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04277e02 | 1 | /* Copyright (C) 2003-2019 Free Software Foundation, Inc. |
9c986f87 AS |
2 | This file is part of the GNU C Library. |
3 | ||
4 | The GNU C Library is free software; you can redistribute it and/or | |
5 | modify it under the terms of the GNU Lesser General Public | |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
8 | ||
9 | The GNU C Library is distributed in the hope that it will be useful, | |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
12 | Lesser General Public License for more details. | |
13 | ||
14 | You should have received a copy of the GNU Lesser General Public | |
ab84e3ff | 15 | License along with the GNU C Library. If not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
9c986f87 | 17 | |
de071d19 JM |
18 | #ifndef _ATOMIC_MACHINE_H |
19 | #define _ATOMIC_MACHINE_H 1 | |
9c986f87 AS |
20 | |
21 | #include <stdint.h> | |
22 | ||
23 | /* Coldfire has no atomic compare-and-exchange operation, and the | |
24 | kernel provides no userspace atomicity operations. Here we just | |
25 | use generic non-atomic implementations instead. */ | |
26 | ||
27 | typedef int8_t atomic8_t; | |
28 | typedef uint8_t uatomic8_t; | |
29 | typedef int_fast8_t atomic_fast8_t; | |
30 | typedef uint_fast8_t uatomic_fast8_t; | |
31 | ||
32 | typedef int16_t atomic16_t; | |
33 | typedef uint16_t uatomic16_t; | |
34 | typedef int_fast16_t atomic_fast16_t; | |
35 | typedef uint_fast16_t uatomic_fast16_t; | |
36 | ||
37 | typedef int32_t atomic32_t; | |
38 | typedef uint32_t uatomic32_t; | |
39 | typedef int_fast32_t atomic_fast32_t; | |
40 | typedef uint_fast32_t uatomic_fast32_t; | |
41 | ||
42 | typedef int64_t atomic64_t; | |
43 | typedef uint64_t uatomic64_t; | |
44 | typedef int_fast64_t atomic_fast64_t; | |
45 | typedef uint_fast64_t uatomic_fast64_t; | |
46 | ||
47 | typedef intptr_t atomicptr_t; | |
48 | typedef uintptr_t uatomicptr_t; | |
49 | typedef intmax_t atomic_max_t; | |
50 | typedef uintmax_t uatomic_max_t; | |
51 | ||
1ea339b6 TR |
52 | /* If we have just non-atomic operations, we can as well make them wide. */ |
53 | #define __HAVE_64B_ATOMICS 1 | |
54 | #define USE_ATOMIC_COMPILER_BUILTINS 0 | |
55 | ||
12d2dd70 SL |
56 | /* XXX Is this actually correct? */ |
57 | #define ATOMIC_EXCHANGE_USES_CAS 1 | |
58 | ||
9c986f87 AS |
59 | /* The only basic operation needed is compare and exchange. */ |
60 | #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ | |
61 | ({ __typeof (mem) __gmemp = (mem); \ | |
62 | __typeof (*mem) __gret = *__gmemp; \ | |
63 | __typeof (*mem) __gnewval = (newval); \ | |
64 | \ | |
65 | if (__gret == (oldval)) \ | |
66 | *__gmemp = __gnewval; \ | |
67 | __gret; }) | |
68 | ||
69 | #define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ | |
70 | ({ __typeof (mem) __gmemp = (mem); \ | |
71 | __typeof (*mem) __gnewval = (newval); \ | |
72 | \ | |
73 | *__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; }) | |
74 | ||
75 | #endif |