X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/b89156b5dbb3c1270452379801a79613cd69bb32..d4380aafddd41fcb56fc787c19a710bf79d45311:/src/msw/thread.cpp?ds=sidebyside

diff --git a/src/msw/thread.cpp b/src/msw/thread.cpp
index 33ca0a645a..f7e9f0517b 100644
--- a/src/msw/thread.cpp
+++ b/src/msw/thread.cpp
@@ -2,321 +2,1433 @@
 // Name:        thread.cpp
 // Purpose:     wxThread Implementation
 // Author:      Original from Wolfram Gloger/Guilhem Lavaux
-// Modified by:
+// Modified by: Vadim Zeitlin to make it work :-)
 // Created:     04/22/98
 // RCS-ID:      $Id$
-// Copyright:   (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998)
+// Copyright:   (c) Wolfram Gloger (1996, 1997); Guilhem Lavaux (1998),
+//                  Vadim Zeitlin (1999)
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 
 #ifdef __GNUG__
-#pragma implementation "thread.h"
+    #pragma implementation "thread.h"
 #endif
 
+// ----------------------------------------------------------------------------
+// headers
+// ----------------------------------------------------------------------------
+
+// For compilers that support precompilation, includes "wx.h".
 #include "wx/wxprec.h"
 
 #if defined(__BORLANDC__)
-#pragma hdrstop
+    #pragma hdrstop
 #endif
 
 #ifndef WX_PRECOMP
-#include "wx/wx.h"
+#    include "wx/wx.h"
 #endif
 
-#include <stdio.h>
+#if wxUSE_THREADS
+
+#include "wx/msw/private.h"
 
-#include <windows.h>
 #include "wx/module.h"
 #include "wx/thread.h"
 
-enum thread_state {
-  STATE_IDLE = 0,
-  STATE_RUNNING,
-  STATE_CANCELED,
-  STATE_EXITED
+#ifdef Yield
+#    undef Yield
+#endif
+
+// must have this symbol defined to get _beginthread/_endthread declarations
+#ifndef _MT
+    #define _MT
+#endif
+
+#if defined(__BORLANDC__)
+    #if !defined(__MT__)
+        // I can't set -tWM in the IDE (anyone?) so have to do this
+        #define __MT__
+    #endif
+
+    #if !defined(__MFC_COMPAT__)
+        // Needed to know about _beginthreadex etc..
+        #define __MFC_COMPAT__
+    #endif
+#endif // BC++
+
+// define wxUSE_BEGIN_THREAD if the compiler has _beginthreadex() function
+// which should be used instead of Win32 ::CreateThread() if possible
+#if defined(__VISUALC__) || \
+    (defined(__BORLANDC__) && (__BORLANDC__ >= 0x500)) || \
+    (defined(__GNUG__) && defined(__MSVCRT__)) || \
+    defined(__WATCOMC__) || defined(__MWERKS__)
+
+    #undef wxUSE_BEGIN_THREAD
+    #define wxUSE_BEGIN_THREAD
+#endif
+
+#ifdef wxUSE_BEGIN_THREAD
+    // this is where _beginthreadex() is declared
+    #include <process.h>
+
+    // the return type of the thread function entry point
+    typedef unsigned THREAD_RETVAL;
+
+    // the calling convention of the thread function entry point
+    #define THREAD_CALLCONV __stdcall
+#else
+    // the settings for CreateThread()
+    typedef DWORD THREAD_RETVAL;
+    #define THREAD_CALLCONV WINAPI
+#endif
+
+// ----------------------------------------------------------------------------
+// constants
+// ----------------------------------------------------------------------------
+
+// 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 globals
+// ----------------------------------------------------------------------------
 
-static HANDLE p_mainid;
-wxMutex wxMainMutex; // controls access to all GUI functions
+// TLS index of the slot where we store the pointer to the current thread
+static DWORD gs_tlsThisThread = 0xFFFFFFFF;
 
-/////////////////////////////////////////////////////////////////////////////
-// Windows implementation
-/////////////////////////////////////////////////////////////////////////////
+// id of the main thread - the one which can call GUI functions without first
+// calling wxMutexGuiEnter()
+static DWORD gs_idMainThread = 0;
+
+// if it's FALSE, some secondary thread is holding the GUI lock
+static bool gs_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 *gs_critsectGui = NULL;
+
+// critical section which protects gs_nWaitingForGui variable
+static wxCriticalSection *gs_critsectWaitingForGui = 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_waitingForThread = FALSE;
+
+// ============================================================================
+// Windows implementation of thread classes
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxMutex implementation
+// ----------------------------------------------------------------------------
+
+class wxMutexInternal
+{
+public:
+    wxMutexInternal()
+    {
+        m_mutex = ::CreateMutex(NULL, FALSE, NULL);
+        if ( !m_mutex )
+        {
+            wxLogSysError(_("Can not create mutex"));
+        }
+    }
+
+    ~wxMutexInternal() { if ( m_mutex ) ::CloseHandle(m_mutex); }
 
-class wxMutexInternal {
 public:
-  HANDLE p_mutex;
+    HANDLE m_mutex;
 };
 
 wxMutex::wxMutex()
 {
-  p_internal = new wxMutexInternal;
-  p_internal->p_mutex = CreateMutex(NULL, FALSE, NULL);
-  m_locked = 0;
+    m_internal = new wxMutexInternal;
+
+    m_locked = 0;
 }
 
 wxMutex::~wxMutex()
 {
-  if (m_locked > 0)
-    wxDebugMsg("wxMutex warning: freeing a locked mutex (%d locks)\n", 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()
 {
-  DWORD ret;
+    DWORD ret;
+
+    ret = WaitForSingleObject(m_internal->m_mutex, INFINITE);
+    switch ( ret )
+    {
+        case WAIT_ABANDONED:
+            return wxMUTEX_BUSY;
+
+        case WAIT_OBJECT_0:
+            // ok
+            break;
 
-  ret = WaitForSingleObject(p_internal->p_mutex, INFINITE);
-  if (ret == WAIT_ABANDONED)
-    return MUTEX_BUSY;
+        case WAIT_FAILED:
+            wxLogSysError(_("Couldn't acquire a mutex lock"));
+            return wxMUTEX_MISC_ERROR;
 
-  m_locked++;
-  return MUTEX_NO_ERROR;
+        case WAIT_TIMEOUT:
+        default:
+            wxFAIL_MSG(wxT("impossible return value in wxMutex::Lock"));
+    }
+
+    m_locked++;
+    return wxMUTEX_NO_ERROR;
 }
 
 wxMutexError wxMutex::TryLock()
 {
-  DWORD ret;
+    DWORD ret;
 
-  ret = WaitForSingleObject(p_internal->p_mutex, 0);
-  if (ret == WAIT_TIMEOUT || ret == WAIT_ABANDONED)
-    return MUTEX_BUSY;
+    ret = WaitForSingleObject(m_internal->m_mutex, 0);
+    if (ret == WAIT_TIMEOUT || ret == WAIT_ABANDONED)
+        return wxMUTEX_BUSY;
 
-  m_locked++;
-  return MUTEX_NO_ERROR;
+    m_locked++;
+    return wxMUTEX_NO_ERROR;
 }
 
 wxMutexError wxMutex::Unlock()
 {
-  BOOL ret;
+    if (m_locked > 0)
+        m_locked--;
 
-  if (m_locked > 0)
-    m_locked--;
+    BOOL ret = ReleaseMutex(m_internal->m_mutex);
+    if ( ret == 0 )
+    {
+        wxLogSysError(_("Couldn't release a mutex"));
+        return wxMUTEX_MISC_ERROR;
+    }
 
-    // Why does this have 3 args? The redundant ones removed by JACS
-//  ret = ReleaseMutex(p_internal->p_mutex, 1, NULL);
-  ret = ReleaseMutex(p_internal->p_mutex);
-  return MUTEX_NO_ERROR;
+    return wxMUTEX_NO_ERROR;
 }
 
-class wxConditionInternal {
+// ==========================================================================
+// wxSemaphore
+// ==========================================================================
+
+// --------------------------------------------------------------------------
+// wxSemaphoreInternal
+// --------------------------------------------------------------------------
+
+class wxSemaphoreInternal
+{
 public:
-  HANDLE event;
-  int waiters;
+    wxSemaphoreInternal( int initialcount = 0, int maxcount = 0 );
+    ~wxSemaphoreInternal();
+
+    void Wait();
+    bool TryWait();
+
+    bool Wait( unsigned long timeout_millis );
+
+    void Post();
+
+private:
+    HANDLE m_semaphore;
 };
 
-wxCondition::wxCondition()
+wxSemaphoreInternal::wxSemaphoreInternal( int initialcount, int maxcount )
 {
-  p_internal = new wxConditionInternal;
-  p_internal->event = CreateEvent(NULL, FALSE, FALSE, NULL);
-  p_internal->waiters = 0;
+    if ( maxcount == 0 )
+    {
+        // make it practically infinite
+        maxcount = INT_MAX;
+    }
+
+    m_semaphore = ::CreateSemaphore( NULL, initialcount, maxcount, NULL );
+    if ( !m_semaphore )
+    {
+        wxLogLastError(_T("CreateSemaphore()"));
+    }
 }
 
-wxCondition::~wxCondition()
+wxSemaphoreInternal::~wxSemaphoreInternal()
 {
-  CloseHandle(p_internal->event);
+    CloseHandle( m_semaphore );
 }
 
-void wxCondition::Wait(wxMutex& mutex)
+void wxSemaphoreInternal::Wait()
 {
-  mutex.Unlock();
-  p_internal->waiters++;
-  WaitForSingleObject(p_internal->event, INFINITE);
-  p_internal->waiters--;
-  mutex.Lock();
+    if ( ::WaitForSingleObject( m_semaphore, INFINITE ) != WAIT_OBJECT_0 )
+    {
+        wxLogLastError(_T("WaitForSingleObject"));
+    }
 }
 
-bool wxCondition::Wait(wxMutex& mutex, unsigned long sec,
-                       unsigned long nsec)
+bool wxSemaphoreInternal::TryWait()
 {
-  DWORD ret;
+    return Wait(0);
+}
+
+bool wxSemaphoreInternal::Wait( unsigned long timeout_millis )
+{
+    DWORD result = ::WaitForSingleObject( m_semaphore, timeout_millis );
+
+    switch ( result )
+    {
+        case WAIT_OBJECT_0:
+           return TRUE;
 
-  mutex.Unlock();
-  p_internal->waiters++;
-  ret = WaitForSingleObject(p_internal->event, (sec*1000)+(nsec/1000000));
-  p_internal->waiters--;
-  mutex.Lock();
+        case WAIT_TIMEOUT:
+           break;
 
-  return (ret != WAIT_TIMEOUT);
+        default:
+            wxLogLastError(_T("WaitForSingleObject()"));
+    }
+
+    return FALSE;
 }
 
-void wxCondition::Signal()
+void wxSemaphoreInternal::Post()
 {
-  SetEvent(p_internal->event);
+    if ( !::ReleaseSemaphore( m_semaphore, 1, NULL ) )
+    {
+        wxLogLastError(_T("ReleaseSemaphore"));
+    }
 }
 
-void wxCondition::Broadcast()
+// --------------------------------------------------------------------------
+// wxSemaphore
+// --------------------------------------------------------------------------
+
+wxSemaphore::wxSemaphore( int initialcount, int maxcount )
 {
-  int i;
+    m_internal = new wxSemaphoreInternal( initialcount, maxcount );
+}
+
+wxSemaphore::~wxSemaphore()
+{
+    delete m_internal;
+}
+
+void wxSemaphore::Wait()
+{
+    m_internal->Wait();
+}
+
+bool wxSemaphore::TryWait()
+{
+    return m_internal->TryWait();
+}
+
+bool wxSemaphore::Wait( unsigned long timeout_millis )
+{
+    return m_internal->Wait( timeout_millis );
+}
 
-  for (i=0;i<p_internal->waiters;i++)
-    SetEvent(p_internal->event);
+void wxSemaphore::Post()
+{
+    m_internal->Post();
 }
 
-class wxThreadInternal {
+
+// ==========================================================================
+// wxCondition
+// ==========================================================================
+
+// --------------------------------------------------------------------------
+// wxConditionInternal
+// --------------------------------------------------------------------------
+
+class wxConditionInternal
+{
 public:
-  static DWORD WinThreadStart(LPVOID arg);
+    wxConditionInternal(wxMutex& mutex);
+
+    void Wait();
+
+    bool Wait( unsigned long timeout_millis );
+
+    void Signal();
+
+    void Broadcast();
+
+private:
+    int m_numWaiters;
+    wxMutex m_mutexNumWaiters;
+
+    wxMutex& m_mutex;
+
+    wxSemaphore m_semaphore;
 
-  HANDLE thread_id;
-  int state;
-  int prio, defer;
-  DWORD tid;
+    DECLARE_NO_COPY_CLASS(wxConditionInternal)
 };
 
-DWORD wxThreadInternal::WinThreadStart(LPVOID arg)
+wxConditionInternal::wxConditionInternal(wxMutex& mutex)
+                   : m_mutex(mutex)
+{
+
+    m_numWaiters = 0;
+}
+
+void wxConditionInternal::Wait()
+{
+    // increment the number of waiters
+    m_mutexNumWaiters.Lock();
+    m_numWaiters++;
+    m_mutexNumWaiters.Unlock();
+
+    m_mutex.Unlock();
+
+    // a potential race condition can occur here
+    //
+    // after a thread increments nwaiters, and unlocks the mutex and before the
+    // semaphore.Wait() is called, if another thread can cause a signal to be
+    // generated
+    //
+    // this race condition is handled by using a semaphore and incrementing the
+    // semaphore only if 'nwaiters' is greater that zero since the semaphore,
+    // can 'remember' signals the race condition will not occur
+
+    // wait ( if necessary ) and decrement semaphore
+    m_semaphore.Wait();
+
+    m_mutex.Lock();
+}
+
+bool wxConditionInternal::Wait( unsigned long timeout_millis )
+{
+    m_mutexNumWaiters.Lock();
+    m_numWaiters++;
+    m_mutexNumWaiters.Unlock();
+
+    m_mutex.Unlock();
+
+    // a race condition can occur at this point in the code
+    //
+    // please see the comments in Wait(), for details
+
+    bool success = TRUE;
+
+    bool result = m_semaphore.Wait( timeout_millis );
+
+    if ( !result )
+    {
+        // another potential race condition exists here it is caused when a
+        // 'waiting' thread timesout, and returns from WaitForSingleObject, but
+        // has not yet decremented 'nwaiters'.
+        //
+        // at this point if another thread calls signal() then the semaphore
+        // will be incremented, but the waiting thread will miss it.
+        //
+        // to handle this particular case, the waiting thread calls
+        // WaitForSingleObject again with a timeout of 0, after locking
+        // 'nwaiters_mutex'. this call does not block because of the zero
+        // timeout, but will allow the waiting thread to catch the missed
+        // signals.
+        m_mutexNumWaiters.Lock();
+        result = m_semaphore.Wait( 0 );
+
+        if ( !result )
+        {
+            m_numWaiters--;
+            success = FALSE;
+        }
+
+        m_mutexNumWaiters.Unlock();
+    }
+
+    m_mutex.Lock();
+
+    return success;
+}
+
+void wxConditionInternal::Signal()
+{
+    m_mutexNumWaiters.Lock();
+
+    if ( m_numWaiters > 0 )
+    {
+        // increment the semaphore by 1
+        m_semaphore.Post();
+
+        m_numWaiters--;
+    }
+
+    m_mutexNumWaiters.Unlock();
+}
+
+void wxConditionInternal::Broadcast()
+{
+    m_mutexNumWaiters.Lock();
+
+    while ( m_numWaiters > 0 )
+    {
+        m_semaphore.Post();
+        m_numWaiters--;
+    }
+
+    m_mutexNumWaiters.Unlock();
+}
+
+// ----------------------------------------------------------------------------
+// wxCondition implementation
+// ----------------------------------------------------------------------------
+
+wxCondition::wxCondition(wxMutex& mutex)
+{
+    m_internal = new wxConditionInternal( mutex );
+}
+
+wxCondition::~wxCondition()
 {
-  wxThread *ptr = (wxThread *)arg;
-  DWORD ret;
+    delete m_internal;
+}
 
-  ret = (DWORD)ptr->Entry();
-  ptr->p_internal->state = STATE_EXITED;
+void wxCondition::Wait()
+{
+    m_internal->Wait();
+}
 
-  return ret;
+bool wxCondition::Wait( unsigned long timeout_millis )
+{
+    return m_internal->Wait(timeout_millis);
 }
 
-wxThreadError wxThread::Create()
+void wxCondition::Signal()
 {
-  int win_prio, prio = p_internal->prio;
+    m_internal->Signal();
+}
 
-  p_internal->thread_id = CreateThread(NULL, 0,
-                   (LPTHREAD_START_ROUTINE)wxThreadInternal::WinThreadStart,
-                   (void *)this, CREATE_SUSPENDED, &p_internal->tid);
-  if (p_internal->thread_id == NULL) {
-    printf("Error = %d\n", GetLastError());
-    return THREAD_NO_RESOURCE;
-  }
+void wxCondition::Broadcast()
+{
+    m_internal->Broadcast();
+}
 
-  if (prio <= 20)
-    win_prio = THREAD_PRIORITY_LOWEST;
-  else if (prio <= 40)
-    win_prio = THREAD_PRIORITY_BELOW_NORMAL;
-  else if (prio <= 60)
-    win_prio = THREAD_PRIORITY_NORMAL;
-  else if (prio <= 80)
-    win_prio = THREAD_PRIORITY_ABOVE_NORMAL;
-  else if (prio <= 100)
-    win_prio = THREAD_PRIORITY_HIGHEST;
+// ----------------------------------------------------------------------------
+// wxCriticalSection implementation
+// ----------------------------------------------------------------------------
 
-  SetThreadPriority(p_internal->thread_id, win_prio);
+wxCriticalSection::wxCriticalSection()
+{
+#ifdef __WXDEBUG__
+    // Done this way to stop warnings during compilation about statement
+    // always being FALSE
+    int csSize = sizeof(CRITICAL_SECTION);
+    int bSize  = sizeof(m_buffer);
+    wxASSERT_MSG( csSize <= bSize,
+                  _T("must increase buffer size in wx/thread.h") );
+#endif
 
-  ResumeThread(p_internal->thread_id);
-  p_internal->state = STATE_RUNNING;
- 
-  return THREAD_NO_ERROR;
+    ::InitializeCriticalSection((CRITICAL_SECTION *)m_buffer);
 }
 
-wxThreadError wxThread::Destroy()
+wxCriticalSection::~wxCriticalSection()
 {
-  if (p_internal->state != STATE_RUNNING)
-    return THREAD_NOT_RUNNING;
+    ::DeleteCriticalSection((CRITICAL_SECTION *)m_buffer);
+}
 
-  if (p_internal->defer == FALSE)
-    TerminateThread(p_internal->thread_id, 0);
-  else
-    p_internal->state = STATE_CANCELED;
+void wxCriticalSection::Enter()
+{
+    ::EnterCriticalSection((CRITICAL_SECTION *)m_buffer);
+}
 
-  return THREAD_NO_ERROR;
+void wxCriticalSection::Leave()
+{
+    ::LeaveCriticalSection((CRITICAL_SECTION *)m_buffer);
 }
 
-void wxThread::Exit(void *status)
+// ----------------------------------------------------------------------------
+// wxThread implementation
+// ----------------------------------------------------------------------------
+
+// wxThreadInternal class
+// ----------------------
+
+class wxThreadInternal
+{
+public:
+    wxThreadInternal()
+    {
+        m_hThread = 0;
+        m_state = STATE_NEW;
+        m_priority = WXTHREAD_DEFAULT_PRIORITY;
+    }
+
+    ~wxThreadInternal()
+    {
+        Free();
+    }
+
+    void Free()
+    {
+        if ( m_hThread )
+        {
+            if ( !::CloseHandle(m_hThread) )
+            {
+                wxLogLastError(wxT("CloseHandle(thread)"));
+            }
+
+            m_hThread = 0;
+        }
+    }
+
+    // create a new (suspended) thread (for the given thread object)
+    bool Create(wxThread *thread, unsigned int stackSize);
+
+    // suspend/resume/terminate
+    bool Suspend();
+    bool Resume();
+    void Cancel() { m_state = STATE_CANCELED; }
+
+    // thread state
+    void SetState(wxThreadState state) { m_state = state; }
+    wxThreadState GetState() const { return m_state; }
+
+    // thread priority
+    void SetPriority(unsigned int priority);
+    unsigned int GetPriority() const { return m_priority; }
+
+    // thread handle and id
+    HANDLE GetHandle() const { return m_hThread; }
+    DWORD  GetId() const { return m_tid; }
+
+    // thread function
+    static THREAD_RETVAL THREAD_CALLCONV WinThreadStart(void *thread);
+
+private:
+    HANDLE        m_hThread;    // handle of the thread
+    wxThreadState m_state;      // state, see wxThreadState enum
+    unsigned int  m_priority;   // thread priority in "wx" units
+    DWORD         m_tid;        // thread id
+};
+
+THREAD_RETVAL THREAD_CALLCONV wxThreadInternal::WinThreadStart(void *param)
+{
+    THREAD_RETVAL rc;
+    bool wasCancelled;
+
+    // first of all, check whether we hadn't been cancelled already and don't
+    // start the user code at all then
+    wxThread *thread = (wxThread *)param;
+    if ( thread->m_internal->GetState() == STATE_EXITED )
+    {
+        rc = (THREAD_RETVAL)-1;
+        wasCancelled = TRUE;
+    }
+    else // do run thread
+    {
+        // store the thread object in the TLS
+        if ( !::TlsSetValue(gs_tlsThisThread, thread) )
+        {
+            wxLogSysError(_("Can not start thread: error writing TLS."));
+
+            return (DWORD)-1;
+        }
+
+        rc = (THREAD_RETVAL)thread->Entry();
+
+        // enter m_critsect before changing the thread state
+        thread->m_critsect.Enter();
+        wasCancelled = thread->m_internal->GetState() == STATE_CANCELED;
+        thread->m_internal->SetState(STATE_EXITED);
+        thread->m_critsect.Leave();
+    }
+
+    thread->OnExit();
+
+    // if the thread was cancelled (from Delete()), then its 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 rc;
+}
+
+void wxThreadInternal::SetPriority(unsigned int priority)
 {
-  p_internal->state = STATE_EXITED;
-  ExitThread((DWORD)status);
+    m_priority = priority;
+
+    // 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
+    {
+        wxFAIL_MSG(wxT("invalid value of thread priority parameter"));
+        win_priority = THREAD_PRIORITY_NORMAL;
+    }
+
+    if ( !::SetThreadPriority(m_hThread, win_priority) )
+    {
+        wxLogSysError(_("Can't set thread priority"));
+    }
 }
 
-void wxThread::SetPriority(int prio)
+bool wxThreadInternal::Create(wxThread *thread, unsigned int stackSize)
 {
-  p_internal->prio = prio;
+    // for compilers which have it, we should use C RTL function for thread
+    // creation instead of Win32 API one because otherwise we will have memory
+    // leaks if the thread uses C RTL (and most threads do)
+#ifdef wxUSE_BEGIN_THREAD
+
+    // Watcom is reported to not like 0 stack size (which means "use default"
+    // for the other compilers and is also the default value for stackSize)
+#ifdef __WATCOMC__
+    if ( !stackSize )
+        stackSize = 10240;
+#endif // __WATCOMC__
+
+    m_hThread = (HANDLE)_beginthreadex
+                        (
+                          NULL,                             // default security
+                          stackSize,
+                          wxThreadInternal::WinThreadStart, // entry point
+                          thread,
+                          CREATE_SUSPENDED,
+                          (unsigned int *)&m_tid
+                        );
+#else // compiler doesn't have _beginthreadex
+    m_hThread = ::CreateThread
+                  (
+                    NULL,                               // default security
+                    stackSize,                          // stack size
+                    wxThreadInternal::WinThreadStart,   // thread entry point
+                    (LPVOID)thread,                     // parameter
+                    CREATE_SUSPENDED,                   // flags
+                    &m_tid                              // [out] thread id
+                  );
+#endif // _beginthreadex/CreateThread
+
+    if ( m_hThread == NULL )
+    {
+        wxLogSysError(_("Can't create thread"));
+
+        return FALSE;
+    }
+
+    if ( m_priority != WXTHREAD_DEFAULT_PRIORITY )
+    {
+        SetPriority(m_priority);
+    }
+
+    return TRUE;
 }
 
-int wxThread::GetPriority()
+bool wxThreadInternal::Suspend()
 {
-  return p_internal->prio;
+    DWORD nSuspendCount = ::SuspendThread(m_hThread);
+    if ( nSuspendCount == (DWORD)-1 )
+    {
+        wxLogSysError(_("Can not suspend thread %x"), m_hThread);
+
+        return FALSE;
+    }
+
+    m_state = STATE_PAUSED;
+
+    return TRUE;
 }
 
-void wxThread::DeferDestroy(bool on)
+bool wxThreadInternal::Resume()
 {
-  p_internal->defer = on;
+    DWORD nSuspendCount = ::ResumeThread(m_hThread);
+    if ( nSuspendCount == (DWORD)-1 )
+    {
+        wxLogSysError(_("Can not resume thread %x"), 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_state != STATE_EXITED )
+    {
+        m_state = STATE_RUNNING;
+    }
+
+    return TRUE;
 }
 
-void wxThread::TestDestroy()
+// static functions
+// ----------------
+
+wxThread *wxThread::This()
 {
-  if (p_internal->state == STATE_CANCELED)
-    ExitThread(0);
+    wxThread *thread = (wxThread *)::TlsGetValue(gs_tlsThisThread);
+
+    // be careful, 0 may be a valid return value as well
+    if ( !thread && (::GetLastError() != NO_ERROR) )
+    {
+        wxLogSysError(_("Couldn't get the current thread pointer"));
+
+        // return NULL...
+    }
+
+    return thread;
 }
 
-void *wxThread::Join()
+bool wxThread::IsMain()
 {
-  DWORD exit_code;
+    return ::GetCurrentThreadId() == gs_idMainThread;
+}
 
-  if (p_internal->state == STATE_IDLE)
-    return NULL;
+#ifdef Yield
+#undef Yield
+#endif
 
-  if (wxThread::IsMain())
-    wxMainMutex.Unlock();
-  WaitForSingleObject(p_internal->thread_id, INFINITE);
-  if (wxThread::IsMain())
-    wxMainMutex.Lock();
+void wxThread::Yield()
+{
+    // 0 argument to Sleep() is special and means to just give away the rest of
+    // our timeslice
+    ::Sleep(0);
+}
 
-  GetExitCodeThread(p_internal->thread_id, &exit_code);
-  CloseHandle(p_internal->thread_id);
+void wxThread::Sleep(unsigned long milliseconds)
+{
+    ::Sleep(milliseconds);
+}
 
-  p_internal->state = STATE_IDLE;
+int wxThread::GetCPUCount()
+{
+    SYSTEM_INFO si;
+    GetSystemInfo(&si);
 
-  return (void *)exit_code;
+    return si.dwNumberOfProcessors;
 }
 
-unsigned long wxThread::GetID() const
+unsigned long wxThread::GetCurrentId()
 {
-  return (unsigned long)p_internal->tid;
+    return (unsigned long)::GetCurrentThreadId();
 }
 
-bool wxThread::IsMain() const
+bool wxThread::SetConcurrency(size_t level)
 {
-  return (GetCurrentThread() == p_mainid);
+    wxASSERT_MSG( IsMain(), _T("should only be called from the main thread") );
+
+    // ok only for the default one
+    if ( level == 0 )
+        return 0;
+
+    // get system affinity mask first
+    HANDLE hProcess = ::GetCurrentProcess();
+    DWORD dwProcMask, dwSysMask;
+    if ( ::GetProcessAffinityMask(hProcess, &dwProcMask, &dwSysMask) == 0 )
+    {
+        wxLogLastError(_T("GetProcessAffinityMask"));
+
+        return FALSE;
+    }
+
+    // how many CPUs have we got?
+    if ( dwSysMask == 1 )
+    {
+        // don't bother with all this complicated stuff - on a single
+        // processor system it doesn't make much sense anyhow
+        return level == 1;
+    }
+
+    // calculate the process mask: it's a bit vector with one bit per
+    // processor; we want to schedule the process to run on first level
+    // CPUs
+    DWORD bit = 1;
+    while ( bit )
+    {
+        if ( dwSysMask & bit )
+        {
+            // ok, we can set this bit
+            dwProcMask |= bit;
+
+            // another process added
+            if ( !--level )
+            {
+                // and that's enough
+                break;
+            }
+        }
+
+        // next bit
+        bit <<= 1;
+    }
+
+    // could we set all bits?
+    if ( level != 0 )
+    {
+        wxLogDebug(_T("bad level %u in wxThread::SetConcurrency()"), level);
+
+        return FALSE;
+    }
+
+    // set it: we can't link to SetProcessAffinityMask() because it doesn't
+    // exist in Win9x, use RT binding instead
+
+    typedef BOOL (*SETPROCESSAFFINITYMASK)(HANDLE, DWORD);
+
+    // can use static var because we're always in the main thread here
+    static SETPROCESSAFFINITYMASK pfnSetProcessAffinityMask = NULL;
+
+    if ( !pfnSetProcessAffinityMask )
+    {
+        HMODULE hModKernel = ::LoadLibrary(_T("kernel32"));
+        if ( hModKernel )
+        {
+            pfnSetProcessAffinityMask = (SETPROCESSAFFINITYMASK)
+                ::GetProcAddress(hModKernel, "SetProcessAffinityMask");
+        }
+
+        // we've discovered a MT version of Win9x!
+        wxASSERT_MSG( pfnSetProcessAffinityMask,
+                      _T("this system has several CPUs but no SetProcessAffinityMask function?") );
+    }
+
+    if ( !pfnSetProcessAffinityMask )
+    {
+        // msg given above - do it only once
+        return FALSE;
+    }
+
+    if ( pfnSetProcessAffinityMask(hProcess, dwProcMask) == 0 )
+    {
+        wxLogLastError(_T("SetProcessAffinityMask"));
+
+        return FALSE;
+    }
+
+    return TRUE;
 }
 
-wxThread::wxThread()
+// ctor and dtor
+// -------------
+
+wxThread::wxThread(wxThreadKind kind)
 {
-  p_internal = new wxThreadInternal();
+    m_internal = new wxThreadInternal();
 
-  p_internal->defer = FALSE;
-  p_internal->prio  = WXTHREAD_DEFAULT_PRIORITY;
-  p_internal->state = STATE_IDLE;
+    m_isDetached = kind == wxTHREAD_DETACHED;
 }
 
 wxThread::~wxThread()
 {
-  Destroy();
-  Join();
-  delete p_internal;
+    delete m_internal;
+}
+
+// create/start thread
+// -------------------
+
+wxThreadError wxThread::Create(unsigned int stackSize)
+{
+    wxCriticalSectionLocker lock(m_critsect);
+
+    if ( !m_internal->Create(this, stackSize) )
+        return wxTHREAD_NO_RESOURCE;
+
+    return wxTHREAD_NO_ERROR;
 }
 
-// The default callback just joins the thread and throws away the result.
-void wxThread::OnExit()
+wxThreadError wxThread::Run()
 {
-  Join();
+    wxCriticalSectionLocker lock(m_critsect);
+
+    if ( m_internal->GetState() != STATE_NEW )
+    {
+        // 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();
 }
 
-// Automatic initialization
-class wxThreadModule : public wxModule {
-  DECLARE_DYNAMIC_CLASS(wxThreadModule)
+// suspend/resume thread
+// ---------------------
+
+wxThreadError wxThread::Pause()
+{
+    wxCriticalSectionLocker lock(m_critsect);
+
+    return m_internal->Suspend() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
+}
+
+wxThreadError wxThread::Resume()
+{
+    wxCriticalSectionLocker lock(m_critsect);
+
+    return m_internal->Resume() ? wxTHREAD_NO_ERROR : wxTHREAD_MISC_ERROR;
+}
+
+// stopping thread
+// ---------------
+
+wxThread::ExitCode wxThread::Wait()
+{
+    // 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);
+
+    m_internal->Free();
+
+    return rc;
+}
+
+wxThreadError wxThread::Delete(ExitCode *pRc)
+{
+    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(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();
+
+    HANDLE hThread = m_internal->GetHandle();
+
+    // does is still run?
+    if ( isRunning || IsRunning() )
+    {
+        if ( IsMain() )
+        {
+            // set flag for wxIsWaitingForThread()
+            gs_waitingForThread = TRUE;
+
+#if wxUSE_GUI
+            wxBeginBusyCursor();
+#endif // wxUSE_GUI
+        }
+
+        // ask the thread to terminate
+        if ( shouldCancel )
+        {
+            wxCriticalSectionLocker lock(m_critsect);
+
+            m_internal->Cancel();
+        }
+
+#if wxUSE_GUI
+        // 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
+        {
+            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 wxTHREAD_KILLED;
+
+                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 wxTHREAD_KILLED;
+                    }
+
+                    if ( IsMain() )
+                    {
+                        // give the thread we're waiting for chance to exit
+                        // from the GUI call it might have been in
+                        if ( (gs_nWaitingForGui > 0) && wxGuiOwnedByMainThread() )
+                        {
+                            wxMutexGuiLeave();
+                        }
+                    }
+
+                    break;
+
+                default:
+                    wxFAIL_MSG(wxT("unexpected result of MsgWaitForMultipleObject"));
+            }
+        } while ( result != WAIT_OBJECT_0 );
+#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 ( WaitForSingleObject(hThread, INFINITE) != WAIT_OBJECT_0 )
+        {
+            wxFAIL_MSG(wxT("unexpected result of WaitForSingleObject"));
+        }
+#endif // wxUSE_GUI/!wxUSE_GUI
+
+        if ( IsMain() )
+        {
+            gs_waitingForThread = FALSE;
+
+#if wxUSE_GUI
+            wxEndBusyCursor();
+#endif // wxUSE_GUI
+        }
+    }
+
+    // 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 );
+
+    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;
+}
+
+wxThreadError wxThread::Kill()
+{
+    if ( !IsRunning() )
+        return wxTHREAD_NOT_RUNNING;
+
+    if ( !::TerminateThread(m_internal->GetHandle(), (DWORD)-1) )
+    {
+        wxLogSysError(_("Couldn't terminate thread"));
+
+        return wxTHREAD_MISC_ERROR;
+    }
+
+    m_internal->Free();
+
+    if ( IsDetached() )
+    {
+        delete this;
+    }
+
+    return wxTHREAD_NO_ERROR;
+}
+
+void wxThread::Exit(ExitCode status)
+{
+    m_internal->Free();
+
+    if ( IsDetached() )
+    {
+        delete this;
+    }
+
+#ifdef wxUSE_BEGIN_THREAD
+    _endthreadex((unsigned)status);
+#else // !VC++
+    ::ExitThread((DWORD)status);
+#endif // VC++/!VC++
+
+    wxFAIL_MSG(wxT("Couldn't return from ExitThread()!"));
+}
+
+// priority setting
+// ----------------
+
+void wxThread::SetPriority(unsigned int prio)
+{
+    wxCriticalSectionLocker lock(m_critsect);
+
+    m_internal->SetPriority(prio);
+}
+
+unsigned int wxThread::GetPriority() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+    return m_internal->GetPriority();
+}
+
+unsigned long wxThread::GetId() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+    return (unsigned long)m_internal->GetId();
+}
+
+bool wxThread::IsRunning() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+    return m_internal->GetState() == STATE_RUNNING;
+}
+
+bool wxThread::IsAlive() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+    return (m_internal->GetState() == STATE_RUNNING) ||
+           (m_internal->GetState() == STATE_PAUSED);
+}
+
+bool wxThread::IsPaused() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+    return m_internal->GetState() == STATE_PAUSED;
+}
+
+bool wxThread::TestDestroy()
+{
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect); // const_cast
+
+    return m_internal->GetState() == STATE_CANCELED;
+}
+
+// ----------------------------------------------------------------------------
+// Automatic initialization for thread module
+// ----------------------------------------------------------------------------
+
+class wxThreadModule : public wxModule
+{
 public:
-  virtual bool OnInit() {
-    p_mainid = GetCurrentThread();
-    wxMainMutex.Lock();
-    return TRUE;
-  }
+    virtual bool OnInit();
+    virtual void OnExit();
 
-  // Global cleanup
-  virtual void OnExit() {
-    wxMainMutex.Unlock();
-  }
+private:
+    DECLARE_DYNAMIC_CLASS(wxThreadModule)
 };
 
 IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
 
+bool wxThreadModule::OnInit()
+{
+    // allocate TLS index for storing the pointer to the current thread
+    gs_tlsThisThread = ::TlsAlloc();
+    if ( gs_tlsThisThread == 0xFFFFFFFF )
+    {
+        // 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;
+    }
+
+    // main thread doesn't have associated wxThread object, so store 0 in the
+    // TLS instead
+    if ( !::TlsSetValue(gs_tlsThisThread, (LPVOID)0) )
+    {
+        ::TlsFree(gs_tlsThisThread);
+        gs_tlsThisThread = 0xFFFFFFFF;
+
+        wxLogSysError(_("Thread module initialization failed: can not store value in thread local storage"));
+
+        return FALSE;
+    }
+
+    gs_critsectWaitingForGui = new wxCriticalSection();
+
+    gs_critsectGui = new wxCriticalSection();
+    gs_critsectGui->Enter();
+
+    // no error return for GetCurrentThreadId()
+    gs_idMainThread = ::GetCurrentThreadId();
+
+    return TRUE;
+}
+
+void wxThreadModule::OnExit()
+{
+    if ( !::TlsFree(gs_tlsThisThread) )
+    {
+        wxLogLastError(wxT("TlsFree failed."));
+    }
+
+    if ( gs_critsectGui )
+    {
+        gs_critsectGui->Leave();
+        delete gs_critsectGui;
+        gs_critsectGui = NULL;
+    }
+
+    delete gs_critsectWaitingForGui;
+    gs_critsectWaitingForGui = NULL;
+}
+
+// ----------------------------------------------------------------------------
+// under Windows, these functions are implemented using a critical section and
+// not a mutex, so the names are a bit confusing
+// ----------------------------------------------------------------------------
+
+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_critsectWaitingForGui);
+
+        gs_nWaitingForGui++;
+    }
+
+    wxWakeUpMainThread();
+
+    // now we may block here because the main thread will soon let us in
+    // (during the next iteration of OnIdle())
+    gs_critsectGui->Enter();
+}
+
+void WXDLLEXPORT wxMutexGuiLeave()
+{
+    wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
+
+    if ( wxThread::IsMain() )
+    {
+        gs_bGuiOwnedByMainThread = FALSE;
+    }
+    else
+    {
+        // decrement the number of threads waiting for GUI access now
+        wxASSERT_MSG( gs_nWaitingForGui > 0,
+                      wxT("calling wxMutexGuiLeave() without entering it first?") );
+
+        gs_nWaitingForGui--;
+
+        wxWakeUpMainThread();
+    }
+
+    gs_critsectGui->Leave();
+}
+
+void WXDLLEXPORT wxMutexGuiLeaveOrEnter()
+{
+    wxASSERT_MSG( wxThread::IsMain(),
+                  wxT("only main thread may call wxMutexGuiLeaveOrEnter()!") );
+
+    wxCriticalSectionLocker enter(*gs_critsectWaitingForGui);
+
+    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_critsectGui->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;
+}
+
+// wake up the main thread if it's in ::GetMessage()
+void WXDLLEXPORT wxWakeUpMainThread()
+{
+    // sending any message would do - hopefully WM_NULL is harmless enough
+    if ( !::PostThreadMessage(gs_idMainThread, WM_NULL, 0, 0) )
+    {
+        // should never happen
+        wxLogLastError(wxT("PostThreadMessage(WM_NULL)"));
+    }
+}
+
+bool WXDLLEXPORT wxIsWaitingForThread()
+{
+    return gs_waitingForThread;
+}
+
+#endif // wxUSE_THREADS
+
+// vi:sts=4:sw=4:et