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1 /* | 1 /* |
2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. | 2 * Copyright 2004 The WebRTC Project Authors. All rights reserved. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license | 4 * Use of this source code is governed by a BSD-style license |
5 * that can be found in the LICENSE file in the root of the source | 5 * that can be found in the LICENSE file in the root of the source |
6 * tree. An additional intellectual property rights grant can be found | 6 * tree. An additional intellectual property rights grant can be found |
7 * in the file PATENTS. All contributing project authors may | 7 * in the file PATENTS. All contributing project authors may |
8 * be found in the AUTHORS file in the root of the source tree. | 8 * be found in the AUTHORS file in the root of the source tree. |
9 */ | 9 */ |
10 | 10 |
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45 #define CS_DEBUG_CODE(x) x | 45 #define CS_DEBUG_CODE(x) x |
46 #else // !CS_DEBUG_CHECKS | 46 #else // !CS_DEBUG_CHECKS |
47 #define CS_DEBUG_CODE(x) | 47 #define CS_DEBUG_CODE(x) |
48 #endif // !CS_DEBUG_CHECKS | 48 #endif // !CS_DEBUG_CHECKS |
49 | 49 |
50 namespace rtc { | 50 namespace rtc { |
51 | 51 |
52 // Locking methods (Enter, TryEnter, Leave)are const to permit protecting | 52 // Locking methods (Enter, TryEnter, Leave)are const to permit protecting |
53 // members inside a const context without requiring mutable CriticalSections | 53 // members inside a const context without requiring mutable CriticalSections |
54 // everywhere. | 54 // everywhere. |
55 class RTC_LOCKABLE CriticalSection { | 55 class LOCKABLE CriticalSection { |
56 public: | 56 public: |
57 CriticalSection(); | 57 CriticalSection(); |
58 ~CriticalSection(); | 58 ~CriticalSection(); |
59 | 59 |
60 void Enter() const RTC_EXCLUSIVE_LOCK_FUNCTION(); | 60 void Enter() const EXCLUSIVE_LOCK_FUNCTION(); |
61 bool TryEnter() const RTC_EXCLUSIVE_TRYLOCK_FUNCTION(true); | 61 bool TryEnter() const EXCLUSIVE_TRYLOCK_FUNCTION(true); |
62 void Leave() const RTC_UNLOCK_FUNCTION(); | 62 void Leave() const UNLOCK_FUNCTION(); |
63 | 63 |
64 private: | 64 private: |
65 // Use only for RTC_DCHECKing. | 65 // Use only for RTC_DCHECKing. |
66 bool CurrentThreadIsOwner() const; | 66 bool CurrentThreadIsOwner() const; |
67 | 67 |
68 #if defined(WEBRTC_WIN) | 68 #if defined(WEBRTC_WIN) |
69 mutable CRITICAL_SECTION crit_; | 69 mutable CRITICAL_SECTION crit_; |
70 #elif defined(WEBRTC_POSIX) | 70 #elif defined(WEBRTC_POSIX) |
71 # if defined(WEBRTC_MAC) && !USE_NATIVE_MUTEX_ON_MAC | 71 # if defined(WEBRTC_MAC) && !USE_NATIVE_MUTEX_ON_MAC |
72 // Number of times the lock has been locked + number of threads waiting. | 72 // Number of times the lock has been locked + number of threads waiting. |
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84 mutable pthread_mutex_t mutex_; | 84 mutable pthread_mutex_t mutex_; |
85 # endif | 85 # endif |
86 mutable PlatformThreadRef thread_; // Only used by RTC_DCHECKs. | 86 mutable PlatformThreadRef thread_; // Only used by RTC_DCHECKs. |
87 mutable int recursion_count_; // Only used by RTC_DCHECKs. | 87 mutable int recursion_count_; // Only used by RTC_DCHECKs. |
88 #else // !defined(WEBRTC_WIN) && !defined(WEBRTC_POSIX) | 88 #else // !defined(WEBRTC_WIN) && !defined(WEBRTC_POSIX) |
89 # error Unsupported platform. | 89 # error Unsupported platform. |
90 #endif | 90 #endif |
91 }; | 91 }; |
92 | 92 |
93 // CritScope, for serializing execution through a scope. | 93 // CritScope, for serializing execution through a scope. |
94 class RTC_SCOPED_LOCKABLE CritScope { | 94 class SCOPED_LOCKABLE CritScope { |
95 public: | 95 public: |
96 explicit CritScope(const CriticalSection* cs) RTC_EXCLUSIVE_LOCK_FUNCTION(cs); | 96 explicit CritScope(const CriticalSection* cs) EXCLUSIVE_LOCK_FUNCTION(cs); |
97 ~CritScope() RTC_UNLOCK_FUNCTION(); | 97 ~CritScope() UNLOCK_FUNCTION(); |
98 | |
99 private: | 98 private: |
100 const CriticalSection* const cs_; | 99 const CriticalSection* const cs_; |
101 RTC_DISALLOW_COPY_AND_ASSIGN(CritScope); | 100 RTC_DISALLOW_COPY_AND_ASSIGN(CritScope); |
102 }; | 101 }; |
103 | 102 |
104 // Tries to lock a critical section on construction via | 103 // Tries to lock a critical section on construction via |
105 // CriticalSection::TryEnter, and unlocks on destruction if the | 104 // CriticalSection::TryEnter, and unlocks on destruction if the |
106 // lock was taken. Never blocks. | 105 // lock was taken. Never blocks. |
107 // | 106 // |
108 // IMPORTANT: Unlike CritScope, the lock may not be owned by this thread in | 107 // IMPORTANT: Unlike CritScope, the lock may not be owned by this thread in |
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121 #endif | 120 #endif |
122 private: | 121 private: |
123 const CriticalSection* const cs_; | 122 const CriticalSection* const cs_; |
124 const bool locked_; | 123 const bool locked_; |
125 mutable bool lock_was_called_; // Only used by RTC_DCHECKs. | 124 mutable bool lock_was_called_; // Only used by RTC_DCHECKs. |
126 RTC_DISALLOW_COPY_AND_ASSIGN(TryCritScope); | 125 RTC_DISALLOW_COPY_AND_ASSIGN(TryCritScope); |
127 }; | 126 }; |
128 | 127 |
129 // A POD lock used to protect global variables. Do NOT use for other purposes. | 128 // A POD lock used to protect global variables. Do NOT use for other purposes. |
130 // No custom constructor or private data member should be added. | 129 // No custom constructor or private data member should be added. |
131 class RTC_LOCKABLE GlobalLockPod { | 130 class LOCKABLE GlobalLockPod { |
132 public: | 131 public: |
133 void Lock() RTC_EXCLUSIVE_LOCK_FUNCTION(); | 132 void Lock() EXCLUSIVE_LOCK_FUNCTION(); |
134 | 133 |
135 void Unlock() RTC_UNLOCK_FUNCTION(); | 134 void Unlock() UNLOCK_FUNCTION(); |
136 | 135 |
137 volatile int lock_acquired; | 136 volatile int lock_acquired; |
138 }; | 137 }; |
139 | 138 |
140 class GlobalLock : public GlobalLockPod { | 139 class GlobalLock : public GlobalLockPod { |
141 public: | 140 public: |
142 GlobalLock(); | 141 GlobalLock(); |
143 }; | 142 }; |
144 | 143 |
145 // GlobalLockScope, for serializing execution through a scope. | 144 // GlobalLockScope, for serializing execution through a scope. |
146 class RTC_SCOPED_LOCKABLE GlobalLockScope { | 145 class SCOPED_LOCKABLE GlobalLockScope { |
147 public: | 146 public: |
148 explicit GlobalLockScope(GlobalLockPod* lock) | 147 explicit GlobalLockScope(GlobalLockPod* lock) EXCLUSIVE_LOCK_FUNCTION(lock); |
149 RTC_EXCLUSIVE_LOCK_FUNCTION(lock); | 148 ~GlobalLockScope() UNLOCK_FUNCTION(); |
150 ~GlobalLockScope() RTC_UNLOCK_FUNCTION(); | |
151 | |
152 private: | 149 private: |
153 GlobalLockPod* const lock_; | 150 GlobalLockPod* const lock_; |
154 RTC_DISALLOW_COPY_AND_ASSIGN(GlobalLockScope); | 151 RTC_DISALLOW_COPY_AND_ASSIGN(GlobalLockScope); |
155 }; | 152 }; |
156 | 153 |
157 } // namespace rtc | 154 } // namespace rtc |
158 | 155 |
159 #endif // WEBRTC_RTC_BASE_CRITICALSECTION_H_ | 156 #endif // WEBRTC_RTC_BASE_CRITICALSECTION_H_ |
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