2016-01-07 06:24:35 -05:00
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(* Copyright (C) 2016, Thomas Leonard <thomas.leonard@unikernel.com>
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See the README file for details. *)
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(** Keep track of the queue length for output buffers. *)
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type t
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val create : string -> t
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(** [create name] is a new empty queue. [name] is used in log messages. *)
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2017-04-29 06:42:31 -04:00
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val send : t -> (unit -> unit Lwt.t) -> unit Lwt.t
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2016-01-07 06:24:35 -05:00
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(** [send t fn] checks that the queue isn't overloaded and calls [fn ()] if it's OK.
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The item is considered to be queued until the result of [fn] has resolved.
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In the case of mirage-net-xen's [writev], this happens when the frame has been
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added to the ring (not when it is consumed), which is fine for us. *)
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