diff --git a/src/async/mutex.cpp b/src/async/mutex.cpp
new file mode 100644
index 0000000..44694c6
--- /dev/null
+++ b/src/async/mutex.cpp
@@ -0,0 +1,54 @@
+#include <sdbusplus/async/mutex.hpp>
+
+namespace sdbusplus::async
+{
+
+mutex::mutex(const std::string& name) : name(name) {}
+
+void mutex::unlock()
+{
+    std::unique_lock l{lock};
+    if (waitingTasks.empty())
+    {
+        auto wasLocked = std::exchange(locked, false);
+        if (!wasLocked)
+        {
+            try
+            {
+                throw std::runtime_error("mutex is not locked!");
+            }
+            catch (...)
+            {
+                std::terminate();
+            }
+        }
+        return;
+    }
+    // Wake up the next waiting task
+    auto completion = std::move(waitingTasks.front());
+    waitingTasks.pop();
+    l.unlock();
+    completion->complete();
+}
+
+namespace mutex_ns
+{
+
+void mutex_completion::arm() noexcept
+{
+    std::unique_lock l{mutexInstance.lock};
+
+    auto wasLocked = std::exchange(mutexInstance.locked, true);
+    if (!wasLocked)
+    {
+        l.unlock();
+        complete();
+        return;
+    }
+
+    mutexInstance.waitingTasks.push(this);
+}
+
+} // namespace mutex_ns
+
+} // namespace sdbusplus::async