1// Copyright 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef MOJO_PUBLIC_CPP_UTILITY_LIB_THREAD_LOCAL_H_
6#define MOJO_PUBLIC_CPP_UTILITY_LIB_THREAD_LOCAL_H_
7
8#ifndef _WIN32
9#include <pthread.h>
10#endif
11
12#include "mojo/public/cpp/system/macros.h"
13
14namespace mojo {
15namespace internal {
16
17// Helper functions that abstract the cross-platform APIs.
18struct ThreadLocalPlatform {
19#ifdef _WIN32
20  typedef unsigned long SlotType;
21#else
22  typedef pthread_key_t SlotType;
23#endif
24
25  static void AllocateSlot(SlotType* slot);
26  static void FreeSlot(SlotType slot);
27  static void* GetValueFromSlot(SlotType slot);
28  static void SetValueInSlot(SlotType slot, void* value);
29};
30
31// This class is intended to be statically allocated.
32template <typename P>
33class ThreadLocalPointer {
34 public:
35  ThreadLocalPointer() : slot_() {
36  }
37
38  void Allocate() {
39    ThreadLocalPlatform::AllocateSlot(&slot_);
40  }
41
42  void Free() {
43    ThreadLocalPlatform::FreeSlot(slot_);
44  }
45
46  P* Get() {
47    return static_cast<P*>(ThreadLocalPlatform::GetValueFromSlot(slot_));
48  }
49
50  void Set(P* value) {
51    ThreadLocalPlatform::SetValueInSlot(slot_, value);
52  }
53
54 private:
55  ThreadLocalPlatform::SlotType slot_;
56};
57
58}  // namespace internal
59}  // namespace mojo
60
61#endif  // MOJO_PUBLIC_CPP_UTILITY_LIB_THREAD_LOCAL_H_
62