The nng_aio_wait() function waits for an asynchronous I/O operation
to complete.
If the operation has not been started, or has already
completed, then it returns immediately.
If a callback was set with aio when it was allocated, then this function will not be called until the callback has completed.
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Important
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This function should never be called from a function that itself
is a callback of an aio, either this one or any other.
Doing so may result in a deadlock.
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