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1 | // Copyright (C) 2002-2003 |
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2 | // David Moore, William E. Kempf |
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3 | // |
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4 | // Permission to use, copy, modify, distribute and sell this software |
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5 | // and its documentation for any purpose is hereby granted without fee, |
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6 | // provided that the above copyright notice appear in all copies and |
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7 | // that both that copyright notice and this permission notice appear |
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8 | // in supporting documentation. William E. Kempf makes no representations |
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9 | // about the suitability of this software for any purpose. |
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10 | // It is provided "as is" without express or implied warranty. |
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11 | |
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12 | #include <boost/thread/detail/config.hpp> |
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13 | #include <boost/thread/barrier.hpp> |
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14 | #include <string> // see http://article.gmane.org/gmane.comp.lib.boost.devel/106981 |
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15 | |
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16 | namespace boost { |
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17 | |
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18 | barrier::barrier(unsigned int count) |
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19 | : m_threshold(count), m_count(count), m_generation(0) |
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20 | { |
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21 | if (count == 0) |
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22 | throw std::invalid_argument("count cannot be zero."); |
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23 | } |
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24 | |
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25 | barrier::~barrier() |
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26 | { |
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27 | } |
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28 | |
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29 | bool barrier::wait() |
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30 | { |
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31 | boost::mutex::scoped_lock lock(m_mutex); |
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32 | unsigned int gen = m_generation; |
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33 | |
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34 | if (--m_count == 0) |
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35 | { |
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36 | m_generation++; |
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37 | m_count = m_threshold; |
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38 | m_cond.notify_all(); |
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39 | return true; |
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40 | } |
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41 | |
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42 | while (gen == m_generation) |
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43 | m_cond.wait(lock); |
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44 | return false; |
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45 | } |
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46 | |
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47 | } // namespace boost |
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