#ifndef _Lock_hpp_

#define _Lock_hpp_

//@HEADER

// ************************************************************************

//

// miniFE: simple finite-element assembly and linear-solve

// Copyright (2006) Sandia Corporation

//

// Under terms of Contract DE-AC04-94AL85000, there is a non-exclusive

// license for use of this work by or on behalf of the U.S. Government.

//

// This library is free software; you can redistribute it and/or modify

// it under the terms of the GNU Lesser General Public License as

// published by the Free Software Foundation; either version 2.1 of the

// License, or (at your option) any later version.

//

// This library is distributed in the hope that it will be useful, but

// WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU

// Lesser General Public License for more details.

//

// You should have received a copy of the GNU Lesser General Public

// License along with this library; if not, write to the Free Software

// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307

// USA

// Questions? Contact Michael A. Heroux (maherou@sandia.gov)

//

// ************************************************************************

//@HEADER

#ifdef MINIFE_HAVE_TBB

#include <iostream>

#include <tbb/atomic.h>

namespace miniFE {

static tbb::atomic<size_t> miniFE_num_matrix_conflicts;

static tbb::atomic<size_t> miniFE_num_vector_conflicts;

//We have two lock classes, LockM and LockV. The only reason for

//this is so that they can separately track the number of conflicts

//for matrix accesses versus vector accesses (by incrementing the

//above counters).

//The LockingMatrix class uses LockM, LockingVector uses LockV.

template<typename T>

class LockM {

public:

// Constructors/destructors

LockM(tbb::atomic<T>& row)

: locked_row_(row)

{

if (++locked_row_ != 1) {

unsigned counter = 0;

while(locked_row_ != 1) {

++counter;

}

++miniFE_num_matrix_conflicts;

}

}

~LockM()

{ --locked_row_; }

private:

tbb::atomic<T>& locked_row_;

LockM(const LockM&);

LockM& operator=(const LockM&);

};

template<typename T>

class LockV {

public:

// Constructors/destructors

LockV(tbb::atomic<T>& row)

: locked_row_(row)

{

if (++locked_row_ != 1) {

unsigned counter = 0;

while(locked_row_ != 1) {

++counter;

}

++miniFE_num_vector_conflicts;

}

}

~LockV()

{ --locked_row_; }

private:

tbb::atomic<T>& locked_row_;

LockV(const LockV&);

LockV& operator=(const LockV&);

};

}//namespace miniFE

#else

#error "ERROR, this file shouldn't be compiled if MINIFE_HAVE_TBB isn't defined."

#endif

#endif