[platform] Implement a worker pool

src/isolate.h

 // 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 1068 matching lines @@
       code_stub_interface_descriptor(int index);
 
   void IterateDeferredHandles(ObjectVisitor* visitor);
   void LinkDeferredHandles(DeferredHandles* deferred_handles);
   void UnlinkDeferredHandles(DeferredHandles* deferred_handles);
 
 #ifdef DEBUG
   bool IsDeferredHandle(Object** location);
 #endif  // DEBUG
 
+  int max_available_threads() const {
+    return max_available_threads_;
+  }
+
   void set_max_available_threads(int value) {
     max_available_threads_ = value;
   }
 
   bool concurrent_recompilation_enabled() {
     // Thread is only available with flag enabled.
     ASSERT(optimizing_compiler_thread_ == NULL ||
            FLAG_concurrent_recompilation);
     return optimizing_compiler_thread_ != NULL;
   }
@@ skipping 467 matching lines @@
   }
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_