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Date: Mon, 20 Jun 2011 16:27:41 +0200 From: Monica Puig-Pey <puigpeym@...can.es> To: <linux-rt-users@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: synchronization mechanisms Hello! As I told you in previous questions I'm developing drivers using the 2.6.31-11-rt patch under ubuntu 10.04. It is very important for me to know about which real time synchronization mechanisms do I have. I found the RT-mutexes, with priority inherintance, the plists (priority lists) and now I'm looking for more information about semaphores. I haven't found anything relevant in the code that I could know that they work well under real time, having a priority queue of tasks waiting on it. So I've made an easy example where I have 3 kernel threads with different priorities each (60,70,80) in the semaphore queue. Then I see is always the most priority kthread who wakes up the first. Good! It seems to work as a RT semaphore! In my code I have an error. I can use down_interruptible but I can't use down_killable. Why is it? Could anybody give me some help about semaphores in the rt-patch and about any other synchronization mechanism thought for real time? Thanks a lot Mónica -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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