_ERROR;
+                    break;
+                default:
+                    wxFAIL_MSG(wxT("unexpected result of DosWaitThread"));
+            }
+            if ( IsMain() )
+            {
+                // event processing - needed if we are the main thread
+                // to give other threads a chance to do remaining GUI
+                // processing and terminate cleanly.
+                wxTheApp->HandleSockets();
+                if (wxTheApp->Pending())
+                  if ( !wxTheApp->DoMessage() )
+                  {
+                      // WM_QUIT received: kill the thread
+                      Kill();
+
+                      return wxTHREAD_KILLED;
+                  }
+                  else
+                    wxUsleep(10);
+            }
+            else
+                wxUsleep(10);
+        } while ( result != NO_ERROR );
+#else // !wxUSE_GUI
+        // simply wait for the thread to terminate
+        //
+        // OTOH, even console apps create windows (in wxExecute, for WinSock
+        // &c), so may be use MsgWaitForMultipleObject() too here?
+        if ( ::DosWaitThread(&hThread, DCWW_WAIT) != NO_ERROR )
+        {
+            wxFAIL_MSG(wxT("unexpected result of DosWaitThread"));
+        }
+#endif // wxUSE_GUI/!wxUSE_GUI
+
+        if ( IsMain() )
+        {
+            gs_bWaitingForThread = false;
+        }
+    }
+
+#if 0
+    // although the thread might be already in the EXITED state it might not
+    // have terminated yet and so we are not sure that it has actually
+    // terminated if the "if" above hadn't been taken
+    do
+    {
+        if ( !::GetExitCodeThread(hThread, (LPDWORD)&rc) )
+        {
+            wxLogLastError(wxT("GetExitCodeThread"));
+
+            rc = (ExitCode)-1;
+        }
+    } while ( (DWORD)rc == STILL_ACTIVE );
+#endif
+
+    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 thread handle was
+        // closed while we were waiting on it, so we must do it here
+        delete this;
+    }
+
+    if ( pRc )
+        *pRc = rc;
+
+    return rc == (ExitCode)-1 ? wxTHREAD_MISC_ERROR : wxTHREAD_NO_ERROR;
 }
 
-void *wxThread::Join()
+wxThreadError wxThread::Kill()
 {
-    // TODO
-    return (void*) NULL;
+    if (!IsRunning())
+        return wxTHREAD_NOT_RUNNING;
+
+    ::DosKillThread(m_internal->GetHandle());
+    if (IsDetached())
+    {
+        delete this;
+    }
+    return wxTHREAD_NO_ERROR;
 }
 
-unsigned long wxThread::GetID() const
+void wxThread::Exit(ExitCode WXUNUSED(pStatus))
 {
-    // TODO
-    return 0;
+    delete this;
+    _endthread();
+    wxFAIL_MSG(wxT("Couldn't return from DosExit()!"));
 }
 
-/*
-wxThread *wxThread::GetThreadFromID(unsigned long id)
+void wxThread::SetPriority(
+  unsigned int                      nPrio
+)
 {
-    // TODO
-    return NULL;
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    m_internal->SetPriority(nPrio);
 }
-*/
 
-bool wxThread::IsAlive() const
+unsigned int wxThread::GetPriority() const
 {
-    // TODO
-    return FALSE;
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    return m_internal->GetPriority();
 }
 
-bool wxThread::IsRunning() const
+unsigned long wxThread::GetId() const
 {
-    // TODO
-    return FALSE;
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+    return (unsigned long)m_internal->GetId();
 }
 
-bool wxThread::IsMain()
+bool wxThread::IsRunning() const
 {
-    // TODO
-    return FALSE;
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    return(m_internal->GetState() == STATE_RUNNING);
 }
 
-wxThread::wxThread()
+bool wxThread::IsAlive() const
 {
-    p_internal = new wxThreadInternal();
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
 
-    // TODO
+    return (m_internal->GetState() == STATE_RUNNING) ||
+           (m_internal->GetState() == STATE_PAUSED);
 }
 
-wxThread::~wxThread()
+bool wxThread::IsPaused() const
 {
-    Destroy();
-    Join();
-    delete p_internal;
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    return (m_internal->GetState() == STATE_PAUSED);
 }
 
-// The default callback just joins the thread and throws away the result.
-void wxThread::OnExit()
+bool wxThread::TestDestroy()
 {
-    Join();
+    wxCriticalSectionLocker         lock((wxCriticalSection &)m_critsect);
+
+    return m_internal->GetState() == STATE_CANCELED;
 }
 
-// Automatic initialization
-class wxThreadModule : public wxModule {
-  DECLARE_DYNAMIC_CLASS(wxThreadModule)
+// ----------------------------------------------------------------------------
+// Automatic initialization for thread module
+// ----------------------------------------------------------------------------
+
+class wxThreadModule : public wxModule
+{
 public:
-  virtual bool OnInit() {
-    /* TODO p_mainid = GetCurrentThread(); */
-    wxMainMutex = new wxMutex();
-    wxMainMutex->Lock();
-    return TRUE;
-  }
-
-  // Global cleanup
-  virtual void OnExit() {
-    wxMainMutex->Unlock();
-    delete wxMainMutex;
-  }
+    virtual bool OnInit();
+    virtual void OnExit();
+
+private:
+    DECLARE_DYNAMIC_CLASS(wxThreadModule)
 };
 
 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 
+bool wxThreadModule::OnInit()
+{
+    gs_pCritsectWaitingForGui = new wxCriticalSection();
+
+    gs_pCritsectGui = new wxCriticalSection();
+    gs_pCritsectGui->Enter();
+
+    PTIB ptib;
+    PPIB ppib;
+
+    ::DosGetInfoBlocks(&ptib, &ppib);
+
+    s_ulIdMainThread = ptib->tib_ptib2->tib2_ultid;
+    return true;
+}
+
+void wxThreadModule::OnExit()
+{
+    if (gs_pCritsectGui)
+    {
+        gs_pCritsectGui->Leave();
+#if (!(defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )))
+        delete gs_pCritsectGui;
+#endif
+        gs_pCritsectGui = NULL;
+    }
+
+#if (!(defined(__VISAGECPP__) && (__IBMCPP__ < 400 || __IBMC__ < 400 )))
+    wxDELETE(gs_pCritsectWaitingForGui);
+#endif
+}
+
+// ----------------------------------------------------------------------------
+// Helper functions
+// ----------------------------------------------------------------------------
+
+// wake up the main thread if it's in ::GetMessage()
+void WXDLLEXPORT wxWakeUpMainThread()
+{
+#if 0
+    if ( !::WinPostQueueMsg(wxTheApp->m_hMq, WM_NULL, 0, 0) )
+    {
+        // should never happen
+        wxLogLastError(wxT("WinPostMessage(WM_NULL)"));
+    }
+#endif
+}
+
+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(*gs_pCritsectWaitingForGui);
+
+        gs_nWaitingForGui++;
+    }
+
+    wxWakeUpMainThread();
+
+    // now we may block here because the main thread will soon let us in
+    // (during the next iteration of OnIdle())
+    gs_pCritsectGui->Enter();
+}
+
+void WXDLLEXPORT wxMutexGuiLeave()
+{
+    wxCriticalSectionLocker enter(*gs_pCritsectWaitingForGui);
+
+    if ( wxThread::IsMain() )
+    {
+        gs_bGuiOwnedByMainThread = false;
+    }
+    else
+    {
+        // decrement the number of waiters now
+        wxASSERT_MSG(gs_nWaitingForGui > 0,
+                      wxT("calling wxMutexGuiLeave() without entering it first?") );
+
+        gs_nWaitingForGui--;
+
+        wxWakeUpMainThread();
+    }
+
+    gs_pCritsectGui->Leave();
+}
+
+void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
+{
+    wxASSERT_MSG( wxThread::IsMain(),
+                  wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
+
+    wxCriticalSectionLocker enter(*gs_pCritsectWaitingForGui);
+
+    if (gs_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())
+        {
+            gs_pCritsectGui->Enter();
+
+            gs_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()
+{
+    return gs_bGuiOwnedByMainThread;
+}
+
+bool WXDLLEXPORT wxIsWaitingForThread()
+{
+    return gs_bWaitingForThread;
+}
+
+// ----------------------------------------------------------------------------
+// include common implementation code
+// ----------------------------------------------------------------------------
+
+#include "wx/thrimpl.cpp"
+
 #endif
   // wxUSE_THREADS