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Side by Side Diff: mojo/public/cpp/utility/lib/thread_local.h

Issue 814543006: Move //mojo/{public, edk} underneath //third_party (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@master
Patch Set: Rebase Created 5 years, 11 months ago
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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
14 namespace mojo {
15 namespace internal {
16
17 // Helper functions that abstract the cross-platform APIs.
18 struct 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.
32 template <typename P>
33 class ThreadLocalPointer {
34 public:
35 ThreadLocalPointer() : slot_() {}
36
37 void Allocate() { ThreadLocalPlatform::AllocateSlot(&slot_); }
38
39 void Free() { ThreadLocalPlatform::FreeSlot(slot_); }
40
41 P* Get() {
42 return static_cast<P*>(ThreadLocalPlatform::GetValueFromSlot(slot_));
43 }
44
45 void Set(P* value) { ThreadLocalPlatform::SetValueInSlot(slot_, value); }
46
47 private:
48 ThreadLocalPlatform::SlotType slot_;
49 };
50
51 } // namespace internal
52 } // namespace mojo
53
54 #endif // MOJO_PUBLIC_CPP_UTILITY_LIB_THREAD_LOCAL_H_
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