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

diff --git a/src/unix/threadpsx.cpp b/src/unix/threadpsx.cpp
index 50e99df2a72fd6a3a55415a4d3d606ac916fd674..ccec6bbc2ef08c6c4885356e6819931f266acf1f 100644 (file)
--- a/src/unix/threadpsx.cpp
+++ b/src/unix/threadpsx.cpp
@@ -24,9 +24,7 @@
     #pragma implementation "thread.h"
 #endif
 
     #pragma implementation "thread.h"
 #endif
 

-// With simple makefiles, we must ignore the file body if not using
-// threads.
-#include "wx/setup.h"
+#include "wx/defs.h"

 
 #if wxUSE_THREADS
 
 
 #if wxUSE_THREADS
 


@@ -47,6 +45,15 @@
     #include <sched.h>
 #endif
 
     #include <sched.h>
 #endif
 

+#ifdef HAVE_THR_SETCONCURRENCY
+    #include <thread.h>
+#endif
+
+// we use wxFFile under Linux in GetCPUCount()
+#ifdef __LINUX__
+    #include "wx/ffile.h"
+#endif
+

 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // constants
 // ----------------------------------------------------------------------------


@@ -60,6 +67,48 @@ enum wxThreadState
     STATE_EXITED        // thread doesn't exist any more
 };
 
     STATE_EXITED        // thread doesn't exist any more
 };
 

+// the exit value of a thread which has been cancelled
+static const wxThread::ExitCode EXITCODE_CANCELLED = (wxThread::ExitCode)-1;
+
+// our trace mask
+#define TRACE_THREADS   _T("thread")
+
+// ----------------------------------------------------------------------------
+// private functions
+// ----------------------------------------------------------------------------
+
+static void ScheduleThreadForDeletion();
+static void DeleteThread(wxThread *This);
+
+// ----------------------------------------------------------------------------
+// private classes
+// ----------------------------------------------------------------------------
+
+// same as wxMutexLocker but for "native" mutex
+class MutexLock
+{
+public:
+    MutexLock(pthread_mutex_t& mutex)
+    {
+        m_mutex = &mutex;
+        if ( pthread_mutex_lock(m_mutex) != 0 )
+        {
+            wxLogDebug(_T("pthread_mutex_lock() failed"));
+        }
+    }
+
+    ~MutexLock()
+    {
+        if ( pthread_mutex_unlock(m_mutex) != 0 )
+        {
+            wxLogDebug(_T("pthread_mutex_unlock() failed"));
+        }
+    }
+
+private:
+    pthread_mutex_t *m_mutex;
+};
+

 // ----------------------------------------------------------------------------
 // types
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // types
 // ----------------------------------------------------------------------------


@@ -81,8 +130,21 @@ static pthread_t gs_tidMain;
 // the key for the pointer to the associated wxThread object
 static pthread_key_t gs_keySelf;
 
 // 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;
+// the number of threads which are being deleted - the program won't exit
+// until there are any left
+static size_t gs_nThreadsBeingDeleted = 0;
+
+// a mutex to protect gs_nThreadsBeingDeleted
+static pthread_mutex_t gs_mutexDeleteThread;
+
+// and a condition variable which will be signaled when all
+// gs_nThreadsBeingDeleted will have been deleted
+static wxCondition *gs_condAllDeleted = (wxCondition *)NULL;
+
+#if wxUSE_GUI
+    // this mutex must be acquired before any call to a GUI function
+    static wxMutex *gs_mutexGui;
+#endif // wxUSE_GUI

 
 // ============================================================================
 // implementation
 
 // ============================================================================
 // implementation


@@ -95,31 +157,51 @@ static wxMutex *gs_mutexGui;
 class wxMutexInternal
 {
 public:
 class wxMutexInternal
 {
 public:

-    pthread_mutex_t p_mutex;
+    pthread_mutex_t m_mutex;

 };
 
 wxMutex::wxMutex()
 {
 };
 
 wxMutex::wxMutex()
 {

-    p_internal = new wxMutexInternal;
-    pthread_mutex_init( &(p_internal->p_mutex), (const pthread_mutexattr_t*) NULL );
+    m_internal = new wxMutexInternal;
+
+    // support recursive locks like Win32, i.e. a thread can lock a mutex which
+    // it had itself already locked
+    //
+    // but initialization of recursive mutexes is non portable <sigh>, so try
+    // several methods
+#ifdef HAVE_PTHREAD_MUTEXATTR_T
+    pthread_mutexattr_t attr;
+    pthread_mutexattr_init(&attr);
+    pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
+
+    pthread_mutex_init(&(m_internal->m_mutex), &attr);
+#elif defined(HAVE_PTHREAD_RECURSIVE_MUTEX_INITIALIZER)
+    // we can use this only as initializer so we have to assign it first to a
+    // temp var - assigning directly to m_mutex wouldn't even compile
+    pthread_mutex_t mutex = PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP;
+    m_internal->m_mutex = mutex;
+#else // no recursive mutexes
+    pthread_mutex_init(&(m_internal->m_mutex), NULL);
+#endif // HAVE_PTHREAD_MUTEXATTR_T/...
+

     m_locked = 0;
 }
 
 wxMutex::~wxMutex()
 {
     if (m_locked > 0)
     m_locked = 0;
 }
 
 wxMutex::~wxMutex()
 {
     if (m_locked > 0)

-        wxLogDebug("Freeing a locked mutex (%d locks)", m_locked);
+        wxLogDebug(wxT("Freeing a locked mutex (%d locks)"), m_locked);

 
 

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

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

-    int err = pthread_mutex_lock( &(p_internal->p_mutex) );
+    int err = pthread_mutex_lock( &(m_internal->m_mutex) );

     if (err == EDEADLK)
     {
     if (err == EDEADLK)
     {

-        wxLogDebug("Locking this mutex would lead to deadlock!");
+        wxLogDebug(wxT("Locking this mutex would lead to deadlock!"));

 
         return wxMUTEX_DEAD_LOCK;
     }
 
         return wxMUTEX_DEAD_LOCK;
     }


@@ -136,7 +218,7 @@ wxMutexError wxMutex::TryLock()
         return wxMUTEX_BUSY;
     }
 
         return wxMUTEX_BUSY;
     }
 

-    int err = pthread_mutex_trylock( &(p_internal->p_mutex) );
+    int err = pthread_mutex_trylock( &(m_internal->m_mutex) );

     switch (err)
     {
         case EBUSY: return wxMUTEX_BUSY;
     switch (err)
     {
         case EBUSY: return wxMUTEX_BUSY;


@@ -155,12 +237,12 @@ wxMutexError wxMutex::Unlock()
     }
     else
     {
     }
     else
     {

-        wxLogDebug("Unlocking not locked mutex.");
+        wxLogDebug(wxT("Unlocking not locked mutex."));

 
         return wxMUTEX_UNLOCKED;
     }
 
 
         return wxMUTEX_UNLOCKED;
     }
 

-    pthread_mutex_unlock( &(p_internal->p_mutex) );
+    pthread_mutex_unlock( &(m_internal->m_mutex) );

 
     return wxMUTEX_NO_ERROR;
 }
 
     return wxMUTEX_NO_ERROR;
 }


@@ -169,47 +251,239 @@ wxMutexError wxMutex::Unlock()
 // wxCondition (Posix implementation)
 //--------------------------------------------------------------------
 
 // wxCondition (Posix implementation)
 //--------------------------------------------------------------------
 

+// The native POSIX condition variables are dumb: if the condition is signaled
+// before another thread starts to wait on it, the signal is lost and so this
+// other thread will be never woken up. It's much more convenient to us to
+// remember that the condition was signaled and to return from Wait()
+// immediately in this case (this is more like Win32 automatic event objects)
+

 class wxConditionInternal
 {
 public:
 class wxConditionInternal
 {
 public:

-  pthread_cond_t p_condition;
+    wxConditionInternal();
+    ~wxConditionInternal();
+
+    void Wait();
+    bool WaitWithTimeout(const timespec* ts);
+
+    void Signal();
+    void Broadcast();
+
+    void WaitDone();
+    bool ShouldWait();
+    bool HasWaiters();
+
+private:
+    bool m_wasSignaled;             // TRUE if condition was signaled while
+                                    // nobody waited for it
+    size_t m_nWaiters;              // TRUE if someone already waits for us
+
+    pthread_mutex_t m_mutexProtect; // protects access to vars above
+
+    pthread_mutex_t m_mutex;        // the mutex used with the condition
+    pthread_cond_t m_condition;     // the condition itself

 };
 
 };
 

+wxConditionInternal::wxConditionInternal()
+{
+    m_wasSignaled = FALSE;
+    m_nWaiters = 0;
+
+    if ( pthread_cond_init(&m_condition, (pthread_condattr_t *)NULL) != 0 )
+    {
+        // this is supposed to never happen
+        wxFAIL_MSG( _T("pthread_cond_init() failed") );
+    }
+
+    if ( pthread_mutex_init(&m_mutex, (pthread_mutexattr_t *)NULL) != 0 ||
+         pthread_mutex_init(&m_mutexProtect, NULL) != 0 )
+    {
+        // neither this
+        wxFAIL_MSG( _T("wxCondition: pthread_mutex_init() failed") );
+    }
+
+    // initially the mutex is locked, so no thread can Signal() or Broadcast()
+    // until another thread starts to Wait()
+    if ( pthread_mutex_lock(&m_mutex) != 0 )
+    {
+        wxFAIL_MSG( _T("wxCondition: pthread_mutex_lock() failed") );
+    }
+}
+
+wxConditionInternal::~wxConditionInternal()
+{
+    if ( pthread_cond_destroy( &m_condition ) != 0 )
+    {
+        wxLogDebug(_T("Failed to destroy condition variable (some "
+                      "threads are probably still waiting on it?)"));
+    }
+
+    if ( pthread_mutex_unlock( &m_mutex ) != 0 )
+    {
+        wxLogDebug(_T("wxCondition: failed to unlock the mutex"));
+    }
+
+    if ( pthread_mutex_destroy( &m_mutex ) != 0 ||
+         pthread_mutex_destroy( &m_mutexProtect ) != 0 )
+    {
+        wxLogDebug(_T("Failed to destroy mutex (it is probably locked)"));
+    }
+}
+
+void wxConditionInternal::WaitDone()
+{
+    MutexLock lock(m_mutexProtect);
+
+    m_wasSignaled = FALSE;
+    m_nWaiters--;
+}
+
+bool wxConditionInternal::ShouldWait()
+{
+    MutexLock lock(m_mutexProtect);
+
+    if ( m_wasSignaled )
+    {
+        // the condition was signaled before we started to wait, reset the
+        // flag and return
+        m_wasSignaled = FALSE;
+
+        return FALSE;
+    }
+
+    // we start to wait for it
+    m_nWaiters++;
+
+    return TRUE;
+}
+
+bool wxConditionInternal::HasWaiters()
+{
+    MutexLock lock(m_mutexProtect);
+
+    if ( m_nWaiters )
+    {
+        // someone waits for us, signal the condition normally
+        return TRUE;
+    }
+
+    // nobody waits for us and may be never will - so just remember that the
+    // condition was signaled and don't do anything else
+    m_wasSignaled = TRUE;
+
+    return FALSE;
+}
+
+void wxConditionInternal::Wait()
+{
+    if ( ShouldWait() )
+    {
+        if ( pthread_cond_wait( &m_condition, &m_mutex ) != 0 )
+        {
+            // not supposed to ever happen
+            wxFAIL_MSG( _T("pthread_cond_wait() failed") );
+        }
+    }
+
+    WaitDone();
+}
+
+bool wxConditionInternal::WaitWithTimeout(const timespec* ts)
+{
+    bool ok;
+
+    if ( ShouldWait() )
+    {
+        switch ( pthread_cond_timedwait( &m_condition, &m_mutex, ts ) )
+        {
+            case 0:
+                // condition signaled
+                ok = TRUE;
+                break;
+
+            default:
+                wxLogDebug(_T("pthread_cond_timedwait() failed"));
+
+                // fall through
+
+            case ETIMEDOUT:
+            case EINTR:
+                // wait interrupted or timeout elapsed
+                ok = FALSE;
+        }
+    }
+    else
+    {
+        // the condition had already been signaled before
+        ok = TRUE;
+    }
+
+    WaitDone();
+
+    return ok;
+}
+
+void wxConditionInternal::Signal()
+{
+    if ( HasWaiters() )
+    {
+        MutexLock lock(m_mutex);
+
+        if ( pthread_cond_signal( &m_condition ) != 0 )
+        {
+            // shouldn't ever happen
+            wxFAIL_MSG(_T("pthread_cond_signal() failed"));
+        }
+    }
+}
+
+void wxConditionInternal::Broadcast()
+{
+    if ( HasWaiters() )
+    {
+        MutexLock lock(m_mutex);
+
+        if ( pthread_cond_broadcast( &m_condition ) != 0 )
+        {
+            // shouldn't ever happen
+            wxFAIL_MSG(_T("pthread_cond_broadcast() failed"));
+        }
+    }
+}
+

 wxCondition::wxCondition()
 {
 wxCondition::wxCondition()
 {

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

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

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

 }
 
 }
 

-void wxCondition::Wait(wxMutex& mutex)
+void wxCondition::Wait()

 {
 {

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

 }
 
 }
 

-bool wxCondition::Wait(wxMutex& mutex, unsigned long sec, unsigned long nsec)
+bool wxCondition::Wait(unsigned long sec, unsigned long nsec)

 {
 {

-    struct timespec tspec;
+    timespec tspec;

 
 

-    tspec.tv_sec = time(0L)+sec;
+    tspec.tv_sec = time(0L) + sec;  // FIXME is time(0) correct here?

     tspec.tv_nsec = nsec;
     tspec.tv_nsec = nsec;

-    return (pthread_cond_timedwait(&(p_internal->p_condition), &(mutex.p_internal->p_mutex), &tspec) != ETIMEDOUT);
+
+    return m_internal->WaitWithTimeout(&tspec);

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

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

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

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

 }
 
 //--------------------------------------------------------------------
 }
 
 //--------------------------------------------------------------------


@@ -225,6 +499,11 @@ public:
     // thread entry function
     static void *PthreadStart(void *ptr);
 
     // thread entry function
     static void *PthreadStart(void *ptr);
 

+#if HAVE_THREAD_CLEANUP_FUNCTIONS
+    // thread exit function
+    static void PthreadCleanup(void *ptr);
+#endif
+

     // thread actions
         // start the thread
     wxThreadError Run();
     // thread actions
         // start the thread
     wxThreadError Run();


@@ -232,6 +511,8 @@ public:
     void Wait();
         // wake up threads waiting for our termination
     void SignalExit();
     void Wait();
         // wake up threads waiting for our termination
     void SignalExit();

+        // wake up threads waiting for our start
+    void SignalRun() { m_condRun.Signal(); }

         // go to sleep until Resume() is called
     void Pause();
         // resume the thread
         // go to sleep until Resume() is called
     void Pause();
         // resume the thread


@@ -250,40 +531,75 @@ public:
         // "cancelled" flag
     void SetCancelFlag() { m_cancelled = TRUE; }
     bool WasCancelled() const { return m_cancelled; }
         // "cancelled" flag
     void SetCancelFlag() { m_cancelled = TRUE; }
     bool WasCancelled() const { return m_cancelled; }

+        // exit code
+    void SetExitCode(wxThread::ExitCode exitcode) { m_exitcode = exitcode; }
+    wxThread::ExitCode GetExitCode() const { return m_exitcode; }
+
+        // the pause flag
+    void SetReallyPaused(bool paused) { m_isPaused = paused; }
+    bool IsReallyPaused() const { return m_isPaused; }
+
+        // tell the thread that it is a detached one
+    void Detach()
+    {
+        m_shouldBeJoined = m_shouldBroadcast = FALSE;
+        m_isDetached = TRUE;
+    }
+        // but even detached threads need to notifyus about their termination
+        // sometimes - tell the thread that it should do it
+    void Notify() { m_shouldBroadcast = TRUE; }

 
 private:
     pthread_t     m_threadId;   // id of the thread
     wxThreadState m_state;      // see wxThreadState enum
     int           m_prio;       // in wxWindows units: from 0 to 100
 
 
 private:
     pthread_t     m_threadId;   // id of the thread
     wxThreadState m_state;      // see wxThreadState enum
     int           m_prio;       // in wxWindows units: from 0 to 100
 

-    // set when the thread should terminate
+    // this flag is set when the thread should terminate

     bool m_cancelled;
 
     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 thread creation 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;
+    // this flag is set when the thread is blocking on m_condSuspend
+    bool m_isPaused;
+
+    // the thread exit code - only used for joinable (!detached) threads and
+    // is only valid after the thread termination
+    wxThread::ExitCode m_exitcode;
+
+    // many threads may call Wait(), but only one of them should call
+    // pthread_join(), so we have to keep track of this
+    wxCriticalSection m_csJoinFlag;
+    bool m_shouldBeJoined;
+    bool m_shouldBroadcast;
+    bool m_isDetached;
+
+    // VZ: it's possible that we might do with less than three different
+    //     condition objects - for example, m_condRun and m_condEnd a priori
+    //     won't be used in the same time. But for now I prefer this may be a
+    //     bit less efficient but safer solution of having distinct condition
+    //     variables for each purpose.
+
+    // this condition is signaled by Run() and the threads Entry() is not
+    // called before it is done
+    wxCondition m_condRun;
+
+    // this one is signaled when the thread should resume after having been
+    // Pause()d

     wxCondition m_condSuspend;
     wxCondition m_condSuspend;

+
+    // finally this one is signalled when the thread exits
+    wxCondition m_condEnd;

 };
 
 };
 

+// ----------------------------------------------------------------------------
+// thread startup and exit functions
+// ----------------------------------------------------------------------------
+

 void *wxThreadInternal::PthreadStart(void *ptr)
 {
     wxThread *thread = (wxThread *)ptr;
 void *wxThreadInternal::PthreadStart(void *ptr)
 {
     wxThread *thread = (wxThread *)ptr;

-    wxThreadInternal *pthread = thread->p_internal;
+    wxThreadInternal *pthread = thread->m_internal;

 
 

+    // associate the thread pointer with the newly created thread so that
+    // wxThread::This() will work

     int rc = pthread_setspecific(gs_keySelf, thread);
     if ( rc != 0 )
     {
     int rc = pthread_setspecific(gs_keySelf, thread);
     if ( rc != 0 )
     {


@@ -292,81 +608,178 @@ void *wxThreadInternal::PthreadStart(void *ptr)
         return (void *)-1;
     }
 
         return (void *)-1;
     }
 

+    // have to declare this before pthread_cleanup_push() which defines a
+    // block!
+    bool dontRunAtAll;
+
+#if HAVE_THREAD_CLEANUP_FUNCTIONS
+    // install the cleanup handler which will be called if the thread is
+    // cancelled
+    pthread_cleanup_push(wxThreadInternal::PthreadCleanup, ptr);
+#endif // HAVE_THREAD_CLEANUP_FUNCTIONS
+

     // wait for the condition to be signaled from Run()
     // 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);
+    pthread->m_condRun.Wait();
+
+    // test whether we should run the run at all - may be it was deleted
+    // before it started to Run()?
+    {
+        wxCriticalSectionLocker lock(thread->m_critsect);
+
+        dontRunAtAll = pthread->GetState() == STATE_NEW &&
+                       pthread->WasCancelled();
+    }
+
+    if ( !dontRunAtAll )
+    {
+        // call the main entry
+        pthread->m_exitcode = thread->Entry();
+
+        wxLogTrace(TRACE_THREADS, _T("Thread %ld left its Entry()."),
+                   pthread->GetId());
+
+        {
+            wxCriticalSectionLocker lock(thread->m_critsect);
+
+            wxLogTrace(TRACE_THREADS, _T("Thread %ld changes state to EXITED."),
+                       pthread->GetId());

 
 

-    // mutex state: locked again on exit of Wait()
+            // change the state of the thread to "exited" so that
+            // PthreadCleanup handler won't do anything from now (if it's
+            // called before we do pthread_cleanup_pop below)
+            pthread->SetState(STATE_EXITED);
+        }
+    }
+
+    // NB: at least under Linux, pthread_cleanup_push/pop are macros and pop
+    //     contains the matching '}' for the '{' in push, so they must be used
+    //     in the same block!
+#if HAVE_THREAD_CLEANUP_FUNCTIONS
+    // remove the cleanup handler without executing it
+    pthread_cleanup_pop(FALSE);
+#endif // HAVE_THREAD_CLEANUP_FUNCTIONS

 
 

-    // call the main entry
-    void* status = thread->Entry();
+    if ( dontRunAtAll )
+    {
+        delete thread;

 
 

-    // terminate the thread
-    thread->Exit(status);
+        return EXITCODE_CANCELLED;
+    }
+    else
+    {
+        // terminate the thread
+        thread->Exit(pthread->m_exitcode);

 
 

-    wxFAIL_MSG("wxThread::Exit() can't return.");
+        wxFAIL_MSG(wxT("wxThread::Exit() can't return."));

 
 

-    return NULL;
+        return NULL;
+    }

 }
 
 }
 

+#if HAVE_THREAD_CLEANUP_FUNCTIONS
+
+// this handler is called when the thread is cancelled
+void wxThreadInternal::PthreadCleanup(void *ptr)
+{
+    wxThread *thread = (wxThread *) ptr;
+
+    {
+        wxCriticalSectionLocker lock(thread->m_critsect);
+        if ( thread->m_internal->GetState() == STATE_EXITED )
+        {
+            // thread is already considered as finished.
+            return;
+        }
+    }
+
+    // exit the thread gracefully
+    thread->Exit(EXITCODE_CANCELLED);
+}
+
+#endif // HAVE_THREAD_CLEANUP_FUNCTIONS
+
+// ----------------------------------------------------------------------------
+// wxThreadInternal
+// ----------------------------------------------------------------------------
+

 wxThreadInternal::wxThreadInternal()
 {
     m_state = STATE_NEW;
     m_cancelled = FALSE;
 wxThreadInternal::wxThreadInternal()
 {
     m_state = STATE_NEW;
     m_cancelled = FALSE;

+    m_prio = WXTHREAD_DEFAULT_PRIORITY;
+    m_threadId = 0;
+    m_exitcode = 0;

 
 

-    // this mutex is locked during almost all thread lifetime - it will only be
-    // unlocked in the very end
-    m_mutex.Lock();
+    // set to TRUE only when the thread starts waiting on m_condSuspend
+    m_isPaused = FALSE;

 
 

-    // this mutex is used in Pause()/Resume() and is also locked all the time
-    // unless the thread is paused
-    m_mutexSuspend.Lock();
+    // defaults for joinable threads
+    m_shouldBeJoined = TRUE;
+    m_shouldBroadcast = TRUE;
+    m_isDetached = FALSE;

 }
 
 wxThreadInternal::~wxThreadInternal()
 {
 }
 
 wxThreadInternal::~wxThreadInternal()
 {

-    m_mutexSuspend.Unlock();
-
-    // note that m_mutex will be unlocked by the thread which waits for our
-    // termination

 }
 
 wxThreadError wxThreadInternal::Run()
 {
     wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING,
 }
 
 wxThreadError wxThreadInternal::Run()
 {
     wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING,

-                 "thread may only be started once after successful Create()" );
+                 wxT("thread may only be started once after Create()") );

 
 

-    // 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();
+    SignalRun();

 
 

-    m_state = STATE_RUNNING;
+    SetState(STATE_RUNNING);

 
     return wxTHREAD_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::Wait()
 {
 }
 
 void wxThreadInternal::Wait()
 {

-    wxCHECK_RET( WasCancelled(), "thread should have been cancelled first" );
-

     // 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();
 
     // 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();
 

-    // entering Wait() releases the mutex thus allowing SignalExit() to acquire
-    // it and to signal us its termination
-    m_cond.Wait(m_mutex);
+    bool isDetached = m_isDetached;
+#ifdef __VMS
+   long long id = (long long)GetId();
+#else
+   long id = (long)GetId();
+#endif
+   wxLogTrace(TRACE_THREADS, _T("Starting to wait for thread %ld to exit."),
+               id);
+
+    // wait until the thread terminates (we're blocking in _another_ thread,
+    // of course)
+    m_condEnd.Wait();
+
+    wxLogTrace(TRACE_THREADS, _T("Finished waiting for thread %ld."), id);
+
+    // we can't use any member variables any more if the thread is detached
+    // because it could be already deleted
+    if ( !isDetached )
+    {
+        // to avoid memory leaks we should call pthread_join(), but it must
+        // only be done once
+        wxCriticalSectionLocker lock(m_csJoinFlag);
+
+        if ( m_shouldBeJoined )
+        {
+            // FIXME shouldn't we set cancellation type to DISABLED here? If
+            //       we're cancelled inside pthread_join(), things will almost
+            //       certainly break - but if we disable the cancellation, we
+            //       might deadlock
+            if ( pthread_join((pthread_t)id, &m_exitcode) != 0 )
+            {
+                wxLogError(_("Failed to join a thread, potential memory leak "
+                             "detected - please restart the program"));
+            }

 
 

-    // 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();
+            m_shouldBeJoined = FALSE;
+        }
+    }

 
     // reacquire GUI mutex
     if ( wxThread::IsMain() )
 
     // reacquire GUI mutex
     if ( wxThread::IsMain() )


@@ -375,15 +788,18 @@ void wxThreadInternal::Wait()
 
 void wxThreadInternal::SignalExit()
 {
 
 void wxThreadInternal::SignalExit()
 {

-    // 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();
+    wxLogTrace(TRACE_THREADS, _T("Thread %ld about to exit."), GetId());
+
+    SetState(STATE_EXITED);

 
 

-    // wake up all the threads waiting for our termination
-    m_cond.Broadcast();
+    // wake up all the threads waiting for our termination - if there are any
+    if ( m_shouldBroadcast )
+    {
+        wxLogTrace(TRACE_THREADS, _T("Thread %ld signals end condition."),
+                   GetId());

 
 

-    // after this call mutex will be finally unlocked
-    m_mutex.Unlock();
+        m_condEnd.Broadcast();
+    }

 }
 
 void wxThreadInternal::Pause()
 }
 
 void wxThreadInternal::Pause()


@@ -391,32 +807,42 @@ void wxThreadInternal::Pause()
     // the state is set from the thread which pauses us first, this function
     // is called later so the state should have been already set
     wxCHECK_RET( m_state == STATE_PAUSED,
     // the state is set from the thread which pauses us first, this function
     // is called later so the state should have been already set
     wxCHECK_RET( m_state == STATE_PAUSED,

-                 "thread must first be paused with wxThread::Pause()." );
+                 wxT("thread must first be paused with wxThread::Pause().") );

 
 

-    // don't pause the thread which is being terminated - this would lead to
-    // deadlock if the thread is paused after Delete() had called Resume() but
-    // before it had time to call Wait()
-    if ( WasCancelled() )
-        return;
+    wxLogTrace(TRACE_THREADS, _T("Thread %ld goes to sleep."), GetId());

 
     // wait until the condition is signaled from Resume()
 
     // wait until the condition is signaled from Resume()

-    m_condSuspend.Wait(m_mutexSuspend);
+    m_condSuspend.Wait();

 }
 
 void wxThreadInternal::Resume()
 {
     wxCHECK_RET( m_state == STATE_PAUSED,
 }
 
 void wxThreadInternal::Resume()
 {
     wxCHECK_RET( m_state == STATE_PAUSED,

-                 "can't resume thread which is not suspended." );
+                 wxT("can't resume thread which is not suspended.") );
+
+    // the thread might be not actually paused yet - if there were no call to
+    // TestDestroy() since the last call to Pause() for example
+    if ( IsReallyPaused() )
+    {
+        wxLogTrace(TRACE_THREADS, _T("Waking up thread %ld"), GetId());

 
 

-    // we will be able to lock this mutex only when Pause() starts waiting
-    wxMutexLocker lock(m_mutexSuspend);
-    m_condSuspend.Signal();
+        // wake up Pause()
+        m_condSuspend.Signal();
+
+        // reset the flag
+        SetReallyPaused(FALSE);
+    }
+    else
+    {
+        wxLogTrace(TRACE_THREADS, _T("Thread %ld is not yet really paused"),
+                   GetId());
+    }

 
     SetState(STATE_RUNNING);
 }
 
 // -----------------------------------------------------------------------------
 
     SetState(STATE_RUNNING);
 }
 
 // -----------------------------------------------------------------------------

-// static functions
+// wxThread static functions

 // -----------------------------------------------------------------------------
 
 wxThread *wxThread::This()
 // -----------------------------------------------------------------------------
 
 wxThread *wxThread::This()


@@ -431,7 +857,9 @@ bool wxThread::IsMain()
 
 void wxThread::Yield()
 {
 
 void wxThread::Yield()
 {

+#ifdef HAVE_SCHED_YIELD

     sched_yield();
     sched_yield();

+#endif

 }
 
 void wxThread::Sleep(unsigned long milliseconds)
 }
 
 void wxThread::Sleep(unsigned long milliseconds)


@@ -439,65 +867,184 @@ void wxThread::Sleep(unsigned long milliseconds)
     wxUsleep(milliseconds);
 }
 
     wxUsleep(milliseconds);
 }
 

+int wxThread::GetCPUCount()
+{
+#if defined(__LINUX__) && wxUSE_FFILE
+    // read from proc (can't use wxTextFile here because it's a special file:
+    // it has 0 size but still can be read from)
+    wxLogNull nolog;
+
+    wxFFile file(_T("/proc/cpuinfo"));
+    if ( file.IsOpened() )
+    {
+        // slurp the whole file
+        wxString s;
+        if ( file.ReadAll(&s) )
+        {
+            // (ab)use Replace() to find the number of "processor" strings
+            size_t count = s.Replace(_T("processor"), _T(""));
+            if ( count > 0 )
+            {
+                return count;
+            }
+
+            wxLogDebug(_T("failed to parse /proc/cpuinfo"));
+        }
+        else
+        {
+            wxLogDebug(_T("failed to read /proc/cpuinfo"));
+        }
+    }
+#elif defined(_SC_NPROCESSORS_ONLN)
+    // this works for Solaris
+    int rc = sysconf(_SC_NPROCESSORS_ONLN);
+    if ( rc != -1 )
+    {
+        return rc;
+    }
+#endif // different ways to get number of CPUs
+
+    // unknown
+    return -1;
+}
+
+bool wxThread::SetConcurrency(size_t level)
+{
+#ifdef HAVE_THR_SETCONCURRENCY
+    int rc = thr_setconcurrency(level);
+    if ( rc != 0 )
+    {
+        wxLogSysError(rc, _T("thr_setconcurrency() failed"));
+    }
+
+    return rc == 0;
+#else // !HAVE_THR_SETCONCURRENCY
+    // ok only for the default value
+    return level == 0;
+#endif // HAVE_THR_SETCONCURRENCY/!HAVE_THR_SETCONCURRENCY
+}
+

 // -----------------------------------------------------------------------------
 // creating thread
 // -----------------------------------------------------------------------------
 
 // -----------------------------------------------------------------------------
 // creating thread
 // -----------------------------------------------------------------------------
 

-wxThread::wxThread()
+wxThread::wxThread(wxThreadKind kind)

 {
     // add this thread to the global list of all threads
     gs_allThreads.Add(this);
 
 {
     // add this thread to the global list of all threads
     gs_allThreads.Add(this);
 

-    p_internal = new wxThreadInternal();
+    m_internal = new wxThreadInternal();
+
+    m_isDetached = kind == wxTHREAD_DETACHED;

 }
 
 wxThreadError wxThread::Create()
 {
 }
 
 wxThreadError wxThread::Create()
 {

-    if (p_internal->GetState() != STATE_NEW)
+    if ( m_internal->GetState() != STATE_NEW )
+    {
+        // don't recreate thread

         return wxTHREAD_RUNNING;
         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
 
     // 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 )
+    int policy;
+    if ( pthread_attr_getschedpolicy(&attr, &policy) != 0 )

     {
         wxLogError(_("Cannot retrieve thread scheduling policy."));
     }
 
     {
         wxLogError(_("Cannot retrieve thread scheduling policy."));
     }
 

-    int min_prio = sched_get_priority_min(prio),
-        max_prio = sched_get_priority_max(prio);
+#ifdef __VMS__
+   /* the pthread.h contains too many spaces. This is a work-around */
+# undef sched_get_priority_max
+#undef sched_get_priority_min
+#define sched_get_priority_max(_pol_) \
+     (_pol_ == SCHED_OTHER ? PRI_FG_MAX_NP : PRI_FIFO_MAX)
+#define sched_get_priority_min(_pol_) \
+     (_pol_ == SCHED_OTHER ? PRI_FG_MIN_NP : PRI_FIFO_MIN)
+#endif
+   
+    int max_prio = sched_get_priority_max(policy),
+        min_prio = sched_get_priority_min(policy),
+        prio = m_internal->GetPriority();

 
     if ( min_prio == -1 || max_prio == -1 )
     {
         wxLogError(_("Cannot get priority range for scheduling policy %d."),
 
     if ( min_prio == -1 || max_prio == -1 )
     {
         wxLogError(_("Cannot get priority range for scheduling policy %d."),

-                   prio);
+                   policy);
+    }
+    else if ( max_prio == min_prio )
+    {
+        if ( prio != WXTHREAD_DEFAULT_PRIORITY )
+        {
+            // notify the programmer that this doesn't work here
+            wxLogWarning(_("Thread priority setting is ignored."));
+        }
+        //else: we have default priority, so don't complain
+
+        // anyhow, don't do anything because priority is just ignored

     }
     else
     {
         struct sched_param sp;
     }
     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);
+        if ( pthread_attr_getschedparam(&attr, &sp) != 0 )
+        {
+            wxFAIL_MSG(_T("pthread_attr_getschedparam() failed"));
+        }
+
+        sp.sched_priority = min_prio + (prio*(max_prio - min_prio))/100;
+
+        if ( pthread_attr_setschedparam(&attr, &sp) != 0 )
+        {
+            wxFAIL_MSG(_T("pthread_attr_setschedparam(priority) failed"));
+        }

     }
 #endif // HAVE_THREAD_PRIORITY_FUNCTIONS
 
 #ifdef HAVE_PTHREAD_ATTR_SETSCOPE
     // this will make the threads created by this process really concurrent
     }
 #endif // HAVE_THREAD_PRIORITY_FUNCTIONS
 
 #ifdef HAVE_PTHREAD_ATTR_SETSCOPE
     // this will make the threads created by this process really concurrent

-    pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM);
+    if ( pthread_attr_setscope(&attr, PTHREAD_SCOPE_SYSTEM) != 0 )
+    {
+        wxFAIL_MSG(_T("pthread_attr_setscope(PTHREAD_SCOPE_SYSTEM) failed"));
+    }

 #endif // HAVE_PTHREAD_ATTR_SETSCOPE
 
 #endif // HAVE_PTHREAD_ATTR_SETSCOPE
 

+    // VZ: assume that this one is always available (it's rather fundamental),
+    //     if this function is ever missing we should try to use
+    //     pthread_detach() instead (after thread creation)
+    if ( m_isDetached )
+    {
+        if ( pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED) != 0 )
+        {
+            wxFAIL_MSG(_T("pthread_attr_setdetachstate(DETACHED) failed"));
+        }
+
+        // never try to join detached threads
+        m_internal->Detach();
+    }
+    //else: threads are created joinable by default, it's ok
+

     // create the new OS thread object
     // create the new OS thread object

-    int rc = pthread_create(p_internal->GetIdPtr(), &attr,
-                            wxThreadInternal::PthreadStart, (void *)this);
-    pthread_attr_destroy(&attr);
+    int rc = pthread_create
+             (
+                m_internal->GetIdPtr(),
+                &attr,
+                wxThreadInternal::PthreadStart,
+                (void *)this
+             );
+
+    if ( pthread_attr_destroy(&attr) != 0 )
+    {
+        wxFAIL_MSG(_T("pthread_attr_destroy() failed"));
+    }

 
     if ( rc != 0 )
     {
 
     if ( rc != 0 )
     {

-        p_internal->SetState(STATE_EXITED);
+        m_internal->SetState(STATE_EXITED);
+

         return wxTHREAD_NO_RESOURCE;
     }
 
         return wxTHREAD_NO_RESOURCE;
     }
 


@@ -506,7 +1053,12 @@ wxThreadError wxThread::Create()
 
 wxThreadError wxThread::Run()
 {
 
 wxThreadError wxThread::Run()
 {

-    return p_internal->Run();
+    wxCriticalSectionLocker lock(m_critsect);
+
+    wxCHECK_MSG( m_internal->GetId(), wxTHREAD_MISC_ERROR,
+                 wxT("must call wxThread::Create() first") );
+
+    return m_internal->Run();

 }
 
 // -----------------------------------------------------------------------------
 }
 
 // -----------------------------------------------------------------------------


@@ -517,15 +1069,15 @@ void wxThread::SetPriority(unsigned int prio)
 {
     wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) &&
                  ((int)prio <= (int)WXTHREAD_MAX_PRIORITY),
 {
     wxCHECK_RET( ((int)WXTHREAD_MIN_PRIORITY <= (int)prio) &&
                  ((int)prio <= (int)WXTHREAD_MAX_PRIORITY),

-                 "invalid thread priority" );
+                 wxT("invalid thread priority") );

 
     wxCriticalSectionLocker lock(m_critsect);
 
 
     wxCriticalSectionLocker lock(m_critsect);
 

-    switch ( p_internal->GetState() )
+    switch ( m_internal->GetState() )

     {
         case STATE_NEW:
             // thread not yet started, priority will be set when it is
     {
         case STATE_NEW:
             // thread not yet started, priority will be set when it is

-            p_internal->SetPriority(prio);
+            m_internal->SetPriority(prio);

             break;
 
         case STATE_RUNNING:
             break;
 
         case STATE_RUNNING:


@@ -535,7 +1087,7 @@ void wxThread::SetPriority(unsigned int prio)
                 struct sched_param sparam;
                 sparam.sched_priority = prio;
 
                 struct sched_param sparam;
                 sparam.sched_priority = prio;
 

-                if ( pthread_setschedparam(p_internal->GetId(),
+                if ( pthread_setschedparam(m_internal->GetId(),

                                            SCHED_OTHER, &sparam) != 0 )
                 {
                     wxLogError(_("Failed to set thread priority %d."), prio);
                                            SCHED_OTHER, &sparam) != 0 )
                 {
                     wxLogError(_("Failed to set thread priority %d."), prio);


@@ -546,7 +1098,7 @@ void wxThread::SetPriority(unsigned int prio)
 
         case STATE_EXITED:
         default:
 
         case STATE_EXITED:
         default:

-            wxFAIL_MSG("impossible to set thread priority in this state");
+            wxFAIL_MSG(wxT("impossible to set thread priority in this state"));

     }
 }
 
     }
 }
 


@@ -554,12 +1106,18 @@ unsigned int wxThread::GetPriority() const
 {
     wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
 
 {
     wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
 

-    return p_internal->GetPriority();
+    return m_internal->GetPriority();

 }
 
 }
 

-unsigned long wxThread::GetID() const
+#ifdef __VMS
+unsigned long long wxThread::GetId() const
+{
+    return (unsigned long long)m_internal->GetId();
+#else
+unsigned long wxThread::GetId() const

 {
 {

-    return (unsigned long)p_internal->GetId();
+    return (unsigned long)m_internal->GetId();
+#endif

 }
 
 // -----------------------------------------------------------------------------
 }
 
 // -----------------------------------------------------------------------------


@@ -568,35 +1126,56 @@ unsigned long wxThread::GetID() const
 
 wxThreadError wxThread::Pause()
 {
 
 wxThreadError wxThread::Pause()
 {

+    wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+                 _T("a thread can't pause itself") );
+

     wxCriticalSectionLocker lock(m_critsect);
 
     wxCriticalSectionLocker lock(m_critsect);
 

-    if ( p_internal->GetState() != STATE_RUNNING )
+    if ( m_internal->GetState() != STATE_RUNNING )

     {
     {

-        wxLogDebug("Can't pause thread which is not running.");
+        wxLogDebug(wxT("Can't pause thread which is not running."));

 
         return wxTHREAD_NOT_RUNNING;
     }
 
 
         return wxTHREAD_NOT_RUNNING;
     }
 

-    p_internal->SetState(STATE_PAUSED);
+    wxLogTrace(TRACE_THREADS, _T("Asking thread %ld to pause."),
+               GetId());
+
+    // just set a flag, the thread will be really paused only during the next
+    // call to TestDestroy()
+    m_internal->SetState(STATE_PAUSED);

 
     return wxTHREAD_NO_ERROR;
 }
 
 wxThreadError wxThread::Resume()
 {
 
     return wxTHREAD_NO_ERROR;
 }
 
 wxThreadError wxThread::Resume()
 {

+    wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+                 _T("a thread can't resume itself") );
+

     wxCriticalSectionLocker lock(m_critsect);
 
     wxCriticalSectionLocker lock(m_critsect);
 

-    if ( p_internal->GetState() == STATE_PAUSED )
-    {
-        p_internal->Resume();
+    wxThreadState state = m_internal->GetState();

 
 

-        return wxTHREAD_NO_ERROR;
-    }
-    else
+    switch ( state )

     {
     {

-        wxLogDebug("Attempt to resume a thread which is not paused.");
+        case STATE_PAUSED:
+            wxLogTrace(TRACE_THREADS, _T("Thread %ld suspended, resuming."),
+                       GetId());
+
+            m_internal->Resume();
+
+            return wxTHREAD_NO_ERROR;
+
+        case STATE_EXITED:
+            wxLogTrace(TRACE_THREADS, _T("Thread %ld exited, won't resume."),
+                       GetId());
+            return wxTHREAD_NO_ERROR;
+
+        default:
+            wxLogDebug(_T("Attempt to resume a thread which is not paused."));

 
 

-        return wxTHREAD_MISC_ERROR;
+            return wxTHREAD_MISC_ERROR;

     }
 }
 
     }
 }
 


@@ -604,47 +1183,97 @@ wxThreadError wxThread::Resume()
 // exiting thread
 // -----------------------------------------------------------------------------
 
 // exiting thread
 // -----------------------------------------------------------------------------
 

-wxThread::ExitCode wxThread::Delete()
+wxThread::ExitCode wxThread::Wait()

 {
 {

+    wxCHECK_MSG( This() != this, (ExitCode)-1,
+                 _T("a thread can't wait for itself") );
+
+    wxCHECK_MSG( !m_isDetached, (ExitCode)-1,
+                 _T("can't wait for detached thread") );
+
+    m_internal->Wait();
+
+    return m_internal->GetExitCode();
+}
+
+wxThreadError wxThread::Delete(ExitCode *rc)
+{
+    wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+                 _T("a thread can't delete itself") );
+

     m_critsect.Enter();
     m_critsect.Enter();

-    wxThreadState state = p_internal->GetState();
-    m_critsect.Leave();
+    wxThreadState state = m_internal->GetState();

 
     // ask the thread to stop
 
     // ask the thread to stop

-    p_internal->SetCancelFlag();
+    m_internal->SetCancelFlag();
+
+    if ( m_isDetached )
+    {
+        // detached threads won't broadcast about their termination by default
+        // because usually nobody waits for them - but here we do, so ask the
+        // thread to notify us
+        m_internal->Notify();
+    }
+
+    m_critsect.Leave();

 
     switch ( state )
     {
         case STATE_NEW:
 
     switch ( state )
     {
         case STATE_NEW:

+            // we need to wake up the thread so that PthreadStart() will
+            // terminate - right now it's blocking on m_condRun
+            m_internal->SignalRun();
+
+            // fall through
+

         case STATE_EXITED:
             // nothing to do
             break;
 
         case STATE_PAUSED:
         case STATE_EXITED:
             // nothing to do
             break;
 
         case STATE_PAUSED:

-            // resume the thread first
-            Resume();
+            // resume the thread first (don't call our Resume() because this
+            // would dead lock when it tries to enter m_critsect)
+            m_internal->Resume();

 
             // fall through
 
         default:
             // wait until the thread stops
 
             // fall through
 
         default:
             // wait until the thread stops

-            p_internal->Wait();
+            m_internal->Wait();
+
+            if ( rc )
+            {
+                wxASSERT_MSG( !m_isDetached,
+                              _T("no return code for detached threads") );
+
+                // if it's a joinable thread, it's not deleted yet
+                *rc = m_internal->GetExitCode();
+            }

     }
 
     }
 

-    return NULL;
+    return wxTHREAD_NO_ERROR;

 }
 
 wxThreadError wxThread::Kill()
 {
 }
 
 wxThreadError wxThread::Kill()
 {

-    switch ( p_internal->GetState() )
+    wxCHECK_MSG( This() != this, wxTHREAD_MISC_ERROR,
+                 _T("a thread can't kill itself") );
+
+    switch ( m_internal->GetState() )

     {
         case STATE_NEW:
         case STATE_EXITED:
             return wxTHREAD_NOT_RUNNING;
 
     {
         case STATE_NEW:
         case STATE_EXITED:
             return wxTHREAD_NOT_RUNNING;
 

+        case STATE_PAUSED:
+            // resume the thread first
+            Resume();
+
+            // fall through
+

         default:
         default:

-#ifdef HAVE_PTHREAD_CANCEL 
-            if ( pthread_cancel(p_internal->GetId()) != 0 )
+#ifdef HAVE_PTHREAD_CANCEL
+            if ( pthread_cancel(m_internal->GetId()) != 0 )

 #endif
             {
                 wxLogError(_("Failed to terminate a thread."));
 #endif
             {
                 wxLogError(_("Failed to terminate a thread."));


@@ -652,50 +1281,135 @@ wxThreadError wxThread::Kill()
                 return wxTHREAD_MISC_ERROR;
             }
 
                 return wxTHREAD_MISC_ERROR;
             }
 

+            if ( m_isDetached )
+            {
+                // if we use cleanup function, this will be done from
+                // PthreadCleanup()
+#if !HAVE_THREAD_CLEANUP_FUNCTIONS
+                ScheduleThreadForDeletion();
+
+                // don't call OnExit() here, it can only be called in the
+                // threads context and we're in the context of another thread
+
+                DeleteThread(this);
+#endif // HAVE_THREAD_CLEANUP_FUNCTIONS
+            }
+            else
+            {
+                m_internal->SetExitCode(EXITCODE_CANCELLED);
+            }
+

             return wxTHREAD_NO_ERROR;
     }
 }
 
             return wxTHREAD_NO_ERROR;
     }
 }
 

-void wxThread::Exit(void *status)
+void wxThread::Exit(ExitCode status)

 {
 {

-    // first call user-level clean up code
+    wxASSERT_MSG( This() == this,
+                  _T("wxThread::Exit() can only be called in the "
+                     "context of the same thread") );
+
+    // from the moment we call OnExit(), the main program may terminate at any
+    // moment, so mark this thread as being already in process of being
+    // deleted or wxThreadModule::OnExit() will try to delete it again
+    ScheduleThreadForDeletion();
+
+    // don't enter m_critsect before calling OnExit() because the user code
+    // might deadlock if, for example, it signals a condition in OnExit() (a
+    // common case) while the main thread calls any of functions entering
+    // m_critsect on us (almost all of them do)

     OnExit();
 
     OnExit();
 

+    // now do enter it because SignalExit() will change our state
+    m_critsect.Enter();
+

     // next wake up the threads waiting for us (OTOH, this function won't return
     // until someone waited for us!)
     // next wake up the threads waiting for us (OTOH, this function won't return
     // until someone waited for us!)

-    p_internal->SignalExit();
+    m_internal->SignalExit();
+
+    // leave the critical section before entering the dtor which tries to
+    // enter it
+    m_critsect.Leave();

 
 

-    p_internal->SetState(STATE_EXITED);
+    // delete C++ thread object if this is a detached thread - user is
+    // responsible for doing this for joinable ones
+    if ( m_isDetached )
+    {
+        // FIXME I'm feeling bad about it - what if another thread function is
+        //       called (in another thread context) now? It will try to access
+        //       half destroyed object which will probably result in something
+        //       very bad - but we can't protect this by a crit section unless
+        //       we make it a global object, but this would mean that we can
+        //       only call one thread function at a time :-(
+        DeleteThread(this);
+    }

 
 

-    // delete both C++ thread object and terminate the OS thread object
-    delete this;
+    // terminate the thread (pthread_exit() never returns)

     pthread_exit(status);
     pthread_exit(status);

+
+    wxFAIL_MSG(_T("pthread_exit() failed"));

 }
 
 // also test whether we were paused
 bool wxThread::TestDestroy()
 {
 }
 
 // also test whether we were paused
 bool wxThread::TestDestroy()
 {

-    wxCriticalSectionLocker lock(m_critsect);
+    wxASSERT_MSG( This() == this,
+                  _T("wxThread::TestDestroy() can only be called in the "
+                     "context of the same thread") );
+
+    m_critsect.Enter();

 
 

-    if ( p_internal->GetState() == STATE_PAUSED )
+    if ( m_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();
+        m_internal->SetReallyPaused(TRUE);

 
 

-        p_internal->Pause();
+        // 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();

 
 

-        // enter it back before it's finally left in lock object dtor
-        m_critsect.Enter();
+        m_internal->Pause();
+    }
+    else
+    {
+        // thread wasn't requested to pause, nothing to do
+        m_critsect.Leave();

     }
 
     }
 

-    return p_internal->WasCancelled();
+    return m_internal->WasCancelled();

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

+#ifdef __WXDEBUG__
+    m_critsect.Enter();
+
+    // check that the thread either exited or couldn't be created
+    if ( m_internal->GetState() != STATE_EXITED &&
+         m_internal->GetState() != STATE_NEW )
+    {
+        wxLogDebug(_T("The thread %ld is being destroyed although it is still "
+                      "running! The application may crash."), GetId());
+    }
+
+    m_critsect.Leave();
+#endif // __WXDEBUG__
+
+    delete m_internal;
+

     // remove this thread from the global array
     gs_allThreads.Remove(this);
     // remove this thread from the global array
     gs_allThreads.Remove(this);

+
+    // detached thread will decrement this counter in DeleteThread(), but it
+    // is not called for the joinable threads, so do it here
+    if ( !m_isDetached )
+    {
+        MutexLock lock(gs_mutexDeleteThread);
+        gs_nThreadsBeingDeleted--;
+
+        wxLogTrace(TRACE_THREADS, _T("%u scheduled for deletion threads left."),
+                   gs_nThreadsBeingDeleted - 1);
+    }

 }
 
 // -----------------------------------------------------------------------------
 }
 
 // -----------------------------------------------------------------------------


@@ -706,14 +1420,14 @@ bool wxThread::IsRunning() const
 {
     wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
 
 {
     wxCriticalSectionLocker lock((wxCriticalSection &)m_critsect);
 

-    return p_internal->GetState() == STATE_RUNNING;
+    return m_internal->GetState() == STATE_RUNNING;

 }
 
 bool wxThread::IsAlive() const
 {
     wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect);
 
 }
 
 bool wxThread::IsAlive() const
 {
     wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect);
 

-    switch ( p_internal->GetState() )
+    switch ( m_internal->GetState() )

     {
         case STATE_RUNNING:
         case STATE_PAUSED:
     {
         case STATE_RUNNING:
         case STATE_PAUSED:


@@ -724,6 +1438,13 @@ bool wxThread::IsAlive() const
     }
 }
 
     }
 }
 

+bool wxThread::IsPaused() const
+{
+    wxCriticalSectionLocker lock((wxCriticalSection&)m_critsect);
+
+    return (m_internal->GetState() == STATE_PAUSED);
+}
+

 //--------------------------------------------------------------------
 // wxThreadModule
 //--------------------------------------------------------------------
 //--------------------------------------------------------------------
 // wxThreadModule
 //--------------------------------------------------------------------


@@ -751,36 +1472,62 @@ bool wxThreadModule::OnInit()
         return FALSE;
     }
 
         return FALSE;
     }
 

-    gs_mutexGui = new wxMutex();
+    gs_tidMain = pthread_self();

 
 

-    //wxThreadGuiInit();
+#if wxUSE_GUI
+    gs_mutexGui = new wxMutex();

 
 

-    gs_tidMain = pthread_self();

     gs_mutexGui->Lock();
     gs_mutexGui->Lock();

+#endif // wxUSE_GUI
+
+    // under Solaris we get a warning from CC when using
+    // PTHREAD_MUTEX_INITIALIZER, so do it dynamically
+    pthread_mutex_init(&gs_mutexDeleteThread, NULL);

 
     return TRUE;
 }
 
 void wxThreadModule::OnExit()
 {
 
     return TRUE;
 }
 
 void wxThreadModule::OnExit()
 {

-    wxASSERT_MSG( wxThread::IsMain(), "only main thread can be here" );
+    wxASSERT_MSG( wxThread::IsMain(), wxT("only main thread can be here") );
+
+    // are there any threads left which are being deleted right now?
+    size_t nThreadsBeingDeleted;
+    {
+        MutexLock lock(gs_mutexDeleteThread);
+        nThreadsBeingDeleted = gs_nThreadsBeingDeleted;
+    }
+
+    if ( nThreadsBeingDeleted > 0 )
+    {
+        wxLogTrace(TRACE_THREADS, _T("Waiting for %u threads to disappear"),
+                   nThreadsBeingDeleted);
+
+        // have to wait until all of them disappear
+        gs_condAllDeleted->Wait();
+    }

 
     // terminate any threads left
     size_t count = gs_allThreads.GetCount();
     if ( count != 0u )
 
     // terminate any threads left
     size_t count = gs_allThreads.GetCount();
     if ( count != 0u )

-        wxLogDebug("Some threads were not terminated by the application.");
+    {
+        wxLogDebug(wxT("%u threads were not terminated by the application."),
+                   count);
+    }

 
     for ( size_t n = 0u; n < count; n++ )
     {
 
     for ( size_t n = 0u; n < count; n++ )
     {

-        gs_allThreads[n]->Delete();
+        // Delete calls the destructor which removes the current entry. We
+        // should only delete the first one each time.
+        gs_allThreads[0]->Delete();

     }
 
     }
 

+#if wxUSE_GUI

     // destroy GUI mutex
     gs_mutexGui->Unlock();
 
     // destroy GUI mutex
     gs_mutexGui->Unlock();
 

-    //wxThreadGuiExit();
-

     delete gs_mutexGui;
     delete gs_mutexGui;

+#endif // wxUSE_GUI

 
     // and free TLD slot
     (void)pthread_key_delete(gs_keySelf);
 
     // and free TLD slot
     (void)pthread_key_delete(gs_keySelf);


@@ -790,14 +1537,63 @@ void wxThreadModule::OnExit()
 // global functions
 // ----------------------------------------------------------------------------
 
 // global functions
 // ----------------------------------------------------------------------------
 

+static void ScheduleThreadForDeletion()
+{
+    MutexLock lock(gs_mutexDeleteThread);
+
+    if ( gs_nThreadsBeingDeleted == 0 )
+    {
+        gs_condAllDeleted = new wxCondition;
+    }
+
+    gs_nThreadsBeingDeleted++;
+
+    wxLogTrace(TRACE_THREADS, _T("%u thread%s waiting to be deleted"),
+               gs_nThreadsBeingDeleted,
+               gs_nThreadsBeingDeleted == 1 ? "" : "s");
+}
+
+static void DeleteThread(wxThread *This)
+{
+    // gs_mutexDeleteThread should be unlocked before signalling the condition
+    // or wxThreadModule::OnExit() would deadlock
+    {
+        MutexLock lock(gs_mutexDeleteThread);
+
+        wxLogTrace(TRACE_THREADS, _T("Thread %ld auto deletes."), This->GetId());
+
+        delete This;
+
+        wxCHECK_RET( gs_nThreadsBeingDeleted > 0,
+                     _T("no threads scheduled for deletion, yet we delete "
+                        "one?") );
+    }
+
+    wxLogTrace(TRACE_THREADS, _T("%u scheduled for deletion threads left."),
+               gs_nThreadsBeingDeleted - 1);
+
+    if ( !--gs_nThreadsBeingDeleted )
+    {
+        // no more threads left, signal it
+        gs_condAllDeleted->Signal();
+
+        delete gs_condAllDeleted;
+        gs_condAllDeleted = (wxCondition *)NULL;
+    }
+}
+

 void wxMutexGuiEnter()
 {
 void wxMutexGuiEnter()
 {

-  gs_mutexGui->Lock();
+#if wxUSE_GUI
+    gs_mutexGui->Lock();
+#endif // wxUSE_GUI

 }
 
 void wxMutexGuiLeave()
 {
 }
 
 void wxMutexGuiLeave()
 {

-  gs_mutexGui->Unlock();
+#if wxUSE_GUI
+    gs_mutexGui->Unlock();
+#endif // wxUSE_GUI

 }
 
 #endif
 }
 
 #endif