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Remove the general purpose spin-lock from getrandom, and don't spin when polling /dev/random. We can just use the poll() call itself to have threads wait for /dev/urandom to be safe. Now the only use of spin locks is to make sure open() is called exactly once when a file is used to get random data. This is fine, as the open() syscall will never block when opening a device, unlike read/writes which can obviously block. Signed-off-by: Joe Richey <joerichey@google.com>
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