167 lines
4.6 KiB
C++
167 lines
4.6 KiB
C++
///////////////////////////////////////////////////////////////////////////
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//
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// Copyright (c) 2001-2011, Industrial Light & Magic, a division of Lucas
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// Digital Ltd. LLC
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following disclaimer
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// in the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of Industrial Light & Magic nor the names of
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// its contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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//
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///////////////////////////////////////////////////////////////////////////
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#ifndef INCLUDED_PYIMATHUTIL_H
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#define INCLUDED_PYIMATHUTIL_H
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//----------------------------------------------------------------------------
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//
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// PyImath.h -- miscellaneous classes, functions
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// and macros that are useful for Python wrapping
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// of C++ objects.
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//
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//----------------------------------------------------------------------------
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#include <PyImathExport.h>
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#include <Python.h>
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namespace PyImath {
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/**
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* PyAcquireLock ensures that python is prepared for multi-threaded use and
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* ensures that this thread has the global lock.
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*
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* This object must be instantiated (and continue to be in scope) during all
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* threaded api calls. It assumes the python interpretter is instantiated and
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* multithreading is enabled.
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*
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* Note: this is not compatible with additional interpreters (calls to
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* Py_NewInterpreter());
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*/
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class PYIMATH_EXPORT PyAcquireLock
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{
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public:
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PyAcquireLock();
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~PyAcquireLock();
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private:
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PyGILState_STATE _gstate;
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};
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/**
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* This object causes the python global lock to be released for the duration
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* of it's existence.
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*
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* This object should be instantiated (and continue to be in scope) in thread-
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* safe c++ functions called from python. This call is designed to be
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* instantiated while an AcquireLock is in effect (nested).
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*
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*/
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class PYIMATH_EXPORT PyReleaseLock
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{
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public:
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PyReleaseLock();
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~PyReleaseLock();
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private:
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PyThreadState *_save;
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};
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/**
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* This object is safe object wrapper intended to use with boost python objects.
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*
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* This object correctly acquires the python lock for creation, copying and
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* desctruction of the given object.
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*
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*/
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template <class T>
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class PySafeObject
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{
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public:
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PySafeObject()
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: _object(0)
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{
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PyAcquireLock pylock;
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_object = new T();
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}
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PySafeObject(const T &value)
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: _object(0)
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{
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PyAcquireLock pylock;
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_object = new T(value);
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}
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~PySafeObject()
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{
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PyAcquireLock pylock;
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delete _object;
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_object = 0;
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}
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PySafeObject(const PySafeObject &other)
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: _object(0)
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{
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PyAcquireLock pylock;
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_object = new T(*other._object);
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}
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const PySafeObject &
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operator = (const PySafeObject &other)
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{
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if (&other == this) return *this;
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PyAcquireLock pylock;
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*_object = *other._object;
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return *this;
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}
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bool
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operator == (const PySafeObject &other) const
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{
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if (&other == this) return true;
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PyAcquireLock pylock;
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return *_object == *other._object;
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}
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bool
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operator != (const PySafeObject &other) const
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{
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if (&other == this) return false;
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PyAcquireLock pylock;
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return *_object != *other._object;
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}
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T & get() { return *_object; }
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const T & get() const { return *_object; }
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private:
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T *_object;
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};
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} // namespace PyImath
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#endif
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