Re: [boost] shared_mutex deadlocks?

From: Lance.Diduck_at_[hidden]
Date: 2008-04-21 09:28:48

>>  Another interesting tidbit is that if I move the focus from the cmd 
>> window  in which the test is running, it completes. Go figure.
>>

>Priority inversion? I think that Windows boosts the priority of threads
(I thought whole processes actually) 
>which have a focused window.

Since this only happens on a SMP, then it is not likely priority
inversion. More likely it is a barrier problem. It would be intersting
to run the same test on the same hardware using MinGW or Cygwin, and see
if you get the same behavior. 

-----Original Message-----
From: boost-bounces_at_[hidden]
[mailto:boost-bounces_at_[hidden]] On Behalf Of Giovanni Piero
Deretta
Sent: Monday, April 21, 2008 9:10 AM
To: boost_at_[hidden]
Subject: Re: [boost] shared_mutex deadlocks?

On Mon, Apr 21, 2008 at 2:51 PM, Peter Dimov <pdimov_at_[hidden]> wrote:
> >> How often, on what platform?
>  >
>  > Every time, on a dual core Pentium D running XP64. The program is 
> compiled  > as 32 bit with MSVC 7.1. It looks like a livelock rather 
> than a deadlock,  > since the program keeps spinning its wheels at
100% but never completes.
>  > The writer thread is probably either blocked or starved. This 
> happens on  > another (quad core) machine too for which I don't know 
> the specs at the  > moment.
>
>  The other box is XP32 w/ Q6600.
>
>  Another interesting tidbit is that if I move the focus from the cmd 
> window  in which the test is running, it completes. Go figure.
>

Priority inversion? I think that Windows boosts the priority of threads
(I thought whole processes actually) which have a focused window.

--
gpd
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