[gnutls-devel] GnuTLS | WIP: fixed operation under multiple threads (!935)

[Development of GNU's TLS library]

Not sure if atomic is enough. It just makes a read-modify-write atomic. E.g. it doesn't help if one thread  reads the variable several times and another thread modifies it at the same time. Modern compiler optimization helps a lot (reading just once and keeping the value in a register), but you can't rely on it.

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