Added DIAG macros for countdown logging

Also for tracking memory use and for timing.

src/Diags.cpp

@@ -0,0 +1,91 @@
+
+/**********************************************************************
+
+  Audacity: A Digital Audio Editor
+
+  Diags.cpp
+
+  James Crook
+
+
+********************************************************************//**
+
+\class Diags
+\brief Processing of the macros for recording bad events or performance 
+monitoring.
+
+The idea of these macros is that we can include them in release 
+code at no risk.  They 
+
+a) have almost zero performance impact.
+b) will not flood the log with events.
+
+This is achieved by a countdown which stops recording in the log
+when the countdown is finished.  The countdwon continues to 
+count down so that we track how many times the event happens.
+
+
+*//********************************************************************/
+
+
+#include "Audacity.h"
+#include <wx/defs.h>
+#include <wx/hash.h>
+#include <wx/intl.h>
+#include <wx/log.h>
+
+#include <wx/stopwatch.h>
+#include "Diags.h"
+#include "Experimental.h"
+
+static wxStopWatch MasterWatch;
+static bool bStopWatchStarted = false;
+
+void diagnostics_do_diag( t_diag_struct * pDiag ){
+   wxLogDebug( wxT("%s"), pDiag->pMessage );
+}
+void diagnostics_do_diag_mem( t_diag_struct * pDiag, long amount ){
+   wxLogDebug( wxT("%s %l"), pDiag->pMessage, amount );
+   pDiag->total += amount;
+   pDiag->most_recent = amount;
+   if( pDiag->countdown == (pDiag->initial_count -1 )){
+      pDiag->most = amount;
+      pDiag->least = amount;
+   }
+   else if( amount > pDiag->most ) 
+      pDiag->most = amount;
+   else if( amount < pDiag->least )
+      pDiag->least = amount;
+}
+
+void diagnostics_do_perfmon_start( t_diag_struct * pDiag, t_diag_struct ** pRememberMe ){
+   if( *pRememberMe == NULL ){
+      *pRememberMe = pDiag;
+      if( !bStopWatchStarted ){
+         bStopWatchStarted = true;
+         MasterWatch.Start();
+      }
+   }
+   pDiag->most_recent = MasterWatch.Time();
+}
+
+void diagnostics_do_perfmon_stop( const char * pMessage, t_diag_struct ** ppDiag ){
+   t_diag_struct * pDiag = *ppDiag;
+   *ppDiag = NULL;
+   long amount = MasterWatch.Time() - pDiag->most_recent;
+   pDiag->total += amount;
+   pDiag->most_recent = amount;
+   if( pDiag->countdown == (pDiag->initial_count -1 )){
+      pDiag->most = amount;
+      pDiag->least = amount;
+   }
+   else if( amount > pDiag->most ) 
+      pDiag->most = amount;
+   else if( amount < pDiag->least )
+      pDiag->least = amount;
+}
+
+
+void diag_sample_test(){
+   DIAG("Flip counter");// Flip counter will show in log ten times, then just count.
+}