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Re: Does CFSocket use efficient polling?
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Re: Does CFSocket use efficient polling?


  • Subject: Re: Does CFSocket use efficient polling?
  • From: Douglas Davidson <email@hidden>
  • Date: Tue, 10 Feb 2009 17:32:49 -0800


On Feb 10, 2009, at 10:11 AM, Josh Graessley wrote:

CFSocket does a stand up job hiding the nasty details of coordinating between two different sources of events (file descriptors and mach ports). Unless you're absolutely certain that CFSocket is the last remaining hotspot in your code, stick with it.

It is not unreasonable to imagine a day when there will be a way for the system to wait on events for both mach ports and file descriptors. When/if that day comes, the CFSocket implementation may adopt the new mechanism and eliminate the extra thread. If you depend on CFSocket, you will probably get the performance win for free.

These are very important things to keep in mind. The job of CFSocket is to provide a way for a socket to act as a run loop source. Exactly how it does this is an implementation detail, and subject to change in future releases. If you are making a run loop-based application, and find that you want to integrate socket handling into it, CFSocket is a good place to look--or better yet some of the higher-level networking functionality built on top of it, if that fits your needs. If high- performance networking is the whole point of your project, and you need to extract every possible bit of speed, you may wish to program to the BSD sockets APIs directly. If you're not sure, try the higher- level APIs first, and move to something else only if it becomes clear that they are a bottleneck.


Douglas Davidson

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References: 
 >Does CFSocket use efficient polling? (From: Joel Reymont <email@hidden>)
 >Re: Does CFSocket use efficient polling? (From: Josh Graessley <email@hidden>)

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