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Re: [Corelinux-develop] Recursion in EventSemaphore
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From: Hans - D. <dul...@eg...> - 2000-08-29 23:48:52
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On Tue, 29 Aug 2000, Frank V. Castellucci wrote: > Date: Tue, 29 Aug 2000 06:44:41 -0400 > From: Frank V. Castellucci <fr...@co...> > Reply-To: cor...@li... > To: cor...@li... > Subject: Re: [Corelinux-develop] Recursion in EventSemaphore > > Hans - Dulimarta wrote: > > > > For the next release (0.4.27), I will implement EventSemaphore with > > "infinite" number of listeners. Any process/thread that wants to wait > > for an event (lock itself to the event) will be allowed to do so. > > Thats fine, but the requirement does call for limiting the number of > listeners (see Balking), which would turn away threads when the limit is > reached. > The signature of the EventSemaphore constructor does not have any formal parameter which can be used to specify the maximum limit of listeners. I could not find this either in the .mdf files. Again, I am assuming that the design of EventSemaphore class interface is final and I am not supposed to change it. > > So, from what I could understand by reading the code and the "manual", > > for this "infinite" listener version of EvSem the recursion mode is > > irrelevant. Am I making a correct assumption? > > It feels like it would be irrelevant to register a single thread more > than once. I assume that you are tracking which threads are listening on > a EventSemaphore and can detect this? If so, the question remains, is it > an error or intentional usage by the user? How is it possible for a single thread to register more than once. Once a thread register (wait for event) it will be blocked until the event takes place, or if it enables balking mode it will not be registered and hence it won't be blocked. No, I don't keep any track of who are listening to the event. I prefer to make the data member of EventSemaphore as minimal as possible. > > > -- > > Hans Dulimarta, Ph.D. dul...@co... > > P: 517-432-7589 http://www.egr.msu.edu/~dulimart > > F: 760-281-7691 http://corelinux.sourceforge.net > > Elec. & Comp. Engg., Mich. State Univ., E. Lansing, MI 48824 > > > > _______________________________________________ > > Corelinux-develop mailing list > > Cor...@li... > > http://lists.sourceforge.net/mailman/listinfo/corelinux-develop > > -- Hans Dulimarta, Ph.D. dul...@co... P: 517-432-7589 http://www.egr.msu.edu/~dulimart F: 760-281-7691 http://corelinux.sourceforge.net Elec. & Comp. Engg., Mich. State Univ., E. Lansing, MI 48824 |
