1 // Copyright (C) 2007-2016 CEA/DEN, EDF R&D, OPEN CASCADE
3 // Copyright (C) 2003-2007 OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
4 // CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
6 // This library is free software; you can redistribute it and/or
7 // modify it under the terms of the GNU Lesser General Public
8 // License as published by the Free Software Foundation; either
9 // version 2.1 of the License, or (at your option) any later version.
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 // Lesser General Public License for more details.
16 // You should have received a copy of the GNU Lesser General Public
17 // License along with this library; if not, write to the Free Software
18 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 // See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
22 // Author : Adrien BRUNETON
25 #ifndef PYINTERP_UTILS_H
26 #define PYINTERP_UTILS_H
35 * \class PyLockWrapper
36 * \brief Python GIL wrapper.
38 * Utility class wrapping the Python GIL acquisition. This makes use of the high level
39 * API (PyGILState_Ensure and PyGILState_Release), and is hence compatible with only
40 * one running Python interpreter (no call to Py_NewInterpreter()).
41 * When the class is instanciated the lock is acquired. It is released at destruction time.
42 * Copy construction (and hence assignation) is forbidden.
49 * \brief Constructor. Automatically acquires GIL.
53 _gil_state = PyGILState_Ensure();
54 // Save current thread state for later comparison
55 _state = PyGILState_GetThisThreadState();
59 * \brief Destructor. Automatically releases GIL.
63 PyThreadState* _currState = PyGILState_GetThisThreadState();
65 if (_currState != _state)
67 std::cout << "!!!!!!!!! PyLockWrapper inconsistency - now entering infinite loop for debugging\n";
71 PyGILState_Release(_gil_state);
75 PyGILState_STATE _gil_state;
76 PyThreadState* _state;
78 // "Rule of 3" - Forbid usage of copy operator and copy-constructor
79 PyLockWrapper(const PyLockWrapper & another);
80 const PyLockWrapper & operator=(const PyLockWrapper & another);
86 * \brief Utility class to properly handle the reference counting required on Python objects.
92 PyObjWrapper(PyObject* theObject) : myObject(theObject) {}
93 PyObjWrapper() : myObject(0) {}
94 virtual ~PyObjWrapper() { Py_XDECREF(myObject); }
96 operator PyObject*() { return myObject; }
97 PyObject* operator->() { return myObject; }
98 PyObject* get() { return myObject; }
99 bool operator!() { return !myObject; }
100 bool operator==(PyObject* theObject) { return myObject == theObject; }
101 PyObject** operator&() { return &myObject; }
102 PyObjWrapper& operator=(PyObjWrapper* theObjWrapper)
104 Py_XDECREF(myObject);
105 myObject = theObjWrapper->myObject;