Ensure that the worker pool is running if we intend to use it

src/v8.cc

 // Copyright 2012 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 64 matching lines @@
   ASSERT(i::Isolate::CurrentPerIsolateThreadData()->isolate() ==
          i::Isolate::Current());
 
   Isolate* isolate = Isolate::Current();
   if (isolate->IsDead()) return false;
   if (isolate->IsInitialized()) return true;
 
 #ifdef V8_USE_DEFAULT_PLATFORM
   DefaultPlatform* platform = static_cast<DefaultPlatform*>(platform_);
   platform->SetThreadPoolSize(isolate->max_available_threads());
+  // We currently only start the threads early, if we know that we'll use them.
+  if (FLAG_job_based_sweeping) platform->EnsureInitialized();
 #endif
 
   return isolate->Init(des);
 }
 
 
 void V8::TearDown() {
   Isolate* isolate = Isolate::Current();
   ASSERT(isolate->IsDefaultIsolate());
   if (!isolate->IsInitialized()) return;
@@ skipping 135 matching lines @@
   platform_ = NULL;
 }
 
 
 v8::Platform* V8::GetCurrentPlatform() {
   ASSERT(platform_);
   return platform_;
 }
 
 } }  // namespace v8::internal