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Date: Wed, 14 Jan 2015 23:33:15 -0500
From: Rich Felker <dalias@...c.org>
To: musl@...ts.openwall.com
Subject: First draft of new synccall, seems to be working
I just wrote the first draft of the new __synccall, used for
multithreaded set*id(). All the concepts seem sound and seem to be
working. It's missing the code to block creation of unboundedly more
threads while __synccall is running, but otherwise everything's in
place. Both the /proc/self/task processing logic and the PI futex
logic seem to be working as expected. I haven't yet tested in the
presence of multiple realtime priorities where there's a risk of some
threads never getting a chance to run; I need a framework with a
high-RT-prio supervisor process to kill the test if it runs too long,
because I don't want to be rebooting boxes over and over to test. :)
Attached is the current draft of the code, as a source file rather
than a patch since the whole file is basically rewritten. Comments
welcome.
Rich
View attachment "synccall.c" of type "text/plain" (3768 bytes)
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