Fixes high CPU load

ChangeLog

@@ -1,3 +1,8 @@
+2020-08-15  Markus Gans  <guru.mail@muenster.de>
+	* The call of the function setNonBlockingRead() resulted in 
+	  a high CPU load in idle mode. 
+	  Thanks to Pavel Stehule for reporting this problem.
+
 2020-08-11  Markus Gans  <guru.mail@muenster.de>
 	* New callback backend was implemented. Callback functions with any 
 	  number of arguments are now possible.

src/fapplication.cpp

@@ -20,9 +20,11 @@
 * <http://www.gnu.org/licenses/>.                                      *
 ***********************************************************************/
 
+#include <chrono>
 #include <fstream>
 #include <memory>
 #include <string>
+#include <thread>
 
 #include "final/fapplication.h"
 #include "final/fevent.h"
@@ -61,7 +63,8 @@ FMouseControl* FApplication::mouse           {nullptr};  // mouse control
 int            FApplication::loop_level      {0};        // event loop level
 int            FApplication::quit_code       {EXIT_SUCCESS};
 bool           FApplication::quit_now        {false};
-
+uInt64         FApplication::next_event_wait{50000};     // preset to 50 ms
+struct timeval FApplication::time_last_event{};
 
 //----------------------------------------------------------------------
 // class FApplication
@@ -330,6 +333,7 @@ void FApplication::closeConfirmationDialog (FWidget* w, FCloseEvent* ev)
 void FApplication::processExternalUserEvent()
 {
   // This method can be overloaded and replaced by own code
+  std::this_thread::sleep_for(std::chrono::milliseconds(10));
 }
 
 
@@ -337,6 +341,10 @@ void FApplication::processExternalUserEvent()
 //----------------------------------------------------------------------
 void FApplication::init()
 {
+  // Initialize the last event time
+  time_last_event.tv_sec = 0;
+  time_last_event.tv_usec = 0;
+
   // Initialize keyboard
   keyboard = FTerm::getFKeyboard();
 
@@ -1207,10 +1215,10 @@ void FApplication::processResizeEvent() const
 //----------------------------------------------------------------------
 void FApplication::processCloseWidget()
 {
-  setTerminalUpdates (FVTerm::stop_terminal_updates);
+  if ( ! getWidgetCloseList() || getWidgetCloseList()->empty() )
+    return;
 
-  if ( getWidgetCloseList() && ! getWidgetCloseList()->empty() )
+  setTerminalUpdates (FVTerm::stop_terminal_updates);
-  {
   auto iter = getWidgetCloseList()->begin();
 
   while ( iter != getWidgetCloseList()->end() && *iter )
@@ -1220,8 +1228,6 @@ void FApplication::processCloseWidget()
   }
 
   getWidgetCloseList()->clear();
-  }
-
   setTerminalUpdates (FVTerm::start_terminal_updates);
 }
 
@@ -1243,12 +1249,18 @@ bool FApplication::processNextEvent()
 {
   uInt num_events{0};
 
+  if ( isNextEventTimeout() )
+  {
+    FObject::getCurrentTime (&time_last_event);
     processKeyboardEvent();
     processMouseEvent();
     processResizeEvent();
     processTerminalUpdate();
     processCloseWidget();
     processLogger();
+    updateTerminal();
+  }
+
   processExternalUserEvent();
 
   sendQueuedEvents();
@@ -1318,4 +1330,10 @@ bool FApplication::isEventProcessable ( const FObject* receiver
   return true;
 }
 
+//----------------------------------------------------------------------
+bool FApplication::isNextEventTimeout()
+{
+  return FObject::isTimeout (&time_last_event, next_event_wait);
+}
+
 }  // namespace finalcut

src/fkeyboard.cpp

@@ -44,7 +44,9 @@ namespace finalcut
 // static class attributes
 uInt64 FKeyboard::read_blocking_time{100000};  // preset to 100 ms
 uInt64 FKeyboard::key_timeout{100000};         // preset to 100 ms
+uInt64 FKeyboard::interval_timeout{75000};     // preset to 75 ms
 struct timeval FKeyboard::time_keypressed{};
+struct timeval FKeyboard::time_last_request{};
 
 #if defined(__linux__)
   FTermLinux* FKeyboard::linux{nullptr};
@@ -62,6 +64,8 @@ FKeyboard::FKeyboard()
   // Initialize keyboard values
   time_keypressed.tv_sec = 0;
   time_keypressed.tv_usec = 0;
+  time_last_request.tv_sec = 0;
+  time_last_request.tv_usec = 0;
 
   // Get the stdin file status flags
   stdin_status_flags = fcntl(FTermios::getStdIn(), F_GETFL);
@@ -117,6 +121,9 @@ bool& FKeyboard::unprocessedInput()
 //----------------------------------------------------------------------
 bool FKeyboard::isKeyPressed() const
 {
+  if ( ! isIntervalTimeout() )
+    return false;
+
   fd_set ifds{};
   struct timeval tv{};
   const int stdin_no = FTermios::getStdIn();
@@ -125,6 +132,7 @@ bool FKeyboard::isKeyPressed() const
   FD_SET(stdin_no, &ifds);
   tv.tv_sec  = 0;
   tv.tv_usec = suseconds_t(read_blocking_time);  // preset to 100 ms
+  FObject::getCurrentTime (&time_last_request);
   const int result = select (stdin_no + 1, &ifds, nullptr, nullptr, &tv);
 
   if ( result > 0 && FD_ISSET(stdin_no, &ifds) )
@@ -351,11 +359,17 @@ bool FKeyboard::setNonBlockingInput (bool enable)
 }
 
 //----------------------------------------------------------------------
-bool FKeyboard::isKeypressTimeout()
+inline bool FKeyboard::isKeypressTimeout()
 {
   return FObject::isTimeout (&time_keypressed, key_timeout);
 }
 
+//----------------------------------------------------------------------
+inline bool FKeyboard::isIntervalTimeout()
+{
+  return FObject::isTimeout (&time_last_request, interval_timeout);
+}
+
 //----------------------------------------------------------------------
 FKey FKeyboard::UTF8decode (const char utf8[]) const
 {

src/fmessagebox.cpp

@@ -278,7 +278,7 @@ inline void FMessageBox::deallocation()
 //----------------------------------------------------------------------
 inline void FMessageBox::initCallbacks()
 {
-  if ( button_digit[0] != 0 )
+  if ( button[0] && button_digit[0] != 0 )
   {
     button[0]->addCallback
     (
@@ -288,7 +288,7 @@ inline void FMessageBox::initCallbacks()
     );
   }
 
-  if ( button_digit[1] != 0 )
+  if ( button[1] && button_digit[1] != 0 )
   {
     button[1]->addCallback
     (
@@ -298,7 +298,7 @@ inline void FMessageBox::initCallbacks()
     );
   }
 
-  if ( button_digit[2] != 0 )
+  if ( button[2] && button_digit[2] != 0 )
   {
     button[2]->addCallback
     (

src/fspinbox.cpp

@@ -429,7 +429,7 @@ void FSpinBox::forceFocus()
 }
 
 //----------------------------------------------------------------------
-void FSpinBox::cb_inputFieldActivate()
+void FSpinBox::cb_inputFieldActivate() const
 {
   processActivate();
 }

src/fstring.cpp

@@ -380,19 +380,7 @@ const FString& FString::operator () () const
 //----------------------------------------------------------------------
 std::size_t FString::getUTF8length() const
 {
-  if ( ! string )
+  return length;
-    return 0;
-
-  std::size_t len{0};
-  const char* s = c_str();
-
-  while ( *s )
-  {
-    len += std::size_t((*s & 0xc0) != 0x80);
-    s++;
-  }
-
-  return len;
 }
 
 //----------------------------------------------------------------------

src/fvterm.cpp

@@ -56,11 +56,13 @@ bool                 FVTerm::force_terminal_update{false};
 bool                 FVTerm::no_terminal_updates{false};
 bool                 FVTerm::cursor_hideable{false};
 int                  FVTerm::skipped_terminal_update{};
+uInt64               FVTerm::term_size_check_timeout{500000};  // 500 ms
 uInt                 FVTerm::erase_char_length{};
 uInt                 FVTerm::repeat_char_length{};
 uInt                 FVTerm::clr_bol_length{};
 uInt                 FVTerm::clr_eol_length{};
 uInt                 FVTerm::cursor_address_length{};
+struct timeval       FVTerm::last_term_size_check{};
 std::queue<int>*     FVTerm::output_buffer{nullptr};
 FPoint*              FVTerm::term_pos{nullptr};
 FSystem*             FVTerm::fsystem{nullptr};
@@ -1968,6 +1970,10 @@ void FVTerm::init()
   createArea (term_geometry, shadow_size, vdesktop);
   vdesktop->visible = true;
   active_area = vdesktop;
+
+  // Initialize the last terminal size check time
+  last_term_size_check.tv_sec = 0;
+  last_term_size_check.tv_usec = 0;
 }
 
 //----------------------------------------------------------------------
@@ -2899,6 +2905,11 @@ bool FVTerm::isInsideTerminal (const FPoint& pos) const
 //----------------------------------------------------------------------
 inline bool FVTerm::isTermSizeChanged() const
 {
+  if ( ! isTermSizeCheckTimeout() )
+    return false;
+
+  FObject::getCurrentTime (&last_term_size_check);
+
   const auto& data = FTerm::getFTermData();
 
   if ( ! data )
@@ -2915,6 +2926,12 @@ inline bool FVTerm::isTermSizeChanged() const
   return false;
 }
 
+//----------------------------------------------------------------------
+inline bool FVTerm::isTermSizeCheckTimeout()
+{
+  return FObject::isTimeout (&last_term_size_check, term_size_check_timeout);
+}
+
 //----------------------------------------------------------------------
 inline void FVTerm::markAsPrinted (uInt pos, uInt line)
 {

src/include/final/fapplication.h

@@ -198,6 +198,7 @@ class FApplication : public FWidget
     bool                  processNextEvent();
     void                  performTimerAction (FObject*, FEvent*) override;
     static bool           isEventProcessable (const FObject*, const FEvent*);
+    static bool           isNextEventTimeout();
 
     // Data members
     int                   app_argc{};
@@ -205,6 +206,8 @@ class FApplication : public FWidget
     uInt64                key_timeout{100000};        // 100 ms
     uInt64                dblclick_interval{500000};  // 500 ms
     FEventQueue           event_queue{};
+    static uInt64         next_event_wait;
+    static timeval        time_last_event;
     static int            quit_code;
     static bool           quit_now;
     static int            loop_level;

src/include/final/fcallback.h

@@ -55,13 +55,20 @@ struct FCallbackData
   FCallbackData()
   { }
 
-  FCallbackData (const FString& s, FWidget* i, void* m, const FCall& c)
+  template<typename FuncPtr>
+  FCallbackData (const FString& s, FWidget* i, FuncPtr m, const FCall& c)
     : cb_signal(s)
     , cb_instance(i)
     , cb_function_ptr(m)
     , cb_function(c)
   { }
 
+  FCallbackData (const FCallbackData&) = default;
+  FCallbackData (FCallbackData&&) = default;
+
+  FCallbackData& operator = (const FCallbackData&) = default;
+  FCallbackData& operator = (FCallbackData&&) = default;
+
   // Data members
   FString   cb_signal{};
   FWidget*  cb_instance{};
@@ -77,6 +84,53 @@ struct FCallbackData
 class FCallback
 {
   public:
+    // Using-declaration
+    template<typename T>
+    using ObjectPointer =
+        typename std::enable_if< ! std::is_member_function_pointer<T>::value
+                              && ! std::is_function<typename std::remove_pointer<T>::type>::value
+                              && ! std::is_function<T>::value
+                              && std::is_pointer<T>::value
+                              && std::is_object<T>::value
+                              && ! std::is_class<T>::value
+                              , std::nullptr_t >;
+    template<typename T>
+    using ClassObject =
+        typename std::enable_if< ! std::is_member_function_pointer<T>::value
+                              && ! std::is_function<typename std::remove_pointer<T>::type>::value
+                              && ! std::is_function<T>::value
+                              && ! std::is_pointer<T>::value
+                              && std::is_object<T>::value
+                              && std::is_class<T>::value
+                              , std::nullptr_t >;
+    template<typename T>
+    using MemberFunctionPointer =
+        typename std::enable_if< std::is_member_function_pointer<T>::value
+                              && ! std::is_function<typename std::remove_pointer<T>::type>::value
+                              && ! std::is_function<T>::value
+                              && ! std::is_pointer<T>::value
+                              && std::is_object<T>::value
+                              && ! std::is_class<T>::value
+                              , std::nullptr_t >;
+    template<typename T>
+    using FunctionPointer =
+        typename std::enable_if< ! std::is_member_function_pointer<T>::value
+                              && std::is_function<typename std::remove_pointer<T>::type>::value
+                              && ! std::is_function<T>::value
+                              && std::is_pointer<T>::value
+                              && std::is_object<T>::value
+                              && ! std::is_class<T>::value
+                              , std::nullptr_t >;
+    template<typename T>
+    using FunctionReference =
+        typename std::enable_if< ! std::is_member_function_pointer<T>::value
+                              && std::is_function<typename std::remove_pointer<T>::type>::value
+                              && std::is_function<T>::value
+                              && ! std::is_pointer<T>::value
+                              && ! std::is_object<T>::value
+                              && ! std::is_class<T>::value
+                              , std::nullptr_t >;
+
     // Constructors
     FCallback();
 
@@ -103,19 +157,8 @@ class FCallback
     // Methods
     template<typename Object
            , typename Function
-           , typename std::enable_if< ! std::is_member_function_pointer<Object>::value
+           , typename ObjectPointer<Object>::type = nullptr
-                                   && ! std::is_function<typename std::remove_pointer<Object>::type>::value
+           , typename MemberFunctionPointer<Function>::type = nullptr
-                                   && ! std::is_function<Object>::value
-                                   && std::is_pointer<Object>::value
-                                   && std::is_object<Object>::value
-                                   && ! std::is_class<Object>::value
-                                   && std::is_member_function_pointer<Function>::value
-                                   && ! std::is_function<typename std::remove_pointer<Function>::type>::value
-                                   && ! std::is_function<Function>::value
-                                   && ! std::is_pointer<Function>::value
-                                   && std::is_object<Function>::value
-                                   && ! std::is_class<Function>::value
-                                   , std::nullptr_t >::type = nullptr
            , typename... Args>
     void addCallback ( const FString& cb_signal
                      , Object&&       cb_instance
@@ -125,29 +168,17 @@ class FCallback
       // Add a member function pointer as callback
 
       Object instance = cb_instance;
-      auto member = reinterpret_cast<void*>(std::addressof(cb_member));
       auto fn = std::bind ( std::forward<Function>(cb_member)
                           , std::forward<Object>(cb_instance)
                           , std::forward<Args>(args)... );
-      FCallbackData obj{ cb_signal, instance, member, fn };
+      FCallbackData obj{ cb_signal, instance, nullptr, fn };
       callback_objects.push_back(obj);
     }
 
     template<typename Object
            , typename Function
-           , typename std::enable_if< ! std::is_member_function_pointer<Object>::value
+           , typename ObjectPointer<Object>::type = nullptr
-                                   && ! std::is_function<typename std::remove_pointer<Object>::type>::value
+           , typename ClassObject<Function>::type = nullptr
-                                   && ! std::is_function<Object>::value
-                                   && std::is_pointer<Object>::value
-                                   && std::is_object<Object>::value
-                                   && ! std::is_class<Object>::value
-                                   && ! std::is_member_function_pointer<Function>::value
-                                   && ! std::is_function<typename std::remove_pointer<Function>::type>::value
-                                   && ! std::is_function<Function>::value
-                                   && ! std::is_pointer<Function>::value
-                                   && std::is_object<Function>::value
-                                   && std::is_class<Function>::value
-                                   , std::nullptr_t >::type = nullptr
            , typename... Args>
     void addCallback ( const FString& cb_signal
                      , Object&&       cb_instance
@@ -162,13 +193,7 @@ class FCallback
     }
 
     template<typename Function
-           , typename std::enable_if< ! std::is_member_function_pointer<Function>::value
+           , typename ClassObject<Function>::type = nullptr
-                                   && ! std::is_function<typename std::remove_pointer<Function>::type>::value
-                                   && ! std::is_function<Function>::value
-                                   && ! std::is_pointer<Function>::value
-                                   && std::is_object<Function>::value
-                                   && std::is_class<Function>::value
-                                   , std::nullptr_t >::type = nullptr
            , typename... Args>
     void addCallback ( const FString& cb_signal
                      , Function&&     cb_function
@@ -183,13 +208,7 @@ class FCallback
     }
 
     template<typename Function
-           , typename std::enable_if< ! std::is_member_function_pointer<Function>::value
+           , typename FunctionReference<Function>::type = nullptr
-                                   && std::is_function<typename std::remove_pointer<Function>::type>::value
-                                   && std::is_function<Function>::value
-                                   && ! std::is_pointer<Function>::value
-                                   && ! std::is_object<Function>::value
-                                   && ! std::is_class<Function>::value
-                                   , std::nullptr_t >::type = nullptr
            , typename... Args>
     void addCallback ( const FString& cb_signal
                      , Function&      cb_function
@@ -204,13 +223,7 @@ class FCallback
     }
 
     template<typename Function
-           , typename std::enable_if< ! std::is_member_function_pointer<Function>::value
+           , typename FunctionPointer<Function>::type = nullptr
-                                   && std::is_function<typename std::remove_pointer<Function>::type>::value
-                                   && ! std::is_function<Function>::value
-                                   && std::is_pointer<Function>::value
-                                   && std::is_object<Function>::value
-                                   && ! std::is_class<Function>::value
-                                   , std::nullptr_t >::type = nullptr
            , typename... Args>
     void addCallback ( const FString& cb_signal
                      , Function&&     cb_function
@@ -226,13 +239,7 @@ class FCallback
     }
 
     template<typename Function
-           , typename std::enable_if< ! std::is_member_function_pointer<Function>::value
+           , typename ClassObject<Function>::type = nullptr
-                                   && ! std::is_function<typename std::remove_pointer<Function>::type>::value
-                                   && ! std::is_function<Function>::value
-                                   && ! std::is_pointer<Function>::value
-                                   && std::is_object<Function>::value
-                                   && std::is_class<Function>::value
-                                   , std::nullptr_t >::type = nullptr
            , typename... Args>
     void addCallback ( const FString& cb_signal
                      , Function&      cb_function
@@ -246,13 +253,7 @@ class FCallback
     }
 
     template<typename Object
-           , typename std::enable_if< ! std::is_member_function_pointer<Object>::value
+           , typename ObjectPointer<Object>::type = nullptr>
-                                   && ! std::is_function<typename std::remove_pointer<Object>::type>::value
-                                   && ! std::is_function<Object>::value
-                                   && std::is_pointer<Object>::value
-                                   && std::is_object<Object>::value
-                                   && ! std::is_class<Object>::value
-                                   , std::nullptr_t >::type = nullptr >
     void delCallback (Object&& cb_instance)
     {
       // Deletes entries with the given instance from the callback list
@@ -290,13 +291,7 @@ class FCallback
     }
 
     template<typename Object
-           , typename std::enable_if< ! std::is_member_function_pointer<Object>::value
+           , typename ObjectPointer<Object>::type = nullptr>
-                                   && ! std::is_function<typename std::remove_pointer<Object>::type>::value
-                                   && ! std::is_function<Object>::value
-                                   && std::is_pointer<Object>::value
-                                   && std::is_object<Object>::value
-                                   && ! std::is_class<Object>::value
-                                   , std::nullptr_t >::type = nullptr >
     void delCallback (const FString& cb_signal, Object&& cb_instance)
     {
       // Deletes entries with the given signal and instance
@@ -318,13 +313,7 @@ class FCallback
     }
 
     template<typename FunctionPtr
-           , typename std::enable_if< ! std::is_member_function_pointer<FunctionPtr>::value
+           , typename FunctionPointer<FunctionPtr>::type = nullptr>
-                                   && std::is_function<typename std::remove_pointer<FunctionPtr>::type>::value
-                                   && ! std::is_function<FunctionPtr>::value
-                                   && std::is_pointer<FunctionPtr>::value
-                                   && std::is_object<FunctionPtr>::value
-                                   && ! std::is_class<FunctionPtr>::value
-                                   , std::nullptr_t >::type = nullptr >
     void delCallback (FunctionPtr&& cb_func_ptr)
     {
       // Deletes entries with the given function pointer
@@ -346,13 +335,7 @@ class FCallback
     }
 
     template<typename Function
-           , typename std::enable_if< ! std::is_member_function_pointer<Function>::value
+           , typename FunctionReference<Function>::type = nullptr>
-                                   && std::is_function<typename std::remove_pointer<Function>::type>::value
-                                   && std::is_function<Function>::value
-                                   && ! std::is_pointer<Function>::value
-                                   && ! std::is_object<Function>::value
-                                   && ! std::is_class<Function>::value
-                                   , std::nullptr_t >::type = nullptr >
     void delCallback (Function& cb_function)
     {
       // Deletes entries with the given function from the callback list

src/include/final/fkeyboard.h

@@ -148,6 +148,7 @@ class FKeyboard final
 
     // Inquiry
     static bool           isKeypressTimeout();
+    static bool           isIntervalTimeout();
 
     // Methods
     FKey                  UTF8decode (const char[]) const;
@@ -171,8 +172,10 @@ class FKeyboard final
 #endif
 
     static timeval        time_keypressed;
+    static timeval        time_last_request;
     static uInt64         read_blocking_time;
     static uInt64         key_timeout;
+    static uInt64         interval_timeout;
     fc::FKeyMap*          key_map{nullptr};
     FKey                  key{0};
     uChar                 read_character{};

src/include/final/fspinbox.h

@@ -140,7 +140,7 @@ class FSpinBox : public FWidget
     void                forceFocus();
 
     // Callback methods
-    void                cb_inputFieldActivate();
+    void                cb_inputFieldActivate() const;
     void                cb_inputFieldChange (const FLineEdit&);
 
     // Data members

src/include/final/fvterm.h

@@ -408,6 +408,7 @@ class FVTerm
     bool                  updateTerminalCursor() const;
     bool                  isInsideTerminal (const FPoint&) const;
     bool                  isTermSizeChanged() const;
+    static bool           isTermSizeCheckTimeout();
     static void           markAsPrinted (uInt, uInt);
     static void           markAsPrinted (uInt, uInt, uInt);
     static void           newFontChanges (FChar*&);
@@ -437,10 +438,12 @@ class FVTerm
     static FChar            i_ch;      // inherit background character
     static FPoint*          term_pos;  // terminal cursor position
     static FKeyboard*       keyboard;
+    static timeval          last_term_size_check;
     static bool             terminal_update_complete;
     static bool             terminal_update_pending;
     static bool             force_terminal_update;
     static bool             no_terminal_updates;
+    static uInt64           term_size_check_timeout;
     static int              skipped_terminal_update;
     static uInt             erase_char_length;
     static uInt             repeat_char_length;