server/supernova/utilities/static_pool.hpp

   1 //  static pool class
   2 //  Copyright (C) 2009 Tim Blechmann
   3 //
   4 //  This program is free software; you can redistribute it and/or modify
   5 //  it under the terms of the GNU General Public License as published by
   6 //  the Free Software Foundation; either version 2 of the License, or
   7 //  (at your option) any later version.
   8 //
   9 //  This program is distributed in the hope that it will be useful,
  10 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 //  GNU General Public License for more details.
  13 //
  14 //  You should have received a copy of the GNU General Public License
  15 //  along with this program; see the file COPYING.  If not, write to
  16 //  the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  17 //  Boston, MA 02111-1307, USA.
  18
  19 #ifndef UTILITIES_STATIC_POOL_HPP
  20 #define UTILITIES_STATIC_POOL_HPP
  21
  22 extern "C"
  23 {
  24 #include "tlsf.h"
  25 }
  26
  27 #include <array>
  28
  29 #include <boost/noncopyable.hpp>
  30 #include <boost/static_assert.hpp>
  31 #include <boost/mpl/arithmetic.hpp>
  32 #include <boost/mpl/modulus.hpp>
  33
  34 #include "nova-tt/spin_lock.hpp"
  35 #include "nova-tt/dummy_mutex.hpp"
  36 #include "nova-tt/mlock.hpp"
  37
  38 namespace nova {
  39
  40 template <std::size_t bytes,
  41           bool blocking = false>
  42 class static_pool:
  43     boost::noncopyable
  44 {
  45     BOOST_STATIC_ASSERT((boost::mpl::modulus<boost::mpl::int_<bytes>, boost::mpl::int_<sizeof(long)> >::value == 0));
  46
  47     static const std::size_t poolsize = bytes/sizeof(long);
  48
  49     typedef typename boost::mpl::if_c<blocking,
  50                                       spin_lock,
  51                                       dummy_mutex>::type mutex_type;
  52
  53     typedef typename mutex_type::scoped_lock scoped_lock;
  54
  55     struct data:
  56         mutex_type
  57     {
  58         std::array<long, poolsize> pool;
  59     };
  60
  61     void lock_memory(void)
  62     {
  63         mlock(data_.pool.data(), poolsize * sizeof(long));
  64     }
  65
  66 public:
  67     static_pool(bool lock = false) throw()
  68     {
  69         /* first lock, then assign */
  70         if (lock)
  71             lock_memory();
  72
  73         data_.pool.fill(0);
  74         std::size_t status = init_memory_pool(bytes, data_.pool.begin());
  75         assert(status > 0);
  76
  77     }
  78
  79     ~static_pool() throw()
  80     {
  81         scoped_lock lock(data_);
  82         destroy_memory_pool(data_.pool.begin());
  83     }
  84
  85     void * malloc(std::size_t size)
  86     {
  87         scoped_lock lock(data_);
  88         return malloc_ex(size, data_.pool.begin());
  89     }
  90
  91     void free(void * p)
  92     {
  93         scoped_lock lock(data_);
  94         free_ex(p, data_.pool.begin());
  95     }
  96
  97     std::size_t get_max_size(void)
  98     {
  99         return ::get_max_size(data_.pool.begin());
 100     }
 101
 102 private:
 103     data data_;
 104 };
 105
 106 } /* namespace nova */
 107
 108 #endif /* UTILITIES_STATIC_POOL_HPP */
 109