diff --git a/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_kernel.c b/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_kernel.c
index d9edfd1426..8284034f2f 100644
--- a/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_kernel.c
+++ b/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_kernel.c
@@ -24,6 +24,7 @@
  */
 
 #include "rtx_lib.h"
+#include "rt_OsEventObserver.h"
 
 
 //  OS Runtime Information
@@ -543,6 +544,15 @@ osStatus_t osKernelStart (void) {
     EvrRtxKernelError(osErrorISR);
     return osErrorISR;
   }
+
+  /* Call the pre-start event (from unprivileged mode) if the handler exists
+   * and the kernel is not running. */
+  /* FIXME osEventObs needs to be readable but not writable from unprivileged
+   * code. */
+  if (osKernelGetState() != osKernelRunning && osEventObs && osEventObs->pre_start) {
+    osEventObs->pre_start();
+  }
+
   return __svcKernelStart();
 }
 
diff --git a/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_thread.c b/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_thread.c
index bec6712794..4f4067e42a 100644
--- a/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_thread.c
+++ b/rtos/TARGET_CORTEX/rtx5/RTX/Source/rtx_thread.c
@@ -24,7 +24,7 @@
  */
 
 #include "rtx_lib.h"
-
+#include "rt_OsEventObserver.h"
 
 //  ==== Helper functions ====
 
@@ -413,6 +413,10 @@ void osRtxThreadSwitch (os_thread_t *thread) {
   osRtxInfo.thread.run.next = thread;
   osRtxThreadStackCheck();
   EvrRtxThreadSwitch(thread);
+
+  if (osEventObs && osEventObs->thread_switch) {
+    osEventObs->thread_switch(thread->context);
+  }
 }
 
 /// Dispatch specified Thread or Ready Thread with Highest Priority.
@@ -766,6 +770,13 @@ osThreadId_t svcRtxThreadNew (osThreadFunc_t func, void *argument, const osThrea
 
   EvrRtxThreadCreated(thread);
 
+  /* Notify the OS event observer of a new thread. */
+  if (osEventObs && osEventObs->thread_create) {
+    thread->context = osEventObs->thread_create((int)thread, context);
+  } else {
+    thread->context = context;
+  }
+
   osRtxThreadDispatch(thread);
 
   return thread;
@@ -1212,6 +1223,10 @@ osStatus_t svcRtxThreadTerminate (osThreadId_t thread_id) {
       return osErrorResource;
   }
 
+  if (osEventObs && osEventObs->thread_destroy) {
+    osEventObs->thread_destroy(thread->context);
+  }
+
   // Release owned Mutexes
   osRtxMutexOwnerRelease(thread->mutex_list);