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From: Alexander Turenko <alexander.turenko@tarantool.org>
To: Vladislav Shpilevoy <v.shpilevoy@tarantool.org>
Cc: tarantool-patches@dev.tarantool.org
Subject: Re: [Tarantool-patches] [PATCH 2.X 5/7] module api: luaT_temp_luastate & luaT_release_temp_luastate
Date: Thu, 1 Oct 2020 06:35:20 +0300	[thread overview]
Message-ID: <20201001033520.w3jebtdr57hfrtcb@tkn_work_nb> (raw)
In-Reply-To: <0dbdbece-3f14-ba6d-b7ca-50f39f3b46d6@tarantool.org>

On Wed, Sep 30, 2020 at 01:21:13AM +0200, Vladislav Shpilevoy wrote:
> On 29.09.2020 07:17, Alexander Turenko wrote:
> > On Tue, Sep 29, 2020 at 12:21:18AM +0200, Vladislav Shpilevoy wrote:
> >> Thanks for the patch!
> >>
> >> I strongly don't like this export. It seems to be too internal.
> > 
> > I have no point to start discussion. Can you clarify your feeling?
> 
> I don't like that we give access to fiber's Lua state. If a user will
> leave anything on it, it can lead to anything as well, UB I guess. But
> I didn't check.
> 
> >> But I have no better ideas than propose to implement your own
> >> lua_State cache in the merger module. It does not seem to be too
> >> hard, and I don't think it would occupy much memory.
> >>
> >> Just a simple list of lua_State objects, created by luaT_newthread
> >> on demand, and put back into the list when unused. What is wrong
> >> with that?
> > 
> > When we able to simplify modules, it worth to do so (when there are no
> > certain objections). Write once, use many.
> 
> What are applications for that except the merger? Potentially.

When we want to call a Lua function (some callback), which can
potentially yield (so we can't use luaT_state()), but we have no direct
access to some current Lua state. It may be because we're in box C
function or because of API design: for merger it is because API of
source's virtual functions are Lua agnostic.

So... maybe other projects with pure C part and Lua/C part, where C code
may call Lua/C code in some way. Say, when there is general pure C code and
particular implementation of some API, which works with Lua objects.
Something designed as quite extensible thing.

Anyway, I already agreed that it is not as simple as cache and we should
return back to it later if there will be a need.

  reply	other threads:[~2020-10-01  3:35 UTC|newest]

Thread overview: 64+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-24 17:00 [Tarantool-patches] [PATCH 2.X 0/7] RFC: module api: extend for external merger Lua module Timur Safin
2020-09-24 17:00 ` [Tarantool-patches] [PATCH 2.X 1/7] module api: export box_tuple_validate Timur Safin
2020-09-28 22:20   ` Vladislav Shpilevoy
2020-10-02 12:24     ` Timur Safin
2020-10-09  1:11     ` Alexander Turenko
2020-10-09 20:11       ` Vladislav Shpilevoy
2020-10-10  1:19         ` Alexander Turenko
2020-09-29  5:25   ` Alexander Turenko
2020-10-05  7:35     ` Alexander Turenko
2020-09-24 17:00 ` [Tarantool-patches] [PATCH 2.X 2/7] module api: export box_key_def_dup Timur Safin
2020-09-28 22:21   ` Vladislav Shpilevoy
2020-09-29  5:03     ` Alexander Turenko
2020-09-29 23:19       ` Vladislav Shpilevoy
2020-10-01  3:05         ` Alexander Turenko
2020-10-02 12:25           ` Timur Safin
2020-10-02 12:26     ` Timur Safin
2020-09-24 17:00 ` [Tarantool-patches] [PATCH 2.X 3/7] module api: luaT_newthread Timur Safin
2020-09-28 22:21   ` Vladislav Shpilevoy
2020-10-02 12:27     ` Timur Safin
2020-10-02 21:48       ` Vladislav Shpilevoy
2020-09-29  6:25   ` Alexander Turenko
2020-10-02 12:26     ` Timur Safin
2020-10-02 12:53       ` Alexander Turenko
2020-09-29 15:19   ` Igor Munkin
2020-10-02 16:12     ` Timur Safin
2020-10-03 16:57       ` Igor Munkin
2020-09-24 17:00 ` [Tarantool-patches] [PATCH 2.X 4/7] module api: luaL_register_module & luaL_register_type Timur Safin
2020-09-28 22:21   ` Vladislav Shpilevoy
2020-09-29  5:09     ` Alexander Turenko
2020-09-29 23:20       ` Vladislav Shpilevoy
2020-09-30  6:31         ` Alexander Turenko
2020-09-30  6:33           ` Alexander Turenko
2020-10-02 16:14       ` Timur Safin
2020-09-29  8:03     ` Igor Munkin
2020-09-29 23:21       ` Vladislav Shpilevoy
2020-10-02 16:14       ` Timur Safin
2020-10-03  3:24         ` Alexander Turenko
2020-09-24 17:00 ` [Tarantool-patches] [PATCH 2.X 5/7] module api: luaT_temp_luastate & luaT_release_temp_luastate Timur Safin
2020-09-28 22:21   ` Vladislav Shpilevoy
2020-09-29  5:17     ` Alexander Turenko
2020-09-29 23:21       ` Vladislav Shpilevoy
2020-10-01  3:35         ` Alexander Turenko [this message]
2020-09-29 15:10     ` Igor Munkin
2020-09-29 21:03       ` Alexander Turenko
2020-09-29 23:23         ` Vladislav Shpilevoy
2020-09-30 10:09           ` Alexander Turenko
2020-10-01 15:06             ` Igor Munkin
2020-10-03  2:16         ` Alexander Turenko
2020-10-02 12:24       ` Timur Safin
2020-09-24 17:00 ` [Tarantool-patches] [PATCH 2.X 6/7] module api: luaL_checkibuf & luaL_checkconstchar Timur Safin
2020-09-28 22:21   ` Vladislav Shpilevoy
2020-09-29  5:53     ` Alexander Turenko
2020-09-29 23:25       ` Vladislav Shpilevoy
2020-10-01  3:00         ` Alexander Turenko
2020-10-02 16:14           ` Timur Safin
2020-10-02 21:48             ` Vladislav Shpilevoy
2020-10-08 13:50           ` Timur Safin
2020-09-24 17:00 ` [Tarantool-patches] [PATCH 2.X 7/7] module api: luaL_cdata_iscallable Timur Safin
2020-09-28 22:21   ` Vladislav Shpilevoy
2020-09-29  5:19     ` Alexander Turenko
2020-10-02 16:14     ` Timur Safin
2020-10-02 12:23 ` [Tarantool-patches] [PATCH 2.X 0/7] RFC: module api: extend for external merger Lua module Timur Safin
2020-10-02 21:49   ` Vladislav Shpilevoy
2020-10-03  2:54   ` Alexander Turenko

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