1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174 | ------------------------------------------------------------------------------
-- --
-- GNAT LIBRARY COMPONENTS --
-- --
-- ADA.CONTAINERS.UNBOUNDED_SYNCHRONIZED_QUEUES --
-- --
-- B o d y --
-- --
-- Copyright (C) 2011-2022, Free Software Foundation, Inc. --
-- --
-- GNAT is free software; you can redistribute it and/or modify it under --
-- terms of the GNU General Public License as published by the Free Soft- --
-- ware Foundation; either version 3, or (at your option) any later ver- --
-- sion. GNAT is distributed in the hope that it will be useful, but WITH- --
-- OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY --
-- or FITNESS FOR A PARTICULAR PURPOSE. --
-- --
-- As a special exception under Section 7 of GPL version 3, you are granted --
-- additional permissions described in the GCC Runtime Library Exception, --
-- version 3.1, as published by the Free Software Foundation. --
-- --
-- You should have received a copy of the GNU General Public License and --
-- a copy of the GCC Runtime Library Exception along with this program; --
-- see the files COPYING3 and COPYING.RUNTIME respectively. If not, see --
-- <http://www.gnu.org/licenses/>. --
-- --
-- This unit was originally developed by Matthew J Heaney. --
------------------------------------------------------------------------------
with Ada.Unchecked_Deallocation;
package body Ada.Containers.Unbounded_Synchronized_Queues is
package body Implementation is
-----------------------
-- Local Subprograms --
-----------------------
procedure Free is
new Ada.Unchecked_Deallocation (Node_Type, Node_Access);
-------------
-- Dequeue --
-------------
procedure Dequeue
(List : in out List_Type;
Element : out Queue_Interfaces.Element_Type)
is
X : Node_Access;
begin
Element := List.First.Element;
X := List.First;
List.First := List.First.Next;
if List.First = null then
List.Last := null;
end if;
List.Length := List.Length - 1;
Free (X);
end Dequeue;
-------------
-- Enqueue --
-------------
procedure Enqueue
(List : in out List_Type;
New_Item : Queue_Interfaces.Element_Type)
is
Node : Node_Access;
begin
Node := new Node_Type'(New_Item, null);
if List.First = null then
List.First := Node;
List.Last := List.First;
else
List.Last.Next := Node;
List.Last := Node;
end if;
List.Length := List.Length + 1;
if List.Length > List.Max_Length then
List.Max_Length := List.Length;
end if;
end Enqueue;
--------------
-- Finalize --
--------------
procedure Finalize (List : in out List_Type) is
X : Node_Access;
begin
while List.First /= null loop
X := List.First;
List.First := List.First.Next;
Free (X);
end loop;
end Finalize;
------------
-- Length --
------------
function Length (List : List_Type) return Count_Type is
begin
return List.Length;
end Length;
----------------
-- Max_Length --
----------------
function Max_Length (List : List_Type) return Count_Type is
begin
return List.Max_Length;
end Max_Length;
end Implementation;
protected body Queue is
-----------------
-- Current_Use --
-----------------
function Current_Use return Count_Type is
begin
return List.Length;
end Current_Use;
-------------
-- Dequeue --
-------------
entry Dequeue (Element : out Queue_Interfaces.Element_Type)
when List.Length > 0
is
begin
List.Dequeue (Element);
end Dequeue;
-------------
-- Enqueue --
-------------
entry Enqueue (New_Item : Queue_Interfaces.Element_Type) when True is
begin
List.Enqueue (New_Item);
end Enqueue;
--------------
-- Peak_Use --
--------------
function Peak_Use return Count_Type is
begin
return List.Max_Length;
end Peak_Use;
end Queue;
end Ada.Containers.Unbounded_Synchronized_Queues;
|