1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/gfx/skia/trunk/src/ports/SkAtomics_android.h Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,61 @@
1.4 +/*
1.5 + * Copyright 2013 Google Inc.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license that can be
1.8 + * found in the LICENSE file.
1.9 + */
1.10 +
1.11 +#ifndef SkAtomics_android_DEFINED
1.12 +#define SkAtomics_android_DEFINED
1.13 +
1.14 +/** Android framework atomics. */
1.15 +
1.16 +#include <cutils/atomic.h>
1.17 +#include <stdint.h>
1.18 +
1.19 +static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) {
1.20 + return android_atomic_inc(addr);
1.21 +}
1.22 +
1.23 +static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
1.24 + return android_atomic_add(inc, addr);
1.25 +}
1.26 +
1.27 +static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) {
1.28 + return android_atomic_dec(addr);
1.29 +}
1.30 +
1.31 +static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() {
1.32 + //HACK: Android is actually using full memory barriers.
1.33 + // Should this change, uncomment below.
1.34 + //int dummy;
1.35 + //android_atomic_acquire_store(0, &dummy);
1.36 +}
1.37 +
1.38 +static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) {
1.39 + while (true) {
1.40 + int32_t value = *addr;
1.41 + if (value == 0) {
1.42 + return 0;
1.43 + }
1.44 + if (0 == android_atomic_release_cas(value, value + 1, addr)) {
1.45 + return value;
1.46 + }
1.47 + }
1.48 +}
1.49 +
1.50 +static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr,
1.51 + int32_t before,
1.52 + int32_t after) {
1.53 + // android_atomic_release_cas returns 0 for success (if *addr == before and it wrote after).
1.54 + return android_atomic_release_cas(before, after, addr) == 0;
1.55 +}
1.56 +
1.57 +static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() {
1.58 + //HACK: Android is actually using full memory barriers.
1.59 + // Should this change, uncomment below.
1.60 + //int dummy;
1.61 + //android_atomic_acquire_store(0, &dummy);
1.62 +}
1.63 +
1.64 +#endif
