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1 /**
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2 * Stone of Orthanc
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3 * Copyright (C) 2012-2016 Sebastien Jodogne, Medical Physics
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4 * Department, University Hospital of Liege, Belgium
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5 *
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6 * This program is free software: you can redistribute it and/or
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7 * modify it under the terms of the GNU General Public License as
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8 * published by the Free Software Foundation, either version 3 of the
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9 * License, or (at your option) any later version.
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10 *
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11 * In addition, as a special exception, the copyright holders of this
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12 * program give permission to link the code of its release with the
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13 * OpenSSL project's "OpenSSL" library (or with modified versions of it
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14 * that use the same license as the "OpenSSL" library), and distribute
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15 * the linked executables. You must obey the GNU General Public License
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16 * in all respects for all of the code used other than "OpenSSL". If you
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17 * modify file(s) with this exception, you may extend this exception to
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18 * your version of the file(s), but you are not obligated to do so. If
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19 * you do not wish to do so, delete this exception statement from your
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20 * version. If you delete this exception statement from all source files
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21 * in the program, then also delete it here.
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22 *
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23 * This program is distributed in the hope that it will be useful, but
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24 * WITHOUT ANY WARRANTY; without even the implied warranty of
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25 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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26 * General Public License for more details.
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27 *
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28 * You should have received a copy of the GNU General Public License
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29 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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30 **/
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31
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32
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33 #pragma once
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34
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35 #include <vector>
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36 #include <boost/noncopyable.hpp>
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37 #include <boost/thread/mutex.hpp>
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38
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39 namespace OrthancStone
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40 {
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41 class DownloadStack : public boost::noncopyable
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42 {
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43 private:
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44 static const int NIL = -1;
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45
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46 // This is a doubly-linked list
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47 struct Node
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48 {
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49 int next_;
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50 int prev_;
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51 bool dequeued_;
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52 };
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53
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54 boost::mutex mutex_;
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55 std::vector<Node> nodes_;
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56 int firstNode_;
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57
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58 bool CheckInvariants() const;
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59
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60 void SetTopNodeInternal(unsigned int value);
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61
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62 public:
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63 DownloadStack(unsigned int size);
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64
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65 ~DownloadStack();
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66
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67 bool Pop(unsigned int& value);
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68
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69 class Writer : public boost::noncopyable
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70 {
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71 private:
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72 DownloadStack& that_;
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73 boost::mutex::scoped_lock lock_;
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74
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75 public:
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76 Writer(DownloadStack& that) :
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77 that_(that),
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78 lock_(that.mutex_)
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79 {
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80 }
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81
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82 void SetTopNode(unsigned int value);
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83
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84 void SetTopNodePermissive(int value);
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85 };
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86 };
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87 }
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