void _threaddebug(ulong, char *fmt, ...);void _threadfatal(char *fmt, ...);void _threadassert(char *s); extern int _threaddebuglevel; #define DBGAPPL	(1 << 0)#define DBGTHRD	(1 << 16)#define DBGCHAN	(1 << 17)#define DBGREND	(1 << 18)#define DBGKILL	(1 << 19)#define DBGNOTE	(1 << 20)#define DBGQUE	(1 << 21)#define DBGCHLD	(1 << 22)#define DBGPROC	(1 << 23) #define	threadassert(x)	if(x);else _threadassert("x")