Add session manager

src/session/session_private.h

@@ -10,18 +10,11 @@ extern "C"
 {
 #endif
 
+#include "timeout.h"
 #include "uthash.h"
 #include "session.h"
 #include "session_address.h"
 
-#define TIMEOUT_CB_OVERRIDE
-struct timeout_cb
-{
-    session_expire_cb fn;
-    struct session *arg;
-};
-#include "timeout.h"
-
 #define EX_DATA_MAX_COUNT 128
 #define SESSION_EVENT_QUEUE_SIZE 256
 
@@ -72,7 +65,9 @@ struct session
 
     // session timer
     struct timeout timeout;
-    uint64_t abs_expire_ts;
+    session_expire_cb expire_cb;
+    void *expire_arg;
+    uint64_t expire_abs_ts;
 
     /******************************
      * Session Pool Zone