b6449cae87
* `lib_stdlib`: basic extended OCaml stdlib and generic data structures
* `lib_data_encoding`: almost independant 'Data_encoding'
* `lib_error_monad`: almost independant 'Error_monad'
* `lib_stdlib_lwt`: extended Lwt library
* `lib_crypto`: all the crypto stuff (hashing, signing, cryptobox).
* `lib_base`:
- basic type definitions (Block_header, Operation, ...)
- a module `TzPervasives` to bind them all and to be the
single module opened everywhere.
In the process, I splitted `Tezos_data` and `Hash` in multiple
submodules, thus removing a lot of `-open`.
The following two modules may not have found their place yet:
- Base58 (currently in `lib_crypto`)
- Cli_entries (currently in `lib_stdlib_lwt`)
54 lines
1.7 KiB
OCaml
54 lines
1.7 KiB
OCaml
(**************************************************************************)
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(* *)
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(* Copyright (c) 2014 - 2017. *)
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(* Dynamic Ledger Solutions, Inc. <contact@tezos.com> *)
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(* *)
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(* All rights reserved. No warranty, explicit or implicit, provided. *)
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(* *)
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(**************************************************************************)
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open Lwt.Infix
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type t = {
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cancelation: unit Lwt_condition.t ;
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cancelation_complete: unit Lwt_condition.t ;
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mutable cancel_hook: unit -> unit Lwt.t ;
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mutable canceling: bool ;
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mutable canceled: bool ;
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}
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let create () =
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let cancelation = Lwt_condition.create () in
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let cancelation_complete = Lwt_condition.create () in
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{ cancelation ; cancelation_complete ;
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cancel_hook = (fun () -> Lwt.return ()) ;
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canceling = false ;
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canceled = false ;
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}
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let cancel st =
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if st.canceled then
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Lwt.return ()
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else if st.canceling then
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Lwt_condition.wait st.cancelation_complete
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else begin
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st.canceling <- true ;
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Lwt_condition.broadcast st.cancelation () ;
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Lwt.finalize
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st.cancel_hook
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(fun () ->
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st.canceled <- true ;
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Lwt_condition.broadcast st.cancelation_complete () ;
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Lwt.return ())
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end
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let on_cancel st cb =
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let hook = st.cancel_hook in
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st.cancel_hook <- (fun () -> hook () >>= cb)
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let cancelation st =
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if st.canceling then Lwt.return ()
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else Lwt_condition.wait st.cancelation
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let canceled st = st.canceling
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