• Open Menu Close Menu
  • Apple
  • Shopping Bag
  • Apple
  • Mac
  • iPad
  • iPhone
  • Watch
  • TV
  • Music
  • Support
  • Search apple.com
  • Shopping Bag

Lists

Open Menu Close Menu
  • Terms and Conditions
  • Lists hosted on this site
  • Email the Postmaster
  • Tips for posting to public mailing lists
Re: scheduling a block from a render callback
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: scheduling a block from a render callback

  • Subject: Re: scheduling a block from a render callback
  • From: Paul Davis <email@hidden>
  • Date: Tue, 14 Jan 2014 09:06:09 -0500



On Mon, Jan 13, 2014 at 9:39 PM, Doug Wyatt <email@hidden> wrote:
Some techniques that can be used safely from a realtime thread include:

- signal a pthread condvar (but don't lock the associated mutex. this is useful if you signal from the realtime thread continuously while you continue to see the condition under which you want to wake the lower-priority thread.)

I'd like to stress the continuously part of Doug's response here. If you do not do it continuously (and even if you do), then this method is subject to race conditions and in the worst case scenario (one involving developers who don't know enough about what they are doing), priority inversion. details here: https://groups.google.com/forum/?hl=ky#!msg/comp.programming.threads/wEUgPq541v8/ZByyyS8acqMJ

Used carefully, though (where carefully means "correctly definining and understanding the relationship between the low priority ToBeWoken thread and the realtime thread(s)"), then this is a useful technique.
 
 _______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden
  • Follow-Ups:
    • Re: scheduling a block from a render callback
      • From: Kyle Sluder <email@hidden>
References: 
 >scheduling a block from a render callback (From: Lucas Ives <email@hidden>)
 >RE: scheduling a block from a render callback (From: Tim Dorcey <email@hidden>)
 >Re: scheduling a block from a render callback (From: Paul Davis <email@hidden>)
 >RE: scheduling a block from a render callback (From: Tim Dorcey <email@hidden>)
 >Re: scheduling a block from a render callback (From: Doug Wyatt <email@hidden>)

  • Prev by Date: Re: scheduling a block from a render callback
  • Next by Date: Re: scheduling a block from a render callback
  • Previous by thread: Re: scheduling a block from a render callback
  • Next by thread: Re: scheduling a block from a render callback
  • Index(es):
    • Date
    • Thread