package caqti-lwt

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type t
type hook
exception Off

Explicit Construction and Release

These functions are somewhat unsafe, since they don't enforce lifetime by passing a new switch as an argument to the user. They are nevertheless useful for applications which haven't been switch to the EIO-style resource handling discipline, esp. when dealing with connection pools. The caqti-eio package uses Eio.Switch which lacks these functions.

val eternal : t

A switch which is never released.

val create : unit -> t

Create a fresh releasable switch which is initially on.

val release : t -> unit Lwt.t

release sw calls all cleanup handlers on sw in reverse order of registration and marks the switch as being off.

EIO-Compatible Interface

val run : (t -> 'a Lwt.t) -> 'a Lwt.t

run f calls f with a fresh switch which will be released upon exit or in case of failure.

val check : t -> unit

check sw raises Off if sw has been turned off.

val on_release_cancellable : t -> (unit -> unit Lwt.t) -> hook

on_release_cancellable sw f registers f to be called upon the evetual release of sw unless remove_hook is called on the returned hook before that happen.

val remove_hook : hook -> unit

Given a hook returned by on_release_cancellable, remove_hook hook cancels the cleanup registered by that call.


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