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

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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.
+//
+///////////////////////////////////////////////////////////////////////////
+
+#include <PyImathUtil.h>
+#include <Iex.h>
+#include <boost/python.hpp>
+#include <pystate.h>
+
+namespace PyImath {
+
+PyAcquireLock::PyAcquireLock()
+{
+    _gstate = PyGILState_Ensure();
+}
+
+PyAcquireLock::~PyAcquireLock()
+{
+    PyGILState_Release(_gstate);
+}
+
+#ifdef PLATFORM_LINUX
+// On Windows, this extern is not needed and produces a symbol mismatch at link time.
+// We should verify that it's still needed on Linux for Python 2.6.
+extern "C" PyThreadState *_PyThreadState_Current;
+#endif
+
+static bool
+pyHaveLock()
+{
+    // This is very much dependent on the current Python
+    // implementation of this functionality.  If we switch versions of
+    // Python and the implementation changes, we'll have to change
+    // this code as well and introduce a #define for the Python
+    // version.
+    
+    if (!Py_IsInitialized())
+	throw IEX_NAMESPACE::LogicExc("PyReleaseLock called without the interpreter initialized");
+
+    PyThreadState *myThreadState = PyGILState_GetThisThreadState();
+
+    // If the interpreter is initialized the gil is held if the
+    // current thread's thread state is the current thread state
+    return myThreadState != 0 && myThreadState == _PyThreadState_Current;
+}
+
+PyReleaseLock::PyReleaseLock()
+{
+    // only call PyEval_SaveThread if we have the interpreter lock held,
+    // otherwise PyReleaseLock is a no-op.
+    if (pyHaveLock())
+        _save = PyEval_SaveThread();
+    else
+        _save = 0;
+}
+
+PyReleaseLock::~PyReleaseLock()
+{
+    if (_save != 0)
+        PyEval_RestoreThread(_save);
+}
+
+} // namespace PyImath