From ccde3a583b74bca8f8a5b5c67e9ee8c7232990da Mon Sep 17 00:00:00 2001
From: Matthew Andrew <matthew.andrew@stfc.ac.uk>
Date: Wed, 15 Aug 2018 10:33:51 +0100
Subject: [PATCH] Commited new class Re #23266
---
.../ReleaseGlobalInterpreterLock.h | 52 +++++++++++++++++++
1 file changed, 52 insertions(+)
create mode 100644 Framework/PythonInterface/inc/MantidPythonInterface/kernel/Environment/ReleaseGlobalInterpreterLock.h
diff --git a/Framework/PythonInterface/inc/MantidPythonInterface/kernel/Environment/ReleaseGlobalInterpreterLock.h b/Framework/PythonInterface/inc/MantidPythonInterface/kernel/Environment/ReleaseGlobalInterpreterLock.h
new file mode 100644
index 00000000000..8003167db39
--- /dev/null
+++ b/Framework/PythonInterface/inc/MantidPythonInterface/kernel/Environment/ReleaseGlobalInterpreterLock.h
@@ -0,0 +1,52 @@
+#ifndef MANTID_PYTHONINTERFACE_RELEASEGLOBALINTERPRETERLOCK_H_
+#define MANTID_PYTHONINTERFACE_RELEASEGLOBALINTERPRETERLOCK_H_
+
+#include "MantidPythonInterface/kernel/DllConfig.h"
+#include <boost/python/detail/wrap_python.hpp>
+
+namespace Mantid {
+namespace PythonInterface {
+namespace Environment {
+
+/**
+ * Defines a structure for releaseing the Python GIL
+ * using the RAII pattern. This releases the Python GIL
+ * for the duration of the current scope.
+ */
+class PYTHON_KERNEL_DLL ReleaseGlobalInterpreterLock {
+public:
+ /// Default constructor
+ ReleaseGlobalInterpreterLock();
+ /// Destructor
+ ~ReleaseGlobalInterpreterLock();
+
+private:
+ // Stores the current python trace used to track where in
+ // a python script you are.
+ Py_tracefunc m_tracefunc;
+ PyObject *m_tracearg;
+ /// Saved thread state
+ PyThreadState *m_saved;
+};
+
+ReleaseGlobalInterpreterLock::ReleaseGlobalInterpreterLock()
+ : m_tracefunc(nullptr), m_tracearg(nullptr), m_saved(nullptr) {
+ PyThreadState *curThreadState = PyThreadState_GET();
+ m_tracefunc = curThreadState->c_tracefunc;
+ m_tracearg = curThreadState->c_traceobj;
+ Py_XINCREF(m_tracearg);
+ PyEval_SetTrace(nullptr, nullptr);
+ m_saved = PyEval_SaveThread();
+}
+
+ReleaseGlobalInterpreterLock::~ReleaseGlobalInterpreterLock() {
+ PyEval_RestoreThread(m_saved);
+ PyEval_SetTrace(m_tracefunc, m_tracearg);
+ Py_XDECREF(m_tracearg);
+}
+
+} // namespace Environment
+} // namespace PythonInterface
+} // namespace Mantid
+
+#endif /* MANTID_PYTHONINTERFACE_RELEASEGLOBALINTERPRETERLock_H_ */
--
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