Ticket #3848 (thanks Nikki Chumakov) and (unrelated) exception_ptr refactoring.

[SVN r59364]

test/copy_exception_test.cpp

@@ -4,25 +4,106 @@
 //file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
 #include <boost/exception_ptr.hpp>
+#include <boost/exception/get_error_info.hpp>
+#include <boost/thread.hpp>
 #include <boost/detail/lightweight_test.hpp>
 
+typedef boost::error_info<struct tag_answer,int> answer;
+
 struct
-test_exception:
-    std::exception
+err:
+    virtual boost::exception,
+    virtual std::exception
     {
     };
 
-int
-main()
+class
+future
     {
-    boost::exception_ptr p = boost::copy_exception(test_exception());
+    public:
+
+    future ():
+        ready_ (false)
+        {
+        }
+
+    void
+    set_exception( boost::exception_ptr const & e )
+        {
+        boost::unique_lock<boost::mutex> lck (mux_);
+        exc_ = e;
+        ready_ = true;
+        cond_.notify_all();
+        }
+
+    void
+    get_exception() const
+        {
+        boost::unique_lock<boost::mutex> lck (mux_);
+        while (! ready_)
+            cond_.wait (lck);
+        rethrow_exception (exc_);
+        }
+
+    private:
+
+    bool ready_;
+    boost::exception_ptr exc_;
+    mutable boost::mutex mux_;
+    mutable boost::condition_variable cond_;
+    };
+
+void
+producer( future & f )
+    {
+    f.set_exception (boost::copy_exception (err () << answer(42)));
+    }
+
+void
+consumer()
+    {
+    future f;
+    boost::thread thr (boost::bind (&producer, boost::ref (f)));
+    try
+        {
+        f.get_exception ();
+        }
+    catch(
+    err & e )
+        {
+        int const * ans=boost::get_error_info<answer>(e);
+        BOOST_TEST(ans && *ans==42);
+        }
+    thr.join();
+    }
+
+void
+consume()
+    {
+    for( int i=0; i!=100; ++i )
+        consumer();
+    }
+
+void
+thread_test()
+    {
+    boost::thread_group grp;
+    for( int i=0; i!=50; ++i )
+        grp.create_thread(&consume);
+    grp.join_all ();
+    }
+
+void
+simple_test()
+    {
+    boost::exception_ptr p = boost::copy_exception(err());
     try
         {
         rethrow_exception(p);
         BOOST_TEST(false);
         }
     catch(
-    test_exception & )
+    err & )
         {
         }
     catch(
@@ -30,5 +111,12 @@ main()
         {
         BOOST_TEST(false);
         }
+    }
+
+int
+main()
+    {
+    simple_test();
+    thread_test();
     return boost::report_errors();
     }