77 lines
2.5 KiB
C++
77 lines
2.5 KiB
C++
/* -*- c++ -*- ----------------------------------------------------------
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LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
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https://www.lammps.org/, Sandia National Laboratories
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LAMMPS development team: developers@lammps.org
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Copyright (2003) Sandia Corporation. Under the terms of Contract
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DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
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certain rights in this software. This software is distributed under
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the GNU General Public License.
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See the README file in the top-level LAMMPS directory.
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------------------------------------------------------------------------- */
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#ifndef LAMMPS_MY_POOL_CHUNK_H
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#define LAMMPS_MY_POOL_CHUNK_H
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namespace LAMMPS_NS {
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template <class T> class MyPoolChunk {
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public:
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int ndatum; // total # of stored datums
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int nchunk; // total # of stored chunks
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MyPoolChunk(int user_minchunk = 1, int user_maxchunk = 1, int user_nbin = 1,
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int user_chunkperpage = 1024, int user_pagedelta = 1);
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// free all allocated memory
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~MyPoolChunk();
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// return pointer/index of unused chunk of size maxchunk
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T *get(int &index);
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// return pointer/index of unused chunk of size N
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T *get(int n, int &index);
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// return indexed chunk to pool via free list
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// index = -1 if no allocated chunk
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void put(int index);
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// total memory used in bytes
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double size() const;
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/** Return error status
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*
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* \return 0 if no error, 1 if invalid input, 2 if malloc() failed, 3 if chunk > maxchunk */
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int status() const { return errorflag; }
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private:
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int minchunk; // min # of datums per chunk
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int maxchunk; // max # of datums per chunk
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int nbin; // # of bins to split min-to-max into
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int chunkperpage; // # of chunks on every page, regardless of which bin
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int pagedelta; // # of pages to allocate at once, default = 1
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int binsize; // delta in chunk sizes between adjacent bins
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int errorflag; // flag > 0 if error has occurred
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// 1 = invalid inputs
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// 2 = memory allocation error
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// 3 = chunk size exceeded maxchunk
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T **pages; // list of allocated pages
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int *whichbin; // which bin each page belongs to
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int npage; // # of allocated pages
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int *freelist; // each chunk points to next unused chunk in same bin
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int *freehead; // index of first unused chunk in each bin
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int *chunksize; // size of chunks in each bin
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void allocate(int ibin);
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};
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} // namespace LAMMPS_NS
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#endif
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