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88 lines
3.0 KiB
C++
88 lines
3.0 KiB
C++
/*
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* Copyright (C) 2011 Google Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are
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* met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following disclaimer
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* in the documentation and/or other materials provided with the
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* distribution.
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* * Neither the name of Google Inc. nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SKY_ENGINE_WTF_THREADRESTRICTIONVERIFIER_H_
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#define SKY_ENGINE_WTF_THREADRESTRICTIONVERIFIER_H_
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#include "sky/engine/wtf/Assertions.h"
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#if ENABLE(ASSERT)
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#include "sky/engine/wtf/Threading.h"
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namespace WTF {
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// Verifies that a class is used in a way that respects its lack of thread-safety.
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// The default mode is to verify that the object will only be used on a single thread. The
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// thread gets captured when setShared(true) is called.
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// The mode may be changed by calling useMutexMode (or turnOffVerification).
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class ThreadRestrictionVerifier {
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public:
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ThreadRestrictionVerifier()
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: m_shared(false)
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, m_owningThread(0)
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{
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}
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// Indicates that the object may (or may not) be owned by more than one place.
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void setShared(bool shared)
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{
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bool previouslyShared = m_shared;
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m_shared = shared;
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if (!m_shared)
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return;
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ASSERT(shared != previouslyShared);
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// Capture the current thread to verify that subsequent ref/deref happen on this thread.
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m_owningThread = currentThread();
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}
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// Is it OK to use the object at this moment on the current thread?
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bool isSafeToUse() const
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{
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if (!m_shared)
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return true;
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return m_owningThread == currentThread();
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}
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private:
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bool m_shared;
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// Used by SingleThreadVerificationMode
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ThreadIdentifier m_owningThread;
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};
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}
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#endif // ENABLE(ASSERT)
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#endif // SKY_ENGINE_WTF_THREADRESTRICTIONVERIFIER_H_
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