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/* -*- c++ -*- */
/*
* Copyright 2006 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2, or (at your option)
* any later version.
*
* GNU Radio 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with GNU Radio; see the file COPYING. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street,
* Boston, MA 02110-1301, USA.
*/
/*
* N.B., this is a _very_ non-standard SWIG .i file
*
* It contains a bunch of magic that is required to ensure that when
* these classes are used as base classes for python code,
* everything works when calling back from C++ into Python.
*
* The gist of the problem is that our C++ code is usually not holding
* the Python Global Interpreter Lock (GIL). Thus if we invoke a
* "director" method from C++, we'll end up in Python not holding the
* GIL. Disaster (SIGSEGV) will result. To avoid this we insert a
* "shim" that grabs and releases the GIL.
*
* If you don't understand SWIG "directors" or the Python GIL,
* don't bother trying to understand what's going on in here.
*
* [We could eliminate a bunch of this hair by requiring SWIG 1.3.29
* or later and some additional magic declarations, but many systems
* aren't shipping that version yet. Thus we kludge...]
*/
// Enable SWIG directors for these classes
%feature("director") gr_py_feval_dd;
%feature("director") gr_py_feval_cc;
%feature("director") gr_py_feval_ll;
%feature("director") gr_py_feval;
%feature("nodirector") gr_py_feval_dd::calleval;
%feature("nodirector") gr_py_feval_cc::calleval;
%feature("nodirector") gr_py_feval_ll::calleval;
%feature("nodirector") gr_py_feval::calleval;
%rename(feval_dd) gr_py_feval_dd;
%rename(feval_cc) gr_py_feval_cc;
%rename(feval_ll) gr_py_feval_ll;
%rename(feval) gr_py_feval;
//%exception {
// try { $action }
// catch (Swig::DirectorException &e) { std::cerr << e.getMessage(); SWIG_fail; }
//}
%{
// class that ensures we acquire and release the Python GIL
class ensure_py_gil_state {
PyGILState_STATE d_gstate;
public:
ensure_py_gil_state() { d_gstate = PyGILState_Ensure(); }
~ensure_py_gil_state() { PyGILState_Release(d_gstate); }
};
%}
/*
* These are the real C++ base classes, however we don't want these exposed.
*/
%ignore gr_feval_dd;
class gr_feval_dd
{
protected:
virtual double eval(double x);
public:
gr_feval_dd() {}
virtual ~gr_feval_dd();
virtual double calleval(double x);
};
%ignore gr_feval_cc;
class gr_feval_cc
{
protected:
virtual gr_complex eval(gr_complex x);
public:
gr_feval_cc() {}
virtual ~gr_feval_cc();
virtual gr_complex calleval(gr_complex x);
};
%ignore gr_feval_ll;
class gr_feval_ll
{
protected:
virtual long eval(long x);
public:
gr_feval_ll() {}
virtual ~gr_feval_ll();
virtual long calleval(long x);
};
%ignore gr_feval;
class gr_feval
{
protected:
virtual void eval();
public:
gr_feval() {}
virtual ~gr_feval();
virtual void calleval();
};
/*
* These are the ones to derive from in Python. They have the magic shim
* that ensures that we're holding the Python GIL when we enter Python land...
*/
%inline %{
class gr_py_feval_dd : public gr_feval_dd
{
public:
double calleval(double x)
{
ensure_py_gil_state _lock;
return eval(x);
}
};
class gr_py_feval_cc : public gr_feval_cc
{
public:
gr_complex calleval(gr_complex x)
{
ensure_py_gil_state _lock;
return eval(x);
}
};
class gr_py_feval_ll : public gr_feval_ll
{
public:
long calleval(long x)
{
ensure_py_gil_state _lock;
return eval(x);
}
};
class gr_py_feval : public gr_feval
{
public:
void calleval()
{
ensure_py_gil_state _lock;
eval();
}
};
%}
// examples / test cases
%rename(feval_dd_example) gr_feval_dd_example;
double gr_feval_dd_example(gr_feval_dd *f, double x);
%rename(feval_cc_example) gr_feval_cc_example;
gr_complex gr_feval_cc_example(gr_feval_cc *f, gr_complex x);
%rename(feval_ll_example) gr_feval_ll_example;
long gr_feval_ll_example(gr_feval_ll *f, long x);
%rename(feval_example) gr_feval_example;
void gr_feval_example(gr_feval *f);
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