arca-42 [Re: arca-40]

Andrea Arcangeli (
Wed, 2 Dec 1998 19:42:30 +0100 (CET)

On Tue, 1 Dec 1998, Andrea Arcangeli wrote:

>I am uploading an arca-40 with these differences between arca-39:

Diff against arca-40:

o I rejected (at lest temporary) my update_shared_mappings()
feature, since Stephen pointed out that if two processes
are mappings the same file at the same time, a msync() could
cause a deadlock. The window was really very little and I guess
it' s not easily DoSsable, but it' s not acceptable of course ;).
A trivial fix would be implementing a down_trylock() that returns
0 if it' s not been able to held the lock istantaneously. Really
I read of a PG_dirty flag/feature, that could be the right thing
to do instead of using my trick.... I don' t know nothing about
the PG_dirty flag right now, so I can' t comment about it, I just
asked to Stephen to tell me something about it.

Andrea Arcangeli

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