Index: src/ports/SkAtomics_sync.h |
=================================================================== |
--- src/ports/SkAtomics_sync.h (revision 0) |
+++ src/ports/SkAtomics_sync.h (working copy) |
@@ -0,0 +1,49 @@ |
+/* |
+ * 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_sync_DEFINED |
+#define SkAtomics_sync_DEFINED |
+ |
+/** GCC/Clang __sync based atomics. */ |
+ |
+#include <stdint.h> |
+ |
+static inline __attribute__((always_inline)) int32_t sk_atomic_inc(int32_t* addr) { |
+ return __sync_fetch_and_add(addr, 1); |
+} |
+ |
+static inline __attribute__((always_inline)) int32_t sk_atomic_add(int32_t* addr, int32_t inc) { |
+ return __sync_fetch_and_add(addr, inc); |
+} |
+ |
+static inline __attribute__((always_inline)) int32_t sk_atomic_dec(int32_t* addr) { |
+ return __sync_fetch_and_add(addr, -1); |
+} |
+ |
+static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_dec() { } |
+ |
+static inline __attribute__((always_inline)) int32_t sk_atomic_conditional_inc(int32_t* addr) { |
+ int32_t value = *addr; |
+ |
+ while (true) { |
+ if (value == 0) { |
+ return 0; |
+ } |
+ |
+ int32_t before = __sync_val_compare_and_swap(addr, value, value + 1); |
+ |
+ if (before == value) { |
+ return value; |
+ } else { |
+ value = before; |
+ } |
+ } |
+} |
+ |
+static inline __attribute__((always_inline)) void sk_membar_acquire__after_atomic_conditional_inc() { } |
+ |
+#endif |