Thread-safe JS execution

src/JsEngine.cpp

 #include <AdblockPlus.h>
 #include <sstream>
 
 #include "GlobalJsObject.h"
 
 namespace
 {
   v8::Handle<v8::Context> CreateContext(
     AdblockPlus::ErrorCallback& errorCallback)
   {
+    const v8::Locker locker(v8::Isolate::GetCurrent());
     const v8::HandleScope handleScope;
     const v8::Handle<v8::ObjectTemplate> global =
       AdblockPlus::GlobalJsObject::Create(errorCallback);
     return v8::Context::New(0, global);
   }
 
   v8::Handle<v8::Script> CompileScript(const char* source, const char* filename)
   {
     const v8::Handle<v8::String> v8Source = v8::String::New(source);
     if (filename && filename[0])
@@ skipping 41 matching lines @@
 }
 
 AdblockPlus::JsEngine::JsEngine(const FileReader* const fileReader,
                                 ErrorCallback* const errorCallback)
   : fileReader(fileReader), context(CreateContext(*errorCallback))
 {
 }
 
 void AdblockPlus::JsEngine::Evaluate(const char* source, const char* filename)
 {
+  const v8::Locker locker(v8::Isolate::GetCurrent());
   const v8::HandleScope handleScope;
   const v8::Context::Scope contextScope(context);
   const v8::TryCatch tryCatch;
   const v8::Handle<v8::Script> script = CompileScript(source, filename);
   CheckTryCatch(tryCatch);
   script->Run();
   CheckTryCatch(tryCatch);
 }
 
 void AdblockPlus::JsEngine::Evaluate(const std::string& source,
     const std::string& filename)
 {
   Evaluate(source.c_str(), filename.c_str());
 }
 
 void AdblockPlus::JsEngine::Load(const std::string& scriptPath)
 {
   const std::auto_ptr<std::istream> file = fileReader->Read(scriptPath);
   if (!*file)
     throw std::runtime_error("Unable to load script " + scriptPath);
   Evaluate(Slurp(*file));
 }
 
 std::string AdblockPlus::JsEngine::Call(const std::string& functionName)
 {
+  const v8::Locker locker(v8::Isolate::GetCurrent());
   const v8::HandleScope handleScope;
   const v8::Context::Scope contextScope(context);
   const v8::Local<v8::Object> global = context->Global();
   const v8::Local<v8::Function> function = v8::Local<v8::Function>::Cast(
     global->Get(v8::String::New(functionName.c_str())));
   const v8::TryCatch tryCatch;
   const v8::Local<v8::Value> result = function->Call(function, 0, 0);
   CheckTryCatch(tryCatch);
   const v8::String::AsciiValue ascii(result);
   return *ascii;
 }
 
 void AdblockPlus::JsEngine::Gc()
 {
   while (!v8::V8::IdleNotification());
 }