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| 1 /* | 1 /* |
| 2 * Copyright (C) 2011 Google Inc. All rights reserved. | 2 * Copyright (C) 2011 Google Inc. All rights reserved. |
| 3 * | 3 * |
| 4 * Redistribution and use in source and binary forms, with or without | 4 * Redistribution and use in source and binary forms, with or without |
| 5 * modification, are permitted provided that the following conditions are | 5 * modification, are permitted provided that the following conditions are |
| 6 * met: | 6 * met: |
| 7 * | 7 * |
| 8 * * Redistributions of source code must retain the above copyright | 8 * * Redistributions of source code must retain the above copyright |
| 9 * notice, this list of conditions and the following disclaimer. | 9 * notice, this list of conditions and the following disclaimer. |
| 10 * * Redistributions in binary form must reproduce the above | 10 * * Redistributions in binary form must reproduce the above |
| (...skipping 21 matching lines...) Expand all Loading... |
| 32 #define ThreadRestrictionVerifier_h | 32 #define ThreadRestrictionVerifier_h |
| 33 | 33 |
| 34 #include "wtf/Assertions.h" | 34 #include "wtf/Assertions.h" |
| 35 | 35 |
| 36 #if ENABLE(ASSERT) | 36 #if ENABLE(ASSERT) |
| 37 | 37 |
| 38 #include "wtf/Threading.h" | 38 #include "wtf/Threading.h" |
| 39 | 39 |
| 40 namespace WTF { | 40 namespace WTF { |
| 41 | 41 |
| 42 // Verifies that a class is used in a way that respects its lack of thread-safet
y. | 42 // Verifies that a class is used in a way that respects its lack of |
| 43 // The default mode is to verify that the object will only be used on a single t
hread. The | 43 // thread-safety. The default mode is to verify that the object will only be |
| 44 // thread gets captured when setShared(true) is called. | 44 // used on a single thread. The thread gets captured when setShared(true) is |
| 45 // The mode may be changed by calling useMutexMode (or turnOffVerification). | 45 // called. The mode may be changed by calling useMutexMode (or |
| 46 // turnOffVerification). |
| 46 class ThreadRestrictionVerifier { | 47 class ThreadRestrictionVerifier { |
| 47 public: | 48 public: |
| 48 ThreadRestrictionVerifier() : m_shared(false), m_owningThread(0) {} | 49 ThreadRestrictionVerifier() : m_shared(false), m_owningThread(0) {} |
| 49 | 50 |
| 50 void checkSafeToUse() const { | 51 void checkSafeToUse() const { |
| 51 // If this assert fires, it either indicates a thread safety issue or | 52 // If this assert fires, it either indicates a thread safety issue or |
| 52 // that the verification needs to change. | 53 // that the verification needs to change. |
| 53 ASSERT_WITH_SECURITY_IMPLICATION(isSafeToUse()); | 54 ASSERT_WITH_SECURITY_IMPLICATION(isSafeToUse()); |
| 54 } | 55 } |
| 55 | 56 |
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| 81 private: | 82 private: |
| 82 // Indicates that the object may (or may not) be owned by more than one place. | 83 // Indicates that the object may (or may not) be owned by more than one place. |
| 83 void setShared(bool shared) { | 84 void setShared(bool shared) { |
| 84 bool previouslyShared = m_shared; | 85 bool previouslyShared = m_shared; |
| 85 m_shared = shared; | 86 m_shared = shared; |
| 86 | 87 |
| 87 if (!m_shared) | 88 if (!m_shared) |
| 88 return; | 89 return; |
| 89 | 90 |
| 90 ASSERT_UNUSED(previouslyShared, shared != previouslyShared); | 91 ASSERT_UNUSED(previouslyShared, shared != previouslyShared); |
| 91 // Capture the current thread to verify that subsequent ref/deref happen on
this thread. | 92 // Capture the current thread to verify that subsequent ref/deref happen on |
| 93 // this thread. |
| 92 m_owningThread = currentThread(); | 94 m_owningThread = currentThread(); |
| 93 } | 95 } |
| 94 | 96 |
| 95 // Is it OK to use the object at this moment on the current thread? | 97 // Is it OK to use the object at this moment on the current thread? |
| 96 bool isSafeToUse() const { | 98 bool isSafeToUse() const { |
| 97 if (!m_shared) | 99 if (!m_shared) |
| 98 return true; | 100 return true; |
| 99 | 101 |
| 100 return m_owningThread == currentThread(); | 102 return m_owningThread == currentThread(); |
| 101 } | 103 } |
| 102 | 104 |
| 103 bool m_shared; | 105 bool m_shared; |
| 104 | 106 |
| 105 ThreadIdentifier m_owningThread; | 107 ThreadIdentifier m_owningThread; |
| 106 }; | 108 }; |
| 107 | 109 |
| 108 } // namespace WTF | 110 } // namespace WTF |
| 109 | 111 |
| 110 #endif // ENABLE(ASSERT) | 112 #endif // ENABLE(ASSERT) |
| 111 #endif // ThreadRestrictionVerifier_h | 113 #endif // ThreadRestrictionVerifier_h |
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