1 | // Copyright (C) 2001-2003 |
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2 | // William E. Kempf |
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3 | // |
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4 | // Distributed under the Boost Software License, Version 1.0. (See accompanying |
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5 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) |
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6 | |
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7 | #include <boost/thread/condition.hpp> |
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8 | #include <boost/thread/mutex.hpp> |
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9 | #include <boost/thread/thread.hpp> |
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10 | #include <iostream> |
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11 | #include <vector> |
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12 | |
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13 | class bounded_buffer : private boost::noncopyable |
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14 | { |
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15 | public: |
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16 | typedef boost::mutex::scoped_lock lock; |
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17 | bounded_buffer(int n) : begin(0), end(0), buffered(0), circular_buf(n) { } |
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18 | void send (int m) { |
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19 | lock lk(monitor); |
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20 | while (buffered == circular_buf.size()) |
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21 | buffer_not_full.wait(lk); |
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22 | circular_buf[end] = m; |
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23 | end = (end+1) % circular_buf.size(); |
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24 | ++buffered; |
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25 | buffer_not_empty.notify_one(); |
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26 | } |
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27 | int receive() { |
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28 | lock lk(monitor); |
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29 | while (buffered == 0) |
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30 | buffer_not_empty.wait(lk); |
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31 | int i = circular_buf[begin]; |
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32 | begin = (begin+1) % circular_buf.size(); |
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33 | --buffered; |
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34 | buffer_not_full.notify_one(); |
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35 | return i; |
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36 | } |
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37 | private: |
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38 | int begin, end, buffered; |
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39 | std::vector<int> circular_buf; |
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40 | boost::condition buffer_not_full, buffer_not_empty; |
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41 | boost::mutex monitor; |
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42 | }; |
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43 | bounded_buffer buf(2); |
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44 | |
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45 | void sender() { |
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46 | int n = 0; |
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47 | while (n < 100) { |
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48 | buf.send(n); |
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49 | std::cout << "sent: " << n << std::endl; |
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50 | ++n; |
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51 | } |
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52 | buf.send(-1); |
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53 | } |
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54 | |
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55 | void receiver() { |
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56 | int n; |
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57 | do { |
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58 | n = buf.receive(); |
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59 | std::cout << "received: " << n << std::endl; |
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60 | } while (n != -1); // -1 indicates end of buffer |
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61 | } |
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62 | |
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63 | int main() |
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64 | { |
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65 | boost::thread thrd1(&sender); |
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66 | boost::thread thrd2(&receiver); |
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67 | thrd1.join(); |
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68 | thrd2.join(); |
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69 | } |
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