microwave safety interlock inversion
Sep. 16th, 2002 11:18 pmI hit the door-open button just before the microwave finished running. This is supposed to shut it off and open the door. It opened the door, but didn't shut the thing off. That is, the light and turntable and fan stayed on; I don't know about the magnetron. I shut the door promptly anyway. (I'm not too uptight about microwave exposure but it's not like I bathe in the stuff.) Everything went off.
I cracked open the door again. The microwave fired up. I shut the door.
Pulled the plug on the sucker, gave it a minute to think over its deeds. Plugged it back in, opened the door. Dark.
I wonder if I hit some race condition in that narrow window just as it was shutting itself off, like the machinery and the internal state flag are not updated atomically together. That would be silly.
Did your formal-languages class have that homework assignment where you drew a state transition diagram for a microwave? Did GE buy it cheap?
I cracked open the door again. The microwave fired up. I shut the door.
Pulled the plug on the sucker, gave it a minute to think over its deeds. Plugged it back in, opened the door. Dark.
I wonder if I hit some race condition in that narrow window just as it was shutting itself off, like the machinery and the internal state flag are not updated atomically together. That would be silly.
Did your formal-languages class have that homework assignment where you drew a state transition diagram for a microwave? Did GE buy it cheap?
no subject
Date: 2002-09-17 07:52 am (UTC)no subject
Date: 2002-09-17 01:54 pm (UTC)no subject
Date: 2002-09-17 01:59 pm (UTC)