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Message-ID: <20170705083014.3f639570@inria.fr>
Date: Wed, 5 Jul 2017 08:30:14 +0200
From: Jens Gustedt <jens.gustedt@...ia.fr>
To: musl@...ts.openwall.com
Subject: move to a proper __lock_t type
Hello,
On Tue, 4 Jul 2017 18:28:42 -0400 Rich Felker <dalias@...c.org> wrote:
> On Wed, Jul 05, 2017 at 01:24:23AM +0300, Alexander Monakov wrote:
> > On Tue, 4 Jul 2017, Rich Felker wrote:
> >
> > > Thanks, applying.
> >
> > Can you please document the rationale for using bare ints instead
> > of an explicit struct for internal locks?
>
> I don't think there was/is any good one, it was just the choice that
> was made at the time. At one point there might have been places it
> avoided need for including a header to define the type, or where being
> explicit about the storage needed for the lock mattered (think stdio
> FILE layout, but it uses its own lock anyway), but I think it was
> mostly unjustified. I wouldn't be opposed to changing it.
So what would you think of the following migration path:
(1) Finish the volatile/atomic cleanup by adding a_load, a_load_l and
perhaps corresponding store primitives.
(2) Replace all occurences of "volatile int[2]" by "__lock_t" that
encapsulates just that in a struct.
(3) Replace the __lock/__unlock pair by the new algorithm
(4) Reduce "__lock_t" to a struct that simply has a "volatile int" as
sole member.
In all of that, would we need the "__" in the name of the structure? I
think this name will never be exported.
Jens
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