[swift-users] Automatically dump stack trace on trap

[Karl Pickett]

Having stack traces on critical faults is an "enterprisey" feature that I
like.  It would be nice if swift allowed customization of what happened on
a trap (like array out of bounds), so it dumped the thread's stack trace to
stderr before exiting.

I can simulate the desired behavior by installing a signal handler for
SIGILL, and launch a script that fires up a debugger which attaches to the
process and dumps the stack trace(s) before terminating it.

I wrote it in C pretty easily and it is here:
https://gist.github.com/kjpgit/9a1059a5960694767193

It's just a small pain to build and link the C code to each swift project.
So my question is, can I use pure swift code for the signal handling
instead of that C shim.

1)  Does swift on linux support an atomic_fetch_add() equivalent out of the
box (or some other signal-safe serialization)
2) Any other concerns using swift code in a signal handler.  I'd just be
using Glibc system calls, and any char data would be pre-allocated.

Thanks
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