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
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#ifndef SkAtomics_win_DEFINED
#define SkAtomics_win_DEFINED
/** Windows Interlocked atomics. */
#include <intrin.h>
#include <stdint.h>
//MSDN says in order to declare an interlocked function for use as an
//intrinsic, include intrin.h and put the function in a #pragma intrinsic
//directive.
//The pragma appears to be unnecessary, but doesn't hurt.
#pragma intrinsic(_InterlockedIncrement, _InterlockedExchangeAdd, _InterlockedDecrement)
#pragma intrinsic(_InterlockedCompareExchange)
static inline int32_t sk_atomic_inc(int32_t* addr) {
// InterlockedIncrement returns the new value, we want to return the old.
return _InterlockedIncrement(reinterpret_cast<long*>(addr)) - 1;
}
static inline int64_t sk_atomic_inc(int64_t* addr) {
// InterlockedIncrement returns the new value, we want to return the old.
return InterlockedIncrement64(addr) - 1;
}
static inline int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
return _InterlockedExchangeAdd(reinterpret_cast<long*>(addr), static_cast<long>(inc));
}
static inline int32_t sk_atomic_dec(int32_t* addr) {
// InterlockedDecrement returns the new value, we want to return the old.
return _InterlockedDecrement(reinterpret_cast<long*>(addr)) + 1;
}
static inline void sk_membar_acquire__after_atomic_dec() { }
static inline bool sk_atomic_cas(int32_t* addr, int32_t before, int32_t after) {
return _InterlockedCompareExchange(reinterpret_cast<long*>(addr), after, before) == before;
}
static inline void* sk_atomic_cas(void** addr, void* before, void* after) {
return InterlockedCompareExchangePointer(addr, after, before);
}
static inline void sk_membar_acquire__after_atomic_conditional_inc() { }
#endif
|
