[haiku-bugs] Re: [Haiku] #8007: [app_server] fully unresponsive when resizing window of big textfile
- From: "bonefish" <trac@xxxxxxxxxxxx>
- Date: Tue, 08 Nov 2011 14:05:35 -0000
#8007: [app_server] fully unresponsive when resizing window of big textfile
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Reporter: ttcoder | Owner: axeld
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Changes (by bonefish):
* component: Servers/app_server => System/Kernel
Comment:
Replying to [comment:20 axeld]:
> Is priority inversion really so hard to circumvent, though? If we only
put this functionality into mutex, it would just need to adjust the
current lock holder's thread priority if a higher priority thread enters
its wait queue, right?
That's the basic idea. There are a few details that complicate things,
though. When a thread unlocks a mutex (or transfers ownership) its
priority possibly needs to be adjusted again. Since it can also hold other
mutexes at that time, the thread needs to maintain a list of mutexes it
holds, so the correct new priority can be determined. That also requires
us to check whether all code that uses mutexes explicitly destroys them.
Timeouts on mutexes add to the fun (as the holder's priority might need to
be adjusted).
That's all doable, but not completely trivial either.
--
Ticket URL: <http://dev.haiku-os.org/ticket/8007#comment:23>
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