Run Crankshaft on a separate thread.

src/handles-inl.h

 // Copyright 2006-2008 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 15 matching lines @@
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 //
 
 #ifndef V8_HANDLES_INL_H_
 #define V8_HANDLES_INL_H_
 
 #include "api.h"
 #include "apiutils.h"
 #include "handles.h"
 #include "isolate.h"
+#include "v8threads.h"
 
 namespace v8 {
 namespace internal {
 
 inline Isolate* GetIsolateForHandle(Object* obj) {
   return Isolate::Current();
 }
 
 inline Isolate* GetIsolateForHandle(HeapObject* obj) {
   return obj->GetIsolate();
@@ skipping 16 matching lines @@
 template <typename T>
 inline T* Handle<T>::operator*() const {
   ASSERT(location_ != NULL);
   ASSERT(reinterpret_cast<Address>(*location_) != kHandleZapValue);
   return *BitCast<T**>(location_);
 }
 
 
 HandleScope::HandleScope() {
   Isolate* isolate = Isolate::Current();
+
+  if (FLAG_optimize_in_parallel &&
+      !isolate->thread_manager()->IsLockedByCurrentThread()) {
+    has_isolate_lock_ = true;
+    isolate->thread_manager()->Lock();
+  } else {
+    has_isolate_lock_ = false;
+  }
+
   v8::ImplementationUtilities::HandleScopeData* current =
       isolate->handle_scope_data();
   isolate_ = isolate;
   prev_next_ = current->next;
   prev_limit_ = current->limit;
   current->level++;
 }
 
 
 HandleScope::HandleScope(Isolate* isolate) {
   ASSERT(isolate == Isolate::Current());
   v8::ImplementationUtilities::HandleScopeData* current =
       isolate->handle_scope_data();
+
+  if (FLAG_optimize_in_parallel &&
+      !isolate->thread_manager()->IsLockedByCurrentThread()) {
+    has_isolate_lock_ = true;
+    isolate->thread_manager()->Lock();
+  } else {
+    has_isolate_lock_ = false;
+  }
+
   isolate_ = isolate;
   prev_next_ = current->next;
   prev_limit_ = current->limit;
   current->level++;
 }
 
 
 HandleScope::~HandleScope() {
   CloseScope();
+  if (has_isolate_lock_) {
+    isolate_->thread_manager()->Unlock();
+  }
 }
 
 void HandleScope::CloseScope() {
   ASSERT(isolate_ == Isolate::Current());
   v8::ImplementationUtilities::HandleScopeData* current =
       isolate_->handle_scope_data();
   current->next = prev_next_;
   current->level--;
   if (current->limit != prev_limit_) {
     current->limit = prev_limit_;
@@ skipping 64 matching lines @@
       Isolate::Current()->handle_scope_data();
   ASSERT_EQ(0, data->level);
   data->level = level_;
 }
 #endif
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_HANDLES_INL_H_