TStaticSync.h

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#pragma once
 
#include <misc/gen/Exception.h>
#include <misc/gen/Sync.h>
#include <misc/global.h>
 
namespace sf
{
 
template<typename T>
class TStaticSync
{
  public:
    TStaticSync<T>& operator=(const TStaticSync<T>&) = delete;
 
  protected:
    TStaticSync();
 
    TStaticSync(const TStaticSync<T>&);
 
    ~TStaticSync();
 
    class Lock : public Mutex::Lock
    {
      public:
        Lock()
          : Mutex::Lock(*TStaticSync<T>::_mutex, false)
        {}
 
        explicit Lock(bool try_lock)
          : Mutex::Lock(*TStaticSync<T>::_mutex, try_lock)
        {}
    };
 
  private:
    static Mutex* _mutex;
    static unsigned _count;
};
 
template<typename T>
inline TStaticSync<T>::TStaticSync()
{
  if (_count++ == 0)
  {
    _mutex = new Mutex;
  }
}
 
template<typename T>
inline TStaticSync<T>::TStaticSync(const TStaticSync<T>&)
{
  _count++;
}
 
template<typename T>
inline TStaticSync<T>::~TStaticSync()
{
  // If this is the only remaining TStaticSync<T> object, destroy the semaphore.
  if (--_count == 0)
  {
    delete _mutex;
  }
}
 
}// namespace sf