#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
*
*/
//----------------------------------------------------------------------------------
/*!
// \file PythonQtThreadSupport.h
// \author Florian Link
// \date 2018-08
*/
//----------------------------------------------------------------------------------
#include <PythonQtPythonInclude.h>
#include <PythonQtSystem.h>
#ifdef PYTHONQT_FULL_THREAD_SUPPORT
#define PYTHONQT_GIL_SUPPORT
#define PYTHONQT_ALLOW_THREADS_SUPPORT
#endif
#ifdef PYTHONQT_GIL_SUPPORT
//! Ensures/releases the Python GIL
//! An instance of this class can be used to
//! allow access to the Python API from C++ code.
class PythonQtGILScope
{
public:
PythonQtGILScope() : _ensured(false) {
if (Py_IsInitialized()) {
_state = PyGILState_Ensure();
_ensured = true;
}
};
~PythonQtGILScope() {
release();
};
void release() {
if (_ensured) {
PyGILState_Release(_state);
_ensured = false;
}
}
private:
PyGILState_STATE _state;
bool _ensured;
};
#else
//! Empty dummy implementation.
class PythonQtGILScope
{
public:
PythonQtGILScope() {}
void release() {}
};
#endif
#ifdef PYTHONQT_ALLOW_THREADS_SUPPORT
//! This class wraps the Python save/restore thread state API.
//! It can be used to allow other Python threads to run when entering C++ code
//! from Python code.
class PythonQtThreadStateSaver
{
public:
PythonQtThreadStateSaver() {
save();
}
~PythonQtThreadStateSaver() {
restore();
}
void save() {
_state = PyEval_SaveThread();
}
void restore() {
if (_state) {
PyEval_RestoreThread(_state);
_state = NULL;
}
}
private:
PyThreadState* _state;
};
#else
//! Empty dummy implementation.
class PythonQtThreadStateSaver
{
public:
PythonQtThreadStateSaver() {};
void save() {}
void restore() {}
};
#endif