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 */ 7 8#ifndef SkAtomics_sync_DEFINED 9#define SkAtomics_sync_DEFINED 10 11/** GCC/Clang __sync based atomics. */ 12 13#include <stdint.h> 14 15static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) { 16 return __sync_fetch_and_add(addr, 1); 17} 18 19static inline __attribute__((always_inline)) int64_t sk_atomic_inc(int64_t* addr) { 20#if defined(__mips__) && !defined(__LP64__) && !defined(__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8) 21 /** Some versions of the GCC 32-bit MIPS toolchains (e.g. 4.8) for android are missing 22 * support for the __sync* functions that operate on 64-bit values. The workaround 23 * is to use __atomic* functions until we can move everything to <stdatomic.h>. 24 */ 25 return __atomic_fetch_add(addr, 1, __ATOMIC_SEQ_CST); 26#else 27 return __sync_fetch_and_add(addr, 1); 28#endif 29} 30 31static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) { 32 return __sync_fetch_and_add(addr, inc); 33} 34 35static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) { 36 return __sync_fetch_and_add(addr, -1); 37} 38 39static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { } 40 41static inline __attribute__((always_inline)) bool sk_atomic_cas(int32_t* addr, 42 int32_t before, 43 int32_t after) { 44 return __sync_bool_compare_and_swap(addr, before, after); 45} 46 47static inline __attribute__((always_inline)) void* sk_atomic_cas(void** addr, 48 void* before, 49 void* after) { 50 return __sync_val_compare_and_swap(addr, before, after); 51} 52 53static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { } 54 55#endif 56