HelenOS sources

SYS_THREAD_UDELAY   67 kernel/generic/src/syscall/syscall.c 	[SYS_THREAD_UDELAY] = (syshandler_t) sys_thread_udelay,
SYS_THREAD_UDELAY   48 uspace/app/trace/syscalls.c 	[SYS_THREAD_UDELAY] = { "thread_udelay", 1, V_ERRNO },
SYS_THREAD_UDELAY  722 uspace/lib/c/generic/time.c 	(void) __SYSCALL1(SYS_THREAD_UDELAY, (sysarg_t) time);