Destroy I2PControlSession before io_service, cancel waiting operations.

i2pcontrol/I2PControl.h

@@ -57,6 +57,7 @@ const char I2P_CONTROL_ROUTER_MANAGER_RESEED[] = "Reseed";
 /**
  * "Null" I2P control implementation, does not do actual networking.
  * @note authentication tokens are per-session
+ * @warning an I2PControlSession must be destroyed before its io_service
  */
 class I2PControlSession {
     
@@ -104,10 +105,19 @@ public:
 
     /**
      * Sets up the appropriate handlers.
-     * @param ios the parent io_service object
+     * @param ios the parent io_service object, must remain valid throughout
+     *  the lifetime of this I2PControlSession.
      */
     I2PControlSession(boost::asio::io_service& ios);
 
+    ~I2PControlSession();
+
+    /**
+     * Cancels all operations that are waiting.
+     * @note must not be called before destruction, destructor handles this
+     */
+    void stop();
+
     /**
      * Handle a json string with I2PControl instructions.
      */
@@ -120,7 +130,6 @@ private:
         const PropertyTree& pt, Response& results
     );
     typedef void (I2PControlSession::*RequestHandler)(Response& results);
-
     
     /**
      * Tries to authenticate by checking whether the given token is valid.