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/* lock_guard.h -*-C++-*-
*
*************************************************************************
*
* @copyright
* Copyright (C) 2011-2013, Intel Corporation
* All rights reserved.
*
* @copyright
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* @copyright
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY
* WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
**************************************************************************
*
* Lock guard patterned after the std::lock_guard class template proposed in
* the C++ 0x draft standard.
*
* An object of type lock_guard controls the ownership of a mutex object
* within a scope. A lock_guard object maintains ownership of a mutex object
* throughout the lock_guard object's lifetime. The behavior of a program is
* undefined if the mutex referenced by pm does not exist for the entire
* lifetime of the lock_guard object.
*/
#ifndef LOCK_GUARD_H_INCLUDED
#define LOCK_GUARD_H_INCLUDED
#include <cilk/cilk.h>
namespace cilkscreen
{
template <class Mutex>
class lock_guard
{
public:
typedef Mutex mutex_type;
explicit lock_guard(mutex_type &m) : pm(m)
{
pm.lock();
locked = true;
}
~lock_guard()
{
locked = false;
pm.unlock();
}
private:
lock_guard(lock_guard const&);
lock_guard& operator=(lock_guard const&);
private:
// exposition only:
mutex_type ±
bool locked;
};
}
#endif // LOCK_GUARD_H_INCLUDED
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