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/* Copyright 2013 IST Austria
Contributed by: Ulrich Bauer, Michael Kerber, Jan Reininghaus
This file is part of PHAT.
PHAT 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 3 of the License, or
(at your option) any later version.
PHAT 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 PHAT. If not, see <http://www.gnu.org/licenses/>. */
#pragma once
#include <phat/helpers/misc.h>
// should ideally be equal to the cache line size of the CPU
#define PHAT_TLS_SPACING_FACTOR 64
// ThreadLocalStorage with some spacing to avoid "false sharing" (see wikipedia)
template< typename T >
class thread_local_storage
{
public:
thread_local_storage() : per_thread_storage( omp_get_max_threads() * PHAT_TLS_SPACING_FACTOR ) {};
T& operator()() {
return per_thread_storage[ omp_get_thread_num() * PHAT_TLS_SPACING_FACTOR ];
}
const T& operator()() const {
return per_thread_storage[ omp_get_thread_num() * PHAT_TLS_SPACING_FACTOR ];
}
T& operator[]( int tid ) {
return per_thread_storage[ tid * PHAT_TLS_SPACING_FACTOR ];
}
const T& operator[]( int tid ) const {
return per_thread_storage[ tid * PHAT_TLS_SPACING_FACTOR ];
}
protected:
std::vector< T > per_thread_storage;
};
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