diff --git a/aos/common/util/thread.cc b/aos/common/util/thread.cc
new file mode 100644
index 0000000..fab62eb
--- /dev/null
+++ b/aos/common/util/thread.cc
@@ -0,0 +1,39 @@
+#include "aos/common/util/thread.h"
+
+#include <pthread.h>
+#include <assert.h>
+
+namespace aos {
+namespace util {
+
+Thread::Thread() : started_(false), joined_(false), should_terminate_(false) {}
+
+Thread::~Thread() {
+  if (started_ && !joined_) {
+    assert(false);
+  }
+}
+
+void Thread::Start() {
+  assert(!started_);
+  started_ = true;
+  assert(pthread_create(&thread_, NULL, &Thread::StaticRun, this) == 0);
+}
+
+void Thread::Join() {
+  assert(!joined_ && started_);
+  joined_ = true;
+  {
+    MutexLocker locker(&should_terminate_mutex_);
+    should_terminate_ = true;
+  }
+  assert(pthread_join(thread_, NULL) == 0);
+}
+
+void *Thread::StaticRun(void *self) {
+  static_cast<Thread *>(self)->Run();
+  return NULL;
+}
+
+}  // namespace util
+}  // namespace aos