Re: Composing tasks and protected objects
- From: Jeffrey Carter <spam@xxxxxxxx>
- Date: Sat, 06 Aug 2005 05:52:11 GMT
Florian Weimer wrote:
Suppose I want to write a selective accept which reads messages from a queue, and also support a special entry call to reload the configuration.
You need all calls to go the same way. Right now you're trying to do something like
+----------+ +----------+ +----------+ | | | | | | | Q |<--Get----| Server |<--Shut---| ? | | | | | Down | | | | | |<--Reload-| | | | | | | | +----------+ +----------+ +----------+
where arrows indicate direction of call. This won't work, but it will work if you can turn that call to Get around. For this, you need a forwarder between the Queue and Server:
+----------+ +----------+ +----------+ +----------+ | | | | | | | | | Q |<-Get--| Forwarder|--Msg->| Server |<-Etc--| ? | | | | | | | | | +----------+ +----------+ +----------+ +----------+
Now your task can look like
select
accept Msg (Message : in ...) do
Current_Message := Message;
end Msg;Process_Message (Current_Message); or ... -- as in your example end select;
The only difficulty is terminating the Forwarder.
-- Jeff Carter "Go and boil your bottoms." Monty Python & the Holy Grail 01 .
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