Memory barrier for fat initialization
tg at gmplib.org
Tue Jan 13 13:58:28 UTC 2015
nisse at lysator.liu.se (Niels Möller) writes:
GMP's fat initialization (I'm looking at the x86_64 code now) ends with
*((volatile int *) &__gmpn_cpuvec_initialized) = 1;
I suspect that it's possible (but unlikely) that a different thread on
another cpu may read __gmpn_cpuvec_initialized, get 1, read thresholds
or pointers, and still get old values.
How could that happen? Please elaborate.
Please encrypt, key id 0xC8601622
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