Thread.h

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//     ____   ______ __
//    / __ \ / ____// /
//   / /_/ // /    / /
//  / ____// /___ / /___   PixInsight Class Library
// /_/     \____//_____/   PCL 2.9.3
// ----------------------------------------------------------------------------
// pcl/Thread.h - Released 2025-02-21T12:13:32Z
// ----------------------------------------------------------------------------
// This file is part of the PixInsight Class Library (PCL).
// PCL is a multiplatform C++ framework for development of PixInsight modules.
//
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// ----------------------------------------------------------------------------
 
#ifndef __PCL_Thread_h
#define __PCL_Thread_h
 
 
#include <pcl/Defs.h>
 
#include <pcl/String.h>
#include <pcl/UIObject.h>
 
namespace pcl
{
 
// ----------------------------------------------------------------------------
 
// ----------------------------------------------------------------------------
 
namespace ThreadPriority
{
   enum value_type
   {
      Inherit,       // Inherit caller's thread priority.
      Idle,          // Schedule when no other threads are busy.
      Lowest,
      Low,
      Normal,        // Standard thread priority.
      High,
      Highest,       // Schedule as often as possible.
      TimeCritical,  // Schedule as often as possible, taking precedence over any other threads.
      DefaultMax = Highest
   };
}
 
// ----------------------------------------------------------------------------
 
namespace PerformanceAnalysisAlgorithm
{
   enum value_type
   {
      Unknown                   = 0,
 
      /*
       * Statistical estimators / fundamental math algorithms
       */
      FastMedian                = 1001,
      FastMAD                   = 1002,
      NoiseMRS                  = 1003,
 
      /*
       * Image performance-critical routines
       */
      Sampling                  = 2001,
      MinMax                    = 2002,
      Sum                       = 2003,
      BiweightMidvariance       = 2004,
      ColorSpaceConversion      = 2005,
      GetLightness              = 2006,
      GetIntensity              = 2007,
      HistogramGeneration       = 2008,
      HistogramTransformation   = 2009,
      PSFFit                    = 2010,
 
      /*
       * Kernel-based transformations
       */
      Convolution               = 3001,
      MorphologicalMedian       = 3002,
 
      /*
       * Separable transformations
       */
      SeparableConvolution_Rows = 4001,
      SeparableConvolution_Cols = 4002,
      FFT2D                     = 4003,
      FFT2D_Real                = 4004,
 
      /*
       * Geometric transformations
       */
      Resample                  = 5001,
      Rotation                  = 5002,
      AstrometricReprojection   = 5003,
 
      /*
       * Bitmap rendering algorithms
       */
      Render                    = 6001,
      FastRender                = 6002,
 
      /*
       * Algorithm selection (optimized convolutions, by kernel size)
       */
      SeparableConvolutionFasterThanNonseparable = 10001,
      FFTConvolutionFasterThanNonseparable       = 10002
   };
}
 
// ----------------------------------------------------------------------------
 
class PCL_CLASS Thread : public UIObject
{
public:
 
   using priority = ThreadPriority::value_type;
 
   using performance_analysis_algorithm = PerformanceAnalysisAlgorithm::value_type;
 
   struct PerformanceAnalysisData
   {
      performance_analysis_algorithm
                algorithm     = PerformanceAnalysisAlgorithm::Unknown; 
      size_type length        = 0;    
      size_type minimumLength = 1;    
      size_type overheadLimit = 1;    
      int       itemSize      = 4;    
      bool      floatingPoint = true; 
      int       kernelSize    = 0;    
      int       width         = 0;    
      int       height        = 0;    
   };
 
   Thread();
 
   ~Thread() override
   {
   }
 
   void EnsureUnique() override
   {
      // Threads are unique objects by definition.
   }
 
   static Thread& Null();
 
   void Start( priority = ThreadPriority::Inherit, int processor = -1 );
 
   Array<int> Affinity() const;
 
   bool SetAffinity( const Array<int>& processors );
 
   bool SetAffinity( int processor );
 
   void Kill(); // ### Dangerous - Use at your own risk! ###
 
   bool IsActive() const;
 
   priority Priority() const;
 
   void SetPriority( priority );
 
   void ResetPriority()
   {
      SetPriority( ThreadPriority::Inherit );
   }
 
   void Wait();
 
   bool Wait( unsigned ms );
 
   void Sleep( unsigned ms );
 
   /*
    * Returns a reference to the current thread (the thread from which this
    * member function is invoked), or Thread::Null() if the current thread is
    * either (a) a thread not being controlled by the PixInsight API, or (b) a
    * thread that has been created by another module.
   static Thread& CurrentThread();
    */
 
   static bool IsRootThread();
 
   static int NumberOfRunningThreads();
 
   virtual void Run()
   {
      // Reimplement this function to provide your thread's functionality.
   }
 
   uint32 Status() const;
 
   bool TryGetStatus( uint32& status ) const;
 
   void SetStatus( uint32 status );
 
   void Abort()
   {
      SetStatus( 0x80000000 );
   }
 
   bool IsAborted() const
   {
      return (Status() & 0x80000000) != 0;
   }
 
   bool TryIsAborted() const
   {
      uint32 status;
      return TryGetStatus( status ) && (status & 0x80000000) != 0;
   }
 
   String ConsoleOutputText() const;
 
   bool HasConsoleOutputText() const
   {
      return !ConsoleOutputText().IsEmpty();
   }
 
   void ClearConsoleOutputText();
 
   void FlushConsoleOutputText();
 
   static int NumberOfThreads( size_type count, size_type overheadLimit = 1u );
 
   static Array<size_type> OptimalThreadLoads( size_type count,
                                               size_type overheadLimit = 1u,
                                               int maxThreads = PCL_MAX_PROCESSORS );
 
   static int OptimalNumberOfThreads( const Thread::PerformanceAnalysisData& data );
 
   static Array<size_type> OptimalThreadLoads( const PerformanceAnalysisData& data,
                                               int maxThreads = PCL_MAX_PROCESSORS );
 
   static Array<size_type> OptimalThreadLoadsAligned( size_type count,
                                                      int align = 16,
                                                      size_type overheadLimit = 1u,
                                                      int maxThreads = PCL_MAX_PROCESSORS );
private:
 
   int m_processorIndex = -1;
 
   Thread( void* h ) : UIObject( h )
   {
   }
 
   void* CloneHandle() const override;
 
protected:
 
   virtual bool IsStealth() const
   {
      return false;
   }
 
   friend class ThreadDispatcher;
};
 
// ----------------------------------------------------------------------------
 
void PCL_FUNC Sleep( unsigned ms );
 
// ----------------------------------------------------------------------------
 
} // pcl
 
#endif   // __PCL_Thread_h
 
// ----------------------------------------------------------------------------
// EOF pcl/Thread.h - Released 2025-02-21T12:13:32Z