1 | #include <boost/exception.hpp>
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2 | #include <boost/thread.hpp>
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3 | #include <string>
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4 |
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5 | typedef boost::error_info<struct tag_throw_string, std::string> err_info;
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6 |
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7 | class err
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8 | : public boost::exception
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9 | , public std::exception
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10 | {
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11 | };
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12 |
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13 | class future
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14 | {
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15 | public:
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16 | future () : ready_ (false) {}
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17 |
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18 | void set_exception (boost::exception_ptr const& e)
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19 | {
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20 | boost::unique_lock<boost::mutex> lck (mux_);
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21 | exc_ = e;
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22 | ready_ = true;
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23 | cond_.notify_all();
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24 | }
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25 |
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26 | void get_exception () const
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27 | {
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28 | boost::unique_lock<boost::mutex> lck (mux_);
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29 | while (! ready_)
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30 | cond_.wait (lck);
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31 | rethrow_exception (exc_);
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32 | }
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33 |
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34 | private:
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35 | bool ready_;
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36 | boost::exception_ptr exc_;
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37 | mutable boost::mutex mux_;
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38 | mutable boost::condition_variable cond_;
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39 | };
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40 |
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41 | void producer (future& f)
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42 | {
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43 | f.set_exception (boost::copy_exception (err () << err_info ("stub")));
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44 | }
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45 |
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46 | void consumer ()
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47 | {
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48 | future f;
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49 | boost::thread thr (boost::bind (&producer, boost::ref (f)));
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50 |
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51 | try { f.get_exception (); }
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52 | catch (err const& e) {}
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53 |
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54 | thr.join ();
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55 | }
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56 |
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57 |
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58 | void consume ()
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59 | {
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60 | for (int i=0;i<100;++i)
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61 | consumer ();
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62 | }
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63 |
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64 | int main ()
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65 | {
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66 | boost::thread_group grp;
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67 | for (int i=0; i<50; ++i)
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68 | grp.create_thread (&consume);
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69 |
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70 | grp.join_all ();
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71 | }
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72 |
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