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On 2014-08-13, Alec Ten Harmsel <alec@××××××××××××××.com> wrote: |
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>> I may have to stick with sockets when I want to block until some event |
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>> happens. |
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> |
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> To be clear, do you want to block or sleep/yield until an event |
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> happens? |
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I don't see the difference -- isn't that what a blocking call does: |
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sleep/yield until some event happens? |
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> I'm sorry for not being too helpful. Just one last question: Can you |
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> describe what exactly your code is supposed to do, or is it something |
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> that you can't talk about because it's a work thing? I don't care |
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> either way, but I'm just curious because it seems you need to |
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> optimize quite a bit. |
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One process implements a communications protocol that is maintaining |
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communications links with a handful of slave devices connected to |
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serial ports running at baud rates up to 230400 baud (38400 is the |
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most common). There are typically one (or maybe two) hundred messages |
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per second being exchanged with each slave device. I'll call that |
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process the server. |
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There are other client processes that want to access the slaves and |
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the inforamation being received from them. Some of the clients just |
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want to do low-frequency transactions for configuration/diagnostic |
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purposes, and Unix domain sockets work fine for that. |
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Other clients may want to wake up every time a certain high frequency |
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event happens. That's where I'm trying to use condition variables. |
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Other clients will periodically (typically once every 5-50 ms) want to |
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see the most recent copy of a particular received message. I'm |
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thinking about using shared memory and rwlocks for that, but I haven't |
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figured out how to deal with the case where a process aborts while |
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holding a lock. |
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-- |
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Grant Edwards grant.b.edwards Yow! Kids, don't gross me |
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at off ... "Adventures with |
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gmail.com MENTAL HYGIENE" can be |
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carried too FAR! |
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