coroutine: initial commit

[SVN r81769]

example/echo.cpp

@@ -0,0 +1,46 @@
+
+//          Copyright Oliver Kowalke 2009.
+// Distributed under the Boost Software License, Version 1.0.
+//    (See accompanying file LICENSE_1_0.txt or copy at
+//          http://www.boost.org/LICENSE_1_0.txt)
+
+#include <cstdlib>
+#include <iostream>
+
+#include <boost/bind.hpp>
+#include <boost/coroutine/all.hpp>
+
+typedef boost::coroutines::coroutine< void() >   coro_t;
+
+void echo( coro_t & ca, int i)
+{
+    std::cout << i; 
+    ca();
+}
+
+void runit( coro_t & ca)
+{
+    std::cout << "started! ";
+    for ( int i = 0; i < 10; ++i)
+    {
+        coro_t c( boost::bind( echo, _1, i) );
+        while ( c)
+            c();
+        ca();
+    }
+}
+
+int main( int argc, char * argv[])
+{
+    {
+        coro_t c( runit);
+        while ( c) {
+            std::cout << "-";
+            c();
+        }
+    }
+
+    std::cout << "\nDone" << std::endl;
+
+    return EXIT_SUCCESS;
+}