projects / thirdparty / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| 26e7e1a0 AC |
1 | ------------------------------------------------------------------------------ |
| 2 | -- -- | |
| 3 | -- GNAT RUN-TIME COMPONENTS -- | |
| 4 | -- -- | |
| 5 | -- S Y S T E M . A T O M I C _ C O U N T E R S -- | |
| 6 | -- -- | |
| 7 | -- B o d y -- | |
| 8 | -- -- | |
| 4b490c1e | 9 | -- Copyright (C) 2011-2020, Free Software Foundation, Inc. -- |
| 26e7e1a0 AC |
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 was originally developed by the GNAT team at New York University. -- | |
| 28 | -- Extensive contributions were provided by Ada Core Technologies Inc. -- | |
| 29 | -- -- | |
| 30 | ------------------------------------------------------------------------------ | |
| 31 | ||
| d29f68cf AC |
32 | -- This is version of the package, for use on platforms where this capability |
| 33 | -- is not supported. All Atomic_Counter operations raises Program_Error, | |
| 34 | -- Atomic_Unsigned operations processed in non-atomic manner. | |
| 26e7e1a0 AC |
35 | |
| 36 | package body System.Atomic_Counters is | |
| 37 | ||
| 26e7e1a0 AC |
38 | --------------- |
| 39 | -- Decrement -- | |
| 40 | --------------- | |
| 41 | ||
| 42 | function Decrement (Item : in out Atomic_Counter) return Boolean is | |
| 43 | begin | |
| 0319cacc AC |
44 | raise Program_Error; |
| 45 | return False; | |
| 26e7e1a0 AC |
46 | end Decrement; |
| 47 | ||
| 36f2e3d3 AC |
48 | function Decrement (Item : aliased in out Atomic_Unsigned) return Boolean is |
| 49 | begin | |
| 50 | -- Could not use Item := Item - 1; because it is disabled in spec. | |
| 51 | Item := Atomic_Unsigned'Pred (Item); | |
| 52 | return Item = 0; | |
| 53 | end Decrement; | |
| 54 | ||
| 55 | procedure Decrement (Item : aliased in out Atomic_Unsigned) is | |
| 56 | begin | |
| 57 | Item := Atomic_Unsigned'Pred (Item); | |
| 58 | end Decrement; | |
| 59 | ||
| 26e7e1a0 AC |
60 | --------------- |
| 61 | -- Increment -- | |
| 62 | --------------- | |
| 63 | ||
| 64 | procedure Increment (Item : in out Atomic_Counter) is | |
| 65 | begin | |
| 0319cacc | 66 | raise Program_Error; |
| 26e7e1a0 AC |
67 | end Increment; |
| 68 | ||
| 36f2e3d3 AC |
69 | procedure Increment (Item : aliased in out Atomic_Unsigned) is |
| 70 | begin | |
| 71 | Item := Atomic_Unsigned'Succ (Item); | |
| 72 | end Increment; | |
| 73 | ||
| 0c5dba7f AC |
74 | ---------------- |
| 75 | -- Initialize -- | |
| 76 | ---------------- | |
| 77 | ||
| 78 | procedure Initialize (Item : out Atomic_Counter) is | |
| 79 | begin | |
| 80 | raise Program_Error; | |
| 81 | end Initialize; | |
| 82 | ||
| 26e7e1a0 AC |
83 | ------------ |
| 84 | -- Is_One -- | |
| 85 | ------------ | |
| 86 | ||
| 87 | function Is_One (Item : Atomic_Counter) return Boolean is | |
| 88 | begin | |
| 0319cacc AC |
89 | raise Program_Error; |
| 90 | return False; | |
| 26e7e1a0 AC |
91 | end Is_One; |
| 92 | ||
| 93 | end System.Atomic_Counters; |