Release persistent handles inside v8 GC

ext/v8/gc.cc

@@ -38,5 +38,6 @@ namespace rr {
   }
   void GC::Init() {
     queue = new GC::Queue();
+    v8::V8::AddGCPrologueCallback(GC::Drain);
   }
 }

ext/v8/init.cc

@@ -9,6 +9,7 @@ using namespace rr;
 extern "C" {
   void Init_init() {
     GC::Init();
+    V8::Init();
     Context::Init();
     String::Init();
     Script::Init();

ext/v8/rr.h

@@ -116,6 +116,10 @@ public:
   static void Init();
 };
 
+class V8 {
+public:
+  static void Init();
+};
 
 VALUE defineClass(const char *name, VALUE superclass = rb_cObject);
 VALUE defineModule(const char *name);

ext/v8/v8.cc

@@ -0,0 +1,13 @@
+#include "rr.h"
+
+namespace rr {
+namespace {
+  VALUE IdleNotification(VALUE self) {
+    return v8::V8::IdleNotification() ? Qtrue : Qfalse;
+  }
+}
+void V8::Init() {
+  VALUE V8Class = defineClass("V8");
+  RR_DEFINE_SINGLETON_METHOD(V8Class, "IdleNotification", &IdleNotification, 0);
+}
+}

spec/mem/blunt_spec.rb

@@ -2,6 +2,9 @@ require 'spec_helper'
 
 describe "A Very blunt test to make sure that we aren't doing stupid leaks" do
   before do
+    #allocate a single context to make sure that v8 loads its snapshot and
+    #we pay the overhead.
+    V8::Context.new
     @start_memory = process_memory
     GC.stress = true
   end
@@ -9,12 +12,12 @@ describe "A Very blunt test to make sure that we aren't doing stupid leaks" do
   after do
     GC.stress = false
   end
-  it "won't leak the context" do
-    500.times do
-      # V8::Context.new
+  it "won't increase process memory by more than 20% no matter how many contexts we create" do
+    5000.times do
+       V8::Context.new
+       gc_completely
     end
-    gc_completely
-    process_memory.should <= @start_memory * 1.05
+    process_memory.should <= @start_memory * 1.2
   end
 
   def process_memory
@@ -22,7 +25,7 @@ describe "A Very blunt test to make sure that we aren't doing stupid leaks" do
   end
 
   def gc_completely
-
+    loop while !V8::C::V8::IdleNotification()
   end
 
 end