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Re: Using Objective-C and GCD in HAL plugins / user-space audio drivers (it works!)
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Re: Using Objective-C and GCD in HAL plugins / user-space audio drivers (it works!)

  • Subject: Re: Using Objective-C and GCD in HAL plugins / user-space audio drivers (it works!)
  • From: Paul Davis <email@hidden>
  • Date: Wed, 05 Dec 2012 16:06:35 -0500



On Wed, Dec 5, 2012 at 3:39 PM, Joel Reymont <email@hidden> wrote:
Just want to report that using Obj-C and GCD works just find in HAL
plugins loaded by coreaudiod.

In fact, there are bits of Obj-C and GCD that show up in stack traces
inside coreaudiod itself. There's even a GCD dispatch queue
(com.apple.audio.HALB_DispatchQueue.SerialQueue).

The former was a concern for me because I didn't know if my blocks
would run when inside coreaudiod without manually invoking the
non-returning dispatch_main.

The latter is a revelation because I thought that GCD and dispatch
queues were too slow for audio work.

coreaudiod is almost certainly a multithreaded process, and it almost certainly contains realtime and non-realtime components.

unless you have clear evidence of the use of GCD within a realtime thread inside coreaudiod, i would continue with your existing belief.
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 >Using Objective-C and GCD in HAL plugins / user-space audio drivers (it works!) (From: Joel Reymont <email@hidden>)

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