Per-isolate v8::Locker and v8::Unlocker

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 543 matching lines @@
   }
   i::List<JoinableThread*> threads(kNThreads);
   for (int i = 0; i < kNThreads; i++) {
     threads.Add(new LockUnlockLockThread(isolate, context));
   }
   StartJoinAndDeleteThreads(threads);
 }
 
 class LockUnlockLockDefaultIsolateThread : public JoinableThread {
  public:
-  LockUnlockLockDefaultIsolateThread(v8::Handle<v8::Context> context)
+  explicit LockUnlockLockDefaultIsolateThread(v8::Handle<v8::Context> context)
     : JoinableThread("LockUnlockLockDefaultIsolateThread"),
       context_(context) {
   }
 
   virtual void Run() {
     v8::Locker lock1;
     {
       v8::HandleScope handle_scope;
       v8::Context::Scope context_scope(context_);
       CalcFibAndCheck();
@@ skipping 21 matching lines @@
     v8::Locker locker_;
     v8::HandleScope handle_scope;
     context = v8::Context::New();
   }
   i::List<JoinableThread*> threads(kNThreads);
   for (int i = 0; i < kNThreads; i++) {
     threads.Add(new LockUnlockLockDefaultIsolateThread(context));
   }
   StartJoinAndDeleteThreads(threads);
 }