some != NULL checks

[wxWidgets.git] / src / gtk / threadpsx.cpp

diff --git a/src/gtk/threadpsx.cpp b/src/gtk/threadpsx.cpp
index f6ffab19b9c7213fd7010e6f2a175924d7e51a27..99239908efc0c7c164e796b5abffa6d06ebb9bfa 100644 (file)
--- a/src/gtk/threadpsx.cpp
+++ b/src/gtk/threadpsx.cpp
@@ -5,317 +5,754 @@
 // Modified by:
 // Created:     04/22/98
 // RCS-ID:      $Id$
 // Modified by:
 // 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)
+//                  Robert Roebling (1999)

 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////
 // Licence:     wxWindows licence
 /////////////////////////////////////////////////////////////////////////////

+

 #ifdef __GNUG__
 #ifdef __GNUG__

-#pragma implementation "thread.h"
+    #pragma implementation "thread.h"

 #endif
 
 #include <stdio.h>
 #include <unistd.h>
 #endif
 
 #include <stdio.h>
 #include <unistd.h>

-#include <sched.h>

 #include <pthread.h>
 #include <pthread.h>

+#include <errno.h>

 
 

-enum thread_state {
-  STATE_IDLE = 0,
-  STATE_RUNNING,
-  STATE_CANCELED,
-  STATE_EXITED
-};
+#ifdef __linux__
+    #include <sched.h>
+#endif
+
+#ifdef __SUN__
+extern int usleep(unsigned int useconds);
+#endif

 
 

-/////////////////////////////////////////////////////////////////////////////
-// Static variables
-/////////////////////////////////////////////////////////////////////////////

 
 #include "wx/thread.h"
 
 #include "wx/thread.h"

+#include "wx/module.h"
+#include "wx/utils.h"
+#include "wx/log.h"
+#include "wx/intl.h"
+#include "wx/dynarray.h"

 
 

-static pthread_t p_mainid;
-wxMutex wxMainMutex; // controls access to all GUI functions
+#include "gdk/gdk.h"
+#include "gtk/gtk.h"
+
+enum thread_state
+{
+    STATE_NEW,          // didn't start execution yet (=> RUNNING)
+    STATE_RUNNING,
+    STATE_PAUSED,
+    STATE_CANCELED,
+    STATE_EXITED
+};
+
+WX_DEFINE_ARRAY(wxThread *, wxArrayThread);
+
+// -----------------------------------------------------------------------------
+// global data
+// -----------------------------------------------------------------------------
+
+// we keep the list of all threads created by the application to be able to
+// terminate them on exit if there are some left - otherwise the process would
+// be left in memory
+static wxArrayThread gs_allThreads;
+
+// the id of the main thread
+static pthread_t gs_tidMain;
+
+// the key for the pointer to the associated wxThread object
+static pthread_key_t gs_keySelf;
+
+// this mutex must be acquired before any call to a GUI function
+static wxMutex *gs_mutexGui;
+
+//--------------------------------------------------------------------
+// common GUI thread code
+//--------------------------------------------------------------------

 
 

-/////////////////////////////////////////////////////////////////////////////
-// GUI thread manager
-/////////////////////////////////////////////////////////////////////////////

 #include "threadgui.inc"
 
 #include "threadgui.inc"
 

-/////////////////////////////////////////////////////////////////////////////
-// wxThread: Posix Thread implementation (Mutex)
-/////////////////////////////////////////////////////////////////////////////
+//--------------------------------------------------------------------
+// wxMutex (Posix implementation)
+//--------------------------------------------------------------------

 
 

-class wxMutexInternal {
+class wxMutexInternal
+{

 public:
   pthread_mutex_t p_mutex;
 };
 
 wxMutex::wxMutex()
 {
 public:
   pthread_mutex_t p_mutex;
 };
 
 wxMutex::wxMutex()
 {

-  p_internal = new wxMutexInternal;
-  pthread_mutex_init(&(p_internal->p_mutex), NULL);
-  m_locked = 0;
+    p_internal = new wxMutexInternal;
+    pthread_mutex_init( &(p_internal->p_mutex), (const pthread_mutexattr_t*) NULL );
+    m_locked = 0;

 }
 
 wxMutex::~wxMutex()
 {
 }
 
 wxMutex::~wxMutex()
 {

-  if (m_locked > 0)
-    wxDebugMsg("wxMutex warning: freeing a locked mutex (%d locks)\n",
-               m_locked);
+    if (m_locked > 0)
+        wxLogDebug("Freeing a locked mutex (%d locks)", m_locked);

 
 

-  pthread_mutex_destroy(&(p_internal->p_mutex));
-  delete p_internal;
+    pthread_mutex_destroy( &(p_internal->p_mutex) );
+    delete p_internal;

 }
 
 wxMutexError wxMutex::Lock()
 {
 }
 
 wxMutexError wxMutex::Lock()
 {

-  int err;
+    int err = pthread_mutex_lock( &(p_internal->p_mutex) );
+    if (err == EDEADLK)
+    {
+        wxLogDebug("Locking this mutex would lead to deadlock!");
+
+        return wxMUTEX_DEAD_LOCK;
+    }

 
 

-  err = pthread_mutex_lock(&(p_internal->p_mutex));
-  if (err == EDEADLK)
-    return MUTEX_DEAD_LOCK;
-  m_locked++;
-  return MUTEX_NO_ERROR;
+    m_locked++;
+
+    return wxMUTEX_NO_ERROR;

 }
 
 wxMutexError wxMutex::TryLock()
 {
 }
 
 wxMutexError wxMutex::TryLock()
 {

-  int err;
+    if (m_locked)
+    {
+        return wxMUTEX_BUSY;
+    }
+
+    int err = pthread_mutex_trylock( &(p_internal->p_mutex) );
+    switch (err)
+    {
+        case EBUSY: return wxMUTEX_BUSY;
+    }

 
 

-  if (m_locked)
-    return MUTEX_BUSY;
-  err = pthread_mutex_trylock(&(p_internal->p_mutex));
-  switch (err) {
-  case EBUSY: return MUTEX_BUSY;
-  }
-  m_locked++;
-  return MUTEX_NO_ERROR;
+    m_locked++;
+
+    return wxMUTEX_NO_ERROR;

 }
 
 wxMutexError wxMutex::Unlock()
 {
 }
 
 wxMutexError wxMutex::Unlock()
 {

-  if (m_locked > 0)
-    m_locked--;
-  else
-    return MUTEX_UNLOCKED;
-  pthread_mutex_unlock(&(p_internal->p_mutex));
-  return MUTEX_NO_ERROR;
+    if (m_locked > 0)
+    {
+        m_locked--;
+    }
+    else
+    {
+        wxLogDebug("Unlocking not locked mutex.");
+
+        return wxMUTEX_UNLOCKED;
+    }
+
+    pthread_mutex_unlock( &(p_internal->p_mutex) );
+
+    return wxMUTEX_NO_ERROR;

 }
 
 }
 

-/////////////////////////////////////////////////////////////////////////////
-// wxThread: Posix Thread implementation (Condition)
-/////////////////////////////////////////////////////////////////////////////
+//--------------------------------------------------------------------
+// wxCondition (Posix implementation)
+//--------------------------------------------------------------------

 
 

-class wxConditionInternal {
+class wxConditionInternal
+{

 public:
   pthread_cond_t p_condition;
 };
 
 wxCondition::wxCondition()
 {
 public:
   pthread_cond_t p_condition;
 };
 
 wxCondition::wxCondition()
 {

-  p_internal = new wxConditionInternal;
-  pthread_cond_init(&(p_internal->p_condition), NULL);
+    p_internal = new wxConditionInternal;
+    pthread_cond_init( &(p_internal->p_condition), (const pthread_condattr_t *) NULL );

 }
 
 wxCondition::~wxCondition()
 {
 }
 
 wxCondition::~wxCondition()
 {

-  pthread_cond_destroy(&(p_internal->p_condition));
-  delete p_internal;
+    pthread_cond_destroy( &(p_internal->p_condition) );
+
+    delete p_internal;

 }
 
 void wxCondition::Wait(wxMutex& mutex)
 {
 }
 
 void wxCondition::Wait(wxMutex& mutex)
 {

-  pthread_cond_wait(&(p_internal->p_condition), &(mutex.p_internal->p_mutex));
+    pthread_cond_wait( &(p_internal->p_condition), &(mutex.p_internal->p_mutex) );

 }
 
 bool wxCondition::Wait(wxMutex& mutex, unsigned long sec, unsigned long nsec)
 {
 }
 
 bool wxCondition::Wait(wxMutex& mutex, unsigned long sec, unsigned long nsec)
 {

-  struct timespec tspec;
+    struct timespec tspec;

 
 

-  tspec.tv_sec = time(NULL)+sec;
-  tspec.tv_nsec = nsec;
-  return (pthread_cond_timedwait(&(p_internal->p_condition), &(mutex.p_internal->p_mutex), &tspec) != ETIMEDOUT);
+    tspec.tv_sec = time(0L)+sec;
+    tspec.tv_nsec = nsec;
+    return (pthread_cond_timedwait(&(p_internal->p_condition), &(mutex.p_internal->p_mutex), &tspec) != ETIMEDOUT);

 }
 
 void wxCondition::Signal()
 {
 }
 
 void wxCondition::Signal()
 {

-  pthread_cond_signal(&(p_internal->p_condition));
+    pthread_cond_signal( &(p_internal->p_condition) );

 }
 
 void wxCondition::Broadcast()
 {
 }
 
 void wxCondition::Broadcast()
 {

-  pthread_cond_broadcast(&(p_internal->p_condition));
+    pthread_cond_broadcast( &(p_internal->p_condition) );

 }
 
 }
 

-/////////////////////////////////////////////////////////////////////////////
-// wxThread: Posix Thread implementation (Thread)
-/////////////////////////////////////////////////////////////////////////////
+//--------------------------------------------------------------------
+// wxThread (Posix implementation)
+//--------------------------------------------------------------------

 
 

-class wxThreadInternal {
+class wxThreadInternal
+{

 public:
 public:

-  wxThreadInternal() { state = STATE_IDLE; }
-  ~wxThreadInternal() {}
-  static void *PthreadStart(void *ptr);
-  pthread_t thread_id;
-  int state;
-  int prio;
+    wxThreadInternal();
+    ~wxThreadInternal();
+
+    // thread entry function
+    static void *PthreadStart(void *ptr);
+
+    // thread actions
+        // start the thread
+    wxThreadError Run();
+        // ask the thread to terminate
+    void Cancel();
+        // wake up threads waiting for our termination
+    void SignalExit();
+        // go to sleep until Resume() is called
+    void Pause();
+        // resume the thread
+    void Resume();
+
+    // accessors
+        // priority
+    int GetPriority() const { return m_prio; }
+    void SetPriority(int prio) { m_prio = prio; }
+        // state
+    thread_state GetState() const { return m_state; }
+    void SetState(thread_state state) { m_state = state; }
+        // id
+    pthread_t GetId() const { return thread_id; }
+        // "cancelled" flag
+    bool WasCancelled() const { return m_cancelled; }
+
+//private: -- should be!
+    pthread_t thread_id;
+
+private:
+    thread_state m_state;    // see thread_state enum
+    int          m_prio;     // in wxWindows units: from 0 to 100
+
+    // set when the thread should terminate
+    bool m_cancelled;
+
+    // this (mutex, cond) pair is used to synchronize the main thread and this
+    // thread in several situations:
+    //  1. The thread function blocks until condition is signaled by Run() when
+    //     it's initially created - this allows create thread in "suspended"
+    //     state
+    //  2. The Delete() function blocks until the condition is signaled when the
+    //     thread exits.
+    wxMutex     m_mutex;
+    wxCondition m_cond;
+
+    // another (mutex, cond) pair for Pause()/Resume() usage
+    //
+    // VZ: it's possible that we might reuse the mutex and condition from above
+    //     for this too, but as I'm not at all sure that it won't create subtle
+    //     problems with race conditions between, say, Pause() and Delete() I
+    //     prefer this may be a bit less efficient but much safer solution
+    wxMutex     m_mutexSuspend;
+    wxCondition m_condSuspend;

 };
 
 void *wxThreadInternal::PthreadStart(void *ptr)
 {
 };
 
 void *wxThreadInternal::PthreadStart(void *ptr)
 {

-  wxThread *thread = (wxThread *)ptr;
+    wxThread *thread = (wxThread *)ptr;
+    wxThreadInternal *pthread = thread->p_internal;

 
 

-  pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
-  void* status = thread->Entry();
-  thread->Exit(status);
+    if ( pthread_setspecific(gs_keySelf, thread) != 0 )
+    {
+        wxLogError(_("Can not start thread: error writing TLS."));

 
 

-  return NULL;
+        return (void *)-1;
+    }
+
+    // wait for the condition to be signaled from Run()
+    // mutex state: currently locked by the thread which created us
+    pthread->m_cond.Wait(pthread->m_mutex);
+
+    // mutex state: locked again on exit of Wait()
+
+    // call the main entry
+    void* status = thread->Entry();
+
+    // terminate the thread
+    thread->Exit(status);
+
+    wxFAIL_MSG("wxThread::Exit() can't return.");
+
+    return NULL;

 }
 
 }
 

-wxThreadError wxThread::Create()
+wxThreadInternal::wxThreadInternal()
+{
+    m_state = STATE_NEW;
+    m_cancelled = FALSE;
+
+    // this mutex is locked during almost all thread lifetime - it will only be
+    // unlocked in the very end
+    m_mutex.Lock();
+
+    // this mutex is used in Pause()/Resume() and is also locked all the time
+    // unless the thread is paused
+    m_mutexSuspend.Lock();
+}
+
+wxThreadInternal::~wxThreadInternal()

 {
 {

-  pthread_attr_t a;
-  int min_prio, max_prio, p;
-  struct sched_param sp;
+    m_mutexSuspend.Unlock();

 
 

-  if (p_internal->state != STATE_IDLE)
-    return THREAD_RUNNING;
+    // note that m_mutex will be unlocked by the thread which waits for our
+    // termination
+}

 
 

-  // Change thread priority
-  pthread_attr_init(&a);
-  pthread_attr_getschedpolicy(&a, &p);
+wxThreadError wxThreadInternal::Run()
+{
+    wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING,
+                 "thread may only be started once after successful Create()" );

 
 

-  min_prio = sched_get_priority_min(p);
-  max_prio = sched_get_priority_max(p);
+    // the mutex was locked on Create(), so we will be able to lock it again
+    // only when the thread really starts executing and enters the wait -
+    // otherwise we might signal the condition before anybody is waiting for it
+    wxMutexLocker lock(m_mutex);
+    m_cond.Signal();

 
 

-  pthread_attr_getschedparam(&a, &sp);
-  sp.sched_priority = min_prio +
-               (p_internal->prio*(max_prio-min_prio))/100;
-  pthread_attr_setschedparam(&a, &sp);
+    m_state = STATE_RUNNING;

 
 

-  // this is the point of no return
-  p_internal->state = STATE_RUNNING;
-  if (pthread_create(&p_internal->thread_id, &a,
-                     wxThreadInternal::PthreadStart, (void *)this) != 0) {
-    p_internal->state = STATE_IDLE;
-    pthread_attr_destroy(&a);
-    return THREAD_NO_RESOURCE;
-  }
-  pthread_attr_destroy(&a);
-  return THREAD_NO_ERROR;
+    return wxTHREAD_NO_ERROR;
+
+    // now the mutex is unlocked back - but just to allow Wait() function to
+    // terminate by relocking it, so the net result is that the worker thread
+    // starts executing and the mutex is still locked
+}
+
+void wxThreadInternal::Cancel()
+{
+    // if the thread we're waiting for is waiting for the GUI mutex, we will
+    // deadlock so make sure we release it temporarily
+    if ( wxThread::IsMain() )
+        wxMutexGuiLeave();
+
+    // nobody ever writes this variable so it's safe to not use any
+    // synchronization here
+    m_cancelled = TRUE;
+
+    // entering Wait() releases the mutex thus allowing SignalExit() to acquire
+    // it and to signal us its termination
+    m_cond.Wait(m_mutex);
+
+    // mutex is still in the locked state - relocked on exit from Wait(), so
+    // unlock it - we don't need it any more, the thread has already terminated
+    m_mutex.Unlock();
+
+    // reacquire GUI mutex
+    if ( wxThread::IsMain() )
+        wxMutexGuiEnter();

 }
 
 }
 

-void wxThread::SetPriority(int prio)
+void wxThreadInternal::SignalExit()

 {
 {

-  if (p_internal->state == STATE_RUNNING)
-    return;
+    // as mutex is currently locked, this will block until some other thread
+    // (normally the same which created this one) unlocks it by entering Wait()
+    m_mutex.Lock();

 
 

-  if (prio > 100)
-    prio = 100;
-  if (prio < 0)
-    prio = 0;
-  p_internal->prio = prio;
+    // wake up all the threads waiting for our termination
+    m_cond.Broadcast();
+
+    // after this call mutex will be finally unlocked
+    m_mutex.Unlock();

 }
 
 }
 

-int wxThread::GetPriority() const
+void wxThreadInternal::Pause()

 {
 {

-  return p_internal->prio;
+    wxCHECK_RET( m_state == STATE_PAUSED,
+                 "thread must first be paused with wxThread::Pause()." );
+
+    // wait until the condition is signaled from Resume()
+    m_condSuspend.Wait(m_mutexSuspend);

 }
 
 }
 

-void wxThread::DeferDestroy(bool on)
+void wxThreadInternal::Resume()

 {
 {

-  if (on)
-    pthread_setcanceltype(PTHREAD_CANCEL_DEFERRED, NULL);
-  else
-    pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
+    wxCHECK_RET( m_state == STATE_PAUSED,
+                 "can't resume thread which is not suspended." );
+
+    // we will be able to lock this mutex only when Pause() starts waiting
+    wxMutexLocker lock(m_mutexSuspend);
+    m_condSuspend.Signal();
+
+    SetState(STATE_RUNNING);

 }
 
 }
 

-wxThreadError wxThread::Destroy()
+// -----------------------------------------------------------------------------
+// static functions
+// -----------------------------------------------------------------------------
+
+wxThread *wxThread::This()

 {
 {

-  int res = 0;
+    return (wxThread *)pthread_getspecific(gs_keySelf);
+}

 
 

-  if (p_internal->state == STATE_RUNNING) {
-    res = pthread_cancel(p_internal->thread_id);
-    if (res == 0)
-      p_internal->state = STATE_CANCELED;
-  }
-  return THREAD_NO_ERROR;
+bool wxThread::IsMain()
+{
+    return (bool)pthread_equal(pthread_self(), gs_tidMain);

 }
 
 }
 

-void *wxThread::Join()
+void wxThread::Yield()

 {
 {

-  void* status = 0;
+#ifdef HAVE_SCHED_YIELD
+    sched_yield();
+#else // !HAVE_SCHED_YIELD
+    // may be it will have the desired effect?
+    Sleep(0);
+#endif // HAVE_SCHED_YIELD
+}

 
 

-  if (p_internal->state != STATE_IDLE) {
-    bool do_unlock = wxThread::IsMain();
+void wxThread::Sleep(unsigned long milliseconds)
+{
+    wxUsleep(milliseconds);
+}

 
 

-    while (p_internal->state == STATE_RUNNING)
-      wxYield();
+// -----------------------------------------------------------------------------
+// creating thread
+// -----------------------------------------------------------------------------
+
+wxThread::wxThread()
+{
+    // add this thread to the global list of all threads
+    gs_allThreads.Add(this);

 
 

-    if (do_unlock)
-      wxMainMutex.Unlock();
-    pthread_join(p_internal->thread_id, &status);
-    if (do_unlock)
-      wxMainMutex.Lock();
-    p_internal->state = STATE_IDLE;
-  }
-  return status;
+    p_internal = new wxThreadInternal();
+}
+
+wxThreadError wxThread::Create()
+{
+    if (p_internal->GetState() != STATE_NEW)
+        return wxTHREAD_RUNNING;
+
+    // set up the thread attribute: right now, we only set thread priority
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+
+#ifdef HAVE_THREAD_PRIORITY_FUNCTIONS
+    int prio;
+    if ( pthread_attr_getschedpolicy(&attr, &prio) != 0 )
+    {
+        wxLogError(_("Can not retrieve thread scheduling policy."));
+    }
+
+    int min_prio = sched_get_priority_min(prio),
+        max_prio = sched_get_priority_max(prio);
+
+    if ( min_prio == -1 || max_prio == -1 )
+    {
+        wxLogError(_("Can not get priority range for scheduling policy %d."),
+                   prio);
+    }
+    else
+    {
+        struct sched_param sp;
+        pthread_attr_getschedparam(&attr, &sp);
+        sp.sched_priority = min_prio +
+                           (p_internal->GetPriority()*(max_prio-min_prio))/100;
+        pthread_attr_setschedparam(&attr, &sp);
+    }
+#endif // HAVE_THREAD_PRIORITY_FUNCTIONS
+
+    // create the new OS thread object
+    int rc = pthread_create(&p_internal->thread_id, &attr,
+                            wxThreadInternal::PthreadStart, (void *)this);
+    pthread_attr_destroy(&attr);
+
+    if ( rc != 0 )
+    {
+        p_internal->SetState(STATE_EXITED);
+        return wxTHREAD_NO_RESOURCE;
+    }
+
+    return wxTHREAD_NO_ERROR;
+}
+
+wxThreadError wxThread::Run()
+{
+    return p_internal->Run();
+}
+
+// -----------------------------------------------------------------------------
+// misc accessors
+// -----------------------------------------------------------------------------
+
+void wxThread::SetPriority(unsigned int prio)
+{
+    wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) &&
+                 ((int)prio <= (int)WXTHREAD_MAX_PRIORITY),
+                 "invalid thread priority" );
+
+    wxCriticalSectionLocker lock(m_critsect);
+
+    switch ( p_internal->GetState() )
+    {
+        case STATE_NEW:
+            // thread not yet started, priority will be set when it is
+            p_internal->SetPriority(prio);
+            break;
+
+        case STATE_RUNNING:
+        case STATE_PAUSED:
+#ifdef HAVE_THREAD_PRIORITY_FUNCTIONS
+            {
+                struct sched_param sparam;
+                sparam.sched_priority = prio;
+
+                if ( pthread_setschedparam(p_internal->GetId(),
+                                           SCHED_OTHER, &sparam) != 0 )
+                {
+                    wxLogError(_("Failed to set thread priority %d."), prio);
+                }
+            }
+#endif // HAVE_THREAD_PRIORITY_FUNCTIONS
+            break;
+
+        case STATE_EXITED:
+        default:
+            wxFAIL_MSG("impossible to set thread priority in this state");
+    }
+}
+
+unsigned int wxThread::GetPriority() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+    return p_internal->GetPriority();

 }
 
 unsigned long wxThread::GetID() const
 {
 }
 
 unsigned long wxThread::GetID() const
 {

-  return (unsigned long)p_internal->thread_id;
+    return (unsigned long)p_internal->thread_id;

 }
 
 }
 

-void wxThread::Exit(void *status)
+// -----------------------------------------------------------------------------
+// pause/resume
+// -----------------------------------------------------------------------------
+
+wxThreadError wxThread::Pause()

 {
 {

-  wxThread* ptr = this;
+    wxCriticalSectionLocker lock(m_critsect);

 
 

-  THREAD_SEND_EXIT_MSG(ptr);
-  p_internal->state = STATE_EXITED;
-  pthread_exit(status);
+    if ( p_internal->GetState() != STATE_RUNNING )
+    {
+        wxLogDebug("Can't pause thread which is not running.");
+
+        return wxTHREAD_NOT_RUNNING;
+    }
+
+    p_internal->SetState(STATE_PAUSED);
+
+    return wxTHREAD_NO_ERROR;

 }
 
 }
 

-void wxThread::TestDestroy()
+wxThreadError wxThread::Resume()

 {
 {

-  pthread_testcancel();
+    wxCriticalSectionLocker lock(m_critsect);
+
+    if ( p_internal->GetState() == STATE_PAUSED )
+    {
+        p_internal->Resume();
+
+        return wxTHREAD_NO_ERROR;
+    }
+    else
+    {
+        wxLogDebug("Attempt to resume a thread which is not paused.");
+
+        return wxTHREAD_MISC_ERROR;
+    }

 }
 
 }
 

-bool wxThread::IsMain()
+// -----------------------------------------------------------------------------
+// exiting thread
+// -----------------------------------------------------------------------------
+
+wxThread::ExitCode wxThread::Delete()

 {
 {

-  return (bool)pthread_equal(pthread_self(), p_mainid);
+    m_critsect.Enter();
+    thread_state state = p_internal->GetState();
+    m_critsect.Leave();
+
+    switch ( state )
+    {
+        case STATE_NEW:
+        case STATE_EXITED:
+            // nothing to do
+            break;
+
+        case STATE_PAUSED:
+            // resume the thread first
+            Resume();
+
+            // fall through
+
+        default:
+            // set the flag telling to the thread to stop and wait
+            p_internal->Cancel();
+    }
+
+    return NULL;

 }
 
 }
 

-wxThread::wxThread()
+wxThreadError wxThread::Kill()
+{
+    switch ( p_internal->GetState() )
+    {
+        case STATE_NEW:
+        case STATE_EXITED:
+            return wxTHREAD_NOT_RUNNING;
+
+        default:
+#ifdef HAVE_PTHREAD_CANCEL
+            if ( pthread_cancel(p_internal->GetId()) != 0 )
+#endif
+            {
+                wxLogError(_("Failed to terminate a thread."));
+
+                return wxTHREAD_MISC_ERROR;
+            }
+
+            return wxTHREAD_NO_ERROR;
+    }
+}
+
+void wxThread::Exit(void *status)

 {
 {

-  p_internal = new wxThreadInternal();
+    // first call user-level clean up code
+    OnExit();
+
+    // next wake up the threads waiting for us (OTOH, this function won't return
+    // until someone waited for us!)
+    p_internal->SignalExit();
+
+    p_internal->SetState(STATE_EXITED);
+
+    // delete both C++ thread object and terminate the OS thread object
+    delete this;
+    pthread_exit(status);
+}
+
+// also test whether we were paused
+bool wxThread::TestDestroy()
+{
+    wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect);
+
+    if ( p_internal->GetState() == STATE_PAUSED )
+    {
+        // leave the crit section or the other threads will stop too if they try
+        // to call any of (seemingly harmless) IsXXX() functions while we sleep
+        m_critsect.Leave();
+
+        p_internal->Pause();
+
+        // enter it back before it's finally left in lock object dtor
+        m_critsect.Enter();
+    }
+
+    return p_internal->WasCancelled();

 }
 
 wxThread::~wxThread()
 {
 }
 
 wxThread::~wxThread()
 {

-  Destroy();
-  Join();
-  delete p_internal;
+    // remove this thread from the global array
+    gs_allThreads.Remove(this);

 }
 
 }
 

-// The default callback just joins the thread and throws away the result.
-void wxThread::OnExit()
+// -----------------------------------------------------------------------------
+// state tests
+// -----------------------------------------------------------------------------
+
+bool wxThread::IsRunning() const

 {
 {

+    wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
+
+    return p_internal->GetState() == STATE_RUNNING;

 }
 
 }
 

-// Automatic initialization
-class wxThreadModule : public wxModule {
-  DECLARE_DYNAMIC_CLASS(wxThreadModule)
+bool wxThread::IsAlive() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect);
+
+    switch ( p_internal->GetState() )
+    {
+        case STATE_RUNNING:
+        case STATE_PAUSED:
+            return TRUE;
+
+        default:
+            return FALSE;
+    }
+}
+
+//--------------------------------------------------------------------
+// wxThreadModule
+//--------------------------------------------------------------------
+
+class wxThreadModule : public wxModule
+{

 public:
 public:

-  virtual bool OnInit() {
+    virtual bool OnInit();
+    virtual void OnExit();
+
+private:
+    DECLARE_DYNAMIC_CLASS(wxThreadModule)
+};
+
+IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
+
+bool wxThreadModule::OnInit()
+{
+    if ( pthread_key_create(&gs_keySelf, NULL /* dtor function */) != 0 )
+    {
+        wxLogError(_("Thread module initialization failed: "
+                     "failed to create pthread key."));
+
+        return FALSE;
+    }
+
+    gs_mutexGui = new wxMutex();

     wxThreadGuiInit();
     wxThreadGuiInit();

-    p_mainid = pthread_self();
-    wxMainMutex.Lock();
+    gs_tidMain = pthread_self();
+    gs_mutexGui->Lock();

 
     return TRUE;
 
     return TRUE;

-  }
+}
+
+void wxThreadModule::OnExit()
+{
+    wxASSERT_MSG( wxThread::IsMain(), "only main thread can be here" );
+
+    // terminate any threads left
+    size_t count = gs_allThreads.GetCount();
+    if ( count != 0u )
+        wxLogDebug("Some threads were not terminated by the application.");

 
 

-  virtual void OnExit() {
-    wxMainMutex.Unlock();
+    for ( size_t n = 0u; n < count; n++ )
+    {
+        gs_allThreads[n]->Delete();
+    }
+
+    // destroy GUI mutex
+    gs_mutexGui->Unlock();

     wxThreadGuiExit();
     wxThreadGuiExit();

-  }
-};
+    delete gs_mutexGui;

 
 

-IMPLEMENT_DYNAMIC_CLASS(wxThreadModule, wxModule)
+    // and free TLD slot
+    (void)pthread_key_delete(gs_keySelf);
+}