[core] improve by two the ttimer resolution

Fixes #8582

Author: ferdymercury

core/base/inc/Rtypes.h

@@ -60,7 +60,7 @@ enum ESysConstants {
    kMAXSIGNALS       = 16,
    kMAXPATHLEN       = 8192,
    kBUFFERSIZE       = 8192,
-   kItimerResolution = 10      // interval-timer resolution in ms
+   kItimerResolution = 5       ///< interval-timer resolution in ms (used for TThread, TTimer, Emit, Connect, etc.)
 };
 
 enum EColor { kWhite   =0,   kBlack    =1,   kGray   =920,

core/base/inc/TTimer.h

@@ -29,7 +29,7 @@
 //      Timeout() signal and call connected slots.                      //
 //                                                                      //
 //  Minimum timeout interval is defined in TSystem::ESysConstants as    //
-//  kItimerResolution (currently 10 ms).                                //
+//  kItimerResolution (currently 5 ms).                                 //
 //                                                                      //
 //  Signal/slots example:                                               //
 //       TTimer *timer = new TTimer();                                  //

core/base/src/TTimer.cxx

@@ -28,8 +28,8 @@ You can use this class in one of the following ways:
      appropriate methods. Then when the time is up it will emit a
      Timeout() signal and call connected slots.
 
-Minimum timeout interval is defined in TSystem::ESysConstants as
-`kItimerResolution` (currently 10 ms).
+Minimum timeout interval is defined in Rtypes.h ESysConstants as
+`kItimerResolution` (currently 5 ms).
 
 Signal/slots example:
 ~~~{.cpp}
@@ -54,7 +54,7 @@ class TSingleShotCleaner : public TTimer {
 private:
    TList  *fGarbage;
 public:
-   TSingleShotCleaner() : TTimer(10, kTRUE) { fGarbage = new TList(); }
+   TSingleShotCleaner() : TTimer(5, kTRUE) { fGarbage = new TList(); }
    ~TSingleShotCleaner() override
    {
       fGarbage->Delete();
@@ -81,7 +81,7 @@ class TSingleShotCleaner : public TTimer {
 ////////////////////////////////////////////////////////////////////////////////
 /// Create timer that times out in ms milliseconds. If milliSec is 0
 /// then the timeout will be the minimum timeout (see TSystem::ESysConstants,
-/// i.e. 10 ms). If mode == kTRUE then the timer is synchronous else
+/// i.e. 5 ms). If mode == kTRUE then the timer is synchronous else
 /// a-synchronous. The default is synchronous. Add a timer to the system
 /// eventloop by calling TurnOn(). Set command to be executed from Notify()
 /// or set the object whose HandleTimer() method will be called via Notify(),

core/thread/inc/TThread.h

@@ -202,10 +202,10 @@ class TThreadCleaner {
 
 class TThreadTimer : public TTimer {
 public:
-   // if this time is less or equal to kItimerResolution, TUnixSystem::DispatchOneEvent i
+   // if this time is less or equal to kItimerResolution, TUnixSystem::DispatchOneEvent
    // can not exit and have its caller react to the other TTimer's actions (like the request
    // to stop the event loop) until there is another type of event.
-   TThreadTimer(Long_t ms = kItimerResolution + 10);
+   TThreadTimer(Long_t ms = kItimerResolution + 5);
    Bool_t Notify() override;
 };