Next: Summary of Pragma Shared_Passive, Previous: Overview of Pragma Shared_Passive, Up: Pragma Shared_Passive

##### 8.1.6.2 Shared and Protected Objects

In the code below, we define two kinds of shared objects. External_Synchronization requires that the different partitions updating this data synchronize to avoid conflicting operations on shared objects. Internal_Synchronization provides a way to get an atomic operation on shared objects. Note that only entryless protected types are allowed in a shared passive unit; synchronization must be done with protected procedures.

         package SharedObjects is
            pragma Shared_Passive;

            Max : Positive := 10;
            type Index_Type is range 1 .. Max;
            type Rate_Type is new Float;

            type Rates_Type is array (Index_Type) of Rate_Type;

            External_Synchronization : Rates_Type;

            protected Internal_Synchronization is
               procedure Set
                 (Index : in Index_Type;
                  Rate  : in Rate_Type);

               procedure Get
                 (Index : in Index_Type;
                  Rate  : out Rate_Type);
            private
            --  implementation removed
         end SharedObjects;