Ur/Web: demo/ref.ur annotate

Fix a read-after-free bug using a timestamp check

author	Adam Chlipala <adam@chlipala.net>
date	Thu, 19 Nov 2015 13:18:58 -0500
parents	5819fb63c93a
children

rev	line source
adamc@419	1 structure IR = RefFun.Make(struct
adamc@643	2 type data = int
adamc@419	3 end)
adamc@419	4
adamc@419	5 structure SR = RefFun.Make(struct
adamc@643	6 type data = string
adamc@419	7 end)
adamc@419	8
adamc@732	9 fun mutate () =
adamc@419	10 ir <- IR.new 3;
adamc@419	11 ir' <- IR.new 7;
adamc@419	12 sr <- SR.new "hi";
adamc@419	13
adamc@434	14 IR.write ir' 10;
adamc@419	15
adamc@419	16 iv <- IR.read ir;
adamc@419	17 iv' <- IR.read ir';
adamc@419	18 sv <- SR.read sr;
adamc@419	19
adamc@434	20 IR.delete ir;
adamc@434	21 IR.delete ir';
adamc@434	22 SR.delete sr;
adamc@419	23
adamc@419	24 return <xml><body>
adamc@419	25 {[iv]}, {[iv']}, {[sv]}
adamc@419	26 </body></xml>
adamc@732	27
adamc@732	28 fun main () = return <xml><body>
adamc@732	29 <form><submit action={mutate} value="Do some pointless stuff"/></form>
adamc@732	30 </body></xml>

Mercurial > urweb