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Message-ID: <20140222143536.GA5438@diogenes.samsung.router>
Date: Sat, 22 Feb 2014 15:35:43 +0100
From: Jens Eichendorff <jexo@...ine.de>
To: musl@...ts.openwall.com
Subject: What does this code do?
While skimming some parts of the musl libc I have come across the
following weird line in `src/thread/__wait.c':
if (priv) priv = 128; priv=0;
whereby `priv' is then bitwise OR-ed to the FUTEX_WAIT operation
constant to a futex syscall. Does this code exist to avoid
optimizations, do optimizations, or just add waiting time? What does it
do and what is the `priv' parameter of __wait() for? Excuse me if this
is a really stupid question, I'm not very familiar with somewhat
low-level code.
Looking through the git logs this is part of the initial import commit,
so I could not find any comments to why this was done.
MfG
Jens
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