Alive thread implemented

shm.h

@@ -17,8 +17,9 @@ private:
 
 public:
     void post();
-    void wait();
+    bool wait(int ms);
     bool trywait();
+    void takeOwnership();
 
 public:
     ShmSem(const char *n, bool owner);
@@ -52,6 +53,9 @@ public:
 public:
     void *ref(int place);
 
+public:
+    void takeOwnership();
+
 public:
     void info(int &usage, int &free_depth, int &free_size, int &item_depth, int &item_size, double &usage_factor);