quick addition of cosmo pthreads to python.com

- enable WITH_THREAD and _POSIX_THREADS
- add headers everywhere
- breaks only two tests (faulthandler and signal)
- disabled terminal completion because it causes segfaults for some
  reason (probably could not get the current thread)

third_party/python/Lib/importlib/_bootstrap.py

@@ -520,31 +520,29 @@ def _module_repr_from_spec(spec):
         else:
             return '<module {!r} ({})>'.format(spec.name, spec.origin)
 
-
-# Used by importlib.reload() and _load_module_shim().
 def _exec(spec, module):
     """Execute the spec's specified module in an existing module's namespace."""
     name = spec.name
-    if sys.modules.get(name) is not module:
-        msg = 'module {!r} not in sys.modules'.format(name)
-        raise ImportError(msg, name=name)
-    if spec.loader is None:
-        if spec.submodule_search_locations is None:
-            raise ImportError('missing loader', name=spec.name)
-        # namespace package
+    with _ModuleLockManager(name):
+        if sys.modules.get(name) is not module:
+            msg = 'module {!r} not in sys.modules'.format(name)
+            raise ImportError(msg, name=name)
+        if spec.loader is None:
+            if spec.submodule_search_locations is None:
+                raise ImportError('missing loader', name=spec.name)
+            # namespace package
+            _init_module_attrs(spec, module, override=True)
+            return module
         _init_module_attrs(spec, module, override=True)
-        return module
-    _init_module_attrs(spec, module, override=True)
-    if not hasattr(spec.loader, 'exec_module'):
-        # (issue19713) Once BuiltinImporter and ExtensionFileLoader
-        # have exec_module() implemented, we can add a deprecation
-        # warning here.
-        spec.loader.load_module(name)
-    else:
-        spec.loader.exec_module(module)
+        if not hasattr(spec.loader, 'exec_module'):
+            # (issue19713) Once BuiltinImporter and ExtensionFileLoader
+            # have exec_module() implemented, we can add a deprecation
+            # warning here.
+            spec.loader.load_module(name)
+        else:
+            spec.loader.exec_module(module)
     return sys.modules[name]
 
-
 def _load_backward_compatible(spec):
     # (issue19713) Once BuiltinImporter and ExtensionFileLoader
     # have exec_module() implemented, we can add a deprecation
@@ -606,8 +604,8 @@ def _load(spec):
     clobbered.
 
     """
-    return _load_unlocked(spec)
-
+    with _ModuleLockManager(spec.name):
+        return _load_unlocked(spec)
 
 # Loaders #####################################################################
 

third_party/python/Lib/importlib/_bootstrap_external.py

@@ -1388,6 +1388,7 @@ def _setup(_bootstrap_module):
         "builtins",
         "marshal",
         "posix",
+        "_thread",
         "_weakref",
     ):
         self_mod_dict[name] = sys.modules.get(
@@ -1400,7 +1401,6 @@ def _setup(_bootstrap_module):
     self_mod_dict["_os"] = sys.modules.get(builtin_os, builtin_from_name(builtin_os))
     self_mod_dict["path_sep"] =  path_separators[0]
     self_mod_dict["path_separators"] = "".join(path_separators)
-    self_mod_dict["_thread"] = None
     # Constants
     EXTENSION_SUFFIXES.extend(_imp.extension_suffixes())