Module `Lwt_main.Enter_iter_hooks`

Hooks, of type unit -> unit, that are called before each iteration of the Lwt main loop.

since: 4.2.0

type 'return_value kind = 'return_value: Hooks are functions of either type unit -> unit or unit -> unit Lwt.t; this type constructor is used only to express both possibilities in one signature.

type hook: Values of type hook represent hooks that have been added, so that they can be removed later (if needed).

val add_first : (unit -> unit kind) -> hook: Adds a hook to the hook sequence underlying this module, to be run first, before any other hooks already added.

val add_last : (unit -> unit kind) -> hook: Adds a hook to the hook sequence underlying this module, to be run last, after any other hooks already added.

val remove : hook -> unit: Removes a hook added by add_first or add_last.

val remove_all : unit -> unit: Removes all hooks from the hook sequence underlying this module.