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Unified Diff: src/ports/SkAtomics_sync.h

Issue 19808007: Split atomic and mutex implementations and make inlinable. (Closed) Base URL: http://skia.googlecode.com/svn/trunk/
Patch Set: Address dependency comments. Created 7 years ago
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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
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