1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT LIBRARY COMPONENTS                          --
4--                                                                          --
5--               ADA.CONTAINERS.UNBOUNDED_SYNCHRONIZED_QUEUES               --
6--                                                                          --
7--                                 S p e c                                  --
8--                                                                          --
9--          Copyright (C) 2011-2018, Free Software Foundation, Inc.         --
10--                                                                          --
11-- This specification is derived from the Ada Reference Manual for use with --
12-- GNAT. The copyright notice above, and the license provisions that follow --
13-- apply solely to the  contents of the part following the private keyword. --
14--                                                                          --
15-- GNAT is free software;  you can  redistribute it  and/or modify it under --
16-- terms of the  GNU General Public License as published  by the Free Soft- --
17-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
18-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
19-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
20-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
21--                                                                          --
22-- As a special exception under Section 7 of GPL version 3, you are granted --
23-- additional permissions described in the GCC Runtime Library Exception,   --
24-- version 3.1, as published by the Free Software Foundation.               --
25--                                                                          --
26-- You should have received a copy of the GNU General Public License and    --
27-- a copy of the GCC Runtime Library Exception along with this program;     --
28-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
29-- <http://www.gnu.org/licenses/>.                                          --
30--                                                                          --
31-- This unit was originally developed by Matthew J Heaney.                  --
32------------------------------------------------------------------------------
33
34with System;
35with Ada.Containers.Synchronized_Queue_Interfaces;
36with Ada.Finalization;
37
38generic
39   with package Queue_Interfaces is
40     new Ada.Containers.Synchronized_Queue_Interfaces (<>);
41
42   Default_Ceiling : System.Any_Priority := System.Priority'Last;
43
44package Ada.Containers.Unbounded_Synchronized_Queues is
45   pragma Annotate (CodePeer, Skip_Analysis);
46   pragma Preelaborate;
47
48   package Implementation is
49
50      --  All identifiers in this unit are implementation defined
51
52      pragma Implementation_Defined;
53
54      type List_Type is tagged limited private;
55
56      procedure Enqueue
57        (List     : in out List_Type;
58         New_Item : Queue_Interfaces.Element_Type);
59
60      procedure Dequeue
61        (List    : in out List_Type;
62         Element : out Queue_Interfaces.Element_Type);
63
64      function Length (List : List_Type) return Count_Type;
65
66      function Max_Length (List : List_Type) return Count_Type;
67
68   private
69
70      type Node_Type;
71      type Node_Access is access Node_Type;
72
73      type Node_Type is limited record
74         Element : Queue_Interfaces.Element_Type;
75         Next    : Node_Access;
76      end record;
77
78      type List_Type is new Ada.Finalization.Limited_Controlled with record
79         First, Last : Node_Access;
80         Length      : Count_Type := 0;
81         Max_Length  : Count_Type := 0;
82      end record;
83
84      overriding procedure Finalize (List : in out List_Type);
85
86   end Implementation;
87
88   protected type Queue
89     (Ceiling : System.Any_Priority := Default_Ceiling)
90   with
91     Priority => Ceiling
92   is new Queue_Interfaces.Queue with
93
94      overriding entry Enqueue (New_Item : Queue_Interfaces.Element_Type);
95
96      overriding entry Dequeue (Element : out Queue_Interfaces.Element_Type);
97
98      overriding function Current_Use return Count_Type;
99
100      overriding function Peak_Use return Count_Type;
101
102   private
103      List : Implementation.List_Type;
104   end Queue;
105
106end Ada.Containers.Unbounded_Synchronized_Queues;
107