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1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef BASE_SYNCHRONIZATION_LOCK_IMPL_H_ | 5 #ifndef BASE_SYNCHRONIZATION_LOCK_IMPL_H_ |
6 #define BASE_SYNCHRONIZATION_LOCK_IMPL_H_ | 6 #define BASE_SYNCHRONIZATION_LOCK_IMPL_H_ |
7 | 7 |
8 #include "base/base_export.h" | 8 #include "base/base_export.h" |
9 #include "base/macros.h" | 9 #include "base/macros.h" |
10 #include "build/build_config.h" | 10 #include "build/build_config.h" |
11 | 11 |
12 #if defined(OS_WIN) | 12 #if defined(OS_WIN) |
13 #include <windows.h> | 13 #include <windows.h> |
14 #elif defined(OS_POSIX) | 14 #elif defined(OS_POSIX) |
15 #include <pthread.h> | 15 #include <pthread.h> |
16 #endif | 16 #endif |
17 | 17 |
18 namespace base { | 18 namespace base { |
19 namespace internal { | 19 namespace internal { |
20 | 20 |
21 // This class implements the underlying platform-specific spin-lock mechanism | 21 // This class implements the underlying platform-specific spin-lock mechanism |
22 // used for the Lock class. Most users should not use LockImpl directly, but | 22 // used for the Lock class. Most users should not use LockImpl directly, but |
23 // should instead use Lock. | 23 // should instead use Lock. |
24 class BASE_EXPORT LockImpl { | 24 class BASE_EXPORT LockImpl { |
25 public: | 25 public: |
26 #if defined(OS_WIN) | 26 #if defined(OS_WIN) |
27 typedef CRITICAL_SECTION NativeHandle; | 27 using NativeHandle = SRWLOCK; |
28 #elif defined(OS_POSIX) | 28 #elif defined(OS_POSIX) |
29 typedef pthread_mutex_t NativeHandle; | 29 using NativeHandle = pthread_mutex_t; |
30 #endif | 30 #endif |
31 | 31 |
32 LockImpl(); | 32 LockImpl(); |
33 ~LockImpl(); | 33 ~LockImpl(); |
34 | 34 |
35 // If the lock is not held, take it and return true. If the lock is already | 35 // If the lock is not held, take it and return true. If the lock is already |
36 // held by something else, immediately return false. | 36 // held by something else, immediately return false. |
37 bool Try(); | 37 bool Try(); |
38 | 38 |
39 // Take the lock, blocking until it is available if necessary. | 39 // Take the lock, blocking until it is available if necessary. |
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51 private: | 51 private: |
52 NativeHandle native_handle_; | 52 NativeHandle native_handle_; |
53 | 53 |
54 DISALLOW_COPY_AND_ASSIGN(LockImpl); | 54 DISALLOW_COPY_AND_ASSIGN(LockImpl); |
55 }; | 55 }; |
56 | 56 |
57 } // namespace internal | 57 } // namespace internal |
58 } // namespace base | 58 } // namespace base |
59 | 59 |
60 #endif // BASE_SYNCHRONIZATION_LOCK_IMPL_H_ | 60 #endif // BASE_SYNCHRONIZATION_LOCK_IMPL_H_ |
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