File : g-boubuf.adb
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 -- --
19 -- --
20 -- --
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
31 package 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
90 end GNAT.Bounded_Buffers;