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Re: Hardware drivers (CD/DVD specifically) and anychrony

On 24 Aug 2007, at 19:45, Shawn Erickson wrote:

On 8/24/07, Jim Witte <email@hidden> wrote: 
        Very simple (or perhaps not) question, which might be more
appropriate for an IOKit list: Is there a technical reason why
*certain* phases of the actions of hardware, ... cannot be
performed synchronously, and thus not block the entire system?


I think you mean asynchronously in the above, anyway...

The system, as a whole, isn't stopping to spin up the disk, etc.. It
likely is upper level software (or a framework it depends on) sending
out a synchronous IO request for data that cannot be satisfied until
the disk is spun up and read. This blocks that thread until the IO
request is satisfied.

Aye, the SBOD more-or-less means that the thread in an app (and without being rude, I'm guessing it's The Fine Finder) responsible for dealing with the event loop is blocked. In this case it's not the system but the app which needs fixing.

Cheers,
Graham.

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References: 
 >Hardware drivers (CD/DVD specifically) and anychrony (From: Jim Witte <email@hidden>)
 >Re: Hardware drivers (CD/DVD specifically) and anychrony (From: "Shawn Erickson" <email@hidden>)



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