From: Sebastian Gniazdowski <psprint2@fastmail.com>
To: zsh-workers@zsh.org
Subject: Re: (Fwd) Re: [PATCH] db/gdbm rewrite
Date: Sun, 19 Feb 2017 01:01:20 -0800 [thread overview]
Message-ID: <1487494880.291196.885693096.6090E081@webmail.messagingengine.com> (raw)
In-Reply-To: <1487494013.288657.885684608.5BB76024@webmail.messagingengine.com>
On Sun, Feb 19, 2017, at 12:46 AM, Sebastian Gniazdowski wrote:
> change in Zsh forked process is a hole. It can be turned into an
> feature, though. A new builtin "zgdbmfetch paramname key" could be
> provided to re-fetch element when someone is going to try to do
> concurrent access with inherited FD and GDBM_SYNC lock, say with use of
> zsystem flock on other FD.
PS. Doing "fetch" might seem not nice in "hash-as-database" frontend,
but it would just clear PM_UPTODATE flag, rest is automatic. So maybe
"zgdbmclear param key". In my gdbm update I allocate regular Params
instead of heap-arena-ghosts, access database only when needed
leveraging PM_UPTODATE and GDBM_SYNC, it might be even possible to open
database without GDBM_SYNC and do locking with a "gdbmlock" builtin.
--
Sebastian Gniazdowski
psprint2@fastmail.com
next prev parent reply other threads:[~2017-02-19 9:01 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-02-19 0:43 Bart Schaefer
2017-02-19 8:46 ` Sebastian Gniazdowski
2017-02-19 9:01 ` Sebastian Gniazdowski [this message]
2017-02-19 18:19 ` Bart Schaefer
2017-02-20 8:32 ` Sebastian Gniazdowski
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