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
31 #include "QAD_PyInterp.h"
32 #include "utilities.h"
35 * constructor : multi Python interpreter, one per SALOME study.
36 * calls initialize method defined in base class, which calls virtual methods
37 * initstate & initcontext redefined here.
39 QAD_PyInterp::QAD_PyInterp(): PyInterp_base()
44 QAD_PyInterp::~QAD_PyInterp()
50 * When SALOME uses multi Python interpreter feature,
51 * Every study has its own interpreter and thread state (_tstate = Py_NewInterpreter())
52 * This is fine because every study has its own modules (sys.modules) stdout and stderr
53 * BUT some Python modules must be imported only once. In multi interpreter context Python
54 * modules (*.py) are imported several times.
55 * The pyqt module must be imported only once because it registers classes in a C module.
56 * It's quite the same with omniorb modules (internals and generated with omniidl)
57 * This problem is handled with "shared modules" defined in salome_shared_modules.py
58 * These "shared modules" are imported only once and only copied in all the other interpreters
59 * BUT it's not the only problem. Every interpreter has its own __builtin__ module. That's fine
60 * but if we have copied some modules and imported others problems may arise with operations that
61 * are not allowed in restricted execution environment. So we must impose that all interpreters
62 * have identical __builtin__ module.
63 * That's all, for the moment ...
66 void QAD_PyInterp::initState()
68 MESSAGE("QAD_PyInterp::initState");
69 salomeAcquireLock(); //acquire python global lock (one for all interpreters)
70 _tstate = Py_NewInterpreter(); //create an interpreter and save current state
72 SCRUTE(PyInterp_base::_argc);
73 SCRUTE(PyInterp_base::_argv[0]);
74 PySys_SetArgv(PyInterp_base::_argc,PyInterp_base::_argv); // initialize sys.argv
76 if(builtinmodule == NULL)return;
78 * If builtinmodule has been initialized all the sub interpreters
79 * will have the same __builtin__ module
81 PyObject *m=PyImport_GetModuleDict();
82 PyDict_SetItemString(m, "__builtin__", builtinmodule);
83 SCRUTE(builtinmodule->ob_refcnt); // builtinmodule reference counter
84 _tstate->interp->builtins = PyModule_GetDict(builtinmodule);
85 Py_INCREF(_tstate->interp->builtins);
88 void QAD_PyInterp::initContext()
90 MESSAGE("QAD_PyInterp::initContext");
92 m=PyImport_AddModule("__main__"); // interpreter main module (module context)
95 MESSAGE("problem...");
101 _g = PyModule_GetDict(m); // get interpreter dictionnary context
106 PyDict_SetItemString(_g, "__builtins__", builtinmodule); // assign singleton __builtin__ module
110 * Import special module to change the import mechanism
112 m =PyImport_ImportModule("import_hook");
114 MESSAGE("initContext: problem with import_hook import");
120 * Call init_shared_modules to initialize the shared import mechanism for modules
121 * that must not be imported twice
124 m= PyObject_CallMethod(m,
125 "init_shared_modules","O",salome_shared_modules_module);
127 MESSAGE("initContext: problem with init_shared_modules call");