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/* -*- c++ -*- */
/*
* Copyright 2007,2009 Free Software Foundation, Inc.
*
* This file is part of GNU Radio
*
* GNU Radio is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3, or (at your option)
* any later version.
*
* GNU Radio 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#ifndef INCLUDED_PMT_POOL_H
#define INCLUDED_PMT_POOL_H
#include <cstddef>
#include <vector>
#include <boost/thread.hpp>
/*!
* \brief very simple thread-safe fixed-size allocation pool
*
* FIXME may want to go to global allocation with per-thread free list.
* This would eliminate virtually all lock contention.
*/
class pmt_pool {
struct item {
struct item *d_next;
};
typedef boost::unique_lock<boost::mutex> scoped_lock;
mutable boost::mutex d_mutex;
boost::condition_variable d_cond;
size_t d_itemsize;
size_t d_alignment;
size_t d_allocation_size;
size_t d_max_items;
size_t d_n_items;
item *d_freelist;
std::vector<char *> d_allocations;
public:
/*!
* \param itemsize size in bytes of the items to be allocated.
* \param alignment alignment in bytes of all objects to be allocated (must be power-of-2).
* \param allocation_size number of bytes to allocate at a time from the underlying allocator.
* \param max_items is the maximum number of items to allocate. If this number is exceeded,
* the allocate blocks. 0 implies no limit.
*/
pmt_pool(size_t itemsize, size_t alignment = 16,
size_t allocation_size = 4096, size_t max_items = 0);
~pmt_pool();
void *malloc();
void free(void *p);
};
#endif /* INCLUDED_PMT_POOL_H */
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