HelenOS sources

sys_thread_udelay  306 kernel/generic/include/proc/thread.h extern sys_errno_t sys_thread_udelay(uint32_t);
sys_thread_udelay   67 kernel/generic/src/syscall/syscall.c 	[SYS_THREAD_UDELAY] = (syshandler_t) sys_thread_udelay,