Fix ExtensionsRegistration cctest on ARM.

test/cctest/test-lockers.cc

 // Copyright 2007-2011 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 656 matching lines @@
     isolate->Dispose();
   }
  private:
   int count_;
   const char** extension_names_;
 };
 
 // Test installing extensions in separate isolates concurrently.
 // http://code.google.com/p/v8/issues/detail?id=1821
 TEST(ExtensionsRegistration) {
+#ifdef V8_TARGET_ARCH_ARM
+  const int kNThreads = 10;
+#else
   const int kNThreads = 40;
+#endif
   v8::RegisterExtension(new v8::Extension("test0",
                                           kSimpleExtensionSource));
   v8::RegisterExtension(new v8::Extension("test1",
                                           kSimpleExtensionSource));
   v8::RegisterExtension(new v8::Extension("test2",
                                           kSimpleExtensionSource));
   v8::RegisterExtension(new v8::Extension("test3",
                                           kSimpleExtensionSource));
   v8::RegisterExtension(new v8::Extension("test4",
                                           kSimpleExtensionSource));
   v8::RegisterExtension(new v8::Extension("test5",
                                           kSimpleExtensionSource));
   v8::RegisterExtension(new v8::Extension("test6",
                                           kSimpleExtensionSource));
   v8::RegisterExtension(new v8::Extension("test7",
                                           kSimpleExtensionSource));
   const char* extension_names[] = { "test0", "test1",
                                     "test2", "test3", "test4",
                                     "test5", "test6", "test7" };
   i::List<JoinableThread*> threads(kNThreads);
   for (int i = 0; i < kNThreads; i++) {
     threads.Add(new IsolateGenesisThread(8, extension_names));
   }
   StartJoinAndDeleteThreads(threads);
 }