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04277e02 | 1 | /* Copyright (C) 2003-2019 Free Software Foundation, Inc. |
69cae3cf | 2 | This file is part of the GNU C Library. |
4009bf40 | 3 | Contributed by Ulrich Drepper <drepper@redhat.com>, 2003. |
69cae3cf UD |
4 | |
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Lesser General Public | |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser General Public | |
59ba27a6 | 16 | License along with the GNU C Library; if not, see |
5a82c748 | 17 | <https://www.gnu.org/licenses/>. */ |
69cae3cf | 18 | |
de071d19 JM |
19 | #ifndef _ATOMIC_MACHINE_H |
20 | #define _ATOMIC_MACHINE_H 1 | |
4009bf40 UD |
21 | |
22 | /* We have by default no support for atomic operations. So define | |
23 | them non-atomic. If this is a problem somebody will have to come | |
24 | up with real definitions. */ | |
25 | ||
26 | /* The only basic operation needed is compare and exchange. */ | |
d15851ec RM |
27 | #define atomic_compare_and_exchange_val_acq(mem, newval, oldval) \ |
28 | ({ __typeof (mem) __gmemp = (mem); \ | |
29 | __typeof (*mem) __gret = *__gmemp; \ | |
30 | __typeof (*mem) __gnewval = (newval); \ | |
31 | \ | |
32 | if (__gret == (oldval)) \ | |
33 | *__gmemp = __gnewval; \ | |
34 | __gret; }) | |
35 | ||
36 | #define atomic_compare_and_exchange_bool_acq(mem, newval, oldval) \ | |
37 | ({ __typeof (mem) __gmemp = (mem); \ | |
38 | __typeof (*mem) __gnewval = (newval); \ | |
39 | \ | |
40 | *__gmemp == (oldval) ? (*__gmemp = __gnewval, 0) : 1; }) | |
4009bf40 | 41 | |
de071d19 | 42 | #endif /* atomic-machine.h */ |