/usr/include/deal.II/lac/swappable_vector.templates.h is in libdeal.ii-dev 8.1.0-4.
This file is owned by root:root, with mode 0o644.
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// $Id: swappable_vector.templates.h 30036 2013-07-18 16:55:32Z maier $
//
// Copyright (C) 2000 - 2013 by the deal.II authors
//
// This file is part of the deal.II library.
//
// The deal.II library is free software; you can use it, 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.
// The full text of the license can be found in the file LICENSE at
// the top level of the deal.II distribution.
//
// ---------------------------------------------------------------------
#ifndef __deal2__swappable_vector_templates_h
#define __deal2__swappable_vector_templates_h
#include <deal.II/base/memory_consumption.h>
#include <deal.II/lac/swappable_vector.h>
#include <fstream>
DEAL_II_NAMESPACE_OPEN
template <typename number>
SwappableVector<number>::SwappableVector ()
:
data_is_preloaded (false)
{}
template <typename number>
SwappableVector<number>::SwappableVector (const SwappableVector<number> &v) :
Vector<number>(v),
filename (),
data_is_preloaded (false)
{
Assert (v.filename == "", ExcInvalidCopyOperation());
}
template <typename number>
SwappableVector<number>::~SwappableVector ()
{
// if the vector was stored in a
// file previously, and that has
// not been deleted in the
// meantime, then we kill that file
// first, before killing the vector
// itself
if (filename != "")
kill_file ();
}
template <typename number>
SwappableVector<number> &
SwappableVector<number>::operator= (const SwappableVector<number> &v)
{
// if necessary, first delete data
if (filename != "")
kill_file ();
// if in MT mode, block all other
// operations. if not in MT mode,
// this is a no-op
Threads::Mutex::ScopedLock lock(this->lock);
Vector<number>::operator = (v);
data_is_preloaded = false;
return *this;
}
template <typename number>
void SwappableVector<number>::swap_out (const std::string &name)
{
// if the vector was stored in
// another file previously, and
// that has not been deleted in the
// meantime, then we kill that file
// first
if (filename != "")
kill_file ();
filename = name;
Assert (this->size() != 0, ExcSizeZero());
// if in MT mode, block all other
// operations. if not in MT mode,
// this is a no-op
Threads::Mutex::ScopedLock lock(this->lock);
// check that we have not called
// @p alert without the respective
// @p reload function
Assert (data_is_preloaded == false, ExcInternalError());
std::ofstream tmp_out(filename.c_str());
this->block_write (tmp_out);
tmp_out.close ();
this->reinit (0);
}
template <typename number>
void SwappableVector<number>::reload ()
{
// if in MT mode: synchronise with
// possibly existing @p alert
// calls. if not in MT mode, this
// is a no-op
lock.acquire ();
// if data was already preloaded,
// then there is no more need to
// load it
if (data_is_preloaded == false)
// reload data. note that this
// function also releases the
// lock
reload_vector (false);
else
{
// clear flag since no more
// needed
data_is_preloaded = false;
// release lock. the lock is
// also released in the other
// branch of the if-clause
lock.release ();
};
}
template <typename number>
void SwappableVector<number>::alert ()
{
#ifndef DEAL_II_WITH_THREADS
// note: this function does nothing
// in non-MT mode
return;
#else
// synchronise with possible other
// invocations of this function and
// other functions in this class
lock.acquire ();
// calling this function multiple
// times does no harm:
if ( (data_is_preloaded == true) ||
// calling this function while the
// vector is active does no harm
// either
(this->size() != 0))
lock.release ();
else
// data has not been preloaded so
// far, so go on! For this, start
// a detached thread
Threads::new_thread (&SwappableVector<number>::reload_vector, *this, true);
// note that reload_vector also
// releases the lock
#endif
}
template <typename number>
void SwappableVector<number>::reload_vector (const bool set_flag)
{
Assert (filename != "", ExcInvalidFilename (filename));
Assert (this->size() == 0, ExcSizeNonzero());
std::ifstream tmp_in(filename.c_str());
this->block_read (tmp_in);
tmp_in.close ();
#ifdef DEAL_II_WITH_THREADS
// release the lock that was
// acquired by the calling
// functions
// set the flag if so required
if (set_flag)
data_is_preloaded = true;
lock.release ();
#endif
}
template <typename number>
void SwappableVector<number>::kill_file ()
{
// if in MT mode, wait for other
// operations to finish first
// (there should be none, but who
// knows). if not in MT mode,
// this is a no-op
Threads::Mutex::ScopedLock lock(this->lock);
// this is too bad: someone
// requested the vector in advance,
// but never got to fetch it. this
// is most probably an error, not?
Assert (data_is_preloaded == false, ExcInternalError());
if (filename != "")
{
int status = std::remove (filename.c_str());
AssertThrow (status == 0, ExcInternalError());
filename = "";
};
}
template <typename number>
const std::string &
SwappableVector<number>::get_filename () const
{
return filename;
}
template <typename number>
std::size_t
SwappableVector<number>::memory_consumption () const
{
return (MemoryConsumption::memory_consumption (filename) +
sizeof(lock) +
MemoryConsumption::memory_consumption (data_is_preloaded) +
Vector<number>::memory_consumption ());
}
DEAL_II_NAMESPACE_CLOSE
#endif // __deal2__swappable_vector_templates_h
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