uhd: added new calls to streamer object + support work

* The transmit streamer gives access to the async msg queue.
* The receive streamer gives access to the issue stream cmd.
* Supporting usrp implementation files updated.
* Example applications updated to use this API.

1 files changed, 11 insertions, 0 deletions

diff --git a/host/lib/usrp/usrp1/io_impl.cpp b/host/lib/usrp/usrp1/io_impl.cpp
index 8940a92bb..d384eb13f 100644
--- a/host/lib/usrp/usrp1/io_impl.cpp
+++ b/host/lib/usrp/usrp1/io_impl.cpp
@@ -356,6 +356,11 @@ public:
         return _stc->recv_post(metadata, num_samps_recvd);
     }
 
+    void issue_stream_cmd(const stream_cmd_t &stream_cmd)
+    {
+        _stc->issue_stream_cmd(stream_cmd);
+    }
+
 private:
     size_t _max_num_samps;
     soft_time_ctrl::sptr _stc;
@@ -410,6 +415,12 @@ public:
         return num_samps_sent;
     }
 
+    bool recv_async_msg(
+        async_metadata_t &async_metadata, double timeout = 0.1
+    ){
+        return _stc->get_async_queue().pop_with_timed_wait(async_metadata, timeout);
+    }
+
 private:
     size_t _max_num_samps;
     soft_time_ctrl::sptr _stc;