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cs440-acg/ext/openexr/PyIlmBase/PyImath/PyImathUtil.h

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