uhd: added tasks to simplify thread spawning use cases

2 files changed, 76 insertions, 0 deletions

diff --git a/host/lib/utils/CMakeLists.txt b/host/lib/utils/CMakeLists.txt
index c8268c7b0..fd3249099 100644
--- a/host/lib/utils/CMakeLists.txt
+++ b/host/lib/utils/CMakeLists.txt
@@ -136,5 +136,6 @@ LIBUHD_APPEND_SOURCES(
     ${CMAKE_CURRENT_SOURCE_DIR}/paths.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/props.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/static.cpp
+    ${CMAKE_CURRENT_SOURCE_DIR}/tasks.cpp
     ${CMAKE_CURRENT_SOURCE_DIR}/thread_priority.cpp
 )
diff --git a/host/lib/utils/tasks.cpp b/host/lib/utils/tasks.cpp
new file mode 100644
index 000000000..ef56bb2de
--- /dev/null
+++ b/host/lib/utils/tasks.cpp
@@ -0,0 +1,75 @@
+//
+// Copyright 2011 Ettus Research LLC
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+//
+// You should have received a copy of the GNU General Public License
+// along with this program.  If not, see <http://www.gnu.org/licenses/>.
+//
+
+#include <uhd/utils/tasks.hpp>
+#include <uhd/utils/msg.hpp>
+#include <boost/thread/thread.hpp>
+#include <boost/thread/barrier.hpp>
+#include <exception>
+#include <iostream>
+
+using namespace uhd;
+
+class task_impl : public task{
+public:
+
+    task_impl(const task_fcn_type &task_fcn){
+        boost::barrier spawn_barrier(2);
+        _thread_group.create_thread(boost::bind(&task_impl::task_loop, this, task_fcn, boost::ref(spawn_barrier)));
+        spawn_barrier.wait();
+    }
+
+    ~task_impl(void){
+        _thread_group.interrupt_all();
+        _thread_group.join_all();
+    }
+
+private:
+
+    void task_loop(const task_fcn_type &task_fcn, boost::barrier &spawn_barrier){
+        spawn_barrier.wait();
+
+        try{
+            while (not boost::this_thread::interruption_requested()){
+                task_fcn();
+            }
+        }
+        catch(const boost::thread_interrupted &){
+            //this is an ok way to exit the task loop
+        }
+        catch(const std::exception &e){
+            do_error_msg(e.what());
+        }
+        catch(...){
+            do_error_msg("unknown exception");
+        }
+    }
+
+    void do_error_msg(const std::string &msg){
+        UHD_MSG(error)
+            << "An unexpected exception was caught in a task loop." << std::endl
+            << "The task loop will now exit, things may not work." << std::endl
+            << msg << std::endl
+        ;
+    }
+
+    boost::thread_group _thread_group;
+};
+
+task::sptr task::make(const task_fcn_type &task_fcn){
+    return task::sptr(new task_impl(task_fcn));
+}