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105 lines
2.9 KiB
C++
105 lines
2.9 KiB
C++
// Vaca - Visual Application Components Abstraction
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// Copyright (c) 2005-2009 David Capello
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// 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
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// are 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 copyright
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// notice, this list of conditions and the following disclaimer in
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// the documentation and/or other materials provided with the
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// distribution.
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// * Neither the name of the author nor the names of its contributors
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// may be used to endorse or promote products derived from this
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// 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
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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// COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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// (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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// HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
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// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
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// OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef VACA_SCOPEDLOCK_H
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#define VACA_SCOPEDLOCK_H
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#include "Vaca/base.h"
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#include "Vaca/Mutex.h"
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#include "Vaca/NonCopyable.h"
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namespace Vaca {
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/**
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An object to safely lock and unlock mutexes.
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The constructor of ScopedLock locks the mutex, the destructor
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unlocks the mutex. In this way you can safely use ScopedLock
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inside a try/catch block without worrying about to the lock
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state of the mutex.
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For example:
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@code
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try {
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ScopedLock hold(mutex);
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throw Exception();
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}
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catch (...) {
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// the mutex is unlocked here
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}
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// if you don't throw a exception, the mutex is unlocked here too
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@endcode
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@see Mutex, ConditionVariable
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*/
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class ScopedLock : private NonCopyable
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{
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Mutex& m_mutex;
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// not defined
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ScopedLock();
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public:
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/**
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Creates the ScopedLock locking the specified mutex.
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@param mutex
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Mutex to be hold by the ScopedLock's life-time.
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*/
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ScopedLock(Mutex& mutex)
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: m_mutex(mutex)
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{
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m_mutex.lock();
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}
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/**
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Destroys the ScopedLock unlocking the held mutex.
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*/
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~ScopedLock()
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{
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m_mutex.unlock();
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}
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/**
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Returns which mutex is being held.
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*/
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Mutex& getMutex() const
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{
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return m_mutex;
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}
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};
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} // namespace Vaca
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#endif // VACA_SCOPEDLOCK_H
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