blob: 099b9f7ec8c69f4a3efbec84d9a8a967981fe771 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
//===-- sanitizer_atomic_clang_other.h --------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file is a part of ThreadSanitizer/AddressSanitizer runtime.
// Not intended for direct inclusion. Include sanitizer_atomic.h.
//
//===----------------------------------------------------------------------===//
#ifndef SANITIZER_ATOMIC_CLANG_OTHER_H
#define SANITIZER_ATOMIC_CLANG_OTHER_H
namespace __sanitizer {
INLINE void proc_yield(int cnt) {
__asm__ __volatile__("" ::: "memory");
}
template<typename T>
INLINE typename T::Type atomic_load(
const volatile T *a, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_consume
| memory_order_acquire | memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
typename T::Type v;
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
// Assume that aligned loads are atomic.
if (mo == memory_order_relaxed) {
v = a->val_dont_use;
} else if (mo == memory_order_consume) {
// Assume that processor respects data dependencies
// (and that compiler won't break them).
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__asm__ __volatile__("" ::: "memory");
} else if (mo == memory_order_acquire) {
__asm__ __volatile__("" ::: "memory");
v = a->val_dont_use;
__sync_synchronize();
} else { // seq_cst
// E.g. on POWER we need a hw fence even before the store.
__sync_synchronize();
v = a->val_dont_use;
__sync_synchronize();
}
} else {
// 64-bit load on 32-bit platform.
// Gross, but simple and reliable.
// Assume that it is not in read-only memory.
v = __sync_fetch_and_add(
const_cast<typename T::Type volatile *>(&a->val_dont_use), 0);
}
return v;
}
template<typename T>
INLINE void atomic_store(volatile T *a, typename T::Type v, memory_order mo) {
DCHECK(mo & (memory_order_relaxed | memory_order_release
| memory_order_seq_cst));
DCHECK(!((uptr)a % sizeof(*a)));
if (sizeof(*a) < 8 || sizeof(void*) == 8) {
// Assume that aligned loads are atomic.
if (mo == memory_order_relaxed) {
a->val_dont_use = v;
} else if (mo == memory_order_release) {
__sync_synchronize();
a->val_dont_use = v;
__asm__ __volatile__("" ::: "memory");
} else { // seq_cst
__sync_synchronize();
a->val_dont_use = v;
__sync_synchronize();
}
} else {
// 64-bit store on 32-bit platform.
// Gross, but simple and reliable.
typename T::Type cmp = a->val_dont_use;
typename T::Type cur;
for (;;) {
cur = __sync_val_compare_and_swap(&a->val_dont_use, cmp, v);
if (cmp == v)
break;
cmp = cur;
}
}
}
} // namespace __sanitizer
#endif // #ifndef SANITIZER_ATOMIC_CLANG_OTHER_H
|
