Added a run state field to Isolate

runtime/vm/isolate.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef VM_ISOLATE_H_
 #define VM_ISOLATE_H_
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/thread.h"
@@ skipping 255 matching lines @@
     kStoreBufferInterrupt = 0x4,  // An interrupt to process the store buffer.
     kVmStatusInterrupt = 0x8,     // An interrupt to process a status request.
 
     kInterruptsMask =
         kApiInterrupt |
         kMessageInterrupt |
         kStoreBufferInterrupt |
         kVmStatusInterrupt,
   };
 
+  enum IsolateRunState {
+    kIsolateWaiting = 0,      // The isolate is waiting for code to execute.
+    kIsolateRunning,          // The isolate is executing code.
+  };
+
   void ScheduleInterrupts(uword interrupt_bits);
   uword GetAndClearInterrupts();
 
   bool MakeRunnable();
   void Run();
 
   MessageHandler* message_handler() const { return message_handler_; }
   void set_message_handler(MessageHandler* value) { message_handler_ = value; }
 
   bool is_runnable() const { return is_runnable_; }
   void set_is_runnable(bool value) { is_runnable_ = value; }
 
+  IsolateRunState running_state() const { return running_state_; }
+  void set_running_state(IsolateRunState value) { running_state_ = value; }
+
   uword spawn_data() const { return spawn_data_; }
   void set_spawn_data(uword value) { spawn_data_ = value; }
 
   static const intptr_t kNoDeoptId = -1;
   static const intptr_t kDeoptIdStep = 2;
   static const intptr_t kDeoptIdBeforeOffset = 0;
   static const intptr_t kDeoptIdAfterOffset = 1;
   intptr_t deopt_id() const { return deopt_id_; }
   void set_deopt_id(int value) {
     ASSERT(value >= 0);
@@ skipping 187 matching lines @@
   LongJump* long_jump_base_;
   TimerList timer_list_;
   intptr_t deopt_id_;
   RawArray* ic_data_array_;
   Mutex* mutex_;  // protects stack_limit_ and saved_stack_limit_.
   uword stack_limit_;
   uword saved_stack_limit_;
   MessageHandler* message_handler_;
   uword spawn_data_;
   bool is_runnable_;
+  IsolateRunState running_state_;
   GcPrologueCallbacks gc_prologue_callbacks_;
   GcEpilogueCallbacks gc_epilogue_callbacks_;
 
   // Deoptimization support.
   intptr_t* deopt_cpu_registers_copy_;
   fpu_register_t* deopt_fpu_registers_copy_;
   intptr_t* deopt_frame_copy_;
   intptr_t deopt_frame_copy_size_;
   DeferredObject* deferred_objects_;
 
@@ skipping 95 matching lines @@
   void Cleanup();
 
  private:
   Isolate* isolate_;
   char* script_url_;
   char* library_url_;
   char* function_name_;
   char* exception_callback_name_;
 };
 
+
+class IsolateRunStateManager : public StackResource {
+ public:
+  explicit IsolateRunStateManager()
+      : StackResource(Isolate::Current()),
+        saved_state_(Isolate::kIsolateWaiting) {
+    saved_state_ = reinterpret_cast<Isolate*>(isolate())->running_state();
+  }
+
+  virtual ~IsolateRunStateManager() {
+    reinterpret_cast<Isolate*>(isolate())->set_running_state(saved_state_);
+  }
+
+  void SetRunState(Isolate::IsolateRunState run_state) {
+    reinterpret_cast<Isolate*>(isolate())->set_running_state(run_state);
+  }
+
+ private:
+  Isolate::IsolateRunState saved_state_;
+
+  DISALLOW_COPY_AND_ASSIGN(IsolateRunStateManager);
+};
+
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_