FXSpinLock.h

/********************************************************************************
*                                                                               *
*                           S p i n l o c k   C l a s s                         *
*                                                                               *
*********************************************************************************
* Copyright (C) 2004,2022 by Jeroen van der Zijp.   All Rights Reserved.        *
*********************************************************************************
* This library is free software; you can redistribute it and/or modify          *
* it under the terms of the GNU Lesser General Public License as published by   *
* the Free Software Foundation; either version 3 of the License, or             *
* (at your option) any later version.                                           *
*                                                                               *
* This library is distributed in the hope that it will be useful,               *
* but WITHOUT ANY WARRANTY; without even the implied warranty of                *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the                 *
* GNU Lesser General Public License for more details.                           *
*                                                                               *
* You should have received a copy of the GNU Lesser General Public License      *
* along with this program.  If not, see <http://www.gnu.org/licenses/>          *
********************************************************************************/
#ifndef FXSPINLOCK_H
#define FXSPINLOCK_H

namespace FX {


class FXAPI FXSpinLock {
private:
  volatile FXuval data[4];
private:
  FXSpinLock(const FXSpinLock&);
  FXSpinLock &operator=(const FXSpinLock&);
public:

  FXSpinLock();

  void lock();

  FXbool trylock();

  FXbool locked();

  void unlock();

  ~FXSpinLock();
  };


class FXAPI FXScopedSpinLock {
private:
  FXSpinLock& spn;
private:
  FXScopedSpinLock();
  FXScopedSpinLock(const FXScopedSpinLock&);
  FXScopedSpinLock& operator=(const FXScopedSpinLock&);
public:

  FXScopedSpinLock(FXSpinLock& s):spn(s){ lock(); }

  FXSpinLock& spinlock(){ return spn; }

  void lock(){ spn.lock(); }

  FXbool trylock(){ return spn.trylock(); }

  FXbool locked(){ return spn.locked(); }

  void unlock(){ spn.unlock(); }

  ~FXScopedSpinLock(){ unlock(); }
  };


class FXAPI FXReverseSpinLock {
private:
  FXSpinLock& spn;
private:
  FXReverseSpinLock();
  FXReverseSpinLock(const FXReverseSpinLock&);
  FXReverseSpinLock& operator=(const FXReverseSpinLock&);
public:

  FXReverseSpinLock(FXSpinLock& s):spn(s){ unlock(); }

  FXSpinLock& spinlock(){ return spn; }

  void lock(){ spn.lock(); }

  FXbool trylock(){ return spn.trylock(); }

  FXbool locked(){ return spn.locked(); }

  void unlock(){ spn.unlock(); }

  ~FXReverseSpinLock(){ lock(); }
  };

}

#endif