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1 | /* |
2 | * Copyright (c) 2015-16 David Lamparter, for NetDEF, Inc. | |
3 | * | |
4 | * Permission to use, copy, modify, and distribute this software for any | |
5 | * purpose with or without fee is hereby granted, provided that the above | |
6 | * copyright notice and this permission notice appear in all copies. | |
7 | * | |
8 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES | |
9 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
10 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
11 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
12 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
13 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
14 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
15 | */ | |
16 | ||
17 | #ifndef _FRRATOMIC_H | |
18 | #define _FRRATOMIC_H | |
19 | ||
20 | #ifdef HAVE_CONFIG_H | |
21 | #include "config.h" | |
22 | #endif | |
23 | ||
24 | #ifndef FRR_AUTOCONF_ATOMIC | |
25 | #error autoconf checks for atomic functions were not properly run | |
26 | #endif | |
27 | ||
28 | /* ISO C11 */ | |
29 | #ifdef HAVE_STDATOMIC_H | |
30 | #include <stdatomic.h> | |
31 | ||
32 | /* gcc 4.7 and newer */ | |
33 | #elif defined(HAVE___ATOMIC) | |
34 | ||
35 | #define _Atomic volatile | |
36 | ||
37 | #define memory_order_relaxed __ATOMIC_RELAXED | |
38 | #define memory_order_consume __ATOMIC_CONSUME | |
39 | #define memory_order_acquire __ATOMIC_ACQUIRE | |
40 | #define memory_order_release __ATOMIC_RELEASE | |
41 | #define memory_order_acq_rel __ATOMIC_ACQ_REL | |
42 | #define memory_order_seq_cst __ATOMIC_SEQ_CST | |
43 | ||
44 | #define atomic_load_explicit __atomic_load_n | |
45 | #define atomic_store_explicit __atomic_store_n | |
46 | #define atomic_exchange_explicit __atomic_exchange_n | |
47 | #define atomic_fetch_add_explicit __atomic_fetch_add | |
48 | #define atomic_fetch_sub_explicit __atomic_fetch_sub | |
49 | ||
50 | #define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, mem2) \ | |
51 | __atomic_compare_exchange_n(atom, expect, desire, 1, mem1, mem2) | |
52 | ||
53 | /* gcc 4.1 and newer, | |
54 | * clang 3.3 (possibly older) | |
55 | * | |
56 | * __sync_swap isn't in gcc's documentation, but clang has it | |
57 | * | |
58 | * note __sync_synchronize() | |
59 | */ | |
60 | #elif defined(HAVE___SYNC) | |
61 | ||
62 | #define _Atomic volatile | |
63 | ||
64 | #define memory_order_relaxed 0 | |
65 | #define memory_order_consume 0 | |
66 | #define memory_order_acquire 0 | |
67 | #define memory_order_release 0 | |
68 | #define memory_order_acq_rel 0 | |
69 | #define memory_order_seq_cst 0 | |
70 | ||
71 | #define atomic_load_explicit(ptr, mem) \ | |
72 | ({ __sync_synchronize(); \ | |
73 | typeof(*ptr) rval = __sync_fetch_and_add((ptr), 0); \ | |
74 | __sync_synchronize(); rval; }) | |
75 | #define atomic_store_explicit(ptr, val, mem) \ | |
76 | ({ __sync_synchronize(); \ | |
77 | *(ptr) = (val); \ | |
78 | __sync_synchronize(); (void)0; }) | |
79 | #ifdef HAVE___SYNC_SWAP | |
80 | #define atomic_exchange_explicit(ptr, val, mem) \ | |
81 | ({ __sync_synchronize(); \ | |
82 | typeof(*ptr) rval = __sync_swap((ptr, val), 0); \ | |
83 | __sync_synchronize(); rval; }) | |
84 | #else /* !HAVE___SYNC_SWAP */ | |
85 | #define atomic_exchange_explicit(ptr, val, mem) \ | |
86 | ({ typeof(ptr) _ptr = (ptr); typeof(val) _val = (val); \ | |
87 | __sync_synchronize(); \ | |
88 | typeof(*ptr) old1, old2 = __sync_fetch_and_add(_ptr, 0); \ | |
89 | do { \ | |
90 | old1 = old2; \ | |
91 | old2 = __sync_val_compare_and_swap (_ptr, old1, _val); \ | |
92 | } while (old1 != old2); \ | |
93 | __sync_synchronize(); \ | |
94 | old2; \ | |
95 | }) | |
96 | #endif /* !HAVE___SYNC_SWAP */ | |
97 | #define atomic_fetch_add_explicit(ptr, val, mem) \ | |
98 | ({ __sync_synchronize(); \ | |
99 | typeof(*ptr) rval = __sync_fetch_and_add((ptr), (val)); \ | |
100 | __sync_synchronize(); rval; }) | |
101 | #define atomic_fetch_sub_explicit(ptr, val, mem) \ | |
102 | ({ __sync_synchronize(); \ | |
103 | typeof(*ptr) rval = __sync_fetch_and_sub((ptr), (val)); \ | |
104 | __sync_synchronize(); rval; }) | |
105 | ||
106 | #define atomic_compare_exchange_weak_explicit(atom, expect, desire, mem1, mem2) \ | |
107 | ({ typeof(atom) _atom = (atom); typeof(expect) _expect = (expect); \ | |
108 | typeof(desire) _desire = (desire); \ | |
109 | __sync_synchronize(); \ | |
110 | typeof(*atom) rval = __sync_val_compare_and_swap(_atom, *_expect, _desire); \ | |
111 | __sync_synchronize(); \ | |
112 | bool ret = (rval == *_expect); *_expect = rval; ret; }) | |
113 | ||
114 | #else /* !HAVE___ATOMIC && !HAVE_STDATOMIC_H */ | |
115 | #error no atomic functions... | |
116 | #endif | |
117 | ||
118 | #endif /* _FRRATOMIC_H */ |