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From: Jeff King <peff@peff.net>
To: Michael Haggerty <mhagger@alum.mit.edu>
Cc: Brandon Williams <bmwill@google.com>,
	Lars Schneider <larsxschneider@gmail.com>,
	Martin Ågren <martin.agren@gmail.com>,
	Git Users <git@vger.kernel.org>
Subject: Re: [PATCH] config: use a static lock_file struct
Date: Sat, 2 Sep 2017 09:50:15 -0400
Message-ID: <20170902135015.2hf4b3o4xivdd5x2@sigill.intra.peff.net> (raw)
In-Reply-To: <20170902084451.h5pmbtolqcl2j3w4@sigill.intra.peff.net>

On Sat, Sep 02, 2017 at 04:44:51AM -0400, Jeff King wrote:

> There are actually very few callers of create_tempfile (I count two).
> Everybody just uses lock_file(). So I think we could get away with just
> modifying the internals of the lock struct to hold a pointer, and then
> teaching commit_lock_file() et al to reset it to NULL after performing
> an operation that frees the tempfile. We could even modify
> rename_tempfile() and friends to take a pointer-to-pointer and NULL it
> itself. That would make it harder to get wrong.

I take it back.  It's true that there are very few create_tempfile()
callers, but we'd want to have a similar change for mks_tempfile_*, and
there are a lot more of those.

One solution would be to add an extra level of indirection, like:

  struct tempfile {
	struct the_part_that_we_put_on_our_global_list *data;
  };

That lets us keep normal value semantics for "struct tempfile", which is
nice. And existing callers wouldn't have to be modified at all for the
creation/deletion bits. But I suspect it would also result in a lot of
replacements like s/temp->/temp.data->/ for any callers that look at the
underlying fields that have moved into the sub-struct.

-Peff

  reply index

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-08-27  7:37 [PATCH] pkt-line: re-'static'-ify buffer in packet_write_fmt_1() Martin Ågren
2017-08-27 15:41 ` Jeff King
2017-08-27 18:25   ` Jeff King
2017-08-27 18:21 ` Lars Schneider
2017-08-27 19:09   ` Martin Ågren
2017-08-27 19:15     ` Jeff King
2017-08-27 20:04     ` Lars Schneider
2017-08-27 23:23       ` Jeff King
2017-08-28  4:11         ` Martin Ågren
2017-08-28 17:52           ` Stefan Beller
2017-08-28 17:58             ` Jeff King
2017-09-05 10:03               ` Junio C Hamano
2017-08-29 17:51           ` Lars Schneider
2017-08-29 18:53             ` Jeff King
2017-08-29 18:58               ` [PATCH] config: use a static lock_file struct Jeff King
2017-08-29 19:09                 ` Brandon Williams
2017-08-29 19:10                   ` Brandon Williams
2017-08-29 19:12                   ` Jeff King
2017-08-30  3:25                     ` Michael Haggerty
2017-08-30  4:31                       ` Jeff King
2017-08-30  4:55                         ` Michael Haggerty
2017-08-30  4:55                         ` Jeff King
2017-08-30  5:55                           ` Jeff King
2017-08-30  7:07                             ` Michael Haggerty
2017-09-02  8:44                               ` Jeff King
2017-09-02 13:50                                 ` Jeff King [this message]
2017-08-30  6:55                           ` Michael Haggerty
2017-08-30 19:53                             ` Jeff King
2017-08-30 19:57                               ` Brandon Williams
2017-08-30 20:11                                 ` Jeff King
2017-08-30 21:06                                   ` Brandon Williams
2017-08-31  4:09                                     ` Jeff King
2017-09-06  3:59                 ` Junio C Hamano
2017-09-06 12:41                   ` Jeff King
2017-08-29 19:22               ` [PATCH] pkt-line: re-'static'-ify buffer in packet_write_fmt_1() Martin Ågren
2017-08-29 21:48                 ` Jeff King
2017-08-30  5:31                   ` Jeff King
2017-09-05 10:03                     ` Junio C Hamano
2017-10-10  4:06                       ` [PATCH 0/2] Do not call cmd_*() as a subroutine Junio C Hamano
2017-10-10  4:06                         ` [PATCH 1/2] describe: do not use " Junio C Hamano
2017-10-10 13:43                           ` SZEDER Gábor
2017-10-11  6:00                             ` Junio C Hamano
2017-10-10  4:06                         ` [PATCH 2/2] merge-ours: " Junio C Hamano

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