ASS[0] is documented for Linux (and for POSIX) but i'm failing to find any information on how this applies to Cygwin. I assume, since there are no "real" signals on Cygwin, that it's not possible for a signal handler to break the state of some function that happened to be executed when the signal handler was triggered. But i could be wrong.
[0]: http://man7.org/linux/man-pages/man7/signal-safety.7.html
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