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gmain: Access Unix signal handler state atomically

Philip Withnall requested to merge pwithnall/glib:1670-unix-signal-handling-safety into master

There are two variables which are used to pass state from the Unix signal handler interrupt function to the rest of gmain.c. They are currently defined as sig_atomic_t, which means that they are guaranteed to be interrupt safe. However, it does not guarantee they are thread-safe, and GLib attaches its signal handler interrupt function to a worker thread.

Make them thread-safe using atomics.

Signed-off-by: Philip Withnall withnall@endlessm.com

Fixes: #1670 (closed)

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