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Re: pthread weak symbols

From: Mike Frysinger <vapier at gentoo dot org>
To: Matt Turner <mattst88 at gmail dot com>
Cc: GNU C Library <libc-alpha at sourceware dot org>
Date: Tue, 29 Dec 2015 21:05:49 -0500
Subject: Re: pthread weak symbols
Authentication-results: sourceware.org; auth=none
References: <CAEdQ38EeTtv6zty4wDAr-s=SERMOqgQMSqex7qAirj_UtZOviA at mail dot gmail dot com>

On 09 Dec 2015 15:20, Matt Turner wrote:
> I'm interested in avoiding pthread/locking overhead in Mesa
> (http://mesa3d.org/) when the application is not using threads.
> 
> I've read about glibc's weak pthread symbols that are intended to
> solve this problem, but I've also read on this list that they weren't
> a good idea and have some (unknown to me) problems.
> 
> Can I get some clarification about what problems there are with the
> weak pthread symbols, and perhaps some suggested alternative
> solutions?

we don't provide weak symbols for all funcs, so you're a bit limited
in which ones you can use.  run `readelf -s` on libc.so to see which
ones are available.
-mike

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References:
- pthread weak symbols
  - From: Matt Turner

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