diff --git a/aos/linux_code/ipc_lib/condition.cc b/aos/linux_code/ipc_lib/condition.cc
index 0ba4145..ed488c5 100644
--- a/aos/linux_code/ipc_lib/condition.cc
+++ b/aos/linux_code/ipc_lib/condition.cc
@@ -11,8 +11,9 @@
 
 Condition::Condition(Mutex *m) : impl_(), m_(m) {}
 
-void Condition::Wait() {
+bool Condition::Wait() {
   condition_wait(&impl_, &m_->impl_);
+  return false;
 }
 
 void Condition::Signal() {
diff --git a/aos/linux_code/ipc_lib/mutex.cpp b/aos/linux_code/ipc_lib/mutex.cpp
index 8c98204..4bd0759 100644
--- a/aos/linux_code/ipc_lib/mutex.cpp
+++ b/aos/linux_code/ipc_lib/mutex.cpp
@@ -17,9 +17,11 @@
 // Lock and Unlock use the return values of mutex_lock/mutex_unlock
 // to determine whether the lock/unlock succeeded.
 
-void Mutex::Lock() {
+bool Mutex::Lock() {
   if (mutex_grab(&impl_) != 0) {
     PLOG(FATAL, "mutex_grab(%p(=%" PRIu32 ")) failed", &impl_, impl_);
+  } else {
+    return false;
   }
 }