diff --git a/pykd/dbgbreak.cpp b/pykd/dbgbreak.cpp
index ac82a93..3f6088e 100644
--- a/pykd/dbgbreak.cpp
+++ b/pykd/dbgbreak.cpp
@@ -14,34 +14,50 @@ dbgBreakpointClass::breakpointMap       dbgBreakpointClass::m_breakMap;
 
 HRESULT dbgBreakpointClass::onBreakpointEvnet( IDebugBreakpoint*  bp )
 {
-    PyThread_StateSave pyThrdState( dbgExt->getThreadState() ); 
+    PyThread_StateSave pyThreadSave;
 
     try {
 
-        breakpointMap::iterator   it = m_breakMap.find( bp );
-        if ( it != m_breakMap.end() )    
-            return  boost::python::extract<HRESULT>( it->second->m_callback() );
-            
+        breakpointMap::iterator it = m_breakMap.find( bp );
+        if ( it != m_breakMap.end() )
+        {
+            boost::python::object &callback = it->second->m_callback;
+            if (!callback.is_none())
+                return boost::python::extract<HRESULT>( callback() );
+
+            return DEBUG_STATUS_BREAK;
+        }
+
     }
     catch(...)
-    {}
-    
-    return DEBUG_STATUS_NO_CHANGE;               
+    {
+    }
+
+    return DEBUG_STATUS_NO_CHANGE;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 dbgBreakpointClass::dbgBreakpointClass( ULONG64 offset, boost::python::object  &callback )
+    : m_offset(offset)
+    , m_callback(callback)
+    , m_breakpoint(NULL)
 {
-    m_offset = offset;
-    m_breakpoint = NULL;
-    m_callback = callback;
-
-    set();    
+    set();
 }
-  
+
+///////////////////////////////////////////////////////////////////////////////
+
+dbgBreakpointClass::dbgBreakpointClass( ULONG64 offset)
+    : m_offset(offset)
+    , m_breakpoint(NULL)
+{
+    // m_callback is None, see dbgBreakpointClass::onBreakpointEvnet
+    set();
+}
+
 ///////////////////////////////////////////////////////////////////////////////  
-    
+
 dbgBreakpointClass::~dbgBreakpointClass()
 {
     remove();
@@ -53,44 +69,44 @@ bool
 dbgBreakpointClass::set()
 {
     HRESULT             hres;
-    
+
     try {
         
         if ( m_breakpoint )
-            return true;            
-    
+            return true;
+
         hres = dbgExt->control->AddBreakpoint( DEBUG_BREAKPOINT_CODE, DEBUG_ANY_ID, &m_breakpoint );
         if (  FAILED( hres ) )
             throw  DbgException( "IDebugControl::AddBreakpoint  failed" ); 
-    
+
         hres = m_breakpoint->SetOffset( m_offset );
         if (  FAILED( hres ) )
             throw  DbgException( "IDebugBreakpoint::SetOffset  failed" );   
-            
+
         hres = m_breakpoint->SetFlags( DEBUG_BREAKPOINT_ENABLED );
         if (  FAILED( hres ) )
             throw  DbgException( "IDebugBreakpoint::SetFlags  failed" );   
-            
+
         m_breakMap.insert( std::make_pair( m_breakpoint, this ) );
-            
-        return true;                      
+
+        return true;
     } 
-	catch( std::exception  &e )
-	{
-		dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd error: %s\n", e.what() );
-	}
-	catch(...)
-	{
-		dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd unexpected error\n" );
-	}	
-	
-	remove();
-	
-	return false;
+    catch( std::exception  &e )
+    {
+        dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd error: %s\n", e.what() );
+    }
+    catch(...)
+    {
+        dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd unexpected error\n" );
+    }
+
+    remove();
+
+    return false;
 }
-    
+
 ///////////////////////////////////////////////////////////////////////////////    
-    
+
 void
 dbgBreakpointClass::remove()
 {
@@ -111,36 +127,36 @@ dbgBreakpointClass::remove()
 std::string
 dbgBreakpointClass::print() const
 {
-	HRESULT status = S_OK; 
+    HRESULT status = S_OK; 
 
-	try
-	{
-		if (!m_breakpoint)
-			return "not set";
+    try
+    {
+        if (!m_breakpoint)
+            return "not set";
 
-		DEBUG_BREAKPOINT_PARAMETERS params;
-		status = m_breakpoint->GetParameters(&params);
-		if (FAILED(status))
-			throw DbgException("IDebugBreakpoint::GetParameters failed");
+        DEBUG_BREAKPOINT_PARAMETERS params;
+        status = m_breakpoint->GetParameters(&params);
+        if (FAILED(status))
+            throw DbgException("IDebugBreakpoint::GetParameters failed");
 
-		boost::format fmt("%1$2d %2%%3% %4%:*** ");
-		fmt % params.Id 
-		    % (params.Flags & DEBUG_BREAKPOINT_ENABLED ? 'e' : 'd') 
-		    % 'u'
-		    % params.CurrentPassCount;
+        boost::format fmt("%1$2d %2%%3% %4%:*** ");
+        fmt % params.Id 
+            % (params.Flags & DEBUG_BREAKPOINT_ENABLED ? 'e' : 'd') 
+            % 'u'
+            % params.CurrentPassCount;
 
-		return fmt.str();
-	}
-	catch (std::exception & e)
-	{
-		dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd error: %s\n", e.what() );
-	}
-	catch (...)
-	{
-		dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd unexpected error\n" );
-	}
+        return fmt.str();
+    }
+    catch (std::exception & e)
+    {
+        dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd error: %s\n", e.what() );
+    }
+    catch (...)
+    {
+        dbgExt->control->Output( DEBUG_OUTPUT_ERROR, "pykd unexpected error\n" );
+    }
 
-	return "";
+    return "";
 }
 
 ///////////////////////////////////////////////////////////////////////////////
\ No newline at end of file
diff --git a/pykd/dbgbreak.h b/pykd/dbgbreak.h
index e3a2381..a6609e6 100644
--- a/pykd/dbgbreak.h
+++ b/pykd/dbgbreak.h
@@ -10,12 +10,13 @@ class  dbgBreakpointClass {
 public:
 
     dbgBreakpointClass( ULONG64 offset, boost::python::object  &callback );
-    
+    dbgBreakpointClass( ULONG64 offset );
+
     ~dbgBreakpointClass();
-    
+
     bool
     set();
-    
+
     void
     remove();    
 
diff --git a/pykd/dbgcmd.cpp b/pykd/dbgcmd.cpp
index cc89d3b..c25cbd6 100644
--- a/pykd/dbgcmd.cpp
+++ b/pykd/dbgcmd.cpp
@@ -16,13 +16,16 @@ dbgCommand( const std::string &command )
     HRESULT     hres;
 
     OutputReader        outReader(  dbgExt->client );
-   
-    hres = dbgExt->control->Execute( DEBUG_OUTCTL_THIS_CLIENT, command.c_str(), 0 );
+    {
+        PyThread_StateRestore pyThreadRestore;
+
+        hres = dbgExt->control->Execute( DEBUG_OUTCTL_THIS_CLIENT, command.c_str(), 0 );
+    }
     if ( FAILED( hres ) )
         throw  DbgException( "IDebugControl::Execute  failed" ); 
-            
+
     return std::string( outReader.Line() );
-}	
+}
 
 ///////////////////////////////////////////////////////////////////////////////
 
@@ -87,7 +90,7 @@ evaluate( const std::string  &expression )
             &remainderIndex );
             
         if (  FAILED( hres ) )
-            throw  DbgException( "IDebugControl::Evaluate  failed" );             
+            throw  DbgException( "IDebugControl::Evaluate  failed" );
             
         if ( remainderIndex == expression.length() )
             value = debugValue.I64;
@@ -101,7 +104,7 @@ evaluate( const std::string  &expression )
             &remainderIndex );
             
         if (  FAILED( hres ) )
-            throw  DbgException( "IDebugControl::Evaluate  failed" );             
+            throw  DbgException( "IDebugControl::Evaluate  failed" );
             
         if ( remainderIndex == expression.length() )
             value = debugValue.I32;
@@ -118,12 +121,12 @@ breakin()
     HRESULT     hres;
 
     {
-        PyThread_StateRestore       state;
+        PyThread_StateRestore pyThreadRestore;
         hres = dbgExt->control->SetInterrupt( DEBUG_INTERRUPT_ACTIVE );
     }
 
     if ( FAILED( hres ) )
-        throw DbgException( "IDebugControl::SetInterrupt" );            
+        throw DbgException( "IDebugControl::SetInterrupt" );
 }
 
 /////////////////////////////////////////////////////////////////////////////// 
\ No newline at end of file
diff --git a/pykd/dbgcmd.h b/pykd/dbgcmd.h
index d6e5bae..5aa8817 100644
--- a/pykd/dbgcmd.h
+++ b/pykd/dbgcmd.h
@@ -16,29 +16,27 @@ setExecutionStatus()
     HRESULT     hres;
 
     hres = dbgExt->control->SetExecutionStatus( status );
-        
+
     if ( FAILED( hres ) )
         throw DbgException( "IDebugControl::SetExecutionStatus failed" );
-            
-    ULONG    currentStatus;                
-          
+
+    ULONG    currentStatus;
+
     do {
         
         {
-            PyThread_StateRestore   state(dbgExt->getThreadState());
-            
+            PyThread_StateRestore pyThreadRestore;
             hres = dbgExt->control->WaitForEvent( 0, INFINITE );
-        
         }
-    
+
         if ( FAILED( hres ) )
             throw  DbgException( "IDebugControl::WaitForEvent  failed" ); 
                         
         hres = dbgExt->control->GetExecutionStatus( &currentStatus );
-            
+
         if ( FAILED( hres ) )
             throw  DbgException( "IDebugControl::GetExecutionStatus  failed" ); 
-            
+
     } while( currentStatus != DEBUG_STATUS_BREAK && currentStatus != DEBUG_STATUS_NO_DEBUGGEE );
 
 }
diff --git a/pykd/dbgevent.cpp b/pykd/dbgevent.cpp
index 2d02b98..4405485 100644
--- a/pykd/dbgevent.cpp
+++ b/pykd/dbgevent.cpp
@@ -41,10 +41,10 @@ HRESULT debugEvent::GetInterestMask(
     *Mask = 0;
 
     *Mask |= DEBUG_EVENT_LOAD_MODULE;
-    *Mask |= DEBUG_EVENT_UNLOAD_MODULE;  
+    *Mask |= DEBUG_EVENT_UNLOAD_MODULE;
     *Mask |= DEBUG_EVENT_SESSION_STATUS;
-        
-    return S_OK;     
+
+    return S_OK;
 }
 
 ///////////////////////////////////////////////////////////////////////////////////
@@ -69,8 +69,7 @@ HRESULT debugEvent::LoadModule(
     dbgModuleClass module(moduleName, moduleBase, moduleSize);
     silentMode.reset(); 
 
-    PyThread_StateSave pyThrdState( dbgExt->getThreadState() ); 
-
+    PyThread_StateSave pyThreadSave;
     return onLoadModule( module );
 }
 
@@ -91,8 +90,7 @@ HRESULT debugEvent::UnloadModule(
     dbgModuleClass module(moduleName, moduleBase, moduleSize);
     silentMode.reset(); 
 
-    PyThread_StateSave pyThrdState( dbgExt->getThreadState() ); 
-
+    PyThread_StateSave pyThreadSave;
     return onUnloadModule( module );
 }
 
@@ -102,8 +100,7 @@ HRESULT debugEvent::SessionStatus(
         __in ULONG  Status
 )
 {
-    PyThread_StateSave pyThrdState( dbgExt->getThreadState() ); 
-
+    PyThread_StateSave pyThreadSave;
     return onChangeSessionStatus( Status );
 }
 
@@ -114,8 +111,7 @@ HRESULT debugEvent::ChangeDebuggeeState(
         __in ULONG64 Argument
 )
 {
-    PyThread_StateSave pyThrdState( dbgExt->getThreadState() ); 
-
+    PyThread_StateSave pyThreadSave;
     return onChangeDebugeeState();
 }
 
diff --git a/pykd/dbgevent.h b/pykd/dbgevent.h
index 7ca1c09..c8cd9fc 100644
--- a/pykd/dbgevent.h
+++ b/pykd/dbgevent.h
@@ -4,15 +4,16 @@
 
 #include "dbgeventcb.h"
 #include "dbgmodule.h"
+#include "pyaux.h"
 
 /////////////////////////////////////////////////////////////////////////////////
 
 class debugEvent : public DebugBaseEventCallbacks
 {
 public:
-    
+
     debugEvent();
-    
+
     virtual ~debugEvent();
 
     virtual ULONG onLoadModule(const dbgModuleClass &/* module */)  = 0;
@@ -30,8 +31,8 @@ private:
 
     STDMETHOD(GetInterestMask)(
         __out PULONG Mask
-    );          
-    
+    );
+
     STDMETHOD(LoadModule)(
         __in ULONG64 ImageFileHandle,
         __in ULONG64 BaseOffset,
@@ -46,18 +47,18 @@ private:
         __in PCSTR ImageBaseName,
         __in ULONG64 BaseOffset
     );  
-    
+
     STDMETHOD(SessionStatus)(
         __in ULONG  Status
     );
-    
+
     STDMETHOD(ChangeDebuggeeState)(
         __in ULONG  Flags,
         __in ULONG64 Argument );
-    
+
 private:
 
-    IDebugClient       *m_debugClient;         
+    IDebugClient       *m_debugClient;
 };
 
 /////////////////////////////////////////////////////////////////////////////////
@@ -65,9 +66,9 @@ private:
 class debugEventWrap : public boost::python::wrapper<debugEvent>, public debugEvent
 {
 
-public:   
- 
-    
+public:
+
+
     ULONG onLoadModule(const dbgModuleClass &module) {
         return handler<const dbgModuleClass &>("onLoadModule", module );
     }
@@ -75,33 +76,33 @@ public:
     ULONG onUnloadModule(const dbgModuleClass &module) {
         return handler<const dbgModuleClass &>("onUnloadModule", module );
     }
-    
+
     ULONG onChangeSessionStatus( ULONG status ) {
         return handler( "onChangeSessionStatus", status );
-    }  
-    
+    }
+
     ULONG onChangeDebugeeState() {
-        return handler( "onChangeDebugeeState" );    
-    }      
-    
-private:    
-    
+        return handler( "onChangeDebugeeState" );
+    }
+
+private:
+
     template<typename Arg1Type>
     ULONG handler( const char* handlerName, Arg1Type  arg1 )
     {
-        if (boost::python::override     pythonHandler = get_override( handlerName ))
+        if (boost::python::override pythonHandler = get_override( handlerName ))
             return pythonHandler(arg1);
-            
+
         return DEBUG_STATUS_NO_CHANGE;
-    }      
+    }
 
     ULONG handler( const char* handlerName )
     {
-        if (boost::python::override     pythonHandler = get_override( handlerName ))
+        if (boost::python::override pythonHandler = get_override( handlerName ))
             return pythonHandler();
-            
+
         return DEBUG_STATUS_NO_CHANGE;
-    }      
+    }
 };
 
 /////////////////////////////////////////////////////////////////////////////////
diff --git a/pykd/dbgext.cpp b/pykd/dbgext.cpp
index 24ade92..cde7b69 100644
--- a/pykd/dbgext.cpp
+++ b/pykd/dbgext.cpp
@@ -38,6 +38,9 @@ DbgExt    *dbgExt = NULL;
 // глобальный клиент 
 dbgClient    g_dbgClient;
 
+// контескт исполнения нити питона
+__declspec( thread ) PyThreadStatePtr ptrPyThreadState = NULL;
+
 //////////////////////////////////////////////////////////////////////////////
 
 BOOST_PYTHON_FUNCTION_OVERLOADS( dprint, dbgPrint::dprint, 1, 2 )
@@ -340,7 +343,9 @@ BOOST_PYTHON_MODULE( pykd )
     boost::python::class_<dbgBreakpointClass>( "bp",
          "Class representing breakpoint",
          boost::python::init<ULONG64,boost::python::object&>( boost::python::args("offset", "callback"), 
-            "dbgBreakpointClass constructor" ) )
+         "Break point: user callback" ) )
+        .def( boost::python::init< ULONG64 >( boost::python::args("offset"), 
+            "Break point constructor: always break" ) )
         .def( "set", &dbgBreakpointClass::set,
             "Set a breakpoint at the specified address" )
         .def( "remove", &dbgBreakpointClass::remove,
@@ -703,7 +708,6 @@ DebugExtensionUninitialize()
 }
 
 DbgExt::DbgExt( IDebugClient4 *masterClient ) 
-    : m_threadState(NULL)
 {
     client = NULL;
     masterClient->QueryInterface( __uuidof(IDebugClient), (void **)&client );
@@ -753,21 +757,24 @@ DbgExt::DbgExt( IDebugClient4 *masterClient )
 
 DbgExt::~DbgExt()
 {
+    BOOST_ASSERT(dbgExt == this);
+    dbgExt = m_previosExt;
+
     if ( client )
         client->Release();
-        
+
     if ( client4 )
         client4->Release();
-        
+
     if ( client5 )
         client5->Release();
-        
+
     if ( control )
         control->Release();
-        
+
     if ( control4 )
         control4->Release();
-        
+
     if ( registers )
         registers->Release();
             
@@ -776,26 +783,24 @@ DbgExt::~DbgExt()
         
     if ( symbols2 )
         symbols2->Release();
-        
+
     if ( symbols3 )
         symbols3->Release();
-        
+
     if ( dataSpaces )
         dataSpaces->Release();
-        
+
     if ( dataSpaces4 )
         dataSpaces4->Release();
-        
+
     if ( advanced2 )
         advanced2->Release();
-        
+
     if ( system )
         system->Release();
-        
+
     if ( system2 )
         system2->Release();
-        
-    dbgExt = m_previosExt;
 }
 
 /////////////////////////////////////////////////////////////////////////////////    
diff --git a/pykd/dbgext.h b/pykd/dbgext.h
index aa33c2e..39c0f55 100644
--- a/pykd/dbgext.h
+++ b/pykd/dbgext.h
@@ -32,16 +32,9 @@ public:
 
     ~DbgExt();
 
-    PyThreadState**
-    getThreadState() {
-        return &m_threadState;
-    }
-    
-private:    
+private:
 
     DbgExt      *m_previosExt;
-
-    PyThreadState   *m_threadState;
 };
 
 extern DbgExt    *dbgExt;
diff --git a/pykd/pyaux.h b/pykd/pyaux.h
index cf83a13..843dc31 100644
--- a/pykd/pyaux.h
+++ b/pykd/pyaux.h
@@ -2,6 +2,9 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
+typedef PyThreadState *PyThreadStatePtr;
+extern __declspec( thread ) PyThreadStatePtr ptrPyThreadState;
+
 //  --> call back 
 //  { PyThread_StateSave  state( winext->getThreadState() );
 //    do_callback();
@@ -15,58 +18,40 @@ class PyThread_StateSave {
 
 public:
 
-    PyThread_StateSave( PyThreadState  **state ) 
-        : m_state(NULL)
+    PyThread_StateSave() 
+        : m_bRestored(false)
     {
-        if ( *state )
+        if (ptrPyThreadState)
         {
-            m_state = state;
-            PyEval_RestoreThread( *m_state );
+            PyEval_RestoreThread( ptrPyThreadState );
+            m_bRestored = true;
         }
     }
 
     ~PyThread_StateSave() {
-        if ( m_state )
-            *m_state =PyEval_SaveThread();
+        if ( m_bRestored )
+            ptrPyThreadState = PyEval_SaveThread();
     }
 
 private:
-
-    PyThreadState       **m_state;
+    bool m_bRestored;
 };
 
 // { PyThread_StateRestore   state;
 //   long_or_block_opreration();
 // }
 
-class PyThread_StateRestore {
-
+class PyThread_StateRestore
+{
 public:
 
-    explicit PyThread_StateRestore() {
-        m_state = &m_ownState;
-        *m_state =PyEval_SaveThread();
-    }
-
-    PyThread_StateRestore( PyThreadState  **state ) {
-        if ( *state )
-        {
-            m_state = state;                
-            *m_state =PyEval_SaveThread();
-        }
+    PyThread_StateRestore() {
+        ptrPyThreadState = PyEval_SaveThread();
     }
 
     ~PyThread_StateRestore() {
-        if (*m_state)
-            PyEval_RestoreThread( *m_state );
+        PyEval_RestoreThread( ptrPyThreadState );
     }
-
-private:
-
-    PyThreadState       **m_state;
-
-    PyThreadState       *m_ownState;
-
 };
 
 ///////////////////////////////////////////////////////////////////////////////
\ No newline at end of file
diff --git a/samples/goLib.py b/samples/goLib.py
new file mode 100644
index 0000000..9fa3d69
--- /dev/null
+++ b/samples/goLib.py
@@ -0,0 +1,34 @@
+"""
+Using bp class without callback
+"""
+
+from pykd import *
+
+
+if __name__ == "__main__":
+
+  if not isKernelDebugging():
+
+    if not isWindbgExt():
+      startProcess("calc.exe")
+
+    kernel32 = loadModule("kernel32")
+
+    bpA = bp( kernel32.LoadLibraryA )
+    bpW = bp( kernel32.LoadLibraryW )
+
+    go()
+    dbgCommand("gu")
+
+    dprintln( dbgCommand("!dlls @$retreg") )
+
+  else:
+
+    dprintln("Script for user mode only")
+
+
+
+
+
+
+