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I'm took a brief look and left confused. The list implementation seems completely bog standard with no special code for synchronization whatsoever. I don't see any counter and the rseq syscall seems unused except for feature detection. I don't think that's a viable replacement for any low level code.

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The low level interface is documented at https://github.com/compudj/librseq/blob/master/include/rseq/..., the list is just an internal implementation detail.

The syscall these days is invoked by libc not the program; libc provides access to some symbols that let the program execute rseqs as well.

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