----- On Jun 11, 2018, at 3:55 PM, Florian Weimer fwei...@redhat.com wrote:
> On 06/11/2018 09:49 PM, Mathieu Desnoyers wrote: >> It should be noted that there can be only one rseq TLS area registered per >> thread, >> which can then be used by many libraries and by the executable, so this is a >> process-wide (per-thread) resource that we need to manage carefully. > > Is it possible to resize the area after thread creation, perhaps even > from other threads? I'm not sure why we would want to resize it. The per-thread area is fixed-size. Its layout is here: include/uapi/linux/rseq.h: struct rseq The ABI is designed so that all users (program and libraries) can interact through this per-thread TLS area. > > If there is only one contiguous area, this generally means there needs > to be linker support, similar to what we have for initial-exec TLS today. Not entirely sure what you imply by "one contiguous area". All we need is a single fixed-size TLS area for each thread. Thanks, Mathieu > > Thanks, > Florian -- Mathieu Desnoyers EfficiOS Inc. http://www.efficios.com
