lib, src: don't make http parser handles weak

Weak handles put strain on the garbage collector and the parser handle
doesn't need to be weak in the first place.  This change should improve
GC times on busy servers a little.

Reviewed-by: Trevor Norris <trev.norris@gmail.com>

lib/_http_common.js

@@ -200,7 +200,8 @@ function freeParser(parser, req) {
       parser.socket.parser = null;
     parser.socket = null;
     parser.incoming = null;
-    parsers.free(parser);
+    if (parsers.free(parser) === false)
+      parser.close();
     parser = null;
   }
   if (req) {

lib/freelist.js

@@ -39,5 +39,7 @@ exports.FreeList.prototype.free = function(obj) {
   //debug("free " + this.name + " " + this.list.length);
   if (this.list.length < this.max) {
     this.list.push(obj);
+    return true;
   }
+  return false;
 };

src/node_http_parser.cc

@@ -169,12 +169,14 @@ class Parser : public BaseObject {
       : BaseObject(env, wrap),
         current_buffer_len_(0),
         current_buffer_data_(NULL) {
-    MakeWeak<Parser>(this);
+    Wrap(object(), this);
     Init(type);
   }
 
 
   ~Parser() {
+    ClearWrap(object());
+    persistent().Reset();
   }
 
 
@@ -357,6 +359,13 @@ class Parser : public BaseObject {
   }
 
 
+  static void Close(const FunctionCallbackInfo<Value>& args) {
+    HandleScope handle_scope(args.GetIsolate());
+    Parser* parser = Unwrap<Parser>(args.Holder());
+    delete parser;
+  }
+
+
   void Save() {
     url_.Save();
     status_message_.Save();
@@ -591,6 +600,7 @@ void InitHttpParser(Handle<Object> target,
 #undef V
   t->Set(FIXED_ONE_BYTE_STRING(env->isolate(), "methods"), methods);
 
+  NODE_SET_PROTOTYPE_METHOD(t, "close", Parser::Close);
   NODE_SET_PROTOTYPE_METHOD(t, "execute", Parser::Execute);
   NODE_SET_PROTOTYPE_METHOD(t, "finish", Parser::Finish);
   NODE_SET_PROTOTYPE_METHOD(t, "reinitialize", Parser::Reinitialize);