Safepoint interface and unit tests.

runtime/vm/store_buffer.h

 // Copyright (c) 2012, 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_STORE_BUFFER_H_
 #define VM_STORE_BUFFER_H_
 
 #include "platform/assert.h"
 #include "vm/globals.h"
 
@@ skipping 79 matching lines @@
   // takes ownership of the returned block.
   StoreBufferBlock* PopBlock();
   StoreBufferBlock* PopEmptyBlock();
 
   // Pops and returns all non-empty blocks as a linked list (owned by caller).
   StoreBufferBlock* Blocks();
 
   // Discards the contents of this store buffer.
   void Reset();
 
+  // Check whether non-empty blocks have exceeded kMaxNonEmpty.
+  bool Overflowed();
+
  private:
   class List {
    public:
     List() : head_(NULL), length_(0) {}
     ~List();
     void Push(StoreBufferBlock* block);
     StoreBufferBlock* Pop();
     intptr_t length() const { return length_; }
     bool IsEmpty() const { return head_ == NULL; }
     StoreBufferBlock* PopAll();
    private:
     StoreBufferBlock* head_;
     intptr_t length_;
     DISALLOW_COPY_AND_ASSIGN(List);
   };
 
-  // Check if we run over the max number of deduplication sets.
-  // If we did schedule an interrupt.
-  void CheckThresholdNonEmpty();
-
   // If needed, trims the the global cache of empty blocks.
   static void TrimGlobalEmpty();
 
   List full_;
   List partial_;
   Mutex* mutex_;
 
   static const intptr_t kMaxGlobalEmpty = 100;
   static List* global_empty_;
   static Mutex* global_mutex_;
 
   DISALLOW_COPY_AND_ASSIGN(StoreBuffer);
 };
 
 }  // namespace dart
 
 #endif  // VM_STORE_BUFFER_H_