Run Crankshaft on a separate thread.

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 1014 matching lines @@
     return date_cache_;
   }
 
   void set_date_cache(DateCache* date_cache) {
     if (date_cache != date_cache_) {
       delete date_cache_;
     }
     date_cache_ = date_cache;
   }
 
+  bool to_delete() { return to_delete_; }
+
  private:
   Isolate();
 
   friend struct GlobalState;
   friend struct InitializeGlobalState;
 
   enum State {
     UNINITIALIZED,    // Some components may not have been allocated.
     INITIALIZED       // All components are fully initialized.
   };
@@ skipping 76 matching lines @@
 
   // Initializes the current thread to run this Isolate.
   // Not thread-safe. Multiple threads should not Enter/Exit the same isolate
   // at the same time, this should be prevented using external locking.
   void Enter();
 
   // Exits the current thread. The previosuly entered Isolate is restored
   // for the thread.
   // Not thread-safe. Multiple threads should not Enter/Exit the same isolate
   // at the same time, this should be prevented using external locking.
-  void Exit();
+  // When using --concurrent_crankshaft, the Entry and Exit methods
+  // need to automatically lock and unlock the isolate, except in one
+  // edge-case, when we call Exit(false)

[danno, 2012/05/22 10:32:19]

Can you be more explicit why this case happens?

+  void Exit(bool auto_unlock = true);
 
   void PreallocatedMemoryThreadStart();
   void PreallocatedMemoryThreadStop();
   void InitializeThreadLocal();
 
   void PrintStackTrace(FILE* out, ThreadLocalTop* thread);
   void MarkCompactPrologue(bool is_compacting,
                            ThreadLocalTop* archived_thread_data);
   void MarkCompactEpilogue(bool is_compacting,
                            ThreadLocalTop* archived_thread_data);
@@ skipping 66 matching lines @@
   DateCache* date_cache_;
   unibrow::Mapping<unibrow::Ecma262Canonicalize> interp_canonicalize_mapping_;
 
   // The garbage collector should be a little more aggressive when it knows
   // that a context was recently exited.
   bool context_exit_happened_;
 
   // Time stamp at initialization.
   double time_millis_at_init_;
 
+  // The crankshaft thread should delete this isolate when it sees it
+  // next (and also not compile anything in it).
+  bool to_delete_;
+
+  List<bool> lock_history_;
+
 #if defined(V8_TARGET_ARCH_ARM) && !defined(__arm__) || \
     defined(V8_TARGET_ARCH_MIPS) && !defined(__mips__)
   bool simulator_initialized_;
   HashMap* simulator_i_cache_;
   Redirection* simulator_redirection_;
 #endif
 
 #ifdef DEBUG
   // A static array of histogram info for each type.
   HistogramInfo heap_histograms_[LAST_TYPE + 1];
@@ skipping 20 matching lines @@
   // This class is huge and has a number of fields controlled by
   // preprocessor defines. Make sure the offsets of these fields agree
   // between compilation units.
 #define ISOLATE_FIELD_OFFSET(type, name, ignored)                              \
   static const intptr_t name##_debug_offset_;
   ISOLATE_INIT_LIST(ISOLATE_FIELD_OFFSET)
   ISOLATE_INIT_ARRAY_LIST(ISOLATE_FIELD_OFFSET)
 #undef ISOLATE_FIELD_OFFSET
 #endif
 
+  friend class CrankshaftThread;
   friend class ExecutionAccess;
   friend class IsolateInitializer;
   friend class ThreadManager;
   friend class Simulator;
   friend class StackGuard;
   friend class ThreadId;
   friend class TestMemoryAllocatorScope;
   friend class v8::Isolate;
   friend class v8::Locker;
   friend class v8::Unlocker;
@@ skipping 138 matching lines @@
 
 // Mark the global context with out of memory.
 inline void Context::mark_out_of_memory() {
   global_context()->set_out_of_memory(HEAP->true_value());
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_ISOLATE_H_