rfnoc: Add device_id allocator

This is a single atomic allocator in the global uhd::rfnoc namespace, so
that devices can allocate themselves device IDs without having to confer
with the rest of the RFNoC infrastructure.

3 files changed, 40 insertions, 0 deletions

diff --git a/host/lib/include/uhdlib/rfnoc/device_id.hpp b/host/lib/include/uhdlib/rfnoc/device_id.hpp
new file mode 100644
index 000000000..d4cecc840
--- /dev/null
+++ b/host/lib/include/uhdlib/rfnoc/device_id.hpp
@@ -0,0 +1,22 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#ifndef INCLUDED_LIBUHD_DEVICE_ID_HPP
+#define INCLUDED_LIBUHD_DEVICE_ID_HPP
+
+#include <uhdlib/rfnoc/rfnoc_common.hpp>
+
+namespace uhd { namespace rfnoc {
+
+//! Return a new, unique device ID.
+//
+// This function will never return the same device ID twice.
+device_id_t allocate_device_id();
+
+}} /* namespace uhd::rfnoc */
+
+#endif /* INCLUDED_LIBUHD_DEVICE_ID_HPP */
+
diff --git a/host/lib/rfnoc/CMakeLists.txt b/host/lib/rfnoc/CMakeLists.txt
index 1b627d304..0f9d62c51 100644
--- a/host/lib/rfnoc/CMakeLists.txt
+++ b/host/lib/rfnoc/CMakeLists.txt
@@ -24,6 +24,7 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/chdr_packet.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/client_zero.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/ctrl_iface.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/device_id.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/epid_allocator.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/graph_impl.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/graph.cpp
diff --git a/host/lib/rfnoc/device_id.cpp b/host/lib/rfnoc/device_id.cpp
new file mode 100644
index 000000000..6bd287dce
--- /dev/null
+++ b/host/lib/rfnoc/device_id.cpp
@@ -0,0 +1,17 @@
+//
+// Copyright 2019 Ettus Research, a National Instruments Brand
+//
+// SPDX-License-Identifier: GPL-3.0-or-later
+//
+
+#include <uhdlib/rfnoc/device_id.hpp>
+#include <atomic>
+
+using namespace uhd::rfnoc;
+
+device_id_t uhd::rfnoc::allocate_device_id()
+{
+    static std::atomic<device_id_t> counter{1};
+    return counter++;
+}
+