Safepoint interface and unit tests.

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 "vm/base_isolate.h"
@@ skipping 309 matching lines @@
   bool GetProfilerStackBounds(uword* lower, uword* upper) const;
 
   static uword GetSpecifiedStackSize();
 
   static const intptr_t kStackSizeBuffer = (4 * KB * kWordSize);
 
   // Interrupt bits.
   enum {
     kApiInterrupt = 0x1,      // An interrupt from Dart_InterruptIsolate.
     kMessageInterrupt = 0x2,  // An interrupt to process an out of band message.
-    kStoreBufferInterrupt = 0x4,  // An interrupt to process the store buffer.
+    kVMInterrupt = 0x4,  // Internal VM checks: safepoints, store buffers, etc.
 
     kInterruptsMask =
         kApiInterrupt |
         kMessageInterrupt |
-        kStoreBufferInterrupt,
+        kVMInterrupt,
   };
 
   void ScheduleInterrupts(uword interrupt_bits);
   uword GetAndClearInterrupts();
 
   // Marks all libraries as loaded.
   void DoneLoading();
 
   bool MakeRunnable();
   void Run();
@@ skipping 718 matching lines @@
   uint8_t* serialized_message_;
   intptr_t serialized_message_len_;
   Isolate::Flags isolate_flags_;
   bool paused_;
   bool errors_are_fatal_;
 };
 
 }  // namespace dart
 
 #endif  // VM_ISOLATE_H_