Tenant-Centric Attribute Semantic Access Control Policy Model for the Cloud Service Platform

Algorithm 4

Attribute synchronization algorithm (ASA).

Input:  or

Output: Performing the update operation

1: IF the attribute or its value is changed

2:  IF the attribute or its value is invoked

3:    

4:    Executing P_Operation ()

5:    Executing V_Operation ()

6:  ELSE

7:    

8:    Executing P_Operation ()

9:    Executing V_Operation ()

10:  END IF

11: END IF

12: P_Operation (: Semaphore)

13:  

14:  IF

15:    Wait ()

16:  ELSE

17:   Performing the update operation

18:  END IF

19: END P_Operation

20: V_Operation (: Semaphore)

21:  

22:  IF

23:    Resume ()

24:    Performing the update operation

25:  ELSE

26:    Releasing the update operation

27:  END IF

28: END V_Operation