rfnoc: Resolves streamer/link segfaults on python

This commit resolves a segfault that occurs during teardown. Since
teardown isn't detereministic in python, there were cases where the
graph would destruct before the streamers or links got chance to
cleanup. This would result in a segfault. This change gives the lambda
a shared pointer to the object the callback method is calling on, so
that it won't destruct before being called.

1 files changed, 4 insertions, 2 deletions

diff --git a/host/lib/rfnoc/rfnoc_graph.cpp b/host/lib/rfnoc/rfnoc_graph.cpp
index 027d27f81..2e90fb48f 100644
--- a/host/lib/rfnoc/rfnoc_graph.cpp
+++ b/host/lib/rfnoc/rfnoc_graph.cpp
@@ -442,15 +442,17 @@ public:
     uhd::rx_streamer::sptr create_rx_streamer(
         const size_t num_ports, const uhd::stream_args_t& args)
     {
+        auto this_graph = shared_from_this();
         return std::make_shared<rfnoc_rx_streamer>(
-            num_ports, args, [this](const std::string& id) { this->disconnect(id); });
+            num_ports, args, [this_graph](const std::string& id) { this_graph->disconnect(id); });
     }
 
     uhd::tx_streamer::sptr create_tx_streamer(
         const size_t num_ports, const uhd::stream_args_t& args)
     {
+        auto this_graph = shared_from_this();
         return std::make_shared<rfnoc_tx_streamer>(
-            num_ports, args, [this](const std::string& id) { this->disconnect(id); });
+            num_ports, args, [this_graph](const std::string& id) { this_graph->disconnect(id); });
     }
 
     size_t get_num_mboards() const