Re: Restartable Sequences system call merged into Linux

From: Florian Weimer
Date: Fri Jun 15 2018 - 01:09:52 EST

On 06/14/2018 03:01 PM, Mathieu Desnoyers wrote:
Another alternative would be to somehow let glibc handle the registration,
perhaps only doing it for applications expressing their interest for rseq.

That's not really possible. We can't rely on the visibility of symbol bindings due to lazy binding and hidden visibility. Registration of intent by other means will not work because if it is done from user code, some other library may have already launched a thread at this point.

(It's also a moot point if we want to use restartable sequences in glibc itself.)