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(************************************************************************)
(* * The Coq Proof Assistant / The Coq Development Team *)
(* v * INRIA, CNRS and contributors - Copyright 1999-2018 *)
(* <O___,, * (see CREDITS file for the list of authors) *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(* * (see LICENSE file for the text of the license) *)
(************************************************************************)
type 'a getter = unit -> 'a
type 'a installer = ('a getter) -> unit
type remote_counters_status = (string * Obj.t) list
let counters : remote_counters_status ref = ref []
let (!!) x = !(!x)
let new_counter ~name a ~incr ~build =
assert(not (List.mem_assoc name !counters));
let data = ref (ref a) in
counters := (name, Obj.repr data) :: !counters;
let m = Mutex.create () in
let mk_thsafe_local_getter f () =
(* - slaves must use a remote counter getter, not this one! *)
(* - in the main process there is a race condition between slave
managers (that are threads) and the main thread, hence the mutex *)
if Flags.async_proofs_is_worker () then
CErrors.anomaly(Pp.str"Slave processes must install remote counters.");
Mutex.lock m; let x = f () in Mutex.unlock m;
build x in
let mk_thsafe_remote_getter f () =
Mutex.lock m; let x = f () in Mutex.unlock m; x in
let getter = ref(mk_thsafe_local_getter (fun () -> !data := incr !!data; !!data)) in
let installer f =
if not (Flags.async_proofs_is_worker ()) then
CErrors.anomaly(Pp.str"Only slave processes can install a remote counter.");
getter := mk_thsafe_remote_getter f in
(fun () -> !getter ()), installer
let backup () = !counters
let snapshot () =
List.map (fun (n,v) -> n, Obj.repr (ref (ref !!(Obj.obj v)))) !counters
let restore l =
List.iter (fun (name, data) ->
assert(List.mem_assoc name !counters);
let dataref = Obj.obj (List.assoc name !counters) in
!dataref := !!(Obj.obj data))
l
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