1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT RUN-TIME COMPONENTS                         --
4--                                                                          --
5--             A D A . E X E C U T I O N _ T I M E . T I M E R S            --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9-- This specification is derived from the Ada Reference Manual for use with --
10-- GNAT.  In accordance with the copyright of that document, you can freely --
11-- copy and modify this specification,  provided that if you redistribute a --
12-- modified version,  any changes that you have made are clearly indicated. --
13--                                                                          --
14------------------------------------------------------------------------------
15
16--  This unit is not implemented in typical GNAT implementations that lie on
17--  top of operating systems, because it is infeasible to implement in such
18--  environments.
19
20--  If a target environment provides appropriate support for this package,
21--  then the Unimplemented_Unit pragma should be removed from this spec and
22--  an appropriate body provided.
23
24with System;
25
26package Ada.Execution_Time.Timers is
27   pragma Preelaborate;
28
29   pragma Unimplemented_Unit;
30
31   type Timer (T : not null access constant Ada.Task_Identification.Task_Id) is
32      tagged limited private;
33
34   type Timer_Handler is access protected procedure (TM : in out Timer);
35
36   Min_Handler_Ceiling : constant System.Any_Priority := System.Priority'Last;
37
38   procedure Set_Handler
39     (TM      : in out Timer;
40      In_Time : Ada.Real_Time.Time_Span;
41      Handler : Timer_Handler);
42
43   procedure Set_Handler
44     (TM      : in out Timer;
45      At_Time : CPU_Time;
46      Handler : Timer_Handler);
47
48   function Current_Handler (TM : Timer) return Timer_Handler;
49
50   procedure Cancel_Handler
51     (TM        : in out Timer;
52      Cancelled : out Boolean);
53
54   function Time_Remaining (TM : Timer) return Ada.Real_Time.Time_Span;
55
56   Timer_Resource_Error : exception;
57
58private
59   type Timer (T : access Ada.Task_Identification.Task_Id) is
60      tagged limited null record;
61end Ada.Execution_Time.Timers;
62