New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/base/deferred_task.cpp

@@ -0,0 +1,49 @@
+#include "base/deferred_task.hpp"
+
+namespace base
+{
+DeferredTask::DeferredTask(Duration const & duration) : m_duration(duration)
+{
+  m_thread = threads::SimpleThread([this]
+  {
+    std::unique_lock l(m_mutex);
+    while (!m_terminate)
+    {
+      if (!m_fn)
+      {
+        m_cv.wait(l);
+        continue;
+      }
+
+      if (m_cv.wait_for(l, m_duration) != std::cv_status::timeout || !m_fn)
+        continue;
+
+      auto fn = std::move(m_fn);
+      m_fn = nullptr;
+
+      l.unlock();
+      fn();
+      l.lock();
+    }
+  });
+}
+
+DeferredTask::~DeferredTask()
+{
+  {
+    std::unique_lock l(m_mutex);
+    m_terminate = true;
+  }
+  m_cv.notify_one();
+  m_thread.join();
+}
+
+void DeferredTask::Drop()
+{
+  {
+    std::unique_lock l(m_mutex);
+    m_fn = nullptr;
+  }
+  m_cv.notify_one();
+}
+}  // namespace base