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| 1 /* |
| 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 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 |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #include "webrtc/base/thread_annotations.h" |
| 12 #include "webrtc/test/gtest.h" |
| 13 |
| 14 namespace { |
| 15 |
| 16 class LOCKABLE Lock { |
| 17 public: |
| 18 void EnterWrite() const EXCLUSIVE_LOCK_FUNCTION() {} |
| 19 void EnterRead() const SHARED_LOCK_FUNCTION() {} |
| 20 bool TryEnterWrite() const EXCLUSIVE_TRYLOCK_FUNCTION(true) { return true; } |
| 21 bool TryEnterRead() const SHARED_TRYLOCK_FUNCTION(true) { return true; } |
| 22 void Leave() const UNLOCK_FUNCTION() {} |
| 23 }; |
| 24 |
| 25 class SCOPED_LOCKABLE ScopeLock { |
| 26 public: |
| 27 explicit ScopeLock(const Lock& lock) EXCLUSIVE_LOCK_FUNCTION(lock) {} |
| 28 ~ScopeLock() UNLOCK_FUNCTION() {} |
| 29 }; |
| 30 |
| 31 class ThreadSafe { |
| 32 public: |
| 33 ThreadSafe() { |
| 34 pt_protected_by_lock_ = new int; |
| 35 pt_protected_by_anything_ = new int; |
| 36 } |
| 37 |
| 38 ~ThreadSafe() { |
| 39 delete pt_protected_by_lock_; |
| 40 delete pt_protected_by_anything_; |
| 41 } |
| 42 |
| 43 void LockInOrder() { |
| 44 anylock_.EnterWrite(); |
| 45 lock_.EnterWrite(); |
| 46 pt_lock_.EnterWrite(); |
| 47 |
| 48 pt_lock_.Leave(); |
| 49 lock_.Leave(); |
| 50 anylock_.Leave(); |
| 51 } |
| 52 |
| 53 void UnprotectedFunction() LOCKS_EXCLUDED(anylock_, lock_, pt_lock_) { |
| 54 // Can access unprotected Value. |
| 55 unprotected_ = 15; |
| 56 // Can access pointers themself, but not data they point to. |
| 57 int* tmp = pt_protected_by_lock_; |
| 58 pt_protected_by_lock_ = pt_protected_by_anything_; |
| 59 pt_protected_by_anything_ = tmp; |
| 60 } |
| 61 |
| 62 void ReadProtected() { |
| 63 lock_.EnterRead(); |
| 64 unprotected_ = protected_by_anything_; |
| 65 unprotected_ = protected_by_lock_; |
| 66 lock_.Leave(); |
| 67 |
| 68 if (pt_lock_.TryEnterRead()) { |
| 69 unprotected_ = *pt_protected_by_anything_; |
| 70 unprotected_ = *pt_protected_by_lock_; |
| 71 pt_lock_.Leave(); |
| 72 } |
| 73 |
| 74 anylock_.EnterRead(); |
| 75 unprotected_ = protected_by_anything_; |
| 76 unprotected_ = *pt_protected_by_anything_; |
| 77 anylock_.Leave(); |
| 78 } |
| 79 |
| 80 void WriteProtected() { |
| 81 lock_.EnterWrite(); |
| 82 protected_by_anything_ = unprotected_; |
| 83 protected_by_lock_ = unprotected_; |
| 84 lock_.Leave(); |
| 85 |
| 86 if (pt_lock_.TryEnterWrite()) { |
| 87 *pt_protected_by_anything_ = unprotected_; |
| 88 *pt_protected_by_lock_ = unprotected_; |
| 89 pt_lock_.Leave(); |
| 90 } |
| 91 |
| 92 anylock_.EnterWrite(); |
| 93 protected_by_anything_ = unprotected_; |
| 94 *pt_protected_by_anything_ = unprotected_; |
| 95 anylock_.Leave(); |
| 96 } |
| 97 |
| 98 void CallReadProtectedFunction() { |
| 99 lock_.EnterRead(); |
| 100 pt_lock_.EnterRead(); |
| 101 ReadProtectedFunction(); |
| 102 pt_lock_.Leave(); |
| 103 lock_.Leave(); |
| 104 } |
| 105 |
| 106 void CallWriteProtectedFunction() { |
| 107 ScopeLock scope_lock(GetLock()); |
| 108 ScopeLock pt_scope_lock(pt_lock_); |
| 109 WriteProtectedFunction(); |
| 110 } |
| 111 |
| 112 private: |
| 113 void ReadProtectedFunction() SHARED_LOCKS_REQUIRED(lock_, pt_lock_) { |
| 114 unprotected_ = protected_by_lock_; |
| 115 unprotected_ = *pt_protected_by_lock_; |
| 116 } |
| 117 |
| 118 void WriteProtectedFunction() EXCLUSIVE_LOCKS_REQUIRED(lock_, pt_lock_) { |
| 119 int x = protected_by_lock_; |
| 120 *pt_protected_by_lock_ = x; |
| 121 protected_by_lock_ = unprotected_; |
| 122 } |
| 123 |
| 124 const Lock& GetLock() LOCK_RETURNED(lock_) { return lock_; } |
| 125 |
| 126 Lock anylock_ ACQUIRED_BEFORE(lock_); |
| 127 Lock lock_; |
| 128 Lock pt_lock_ ACQUIRED_AFTER(lock_); |
| 129 |
| 130 int unprotected_ = 0; |
| 131 |
| 132 int protected_by_lock_ GUARDED_BY(lock_) = 0; |
| 133 int protected_by_anything_ GUARDED_VAR = 0; |
| 134 |
| 135 int* pt_protected_by_lock_ PT_GUARDED_BY(pt_lock_); |
| 136 int* pt_protected_by_anything_ PT_GUARDED_VAR; |
| 137 }; |
| 138 |
| 139 } // namespace |
| 140 |
| 141 TEST(ThreadAnnotationsTest, Test) { |
| 142 // This test ensure thread annotations doesn't break compilation. |
| 143 // Thus no run-time expectations. |
| 144 ThreadSafe t; |
| 145 t.LockInOrder(); |
| 146 t.UnprotectedFunction(); |
| 147 t.ReadProtected(); |
| 148 t.WriteProtected(); |
| 149 t.CallReadProtectedFunction(); |
| 150 t.CallWriteProtectedFunction(); |
| 151 } |
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