Merge "Mark sphinx extensions thread safe"

openstackdocstheme/__init__.py

@@ -20,3 +20,7 @@ from .paths import *  # noqa
 def setup(app):
     ext.setup(app)
     page_context.setup(app)
+    return {
+        'parallel_read_safe': True,
+        'parallel_write_safe': True,
+    }

openstackdocstheme/ext.py

@@ -445,4 +445,5 @@ def setup(app):
 
     return {
         'parallel_read_safe': True,
+        'parallel_write_safe': True,
     }

openstackdocstheme/page_context.py

@@ -98,4 +98,5 @@ def setup(app):
     app.connect('html-page-context', html_page_context)
     return {
         'parallel_read_safe': True,
+        'parallel_write_safe': True,
     }