VM thread shutdown.

runtime/vm/isolate.h

Index: runtime/vm/isolate.h
diff --git a/runtime/vm/isolate.h b/runtime/vm/isolate.h
index 5dd7085192de2ea183d243b8dac9b48e70a455df..c75a852dc2a2f8574a0fc05f48fe75e96a52aea5 100644
--- a/runtime/vm/isolate.h
+++ b/runtime/vm/isolate.h
@@ -758,8 +758,15 @@ class Isolate : public BaseIsolate {
 
   bool is_service_isolate() const { return is_service_isolate_; }
 
+  static void KillAllIsolates();
+  static void KillIfExists(Isolate* isolate);
+
+  static void DisableIsolateCreation();
+  static void EnableIsolateCreation();
+
  private:
   friend class Dart;  // Init, InitOnce, Shutdown.
+  friend class IsolateKillerVisitor;  // Kill().
 
   explicit Isolate(const Dart_IsolateFlags& api_flags);
 
@@ -767,6 +774,11 @@ class Isolate : public BaseIsolate {
   static Isolate* Init(const char* name_prefix,
                        const Dart_IsolateFlags& api_flags,
                        bool is_vm_isolate = false);
+
+  // The isolates_list_monitor_ should be held when calling Kill().
+  void Kill();

[Ivan Posva, 2015/09/15 16:18:42]

KillLocked to indicate that the lock should be held. Such as in
TryAllocateLocked.

+
+  void LowLevelShutdown();
   void Shutdown();
   // Assumes mutator is the only thread still in the isolate.
   void CloseAllTimelineBlocks();
@@ -961,11 +973,13 @@ class Isolate : public BaseIsolate {
   static void WakePauseEventHandler(Dart_Isolate isolate);
 
   // Manage list of existing isolates.
-  static void AddIsolateTolist(Isolate* isolate);
+  static bool AddIsolateToList(Isolate* isolate);
   static void RemoveIsolateFromList(Isolate* isolate);
 
-  static Monitor* isolates_list_monitor_;  // Protects isolates_list_head_
+  // This monitor protects isolates_list_head_, and creation_enabled_.
+  static Monitor* isolates_list_monitor_;
   static Isolate* isolates_list_head_;
+  static bool creation_enabled_;
 
 #define REUSABLE_FRIEND_DECLARATION(name)                                      \
   friend class Reusable##name##HandleScope;