Per-isolate v8::Locker and v8::Unlocker

src/heap.h

 // Copyright 2010 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 1920 matching lines @@
 //
 // /* Allocation not allowed: we cannot handle a GC in this scope. */
 // { AssertNoAllocation nogc;
 //   ...
 // }
 
 #ifdef DEBUG
 
 class DisallowAllocationFailure {
  public:
-  DisallowAllocationFailure() {
-    old_state_ = HEAP->disallow_allocation_failure_;
-    HEAP->disallow_allocation_failure_ = true;
+  explicit DisallowAllocationFailure(Heap* heap) : heap_(heap) {

[Vitaly Repeshko, 2011/04/15 00:29:39]

Please don't waste time optimizing debug-only facilities.

+    old_state_ = heap_->disallow_allocation_failure_;
+    heap_->disallow_allocation_failure_ = true;
   }
   ~DisallowAllocationFailure() {
-    HEAP->disallow_allocation_failure_ = old_state_;
+    heap_->disallow_allocation_failure_ = old_state_;
   }
  private:
   bool old_state_;
+  Heap* heap_;
 };
 
 class AssertNoAllocation {
  public:
   AssertNoAllocation() {
     old_state_ = HEAP->allow_allocation(false);
   }
 
   ~AssertNoAllocation() {
     HEAP->allow_allocation(old_state_);
@@ skipping 295 matching lines @@
   DISALLOW_IMPLICIT_CONSTRUCTORS(PathTracer);
 };
 #endif  // DEBUG || LIVE_OBJECT_LIST
 
 
 } }  // namespace v8::internal
 
 #undef HEAP
 
 #endif  // V8_HEAP_H_