Split atomic and mutex implementations and make inlinable.

src/ports/SkMutex_win.h

+/*
+ * 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 SkMutex_win_DEFINED
+#define SkMutex_win_DEFINED
+
+/** Windows CriticalSection based mutex. */
+
+#ifndef WIN32_LEAN_AND_MEAN
+#  define WIN32_LEAN_AND_MEAN
+#  define WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
+#endif
+#ifndef NOMINMAX
+#  define NOMINMAX
+#  define NOMINMAX_WAS_LOCALLY_DEFINED
+#endif
+#
+#include <windows.h>
+#
+#ifdef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
+#  undef WIN32_IS_MEAN_WAS_LOCALLY_DEFINED
+#  undef WIN32_LEAN_AND_MEAN
+#endif
+#ifdef NOMINMAX_WAS_LOCALLY_DEFINED
+#  undef NOMINMAX_WAS_LOCALLY_DEFINED
+#  undef NOMINMAX
+#endif
+
+// TODO: this exists because SK_DECLARE_STATIC_ONCE in methods is currently
+// relying on a compiler bug which allows the '=' to work.
+// All use of SK_DECLARE_STATIC_ONCE in methods is unsafe, and must be removed.
+// To find these cases, make SkMutex's copy and assignement private directly.
+class SkNoncopyableMutex {
+public:
+    SkNoncopyableMutex() { }
+
+private:
+    SkNoncopyableMutex(const SkNoncopyableMutex&);
+    SkNoncopyableMutex& operator=(const SkNoncopyableMutex&);
+};
+
+// On Windows, SkBaseMutex and SkMutex are the same thing,
+// we can't easily get rid of static initializers.
+class SkMutex : SkNoncopyableMutex {
+public:
+    SkMutex() {
+        InitializeCriticalSection(&fStorage);
+    }
+
+    ~SkMutex() {
+        DeleteCriticalSection(&fStorage);
+    }
+
+    void acquire() {
+        EnterCriticalSection(&fStorage);
+    }
+
+    void release() {
+        LeaveCriticalSection(&fStorage);
+    }
+
+private:
+    CRITICAL_SECTION fStorage;
+};
+
+typedef SkMutex SkBaseMutex;
+
+// Windows currently provides no documented means of POD initializing a CRITICAL_SECTION.
+#define SK_DECLARE_STATIC_MUTEX(name) static SkBaseMutex name
+#define SK_DECLARE_GLOBAL_MUTEX(name) SkBaseMutex name
+
+#endif