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SubjectRe: [RFC] unify semaphore implementations
Benjamin LaHaise writes:

> There are at least two users who need asynchronous semaphore/mutex
> operations: aio_write (which needs to acquire i_sem), and nfs.

What do you mean by asynchronous semaphore/mutex operations? Are you
talking about a down operation that will acquire the semaphore if it
is free, but if not, arrange for a callback and return immediately, or

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