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145 lines
3.6 KiB
C++
145 lines
3.6 KiB
C++
#pragma once
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/*
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*
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* Copyright (C) 2018 MeVis Medical Solutions AG All Rights Reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* Further, this software is distributed without any warranty that it is
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* free of the rightful claim of any third person regarding infringement
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* or the like. Any license provided herein, whether implied or
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* otherwise, applies only to this software file. Patent licenses, if
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* any, provided herein do not apply to combinations of this program with
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* other software, or any other product whatsoever.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* Contact information: MeVis Medical Solutions AG, Universitaetsallee 29,
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* 28359 Bremen, Germany or:
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*
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* http://www.mevis.de
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*
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*/
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//----------------------------------------------------------------------------------
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/*!
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// \file PythonQtThreadSupport.h
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// \author Florian Link
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// \date 2018-08
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*/
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//----------------------------------------------------------------------------------
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#include <QtGlobal> //Q_DISABLE_COPY
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#include "PythonQtPythonInclude.h"
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#include "PythonQtSystem.h"
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#define PYTHONQT_FULL_THREAD_SUPPORT
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#ifdef PYTHONQT_FULL_THREAD_SUPPORT
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#define PYTHONQT_GIL_SUPPORT
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#define PYTHONQT_ALLOW_THREADS_SUPPORT
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#endif
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#ifdef PYTHONQT_GIL_SUPPORT
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#define PYTHONQT_GIL_SCOPE PythonQtGILScope internal_pythonqt_gilscope;
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//! Ensures/releases the Python GIL
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//! An instance of this class can be used to
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//! allow access to the Python API from C++ code.
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class PYTHONQT_EXPORT PythonQtGILScope
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{
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public:
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PythonQtGILScope();
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~PythonQtGILScope();
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void release();
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//! This allows to globally enable/disable the GIL scopes.
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//! Make sure to only call this early in the PythonQt setup, or
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//! when you are holding the GIL.
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static void setGILScopeEnabled(bool flag);
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//! Check if GIL scopes are enabled.
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static bool isGILScopeEnabled();
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private:
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PyGILState_STATE _state;
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bool _ensured;
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static bool _enableGILScope;
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};
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#else
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#define PYTHONQT_GIL_SCOPE
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//! Empty dummy implementation.
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class PythonQtGILScope
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{
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public:
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PythonQtGILScope() {}
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void release() {}
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};
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#endif
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#ifdef PYTHONQT_ALLOW_THREADS_SUPPORT
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#define PYTHONQT_ALLOW_THREADS_SCOPE PythonQtThreadStateSaver internal_pythonqt_savethread;
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//! This class wraps the Python save/restore thread state API.
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//! It can be used to allow other Python threads to run when entering C++ code
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//! from Python code.
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class PythonQtThreadStateSaver
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{
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Q_DISABLE_COPY(PythonQtThreadStateSaver)
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public:
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PythonQtThreadStateSaver() {
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save();
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}
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~PythonQtThreadStateSaver() {
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restore();
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}
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void save() {
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_state = PyEval_SaveThread();
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}
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void restore() {
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if (_state) {
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PyEval_RestoreThread(_state);
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_state = nullptr;
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}
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}
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private:
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PyThreadState* _state;
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};
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#else
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#define PYTHONQT_ALLOW_THREADS_SCOPE
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//! Empty dummy implementation.
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class PythonQtThreadStateSaver
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{
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public:
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PythonQtThreadStateSaver() {};
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void save() {}
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void restore() {}
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};
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#endif
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