Index: kernel/generic/include/proc/thread.h
===================================================================
--- kernel/generic/include/proc/thread.h	(revision 180255fbf234649700144c2f9bd2b18bd7fc92de)
+++ kernel/generic/include/proc/thread.h	(revision 5fd3f2d54a5ccebad2edc13fe02afe1bbcac252f)
@@ -259,4 +259,5 @@
 extern sysarg_t sys_thread_get_id(thread_id_t *);
 extern sysarg_t sys_thread_usleep(uint32_t);
+extern sysarg_t sys_thread_udelay(uint32_t);
 
 #endif
Index: kernel/generic/include/syscall/syscall.h
===================================================================
--- kernel/generic/include/syscall/syscall.h	(revision 180255fbf234649700144c2f9bd2b18bd7fc92de)
+++ kernel/generic/include/syscall/syscall.h	(revision 5fd3f2d54a5ccebad2edc13fe02afe1bbcac252f)
@@ -44,4 +44,5 @@
 	SYS_THREAD_GET_ID,
 	SYS_THREAD_USLEEP,
+	SYS_THREAD_UDELAY,
 	
 	SYS_TASK_GET_ID,