Subject: Re: [boost] Portable robust mutex an another try...
From: Ladislav Sopko (lsopko_at_[hidden])
Date: 2014-07-18 03:08:40
I did try to continue with */Ion Gaztanaga's /*idea of portable robust
I post my code and considerations in codereview.
I hope to find some one to discuss about.
> The portable mutex has been in dormant state for a long time, so thanks
> for recovering it ;-)
> It wasn't further developed and I think your proposal could be an
> improvement, although I still don't like the preallocation of a 4MB
> file. I have no much time lately to review and add improvements to
> Interprocess, but please add this link or the patch to a boost trac
> ticket or as a GitHub pull request so that this is not forgotten when I
> find some time.
Allocation of that 4MB is small fee for much better performance,
search of files on disk slow it down really hard. Then I think to
extend it with time stamp as
Niall Douglas wrote. I just need atomic CAS for 64bit. Cause the
time stamp and process ID
must be changed in one shot. Then I can skip many robust checks, if
the time from last lock
is shorter than some predefined interval. So many regular locks will
file lock and it will run faster. In case one process die, there
will be expired
timeout and lock candidate will go check file lock.
I'll check if I can add a 64bit CAS in
boost\interprocess\detail\atomic.hpp. (if you know
how it should be done, it will be a big help for me, cause I have
not a lot of practice in atomic portable world.)
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