oct-mutex.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2008-2023 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave 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 General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
 
#if ! defined (octave_oct_mutex_h)
#define octave_oct_mutex_h 1
 
#include "octave-config.h"
 
#include <memory>
 
OCTAVE_BEGIN_NAMESPACE(octave)
 
class mutex;
 
class
OCTAVE_API
base_mutex
{
public:
  friend class mutex;
 
  base_mutex (void) = default;
 
  virtual ~base_mutex (void) = default;
 
  virtual void lock (void);
 
  virtual void unlock (void);
 
  virtual bool try_lock (void);
};
 
class
OCTAVE_API
mutex
{
public:
  mutex (void);
 
  mutex (const mutex& m) = default;
 
  ~mutex (void) = default;
 
  mutex& operator = (const mutex& m) = default;
 
  void lock (void)
  {
    m_rep->lock ();
  }
 
  void unlock (void)
  {
    m_rep->unlock ();
  }
 
  bool try_lock (void)
  {
    return m_rep->try_lock ();
  }
 
protected:
  std::shared_ptr<base_mutex> m_rep;
};
 
class
OCTAVE_API
autolock
{
public:
  autolock (const mutex& m, bool block = true)
    : m_mutex (m), m_lock_result (false)
  {
    if (block)
      {
        m_mutex.lock ();
        m_lock_result = true;
      }
    else
      m_lock_result = m_mutex.try_lock ();
  }
 
  // No copying.
 
  autolock (const autolock&) = delete;
 
  autolock& operator = (const autolock&) = delete;
 
  ~autolock (void)
  {
    if (m_lock_result)
      m_mutex.unlock ();
  }
 
  bool ok (void) const { return m_lock_result; }
 
  operator bool (void) const { return ok (); }
 
private:
 
  mutex m_mutex;
 
  bool m_lock_result;
};
 
 
class
OCTAVE_API
thread
{
public:
 
  static void init (void);
 
  static bool is_thread (void);
};
 
OCTAVE_END_NAMESPACE(octave)
 
#endif