atomkernel: Support thread entry points running to completion. Ports which use a thread_shell() can allow the entry point to finish and return back to the thread_shell(), which sets the terminated flag and calls the scheduler to force another thread to be scheduled in. Currently implemented in the ARM and AVR ports.

ports/arm/atomport.c

@@ -97,7 +97,7 @@ static void thread_shell (void)
     _reclaim_reent (&(curr_tcb->port_priv.reent));
 
     /* Thread has run to completion: remove it from the ready list */
-    curr_tcb->suspended = TRUE;
+    curr_tcb->terminated = TRUE;
     atomSched (FALSE);
 }
 

ports/avr/atomport.c

@@ -111,8 +111,9 @@ static void thread_shell (void)
         curr_tcb->entry_point(curr_tcb->entry_param);
     }
 
-    /* Not reached - threads should never return from the entry point */
-
+    /* Thread has run to completion: remove it from the ready list */
+    curr_tcb->terminated = TRUE;
+    atomSched (FALSE);
 }