PythonQtThreadSupport.h

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#pragma once
/*
*
*  Copyright (C) 2018 MeVis Medical Solutions AG 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 2.1 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.
*
*  Further, this software is distributed without any warranty that it is
*  free of the rightful claim of any third person regarding infringement
*  or the like.  Any license provided herein, whether implied or
*  otherwise, applies only to this software file.  Patent licenses, if
*  any, provided herein do not apply to combinations of this program with
*  other software, or any other product whatsoever.
*
*  You should have received a copy of the GNU Lesser General Public
*  License along with this library; if not, write to the Free Software
*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*
*  Contact information: MeVis Medical Solutions AG, Universitaetsallee 29,
*  28359 Bremen, Germany or:
*
*  http://www.mevis.de
*
*/
 
//----------------------------------------------------------------------------------
//----------------------------------------------------------------------------------
 
#include <QtGlobal> //Q_DISABLE_COPY
#include "PythonQtPythonInclude.h"
#include "PythonQtSystem.h"
 
#define PYTHONQT_FULL_THREAD_SUPPORT
 
#ifdef PYTHONQT_FULL_THREAD_SUPPORT
  #define PYTHONQT_GIL_SUPPORT
  #define PYTHONQT_ALLOW_THREADS_SUPPORT
#endif
 
#ifdef PYTHONQT_GIL_SUPPORT
 
  #define PYTHONQT_GIL_SCOPE PythonQtGILScope internal_pythonqt_gilscope;

class PYTHONQT_EXPORT PythonQtGILScope
{
public:
  PythonQtGILScope();
 
  ~PythonQtGILScope();
 
  void release();

  static void setGILScopeEnabled(bool flag);
  static bool isGILScopeEnabled();
 
private:
  PyGILState_STATE _state;
  bool _ensured;
 
  static bool _enableGILScope;
};
 
#else
 
  #define PYTHONQT_GIL_SCOPE

class PythonQtGILScope
{
public:
  PythonQtGILScope() {}
  void release() {}
};
 
#endif
 
#ifdef PYTHONQT_ALLOW_THREADS_SUPPORT
 
  #define PYTHONQT_ALLOW_THREADS_SCOPE PythonQtThreadStateSaver internal_pythonqt_savethread;

class PythonQtThreadStateSaver
{
  Q_DISABLE_COPY(PythonQtThreadStateSaver)
public:
  PythonQtThreadStateSaver() { save(); }
 
  ~PythonQtThreadStateSaver() { restore(); }
 
  void save() { _state = PyEval_SaveThread(); }
 
  void restore()
  {
    if (_state) {
      PyEval_RestoreThread(_state);
      _state = nullptr;
    }
  }
 
private:
  PyThreadState* _state;
};
 
#else
 
  #define PYTHONQT_ALLOW_THREADS_SCOPE

class PythonQtThreadStateSaver
{
public:
  PythonQtThreadStateSaver() {};
  void save() {}
  void restore() {}
};
 
#endif