How priority propagation works on read/write lock?

[Kamal R. Prasad]

Priority need not be propagated to readers as they will not block other
readers.
Most likely, you only need to propagate to the writer to avoid priority
inversron.

regards
-kamal


On 1/13/06, prime <guomingyan at gmail.com> wrote:
>
> Hi hackers,
>   I have a question about how priority propagation works on
> read/write lock.On locks that have only one owner at a determinate
> moment,we can simply propagate the priority to the owner of lock,but
> read/write lock may have many owners at some time,so how can we know
> who are the owners?
>   I browse the OpenSolaris' read/write lock implementation,and find
> that, it simply treats the owner of the lock as NULL when readers own
> the read/write lock.In this way,we can not propagate our priority to
> all threads that block us.
>
> Thanks very much.
> --
> Three passions, simple but overwhelmingly strong, have governed my life:
> the longing for love, the search for knowledge, and unbearable pity for
> the suffering of mankind.
>                         ---------Bertrand Russell
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