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32d0add0 | 1 | -- Copyright 2008-2015 Free Software Foundation, Inc. |
9c1137ad JB |
2 | -- |
3 | -- This program is free software; you can redistribute it and/or modify | |
4 | -- it under the terms of the GNU General Public License as published by | |
5 | -- the Free Software Foundation; either version 3 of the License, or | |
6 | -- (at your option) any later version. | |
7 | -- | |
8 | -- This program is distributed in the hope that it will be useful, | |
9 | -- but WITHOUT ANY WARRANTY; without even the implied warranty of | |
10 | -- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
11 | -- GNU General Public License for more details. | |
12 | -- | |
13 | -- You should have received a copy of the GNU General Public License | |
14 | -- along with this program. If not, see <http://www.gnu.org/licenses/>. | |
15 | ||
16 | package body Pck is | |
17 | ||
18 | type Data_T is (One, Two, Three); | |
19 | pragma Atomic (Data_T); | |
20 | ||
21 | Data_Flag : Data_T := One; | |
22 | ||
23 | procedure Increment is | |
24 | begin | |
25 | if Data_Flag = Data_T'Last then | |
26 | Data_Flag := Data_T'First; | |
27 | else | |
28 | Data_Flag := Data_T'Succ (Data_Flag); | |
29 | end if; | |
30 | end Increment; | |
31 | ||
32 | function Is_First return Boolean is | |
33 | begin | |
34 | return Data_Flag = Data_T'First; | |
35 | end Is_First; | |
36 | ||
37 | end Pck; |