AppPkg/Applications/Python: Add Python 2.7.2 sources since the release of Python...

[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.2 / Lib / dummy_threading.py

diff --git a/AppPkg/Applications/Python/Python-2.7.2/Lib/dummy_threading.py b/AppPkg/Applications/Python/Python-2.7.2/Lib/dummy_threading.py
new file mode 100644 (file)
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+++ b/AppPkg/Applications/Python/Python-2.7.2/Lib/dummy_threading.py
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+"""Faux ``threading`` version using ``dummy_thread`` instead of ``thread``.\r
+\r
+The module ``_dummy_threading`` is added to ``sys.modules`` in order\r
+to not have ``threading`` considered imported.  Had ``threading`` been\r
+directly imported it would have made all subsequent imports succeed\r
+regardless of whether ``thread`` was available which is not desired.\r
+\r
+"""\r
+from sys import modules as sys_modules\r
+\r
+import dummy_thread\r
+\r
+# Declaring now so as to not have to nest ``try``s to get proper clean-up.\r
+holding_thread = False\r
+holding_threading = False\r
+holding__threading_local = False\r
+\r
+try:\r
+    # Could have checked if ``thread`` was not in sys.modules and gone\r
+    # a different route, but decided to mirror technique used with\r
+    # ``threading`` below.\r
+    if 'thread' in sys_modules:\r
+        held_thread = sys_modules['thread']\r
+        holding_thread = True\r
+    # Must have some module named ``thread`` that implements its API\r
+    # in order to initially import ``threading``.\r
+    sys_modules['thread'] = sys_modules['dummy_thread']\r
+\r
+    if 'threading' in sys_modules:\r
+        # If ``threading`` is already imported, might as well prevent\r
+        # trying to import it more than needed by saving it if it is\r
+        # already imported before deleting it.\r
+        held_threading = sys_modules['threading']\r
+        holding_threading = True\r
+        del sys_modules['threading']\r
+\r
+    if '_threading_local' in sys_modules:\r
+        # If ``_threading_local`` is already imported, might as well prevent\r
+        # trying to import it more than needed by saving it if it is\r
+        # already imported before deleting it.\r
+        held__threading_local = sys_modules['_threading_local']\r
+        holding__threading_local = True\r
+        del sys_modules['_threading_local']\r
+\r
+    import threading\r
+    # Need a copy of the code kept somewhere...\r
+    sys_modules['_dummy_threading'] = sys_modules['threading']\r
+    del sys_modules['threading']\r
+    sys_modules['_dummy__threading_local'] = sys_modules['_threading_local']\r
+    del sys_modules['_threading_local']\r
+    from _dummy_threading import *\r
+    from _dummy_threading import __all__\r
+\r
+finally:\r
+    # Put back ``threading`` if we overwrote earlier\r
+\r
+    if holding_threading:\r
+        sys_modules['threading'] = held_threading\r
+        del held_threading\r
+    del holding_threading\r
+\r
+    # Put back ``_threading_local`` if we overwrote earlier\r
+\r
+    if holding__threading_local:\r
+        sys_modules['_threading_local'] = held__threading_local\r
+        del held__threading_local\r
+    del holding__threading_local\r
+\r
+    # Put back ``thread`` if we overwrote, else del the entry we made\r
+    if holding_thread:\r
+        sys_modules['thread'] = held_thread\r
+        del held_thread\r
+    else:\r
+        del sys_modules['thread']\r
+    del holding_thread\r
+\r
+    del dummy_thread\r
+    del sys_modules\r