Add a simple version of std::async as std_async in async.h and use it

in the RSA and DSA ops.

1 files changed, 33 insertions, 0 deletions

diff --git a/src/utils/async.h b/src/utils/async.h
new file mode 100644
index 000000000..85702c114
--- /dev/null
+++ b/src/utils/async.h
@@ -0,0 +1,33 @@
+/**
+* Standin for C++0x's std::async
+* (C) 2009 Jack Lloyd
+*
+* Distributed under the terms of the Botan license
+*/
+
+#ifndef BOTAN_ASYNC_H__
+#define BOTAN_ASYNC_H__
+
+#include <future>
+#include <thread>
+
+namespace Botan {
+
+/**
+* A simple version of std::async (as it is not in GCC 4.5)
+* Will be removed once GCC supports it natively
+*/
+template<typename F>
+auto std_async(F f) -> std::unique_future<decltype(f())>
+   {
+   typedef decltype(f()) result_type;
+   std::packaged_task<result_type ()> task(std::move(f));
+   std::unique_future<result_type> future = task.get_future();
+   std::thread thread(std::move(task));
+   thread.detach();
+   return future;
+   }
+
+}
+
+#endif