GNU Radio Manual and C++ API Reference 3.8.5.0
The Free & Open Software Radio Ecosystem
 
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pmt_pool.h
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1/* -*- c++ -*- */
2/*
3 * Copyright 2007,2009,2013 Free Software Foundation, Inc.
4 *
5 * This file is part of GNU Radio
6 *
7 * GNU Radio is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 3, or (at your option)
10 * any later version.
11 *
12 * GNU Radio is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
20 */
21#ifndef INCLUDED_PMT_POOL_H
22#define INCLUDED_PMT_POOL_H
23
24#include <pmt/api.h>
25#include <boost/thread.hpp>
26#include <cstddef>
27#include <vector>
28
29namespace pmt {
30
31/*!
32 * \brief very simple thread-safe fixed-size allocation pool
33 *
34 * FIXME may want to go to global allocation with per-thread free list.
35 * This would eliminate virtually all lock contention.
36 */
38{
39
40 struct PMT_API item {
41 struct item* d_next;
42 };
43
44 typedef boost::unique_lock<boost::mutex> scoped_lock;
45 mutable boost::mutex d_mutex;
46 boost::condition_variable d_cond;
47
48 size_t d_itemsize;
49 size_t d_alignment;
50 size_t d_allocation_size;
51 size_t d_max_items;
52 size_t d_n_items;
53 item* d_freelist;
54 std::vector<char*> d_allocations;
55
56public:
57 /*!
58 * \param itemsize size in bytes of the items to be allocated.
59 * \param alignment alignment in bytes of all objects to be allocated (must be
60 *power-of-2). \param allocation_size number of bytes to allocate at a time from the
61 *underlying allocator. \param max_items is the maximum number of items to allocate.
62 *If this number is exceeded, the allocate blocks. 0 implies no limit.
63 */
64 pmt_pool(size_t itemsize,
65 size_t alignment = 16,
66 size_t allocation_size = 4096,
67 size_t max_items = 0);
69
70 void* malloc();
71 void free(void* p);
72};
73
74} /* namespace pmt */
75
76#endif /* INCLUDED_PMT_POOL_H */
very simple thread-safe fixed-size allocation pool
Definition pmt_pool.h:38
void free(void *p)
void * malloc()
pmt_pool(size_t itemsize, size_t alignment=16, size_t allocation_size=4096, size_t max_items=0)
#define PMT_API
Definition gnuradio-runtime/include/pmt/api.h:30
Definition pmt.h:51