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Yeah, I think there would be some overhead, because it doesn't look like pthread_create allows specifying a stack segment. But I wouldn't be using pthread_create (or any C library for that matter), because Virgil goes all the way down to kernel, and there is no C environment.
I only experimented briefly[1] with getting Virgil threads to run on Linux. You need to call SYS_clone and specify a stack segment.
[1] https://github.com/titzer/virgil/blob/master/apps/Multi/Mult...
> Which reminds me: what is a good tool for analyzing / viewing a C++ programs call tree?
As already mentioned, perf can capture call stacks, but those are statistical samples, so not necessarily complete.
callgrind (https://www.valgrind.org/docs/manual/cl-manual.html) by contrast can capture all call-stacks.
kCacheGrind/qCacheGrind (https://kcachegrind.github.io/html/Home.html) can be used to view the output from either perf or callgrind. Sources for kcachegrind, including converters from perf, oprofile, etc., can be found at https://github.com/KDE/kcachegrind