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Unified Diff: src/ports/SkAtomics_win.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_win.h
===================================================================
--- src/ports/SkAtomics_win.h (revision 0)
+++ src/ports/SkAtomics_win.h (working copy)
@@ -0,0 +1,58 @@
+/*
+ * 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_win_DEFINED
+#define SkAtomics_win_DEFINED
+
+/** Windows Interlocked atomics. */
+
+#include <intrin.h>
+#include <stdint.h>
+
+//MSDN says in order to declare an interlocked function for use as an
+//intrinsic, include intrin.h and put the function in a #pragma intrinsic
+//directive.
+//The pragma appears to be unnecessary, but doesn't hurt.
+#pragma intrinsic(_InterlockedIncrement, _InterlockedExchangeAdd, _InterlockedDecrement)
+#pragma intrinsic(_InterlockedCompareExchange)
+
+static inline int32_t sk_atomic_inc(int32_t* addr) {
+ // InterlockedIncrement returns the new value, we want to return the old.
+ return _InterlockedIncrement(reinterpret_cast<long*>(addr)) - 1;
+}
+
+static inline int32_t sk_atomic_add(int32_t* addr, int32_t inc) {
+ return _InterlockedExchangeAdd(reinterpret_cast<long*>(addr), static_cast<long>(inc));
+}
+
+static inline int32_t sk_atomic_dec(int32_t* addr) {
+ // InterlockedDecrement returns the new value, we want to return the old.
+ return _InterlockedDecrement(reinterpret_cast<long*>(addr)) + 1;
+}
+
+static inline void sk_membar_acquire__after_atomic_dec() { }
+
+static inline int32_t sk_atomic_conditional_inc(int32_t* addr) {
+ long value = *addr;
+ while (true) {
+ if (value == 0) {
+ return 0;
+ }
+
+ long before = _InterlockedCompareExchange(reinterpret_cast<long*>(addr), value + 1, value);
+
+ if (before == value) {
+ return value;
+ } else {
+ value = before;
+ }
+ }
+}
+
+static inline void sk_membar_acquire__after_atomic_conditional_inc() { }
+
+#endif
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