1------------------------------------------------------------------------------
2--                                                                          --
3--                         GNAT COMPILER COMPONENTS                         --
4--                                                                          --
5--                  G N A T . B O U N D E D _ B U F F E R S                 --
6--                                                                          --
7--                                 B o d y                                  --
8--                                                                          --
9--                     Copyright (C) 2003-2010, AdaCore                     --
10--                                                                          --
11-- GNAT is free software;  you can  redistribute it  and/or modify it under --
12-- terms of the  GNU General Public License as published  by the Free Soft- --
13-- ware  Foundation;  either version 3,  or (at your option) any later ver- --
14-- sion.  GNAT is distributed in the hope that it will be useful, but WITH- --
15-- OUT ANY WARRANTY;  without even the  implied warranty of MERCHANTABILITY --
16-- or FITNESS FOR A PARTICULAR PURPOSE.                                     --
17--                                                                          --
18-- As a special exception under Section 7 of GPL version 3, you are granted --
19-- additional permissions described in the GCC Runtime Library Exception,   --
20-- version 3.1, as published by the Free Software Foundation.               --
21--                                                                          --
22-- You should have received a copy of the GNU General Public License and    --
23-- a copy of the GCC Runtime Library Exception along with this program;     --
24-- see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see    --
25-- <http://www.gnu.org/licenses/>.                                          --
26--                                                                          --
27-- GNAT is maintained by Ada Core Technologies Inc (http://www.gnat.com).   --
28--                                                                          --
29------------------------------------------------------------------------------
30
31package body GNAT.Bounded_Buffers is
32
33   --------------------
34   -- Bounded_Buffer --
35   --------------------
36
37   protected body Bounded_Buffer is
38
39      ------------
40      -- Insert --
41      ------------
42
43      entry Insert (Item : Element) when Count /= Capacity is
44      begin
45         Values (Next_In) := Item;
46         Next_In := (Next_In mod Capacity) + 1;
47         Count := Count + 1;
48      end Insert;
49
50      ------------
51      -- Remove --
52      ------------
53
54      entry Remove (Item : out Element) when Count > 0 is
55      begin
56         Item := Values (Next_Out);
57         Next_Out := (Next_Out mod Capacity) + 1;
58         Count := Count - 1;
59      end Remove;
60
61      -----------
62      -- Empty --
63      -----------
64
65      function Empty return Boolean is
66      begin
67         return Count = 0;
68      end Empty;
69
70      ----------
71      -- Full --
72      ----------
73
74      function Full return Boolean is
75      begin
76         return Count = Capacity;
77      end Full;
78
79      ------------
80      -- Extent --
81      ------------
82
83      function Extent return Natural is
84      begin
85         return Count;
86      end Extent;
87
88   end Bounded_Buffer;
89
90end GNAT.Bounded_Buffers;
91