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+------------------------------------------------------------------------------
+-- --
+-- GNAT RUN-TIME COMPONENTS --
+-- --
+-- A D A . E X E C U T I O N _ T I M E . T I M E R S --
+-- --
+-- S p e c --
+-- --
+-- This specification is derived from the Ada Reference Manual for use with --
+-- GNAT. In accordance with the copyright of that document, you can freely --
+-- copy and modify this specification, provided that if you redistribute a --
+-- modified version, any changes that you have made are clearly indicated. --
+-- --
+------------------------------------------------------------------------------
+
+-- This unit is not implemented in typical GNAT implementations that lie on
+-- top of operating systems, because it is infeasible to implement in such
+-- environments.
+
+-- If a target environment provides appropriate support for this package,
+-- then the Unimplemented_Unit pragma should be removed from this spec and
+-- an appropriate body provided.
+
+with System;
+
+package Ada.Execution_Time.Timers is
+ pragma Preelaborate;
+
+ pragma Unimplemented_Unit;
+
+ type Timer (T : not null access constant Ada.Task_Identification.Task_Id) is
+ tagged limited private;
+
+ type Timer_Handler is access protected procedure (TM : in out Timer);
+
+ Min_Handler_Ceiling : constant System.Any_Priority := System.Priority'Last;
+
+ procedure Set_Handler
+ (TM : in out Timer;
+ In_Time : Ada.Real_Time.Time_Span;
+ Handler : Timer_Handler);
+
+ procedure Set_Handler
+ (TM : in out Timer;
+ At_Time : CPU_Time;
+ Handler : Timer_Handler);
+
+ function Current_Handler (TM : Timer) return Timer_Handler;
+
+ procedure Cancel_Handler
+ (TM : in out Timer;
+ Cancelled : out Boolean);
+
+ function Time_Remaining (TM : Timer) return Ada.Real_Time.Time_Span;
+
+ Timer_Resource_Error : exception;
+
+private
+ type Timer (T : access Ada.Task_Identification.Task_Id) is
+ tagged limited null record;
+end Ada.Execution_Time.Timers;