6.14.9 `sleep'
--------------

sleep(INTERVAL)
     :: $B%W%m%;%9$N<B9T$rDd;_(B

RETURN
     1

INTERVAL
     $BDd;_;~4V(B ($B%^%$%/%mIC(B)

   * `sleep()' $B$O(B, $B%W%m%;%9$N<B9T$rDd;_$9$k(B.  UNIX $B$N>l9g(B, usleep
     $B$r8F$s$G$$$k$@$1$G$"$k(B.


     [0] sleep(1000);
     1
     [1]

