Make fremontcut serial by default

lib/html/scripts/databasebuilder.py

 #!/usr/bin/python
 # Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 import copy
 import database
 import idlparser
 import logging
 import multiprocessing
@@ skipping 44 matching lines @@
     self.source = source
     self.source_attributes = source_attributes
     self.idl_syntax = idl_syntax
     self.idl_defines = idl_defines
     self.rename_operation_arguments_on_merge = \
         rename_operation_arguments_on_merge
     self.add_new_interfaces = add_new_interfaces
     self.obsolete_old_declarations = obsolete_old_declarations
 
 
-def _load_idl_file(file_name, import_options, result_queue):
+def _load_idl_file(file_name, import_options):
   """Loads an IDL file into memory"""
   idl_parser = idlparser.IDLParser(import_options.idl_syntax)
 
   try:
     f = open(file_name, 'r')
     content = f.read()
     f.close()
 
     idl_ast = idl_parser.parse(
       content,
       defines=import_options.idl_defines)
-    result = IDLFile(idl_ast, file_name)
+    return IDLFile(idl_ast, file_name)
+  except SyntaxError, e:
+    raise RuntimeError('Failed to load file %s: %s'
+                       % (file_name, e))
+ 
+def _load_idl_file_to_queue(file_name, import_options, result_queue):
+  """Loads an IDL file into a result_queue to process in the master thread"""
+  try:
+    result = _load_idl_file(file_name, import_options)
     result_queue.put(result, False)
     return 0
-  except SyntaxError, e:
-    result_queue.put(RuntimeError('Failed to load file %s: %s'
-                                  % (file_name, e)),
-                     False)
+  except RuntimeError, e:
+    result_queue.put(e, False)
     return 1
   except:
     result_queue.put('Unknown error loading %s' % file_name, False)
     return 1
 
 class DatabaseBuilder(object):
   def __init__(self, database):
     """DatabaseBuilder is used for importing and merging interfaces into
     the Database"""
     self._database = database
@@ skipping 324 matching lines @@
         else:
           raise Exception("Supplemental target '%s' not found", target)
 
     # Step 4: Resolve 'implements' statements
     for impl_stmt, import_options in self._impl_stmts:
       self._merge_impl_stmt(impl_stmt, import_options)
 
     self._impl_stmts = []
     self._imported_interfaces = []
 
-  def import_idl_files(self, file_paths, import_options):
-    # Parse the IDL files in parallel.
-    result_queue = multiprocessing.Queue(len(file_paths))
-    jobs = [ multiprocessing.Process(target=_load_idl_file,
-                                     args=(file_path, import_options,
-                                           result_queue))
-             for file_path in file_paths ]
-    try:
-      for job in jobs:
-        job.start()
-      for job in jobs:
-        # Timeout and throw after 5 sec.
-        result = result_queue.get(True, 5)
-        if isinstance(result, IDLFile):
-          self._process_idl_file(result, import_options)
-        else:
-          raise result
-    except:
-      # Clean up child processes on error.
-      for job in jobs:
-        job.terminate()
-      raise
+  def import_idl_files(self, file_paths, import_options, parallel):
+    if parallel:
+      # Parse the IDL files in parallel.
+      result_queue = multiprocessing.Queue(len(file_paths))
+      jobs = [ multiprocessing.Process(target=_load_idl_file_to_queue,
+                                       args=(file_path, import_options,
+                                             result_queue))
+               for file_path in file_paths ]
+      try:
+        for job in jobs:
+          job.start()
+        for job in jobs:
+          # Timeout and throw after 5 sec.
+          result = result_queue.get(True, 5)
+          if isinstance(result, IDLFile):
+            self._process_idl_file(result, import_options)
+          else:
+            raise result
+      except:
+        # Clean up child processes on error.
+        for job in jobs:
+          job.terminate()
+        raise
+    else:
+      # Parse the IDL files in serial.
+      for file_path in file_paths:
+        idl_file = _load_idl_file(file_path, import_options)
+        self._process_idl_file(idl_file, import_options)
 
   def _process_idl_file(self, idl_file,
                         import_options):
     self._strip_ext_attributes(idl_file)
     self._resolve_type_defs(idl_file)
     self._rename_types(idl_file, import_options)
 
     def enabled(idl_node):
       return self._is_node_enabled(idl_node, import_options.idl_defines)
 
@@ skipping 112 matching lines @@
       # TODO(antonm): Ideally we'd like to have pristine copy of WebKit IDLs and fetch
       # this information directly from it.  Unfortunately right now database is massaged
       # a lot so it's difficult to maintain necessary information on DOMWindow itself.
       interface = self._database.GetInterface(type)
       if 'V8EnabledPerContext' in attr.ext_attrs:
         interface.ext_attrs['synthesizedV8EnabledPerContext'] = \
             attr.ext_attrs['V8EnabledPerContext']
       if 'V8EnabledAtRuntime' in attr.ext_attrs:
         interface.ext_attrs['synthesizedV8EnabledAtRuntime'] = \
             attr.ext_attrs['V8EnabledAtRuntime'] or attr.id