rcu_freed base class. need to convert all RCU users to new interface

before we can use it, which also requires convering all namespace users to templatized namespace..

rcu_freed base class. need to convert all RCU users to new interface
fc190687 · Nickolai Zeldovich · c84b6d9c · fc190687 · fc190687 · fc190687
--- a/Makefile
+++ b/Makefile
@@ -26,7 +26,7 @@ COMFLAGS := -fno-pic -static -fno-builtin -fno-strict-aliasing -O2 -Wall \
 	    -DHW_$(HW) -include param.h -include compiler.h
 COMFLAGS += $(shell $(CC) -fno-stack-protector -E -x c /dev/null >/dev/null 2>&1 && echo -fno-stack-protector)
 CFLAGS   := $(COMFLAGS) -std=c99
-CXXFLAGS := $(COMFLAGS) -std=c++0x -Wno-sign-compare -fno-exceptions
+CXXFLAGS := $(COMFLAGS) -std=c++0x -Wno-sign-compare -fno-exceptions -fno-rtti
 ASFLAGS = -m64 -gdwarf-2 -MD
 LDFLAGS += -m elf_x86_64


--- a/gc.cc
+++ b/gc.cc
@@ -336,3 +336,10 @@ initgc(void)
    release(&gcp->lock);
  }
 }
+
+void
+del_rcu_freed(void *arg)
+{
+  rcu_freed *rf = (rcu_freed*) arg;
+  delete rf;
+}
--- a/gc.hh
+++ b/gc.hh
+#pragma once
+
+class rcu_freed {
+ private:
+  u64 _rcu_epoch;
+  rcu_freed *_rcu_next;
+
+ public:
+  virtual ~rcu_freed() {}
+};
+
+void del_rcu_freed(void*);
--- a/ns.hh
+++ b/ns.hh
 #pragma once

+#include "gc.hh"
+
 // name spaces
 // XXX maybe use open hash table, no chain, better cache locality

@@ -16,7 +18,7 @@ class scoped_gc_epoch {
 };

 template<class K, class V>
-class xelem {
+class xelem : public rcu_freed {
 public:
  V val;
  int next_lock;
@@ -24,6 +26,7 @@ class xelem {
  K key;

  xelem(const K &k, const V &v) : val(v), next_lock(0), next(0), key(k) {}
+  virtual ~xelem() {}
 };

 template<class K, class V>
@@ -73,7 +76,7 @@ class xns {
      if (!allowdup) {
        for (auto x = root; x; x = x->next) {
          if (x->key == key) {
-            // XXX delete e;
+            gc_delayed(e, del_rcu_freed);
            return -1;
          }
        }
@@ -128,7 +131,7 @@ class xns {
          }

          *pelock = 0;
-          // XXX delete e;
+          gc_delayed(e, del_rcu_freed);
          return true;
        }