rfnoc: Add shutdown feature to blocks

On destruction, the rfnoc_graph will call shutdown() on all blocks. This
allows a safe de-initialization of blocks independent of the lifetime of
the noc_block_base::sptr.

Also adds the shutdown feature to null_block_control.

2 files changed, 15 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/rfnoc/block_container.hpp b/host/lib/include/uhdlib/rfnoc/block_container.hpp
index e32feed52..b43a7bc61 100644
--- a/host/lib/include/uhdlib/rfnoc/block_container.hpp
+++ b/host/lib/include/uhdlib/rfnoc/block_container.hpp
@@ -43,6 +43,12 @@ public:
      */
     noc_block_base::sptr get_block(const block_id_t& block_id) const;
 
+    /*! Call shutdown() on all blocks
+     *
+     * After calling this, blocks won't be able to do anything anymore!
+     */
+    void shutdown();
+
 private:
     //! Lock access to the storage
     mutable std::mutex _mutex;
diff --git a/host/lib/include/uhdlib/rfnoc/node_accessor.hpp b/host/lib/include/uhdlib/rfnoc/node_accessor.hpp
index 3351c5531..93e2733cf 100644
--- a/host/lib/include/uhdlib/rfnoc/node_accessor.hpp
+++ b/host/lib/include/uhdlib/rfnoc/node_accessor.hpp
@@ -108,6 +108,15 @@ public:
     {
         return node->check_topology(connected_inputs, connected_outputs);
     }
+
+    /*! Put a node into shutdown
+     *
+     * See node_t::shutdown(), and also noc_block_base::shutdown() for details.
+     */
+    void shutdown(node_t* node)
+    {
+        node->shutdown();
+    }
 };