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Re: pthread code I may use
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Re: pthread code I may use


On Apr 1, 2008, at 3:54 PM, Theodore H. Smith wrote: 

On 1 Apr 2008, at 23:36, Rick Altherr wrote:

Why not use AIO? Then you don't need to handle the thread creation, etc. You would just specify what file descriptor, offset, and length you want read. Then, when you are ready, you can see if the AIO was completed. 

Because I heard AIO is sometimes implemented as threads underneath :)

So I might as well write my own thread code, and cut out the overhead.

Also, I want my code to run on Mac MachO, Win32, and Linux, and Mac Carbon too. Not sure how that will work out with AIO.

And finally... I just like learning and doing new things. So getting threads to work is kinda cool to me.

--
http://elfdata.com/plugin/
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AIO definitely exists in MacOS X, Linux, and Windows (though the functions change names here). I'm not entirely sure what you mean by Carbon (OS 9 or OS X using Carbon. It is there if the latter.)

It _could_ be written as threads, but that isn't really the point. The system has more knowledge about how many AIO requests are being sent out system-wide. It will ensure that at most a system-wide # of requests will be inflight. That can save overall system performance even if it hurts you program under certain circumstances. Why reinvent the wheel?

--
Rick Altherr
Architecture and Performance Group
email@hidden


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References: 
 >pthread code I may use (From: "Theodore H. Smith" <email@hidden>)
 >Re: pthread code I may use (From: Rick Altherr <email@hidden>)
 >Re: pthread code I may use (From: "Theodore H. Smith" <email@hidden>)



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