1 files changed, 12 insertions, 8 deletions
diff --git a/cpukit/score/src/apimutexlock.c b/cpukit/score/src/apimutexlock.c
index ca824a6e6c..3618af1d8a 100644
--- a/cpukit/score/src/apimutexlock.c
+++ b/cpukit/score/src/apimutexlock.c
@@ -16,15 +16,19 @@
 #include <rtems/system.h>
 #include <rtems/score/apimutex.h>
 
-void _API_Mutex_Unlock(
+void _API_Mutex_Lock(
   API_Mutex_Control *the_mutex
 )
 {
-  _Thread_Disable_dispatch();
-    _CORE_mutex_Surrender(
-      &the_mutex->Mutex,
-      the_mutex->Object.id,
-      NULL
-   );
-  _Thread_Enable_dispatch();
+  ISR_Level level; 
+
+  _ISR_Disable( level );
+
+  _CORE_mutex_Seize(
+    &the_mutex->Mutex,
+    the_mutex->Object.id,
+    TRUE,
+    0,
+    level
+  );
 }