nucleus/library/processes/safe_roller.cpp

   1 /*****************************************************************************\
   2 *                                                                             *
   3 *  Name   : safe_roller                                                       *
   4 *  Author : Chris Koeritz                                                     *
   5 *                                                                             *
   6 *******************************************************************************
   7 * Copyright (c) 1998-$now By Author.  This program is free software; you can  *
   8 * redistribute it and/or modify it under the terms of the GNU General Public  *
   9 * License as published by the Free Software Foundation; either version 2 of   *
  10 * the License or (at your option) any later version.  This is online at:      *
  11 *     http://www.fsf.org/copyleft/gpl.html                                    *
  12 * Please send any updates to: fred@gruntose.com                               *
  13 \*****************************************************************************/
  14
  15 #include "safe_roller.h"
  16
  17 #include <basis/functions.h>
  18 #include <basis/mutex.h>
  19 #include <structures/roller.h>
  20 #include <structures/static_memory_gremlin.h>
  21
  22 using namespace basis;
  23 using namespace structures;
  24
  25 namespace processes {
  26
  27 SAFE_STATIC(mutex, __roller_synch, )
  28
  29 void safe_add(int &to_change, int addition)
  30 {
  31   auto_synchronizer l(__roller_synch());
  32   to_change += addition;
  33 }
  34
  35 //////////////
  36
  37 safe_roller::safe_roller(int start_of_range, int end_of_range)
  38 : _rolling(new int_roller(start_of_range, end_of_range)),
  39   _lock(new mutex)
  40 {
  41 }
  42
  43 safe_roller::~safe_roller()
  44 {
  45   WHACK(_rolling);
  46   WHACK(_lock);
  47 }
  48
  49 int safe_roller::next_id()
  50 {
  51   _lock->lock();
  52   int to_return = _rolling->next_id();
  53   _lock->unlock();
  54   return to_return;
  55 }
  56
  57 int safe_roller::current() const
  58 {
  59   _lock->lock();
  60   int to_return = _rolling->current();
  61   _lock->unlock();
  62   return to_return;
  63 }
  64
  65 void safe_roller::set_current(int new_current)
  66 {
  67   _lock->lock();
  68   _rolling->set_current(new_current);
  69   _lock->unlock();
  70 }
  71
  72 } //namespace.
  73
  74