There are userspace libraries that do almost everything, but you hardly
see things like pthread_(EFD_STATE-like)_create() or similar system
interfaces based on such abstraction.
It actually seems as close to a condition variable as an eventfd can be.
A pthread condition typical code usage maps to eventfd like:
while (read(efd, ...)> 0)
if (CONDITION)
break;
So a pthread condition is really a wakeup gate like eventfd is.
EFD_STATE has nothing to do with a pthread condition.
No, your code does not work for pthread_cond_broadcast (which arguably
is the common case) because all the eventfd readers after the first
would block.
Paolo
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