gfx/skia/trunk/src/ports/SkAtomics_sync.h@129ffea94266 (annotated)
gfx/skia/trunk/src/ports/SkAtomics_sync.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.
| michael@0 | 1 | /* |
| michael@0 | 2 | * Copyright 2013 Google Inc. |
| michael@0 | 3 | * |
| michael@0 | 4 | * Use of this source code is governed by a BSD-style license that can be |
| michael@0 | 5 | * found in the LICENSE file. |
| michael@0 | 6 | */ |
| michael@0 | 7 | |
| michael@0 | 8 | #ifndef SkAtomics_sync_DEFINED |
| michael@0 | 9 | #define SkAtomics_sync_DEFINED |
| michael@0 | 10 | |
| michael@0 | 11 | /** GCC/Clang __sync based atomics. */ |
| michael@0 | 12 | |
| michael@0 | 13 | #include <stdint.h> |
| michael@0 | 14 | |
| michael@0 | 15 | static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) { |
| michael@0 | 16 | return __sync_fetch_and_add(addr, 1); |
| michael@0 | 17 | } |
| michael@0 | 18 | |
| michael@0 | 19 | static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) { |
| michael@0 | 20 | return __sync_fetch_and_add(addr, inc); |
| michael@0 | 21 | } |
| michael@0 | 22 | |
| michael@0 | 23 | static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) { |
| michael@0 | 24 | return __sync_fetch_and_add(addr, -1); |
| michael@0 | 25 | } |
| michael@0 | 26 | |
| michael@0 | 27 | static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { } |
| michael@0 | 28 | |
| michael@0 | 29 | static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) { |
| michael@0 | 30 | int32_t value = *addr; |
| michael@0 | 31 | |
| michael@0 | 32 | while (true) { |
| michael@0 | 33 | if (value == 0) { |
| michael@0 | 34 | return 0; |
| michael@0 | 35 | } |
| michael@0 | 36 | |
| michael@0 | 37 | int32_t before = __sync_val_compare_and_swap(addr, value, value + 1); |
| michael@0 | 38 | |
| michael@0 | 39 | if (before == value) { |
| michael@0 | 40 | return value; |
| michael@0 | 41 | } else { |
| michael@0 | 42 | value = before; |
| michael@0 | 43 | } |
| michael@0 | 44 | } |
| michael@0 | 45 | } |
| michael@0 | 46 | |
| michael@0 | 47 | static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr, |
| michael@0 | 48 | int32_t before, |
| michael@0 | 49 | int32_t after) { |
| michael@0 | 50 | return __sync_bool_compare_and_swap(addr, before, after); |
| michael@0 | 51 | } |
| michael@0 | 52 | |
| michael@0 | 53 | static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { } |
| michael@0 | 54 | |
| michael@0 | 55 | #endif |
