Move python threading stuff to own file in bf_python_ext

This way blender player can easily use BPY_thread_save/restore.
Not so much important for master branch, but crucial to solve
linking issues in threaded depsgraph branch.

source/blender/python/generic/CMakeLists.txt

@@ -35,6 +35,7 @@ set(SRC
 	bgl.c
 	blf_py_api.c
 	bpy_internal_import.c
+	bpy_threads.c
 	idprop_py_api.c
 	py_capi_utils.c
 

source/blender/python/generic/bpy_threads.c

@@ -0,0 +1,67 @@
+/*
+ * ***** BEGIN GPL LICENSE BLOCK *****
+ *
+ * This program 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
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 this program; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * Contributor(s): None yet
+ *
+ * ***** END GPL LICENSE BLOCK *****
+ */
+
+/** \file blender/python/generic/bpy_threads.c
+ *  \ingroup pygen
+ *
+ * This file contains wrapper functions related to global interpreter lock.
+ * these functions are slightly different from the original Python API,
+ * don't throw SIGABRT even if the thread state is NULL. */
+
+/** \file blender/python/intern/bpy_interface.c
+ *  \ingroup pythonintern
+ *
+ * This file deals with embedding the python interpreter within blender,
+ * starting and stopping python and exposing blender/python modules so they can
+ * be accesses from scripts.
+ */
+
+/* grr, python redefines */
+#ifdef _POSIX_C_SOURCE
+#  undef _POSIX_C_SOURCE
+#endif
+
+#include <Python.h>
+
+#include "BLI_utildefines.h"
+#include "../BPY_extern.h"
+
+/* analogue of PyEval_SaveThread() */
+BPy_ThreadStatePtr BPY_thread_save(void)
+{
+	PyThreadState *tstate = PyThreadState_Swap(NULL);
+	/* note: tstate can be NULL when quitting Blender */
+
+	if (tstate && PyEval_ThreadsInitialized()) {
+		PyEval_ReleaseLock();
+	}
+
+	return (BPy_ThreadStatePtr)tstate;
+}
+
+/* analogue of PyEval_RestoreThread() */
+void BPY_thread_restore(BPy_ThreadStatePtr tstate)
+{
+	if (tstate) {
+		PyEval_RestoreThread((PyThreadState *)tstate);
+	}
+}

source/blender/python/intern/bpy_interface.c

@@ -408,31 +408,6 @@ void BPY_python_reset(bContext *C)
 	BPY_modules_load_user(C);
 }
 
-/* wrapper functions related to global interpreter lock. these functions
- * are slightly different from the original Python API, don't throw
- * SIGABRT even if the thread state is NULL. */
-
-/* analogue of PyEval_SaveThread() */
-BPy_ThreadStatePtr BPY_thread_save(void)
-{
-	PyThreadState *tstate = PyThreadState_Swap(NULL);
-	/* note: tstate can be NULL when quitting Blender */
-
-	if (tstate && PyEval_ThreadsInitialized()) {
-		PyEval_ReleaseLock();
-	}
-
-	return (BPy_ThreadStatePtr)tstate;
-}
-
-/* analogue of PyEval_RestoreThread() */
-void BPY_thread_restore(BPy_ThreadStatePtr tstate)
-{
-	if (tstate) {
-		PyEval_RestoreThread((PyThreadState *)tstate);
-	}
-}
-
 static void python_script_error_jump_text(struct Text *text)
 {
 	int lineno;