[issue30808] Use _Py_atomic API for concurrency-sensitive signal state

[STINNER Victor]

STINNER Victor added the comment:

There is a sig_atomic_t type. Should we use that one?
https://www.gnu.org/software/libc/manual/html_node/Atomic-Types.html

"To avoid uncertainty about interrupting access to a variable, you can use a particular data type for which access is always atomic: sig_atomic_t. Reading and writing this data type is guaranteed to happen in a single instruction, so there’s no way for a handler to run “in the middle” of an access."

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<http://bugs.python.org/issue30808>
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