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83 lines
2.7 KiB
OCaml
83 lines
2.7 KiB
OCaml
(** Fibers.
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A fiber is a lightweight computation that runs cooperatively
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alongside other fibers. In the context of moonpool, fibers
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have additional properties:
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- they run in a moonpool runner
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- they form a simple supervision tree, enabling a limited form
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of structured concurrency
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*)
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(**/**)
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(**/**)
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type 'a t
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(** A fiber returning a value of type ['a]. *)
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val res : 'a t -> 'a Fut.t
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(** Future result of the fiber. *)
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type 'a callback = 'a Exn_bt.result -> unit
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(** Callbacks that are called when a fiber is done. *)
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type cancel_callback = Exn_bt.t -> unit
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val peek : 'a t -> 'a Fut.or_error option
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(** Peek inside the future result *)
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val is_done : _ t -> bool
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(** Has the fiber completed? *)
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val is_cancelled : _ t -> bool
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(** Has the fiber completed with a failure? *)
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val is_success : _ t -> bool
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(** Has the fiber completed with a value? *)
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val await : 'a t -> 'a
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(** [await fib] is like [Fut.await (res fib)] *)
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val check_if_cancelled : unit -> unit
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(** Check if the current fiber is cancelled, in which case this raises.
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Must be run from inside a fiber.
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@raise Failure if not. *)
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val yield : unit -> unit
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(** Yield control to the scheduler from the current fiber.
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@raise Failure if not run from inside a fiber. *)
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exception Cancelled of Exn_bt.t
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(** Exception for fibers that are cancelled. Polling points such
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as {!yield} and {!await} will raise this if the fiber has been cancelled. *)
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val with_cancel_callback : _ t -> cancel_callback -> (unit -> 'a) -> 'a
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(** [with_cancel_callback fib cb (fun () -> <e>)] evaluates [e]
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in a scope in which, if the fiber [fib] is cancelled,
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[cb()] is called. If [e] returns without the fiber being cancelled,
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this callback is removed. *)
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val on_result : 'a t -> 'a callback -> unit
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(** Wait for fiber to be done and call the callback
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with the result. If the fiber is done already then the
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callback is invoked immediately with its result. *)
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val spawn_top : ?name:string -> on:Runner.t -> (unit -> 'a) -> 'a t
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(** [spawn_top ~on f] spawns a new (toplevel) fiber onto the given runner.
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This fiber is not the child of any other fiber: its lifetime
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is only determined by the lifetime of [f()]. *)
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val spawn_link : ?name:string -> protect:bool -> (unit -> 'a) -> 'a t
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(** [spawn_link ~protect f] spawns a sub-fiber [f_child]
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from a running fiber [parent].
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The sub-fiber [f_child] is attached to the current fiber and fails
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if the current fiber [parent] fails.
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@param protect if true, when [f_child] fails, it does not
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affect [parent]. If false, [f_child] failing also
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causes [parent] to fail (and therefore all other children
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of [parent]).
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Must be run from inside a fiber.
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@raise Failure if not run from inside a fiber. *)
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