gfx/skia/trunk/src/ports/SkAtomics_win.h@129ffea94266
gfx/skia/trunk/src/ports/SkAtomics_win.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
8 #ifndef SkAtomics_win_DEFINED
9 #define SkAtomics_win_DEFINED
11 /** Windows Interlocked atomics. */
13 #include <intrin.h>
14 #include <stdint.h>
16 //MSDN says in order to declare an interlocked function for use as an
17 //intrinsic, include intrin.h and put the function in a #pragma intrinsic
18 //directive.
19 //The pragma appears to be unnecessary, but doesn't hurt.
20 #pragma intrinsic(_InterlockedIncrement, _InterlockedExchangeAdd, _InterlockedDecrement)
21 #pragma intrinsic(_InterlockedCompareExchange)
23 static inline int32_t sk_atomic_inc(int32_t* addr) {
24 // InterlockedIncrement returns the new value, we want to return the old.
25 return _InterlockedIncrement(reinterpret_cast<long*>(addr)) - 1;
26 }
28 static inline int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
29 return _InterlockedExchangeAdd(reinterpret_cast<long*>(addr), static_cast<long>(inc));
30 }
32 static inline int32_t sk_atomic_dec(int32_t* addr) {
33 // InterlockedDecrement returns the new value, we want to return the old.
34 return _InterlockedDecrement(reinterpret_cast<long*>(addr)) + 1;
35 }
37 static inline void sk_membar_acquire__after_atomic_dec() { }
39 static inline int32_t sk_atomic_conditional_inc(int32_t* addr) {
40 long value = *addr;
41 while (true) {
42 if (value == 0) {
43 return 0;
44 }
46 long before = _InterlockedCompareExchange(reinterpret_cast<long*>(addr), value + 1, value);
48 if (before == value) {
49 return value;
50 } else {
51 value = before;
52 }
53 }
54 }
56 static inline bool sk_atomic_cas(int32_t* addr, int32_t before, int32_t after) {
57 return _InterlockedCompareExchange(reinterpret_cast<long*>(addr), after, before) == before;
58 }
60 static inline void sk_membar_acquire__after_atomic_conditional_inc() { }
62 #endif
