Mojo: re-org public/utility and public/environment

mojo/public/utility/lib/thread_local.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "mojo/public/utility/thread_local.h"
+#ifndef MOJO_PUBLIC_UTILITY_LIB_THREAD_LOCAL_H_
+#define MOJO_PUBLIC_UTILITY_LIB_THREAD_LOCAL_H_
 
-#include <assert.h>
+#ifndef _WIN32
 #include <pthread.h>
+#endif
+
+#include "mojo/public/system/macros.h"
 
 namespace mojo {
 namespace internal {
 
-// static
-void ThreadLocalPlatform::AllocateSlot(SlotType* slot) {
-  if (pthread_key_create(slot, NULL) != 0) {
-    assert(false);
+// Helper functions that abstract the cross-platform APIs.
+struct ThreadLocalPlatform {
+#ifdef _WIN32
+  typedef unsigned long SlotType;
+#else
+  typedef pthread_key_t SlotType;
+#endif
+
+  static void AllocateSlot(SlotType* slot);
+  static void FreeSlot(SlotType slot);
+  static void* GetValueFromSlot(SlotType slot);
+  static void SetValueInSlot(SlotType slot, void* value);
+};
+
+// This class is intended to be statically allocated.
+template <typename P>
+class ThreadLocalPointer {
+ public:
+  ThreadLocalPointer() : slot_() {
   }
-}
 
-// static
-void ThreadLocalPlatform::FreeSlot(SlotType slot) {
-  if (pthread_key_delete(slot) != 0) {
-    assert(false);
+  void Allocate() {
+    ThreadLocalPlatform::AllocateSlot(&slot_);
   }
-}
 
-// static
-void* ThreadLocalPlatform::GetValueFromSlot(SlotType slot) {
-  return pthread_getspecific(slot);
-}
+  void Free() {
+    ThreadLocalPlatform::FreeSlot(slot_);
+  }
 
-// static
-void ThreadLocalPlatform::SetValueInSlot(SlotType slot, void* value) {
-  if (pthread_setspecific(slot, value) != 0) {
-    assert(false);
+  P* Get() {
+    return static_cast<P*>(ThreadLocalPlatform::GetValueFromSlot(slot_));
   }
-}
+
+  void Set(P* value) {
+    ThreadLocalPlatform::SetValueInSlot(slot_, value);
+  }
+
+ private:
+  ThreadLocalPlatform::SlotType slot_;
+};
 
 }  // namespace internal
 }  // namespace mojo
+
+#endif  // MOJO_PUBLIC_UTILITY_LIB_THREAD_LOCAL_H_