1 // SALOME SALOMEGUI : implementation of desktop and GUI kernel
3 // Copyright (C) 2003 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.
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.opencascade.org/SALOME/ or email : webmaster.salome@opencascade.org
24 // File : QAD_PyInterp.cxx
25 // Author : Nicolas REJNERI
29 #include "QAD_PyInterp.h"
30 #include "utilities.h"
36 static int MYDEBUG = 0;
38 static int MYDEBUG = 0;
43 * constructor : multi Python interpreter, one per SALOME study.
44 * calls initialize method defined in base class, which calls virtual methods
45 * initstate & initcontext redefined here.
47 QAD_PyInterp::QAD_PyInterp(): PyInterp_base()
51 QAD_PyInterp::~QAD_PyInterp()
57 * When SALOME uses multi Python interpreter feature,
58 * Every study has its own interpreter and thread state (_tstate = Py_NewInterpreter())
59 * This is fine because every study has its own modules (sys.modules) stdout and stderr
60 * BUT some Python modules must be imported only once. In multi interpreter context Python
61 * modules (*.py) are imported several times.
62 * The pyqt module must be imported only once because it registers classes in a C module.
63 * It's quite the same with omniorb modules (internals and generated with omniidl)
64 * This problem is handled with "shared modules" defined in salome_shared_modules.py
65 * These "shared modules" are imported only once and only copied in all the other interpreters
66 * BUT it's not the only problem. Every interpreter has its own __builtin__ module. That's fine
67 * but if we have copied some modules and imported others problems may arise with operations that
68 * are not allowed in restricted execution environment. So we must impose that all interpreters
69 * have identical __builtin__ module.
70 * That's all, for the moment ...
73 void QAD_PyInterp::initState()
75 _tstate = Py_NewInterpreter(); // create an interpreter and save current state
76 PySys_SetArgv(PyInterp_base::_argc,PyInterp_base::_argv); // initialize sys.argv
77 if(MYDEBUG) MESSAGE("QAD_PyInterp::initState - this = "<<this<<"; _tstate = "<<_tstate);
80 * If builtinmodule has been initialized all the sub interpreters
81 * will have the same __builtin__ module
84 PyObject *m = PyImport_GetModuleDict();
85 PyDict_SetItemString(m, "__builtin__", builtinmodule);
86 SCRUTE(builtinmodule->ob_refcnt); // builtinmodule reference counter
87 _tstate->interp->builtins = PyModule_GetDict(builtinmodule);
88 Py_INCREF(_tstate->interp->builtins);
93 void QAD_PyInterp::initContext()
95 PyObject *m = PyImport_AddModule("__main__"); // interpreter main module (module context)
97 if(MYDEBUG) MESSAGE("problem...");
102 _g = PyModule_GetDict(m); // get interpreter dictionnary context
103 if(MYDEBUG) MESSAGE("QAD_PyInterp::initContext - this = "<<this<<"; _g = "<<_g);
106 PyDict_SetItemString(_g, "__builtins__", builtinmodule); // assign singleton __builtin__ module
110 // Import special module to change the import mechanism
111 PyObjWrapper m1(PyImport_ImportModule("import_hook"));
113 MESSAGE("initContext: problem with import_hook import");
118 // Call init_shared_modules to initialize the shared import mechanism for modules
119 //that must not be imported twice
120 PyObjWrapper m2(PyObject_CallMethod(m1,"init_shared_modules","O",salome_shared_modules_module));
122 MESSAGE("initContext: problem with init_shared_modules call");