Subject:
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Re: signals / legOS internals
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Newsgroups:
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lugnet.robotics.rcx.legos
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Date:
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Thu, 24 Jun 1999 17:43:49 GMT
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Viewed:
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1140 times
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I wrote:
> I think the following API would be nice:
>
> #define EV_ ... // event mask bits
>
> wait_event(int mask);
>
> wait_event waits for any event specified by the mask to occur, returns when
> that has happened; implementation can be made very efficient on top of (1)
>
> This is mechanism I chose to implement in the "unreleased custom version"
> of Librcx I keep mentioning - a version that will get released at some
> point, when it's all done, but I'm in no hurry.
I should add that since many things are vectored in this version of Librcx,
overriding functionality is easy for the advanced user to do. For example:
extern void (*__event_vector)(void);
void my_setup_func()
{
// ...
__event_vector = my_handler_func;
// ...
}
It turns out that __event_vector is equivalent to the signal mechanism
being discussed. The signal id (if you'd expect that) is implicit in the
address of __event_vector; the updating of the signal handler must be done
explicitly by managing __event_vector yourself.
Actually, I bet this is slightly different from the signal mechanism being
discussed, which probably has one vector per thread/process. Librcx only
has a single, global set of vectors.
-Kekoa
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Message has 1 Reply:
 | | Re: signals / legOS internals
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| (...) So, should I abandon my implementation? If something every bit as good is already there, it may be silly for me to continue. I haven't looked at Librcx yet, so I don't completely understand how it works. I think one of the original reasons for (...) (25 years ago, 26-Jun-99, to lugnet.robotics.rcx.legos)
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Message is in Reply To:
| | Re: signals / legOS internals
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| (...) I think you're missing the point. Now correct me if I'm wrong, Lou -- I believe the intent of the signal mechanism is to allow a way to specify a function to run when a system event occurs: e.g. a message arrives across the IR port. It is (...) (25 years ago, 24-Jun-99, to lugnet.robotics.rcx.legos)
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