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Re: enabling caching for dl_iterate_phdr()

From: Roland McGrath <roland at redhat dot com>
To: davidm at hpl dot hp dot com
Cc: drepper at redhat dot com, libc-hacker at sources dot redhat dot com
Date: Tue, 23 Dec 2003 14:24:23 -0800
Subject: Re: enabling caching for dl_iterate_phdr()

> Would it be possible to add two atomic counters, dl_load_additions and
> dl_load_removals, which would get incremented whenever something is a
> phdr is added to/removed from the list that is traversed by
> dl_iterate_phdr()?

What interface do you propose for exposing such counters?
We won't be adding any published interfaces using variables.

> Any opinions?  I guess the alternative that was mentioned in the past
> was to use callbacks, but that seems very dangerous in regards to
> deadlock etc.

If your callback functions do nothing but increment atomic counters of your
own, then there is no problem.

References:
- enabling caching for dl_iterate_phdr()
  - From: David Mosberger

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