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

diff --git a/src/unix/threadpsx.cpp b/src/unix/threadpsx.cpp
index 197d935d3d25106e511a660aa5277cc26f8634df..ccec6bbc2ef08c6c4885356e6819931f266acf1f 100644 (file)
--- a/src/unix/threadpsx.cpp
+++ b/src/unix/threadpsx.cpp
@@ -45,6 +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
 // ----------------------------------------------------------------------------


@@ -126,7 +135,7 @@ static pthread_key_t gs_keySelf;
 static size_t gs_nThreadsBeingDeleted = 0;
 
 // a mutex to protect gs_nThreadsBeingDeleted
 static size_t gs_nThreadsBeingDeleted = 0;
 
 // a mutex to protect gs_nThreadsBeingDeleted

-static pthread_mutex_t gs_mutexDeleteThread = PTHREAD_MUTEX_INITIALIZER;
+static pthread_mutex_t gs_mutexDeleteThread;

 
 // and a condition variable which will be signaled when all
 // gs_nThreadsBeingDeleted will have been deleted
 
 // and a condition variable which will be signaled when all
 // gs_nThreadsBeingDeleted will have been deleted


@@ -155,8 +164,26 @@ wxMutex::wxMutex()
 {
     m_internal = new wxMutexInternal;
 
 {
     m_internal = new wxMutexInternal;
 

-    pthread_mutex_init(&(m_internal->m_mutex),
-                       (pthread_mutexattr_t*) NULL );
+    // 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;
 }
 
     m_locked = 0;
 }
 


@@ -224,9 +251,12 @@ wxMutexError wxMutex::Unlock()
 // wxCondition (Posix implementation)
 //--------------------------------------------------------------------
 
 // wxCondition (Posix implementation)
 //--------------------------------------------------------------------
 

-// notice that we must use a mutex with POSIX condition variables to ensure
-// that the worker thread doesn't signal condition before the waiting thread
-// starts to wait for it
+// 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:


@@ -239,20 +269,34 @@ public:
     void Signal();
     void Broadcast();
 
     void Signal();
     void Broadcast();
 

+    void WaitDone();
+    bool ShouldWait();
+    bool HasWaiters();
+

 private:
 private:

-    pthread_mutex_t m_mutex;
-    pthread_cond_t m_condition;
+    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()
 {
 };
 
 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_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 )
+    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") );
     {
         // neither this
         wxFAIL_MSG( _T("wxCondition: pthread_mutex_init() failed") );


@@ -279,60 +323,131 @@ wxConditionInternal::~wxConditionInternal()
         wxLogDebug(_T("wxCondition: failed to unlock the mutex"));
     }
 
         wxLogDebug(_T("wxCondition: failed to unlock the mutex"));
     }
 

-    if ( pthread_mutex_destroy( &m_mutex ) != 0 )
+    if ( pthread_mutex_destroy( &m_mutex ) != 0 ||
+         pthread_mutex_destroy( &m_mutexProtect ) != 0 )

     {
         wxLogDebug(_T("Failed to destroy mutex (it is probably locked)"));
     }
 }
 
     {
         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()
 {
 void wxConditionInternal::Wait()
 {

-    if ( pthread_cond_wait( &m_condition, &m_mutex ) != 0 )
+    if ( ShouldWait() )

     {
     {

-        // not supposed to ever happen
-        wxFAIL_MSG( _T("pthread_cond_wait() failed") );
+        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 wxConditionInternal::WaitWithTimeout(const timespec* ts)
 {

-    switch ( pthread_cond_timedwait( &m_condition, &m_mutex, ts ) )
+    bool ok;
+
+    if ( ShouldWait() )

     {
     {

-        case 0:
-            // condition signaled
-            return TRUE;
+        switch ( pthread_cond_timedwait( &m_condition, &m_mutex, ts ) )
+        {
+            case 0:
+                // condition signaled
+                ok = TRUE;
+                break;

 
 

-        default:
-            wxLogDebug(_T("pthread_cond_timedwait() failed"));
+            default:
+                wxLogDebug(_T("pthread_cond_timedwait() failed"));

 
 

-            // fall through
+                // fall through

 
 

-        case ETIMEDOUT:
-        case EINTR:
-            // wait interrupted or timeout elapsed
-            return FALSE;
+            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()
 {
 }
 
 void wxConditionInternal::Signal()
 {

-    MutexLock lock(m_mutex);
-
-    if ( pthread_cond_signal( &m_condition ) != 0 )
+    if ( HasWaiters() )

     {
     {

-        // shouldn't ever happen
-        wxFAIL_MSG(_T("pthread_cond_signal() failed"));
+        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()
 {
     }
 }
 
 void wxConditionInternal::Broadcast()
 {

-    MutexLock lock(m_mutex);
-
-    if ( pthread_cond_broadcast( &m_condition ) != 0 )
+    if ( HasWaiters() )

     {
     {

-        // shouldn't ever happen
-        wxFAIL_MSG(_T("pthread_cond_broadcast() failed"));
+        MutexLock lock(m_mutex);
+
+        if ( pthread_cond_broadcast( &m_condition ) != 0 )
+        {
+            // shouldn't ever happen
+            wxFAIL_MSG(_T("pthread_cond_broadcast() failed"));
+        }

     }
 }
 
     }
 }
 


@@ -396,6 +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


@@ -418,8 +535,16 @@ public:
     void SetExitCode(wxThread::ExitCode exitcode) { m_exitcode = exitcode; }
     wxThread::ExitCode GetExitCode() const { return m_exitcode; }
 
     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
         // tell the thread that it is a detached one

-    void Detach() { m_shouldBeJoined = m_shouldBroadcast = FALSE; }
+    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; }
         // but even detached threads need to notifyus about their termination
         // sometimes - tell the thread that it should do it
     void Notify() { m_shouldBroadcast = TRUE; }


@@ -432,6 +557,9 @@ private:
     // this flag is set when the thread should terminate
     bool m_cancelled;
 
     // this flag is set when the thread should terminate
     bool m_cancelled;
 

+    // 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;
     // the thread exit code - only used for joinable (!detached) threads and
     // is only valid after the thread termination
     wxThread::ExitCode m_exitcode;


@@ -441,6 +569,7 @@ private:
     wxCriticalSection m_csJoinFlag;
     bool m_shouldBeJoined;
     bool m_shouldBroadcast;
     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
 
     // VZ: it's possible that we might do with less than three different
     //     condition objects - for example, m_condRun and m_condEnd a priori


@@ -479,6 +608,10 @@ 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
 #if HAVE_THREAD_CLEANUP_FUNCTIONS
     // install the cleanup handler which will be called if the thread is
     // cancelled


@@ -488,22 +621,34 @@ void *wxThreadInternal::PthreadStart(void *ptr)
     // wait for the condition to be signaled from Run()
     pthread->m_condRun.Wait();
 
     // wait for the condition to be signaled from Run()
     pthread->m_condRun.Wait();
 

-    // call the main entry
-    pthread->m_exitcode = thread->Entry();
+    // test whether we should run the run at all - may be it was deleted
+    // before it started to Run()?
+    {
+        wxCriticalSectionLocker lock(thread->m_critsect);

 
 

-    wxLogTrace(TRACE_THREADS, _T("Thread %ld left its Entry()."),
-               pthread->GetId());
+        dontRunAtAll = pthread->GetState() == STATE_NEW &&
+                       pthread->WasCancelled();
+    }

 
 

+    if ( !dontRunAtAll )

     {
     {

-        wxCriticalSectionLocker lock(thread->m_critsect);
+        // call the main entry
+        pthread->m_exitcode = thread->Entry();

 
 

-        wxLogTrace(TRACE_THREADS, _T("Thread %ld changes state to EXITED."),
+        wxLogTrace(TRACE_THREADS, _T("Thread %ld left its Entry()."),

                    pthread->GetId());
 
                    pthread->GetId());
 

-        // 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);
+        {
+            wxCriticalSectionLocker lock(thread->m_critsect);
+
+            wxLogTrace(TRACE_THREADS, _T("Thread %ld changes state to EXITED."),
+                       pthread->GetId());
+
+            // 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
     }
 
     // NB: at least under Linux, pthread_cleanup_push/pop are macros and pop


@@ -514,12 +659,21 @@ void *wxThreadInternal::PthreadStart(void *ptr)
     pthread_cleanup_pop(FALSE);
 #endif // HAVE_THREAD_CLEANUP_FUNCTIONS
 
     pthread_cleanup_pop(FALSE);
 #endif // HAVE_THREAD_CLEANUP_FUNCTIONS
 

-    // terminate the thread
-    thread->Exit(pthread->m_exitcode);
+    if ( dontRunAtAll )
+    {
+        delete thread;

 
 

-    wxFAIL_MSG(wxT("wxThread::Exit() can't return."));
+        return EXITCODE_CANCELLED;
+    }
+    else
+    {
+        // terminate the thread
+        thread->Exit(pthread->m_exitcode);

 
 

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

 }
 
 #if HAVE_THREAD_CLEANUP_FUNCTIONS
 }
 
 #if HAVE_THREAD_CLEANUP_FUNCTIONS


@@ -556,9 +710,13 @@ wxThreadInternal::wxThreadInternal()
     m_threadId = 0;
     m_exitcode = 0;
 
     m_threadId = 0;
     m_exitcode = 0;
 

+    // set to TRUE only when the thread starts waiting on m_condSuspend
+    m_isPaused = FALSE;
+

     // defaults for joinable threads
     m_shouldBeJoined = TRUE;
     m_shouldBroadcast = TRUE;
     // defaults for joinable threads
     m_shouldBeJoined = TRUE;
     m_shouldBroadcast = TRUE;

+    m_isDetached = FALSE;

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


@@ -570,7 +728,7 @@ wxThreadError wxThreadInternal::Run()
     wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING,
                  wxT("thread may only be started once after Create()") );
 
     wxCHECK_MSG( GetState() == STATE_NEW, wxTHREAD_RUNNING,
                  wxT("thread may only be started once after Create()") );
 

-    m_condRun.Signal();
+    SignalRun();

 
     SetState(STATE_RUNNING);
 
 
     SetState(STATE_RUNNING);
 


@@ -584,29 +742,43 @@ void wxThreadInternal::Wait()
     if ( wxThread::IsMain() )
         wxMutexGuiLeave();
 
     if ( wxThread::IsMain() )
         wxMutexGuiLeave();
 

-    wxLogTrace(TRACE_THREADS, _T("Starting to wait for thread %ld to exit."),
-               GetId());
+    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();
 
 
     // wait until the thread terminates (we're blocking in _another_ thread,
     // of course)
     m_condEnd.Wait();
 

-    // to avoid memory leaks we should call pthread_join(), but it must only
-    // be done once
-    wxCriticalSectionLocker lock(m_csJoinFlag);
+    wxLogTrace(TRACE_THREADS, _T("Finished waiting for thread %ld."), id);

 
 

-    if ( m_shouldBeJoined )
+    // we can't use any member variables any more if the thread is detached
+    // because it could be already deleted
+    if ( !isDetached )

     {
     {

-        // 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(GetId(), &m_exitcode) != 0 )
+        // to avoid memory leaks we should call pthread_join(), but it must
+        // only be done once
+        wxCriticalSectionLocker lock(m_csJoinFlag);
+
+        if ( m_shouldBeJoined )

         {
         {

-            wxLogError(_T("Failed to join a thread, potential memory leak "
-                          "detected - please restart the program"));
-        }
+            // 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"));
+            }

 
 

-        m_shouldBeJoined = FALSE;
+            m_shouldBeJoined = FALSE;
+        }

     }
 
     // reacquire GUI mutex
     }
 
     // reacquire GUI mutex


@@ -648,10 +820,23 @@ void wxThreadInternal::Resume()
     wxCHECK_RET( m_state == STATE_PAUSED,
                  wxT("can't resume thread which is not suspended.") );
 
     wxCHECK_RET( m_state == STATE_PAUSED,
                  wxT("can't resume thread which is not suspended.") );
 

-    wxLogTrace(TRACE_THREADS, _T("Waking up thread %ld"), GetId());
+    // 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());

 
 

-    // wake up Pause()
-    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);
 }


@@ -672,7 +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)


@@ -680,6 +867,63 @@ 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
 // -----------------------------------------------------------------------------


@@ -713,8 +957,18 @@ wxThreadError wxThread::Create()
         wxLogError(_("Cannot retrieve thread scheduling policy."));
     }
 
         wxLogError(_("Cannot retrieve thread scheduling policy."));
     }
 

-    int min_prio = sched_get_priority_min(policy),
-        max_prio = sched_get_priority_max(policy),
+#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 )
         prio = m_internal->GetPriority();
 
     if ( min_prio == -1 || max_prio == -1 )


@@ -855,9 +1109,15 @@ unsigned int wxThread::GetPriority() const
     return m_internal->GetPriority();
 }
 
     return m_internal->GetPriority();
 }
 

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

 unsigned long wxThread::GetId() const
 {
     return (unsigned long)m_internal->GetId();
 unsigned long wxThread::GetId() const
 {
     return (unsigned long)m_internal->GetId();

+#endif

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


@@ -866,6 +1126,9 @@ 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);
 
     if ( m_internal->GetState() != STATE_RUNNING )
     wxCriticalSectionLocker lock(m_critsect);
 
     if ( m_internal->GetState() != STATE_RUNNING )


@@ -875,6 +1138,9 @@ wxThreadError wxThread::Pause()
         return wxTHREAD_NOT_RUNNING;
     }
 
         return wxTHREAD_NOT_RUNNING;
     }
 

+    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);
     // just set a flag, the thread will be really paused only during the next
     // call to TestDestroy()
     m_internal->SetState(STATE_PAUSED);


@@ -884,20 +1150,17 @@ wxThreadError wxThread::Pause()
 
 wxThreadError wxThread::Resume()
 {
 
 wxThreadError wxThread::Resume()
 {

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

 
 

-    wxThreadState state = m_internal->GetState();
+    wxCriticalSectionLocker lock(m_critsect);

 
 

-    // the thread might be not actually paused yet - if there were no call to
-    // TestDestroy() since the last call to Pause(), so avoid that
-    // TestDestroy() deadlocks trying to enter m_critsect by leaving it before
-    // calling Resume()
-    m_critsect.Leave();
+    wxThreadState state = m_internal->GetState();

 
     switch ( state )
     {
         case STATE_PAUSED:
 
     switch ( state )
     {
         case STATE_PAUSED:

-            wxLogTrace(TRACE_THREADS, _T("Thread %ld is suspended, resuming."),
+            wxLogTrace(TRACE_THREADS, _T("Thread %ld suspended, resuming."),

                        GetId());
 
             m_internal->Resume();
                        GetId());
 
             m_internal->Resume();


@@ -935,6 +1198,9 @@ wxThread::ExitCode wxThread::Wait()
 
 wxThreadError wxThread::Delete(ExitCode *rc)
 {
 
 wxThreadError wxThread::Delete(ExitCode *rc)
 {

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

     m_critsect.Enter();
     wxThreadState state = m_internal->GetState();
 
     m_critsect.Enter();
     wxThreadState state = m_internal->GetState();
 


@@ -954,6 +1220,12 @@ wxThreadError wxThread::Delete(ExitCode *rc)
     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_EXITED:
             // nothing to do
             break;


@@ -1016,7 +1288,8 @@ wxThreadError wxThread::Kill()
 #if !HAVE_THREAD_CLEANUP_FUNCTIONS
                 ScheduleThreadForDeletion();
 
 #if !HAVE_THREAD_CLEANUP_FUNCTIONS
                 ScheduleThreadForDeletion();
 

-                OnExit();
+                // 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
 
                 DeleteThread(this);
 #endif // HAVE_THREAD_CLEANUP_FUNCTIONS


@@ -1032,6 +1305,10 @@ wxThreadError wxThread::Kill()
 
 void wxThread::Exit(ExitCode status)
 {
 
 void wxThread::Exit(ExitCode status)
 {

+    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
     // 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


@@ -1076,10 +1353,16 @@ void wxThread::Exit(ExitCode status)
 // also test whether we were paused
 bool wxThread::TestDestroy()
 {
 // also test whether we were paused
 bool wxThread::TestDestroy()
 {

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

     m_critsect.Enter();
 
     if ( m_internal->GetState() == STATE_PAUSED )
     {
     m_critsect.Enter();
 
     if ( m_internal->GetState() == STATE_PAUSED )
     {

+        m_internal->SetReallyPaused(TRUE);
+

         // 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
         // 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


@@ -1105,8 +1388,8 @@ wxThread::~wxThread()
     if ( m_internal->GetState() != STATE_EXITED &&
          m_internal->GetState() != STATE_NEW )
     {
     if ( m_internal->GetState() != STATE_EXITED &&
          m_internal->GetState() != STATE_NEW )
     {

-        wxLogDebug(_T("The thread is being destroyed although it is still "
-                      "running! The application may crash."));
+        wxLogDebug(_T("The thread %ld is being destroyed although it is still "
+                      "running! The application may crash."), GetId());

     }
 
     m_critsect.Leave();
     }
 
     m_critsect.Leave();


@@ -1116,6 +1399,17 @@ wxThread::~wxThread()
 
     // 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);
+    }

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


@@ -1186,6 +1480,10 @@ bool wxThreadModule::OnInit()
     gs_mutexGui->Lock();
 #endif // wxUSE_GUI
 
     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;
 }
 
     return TRUE;
 }
 


@@ -1212,7 +1510,10 @@ void wxThreadModule::OnExit()
     // 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(wxT("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++ )
     {


@@ -1268,6 +1569,9 @@ static void DeleteThread(wxThread *This)
                         "one?") );
     }
 
                         "one?") );
     }
 

+    wxLogTrace(TRACE_THREADS, _T("%u scheduled for deletion threads left."),
+               gs_nThreadsBeingDeleted - 1);
+

     if ( !--gs_nThreadsBeingDeleted )
     {
         // no more threads left, signal it
     if ( !--gs_nThreadsBeingDeleted )
     {
         // no more threads left, signal it