-#define UNLOCK(x) (*(x)=0)
-#define CANCELPT(x) (libc.cancelpt ? libc.cancelpt((x)),0 : (void)(x),0)
-#define CANCELPT_BEGIN CANCELPT(1)
-#define CANCELPT_END CANCELPT(0)
+#define UNLOCK(x) (*(volatile int *)(x)=0)
+
+void __synccall(void (*)(void *), void *);
+void __synccall_wait(void);
+int __setxid(int, int, int, int);