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(************************************************************************)
(* v * The Coq Proof Assistant / The Coq Development Team *)
(* <O___,, * INRIA - CNRS - LIX - LRI - PPS - Copyright 1999-2012 *)
(* \VV/ **************************************************************)
(* // * This file is distributed under the terms of the *)
(* * GNU Lesser General Public License Version 2.1 *)
(************************************************************************)
type 'a getter = unit -> 'a
type 'a installer = ('a getter) -> unit
let new_counter a ~incr ~build =
let data = ref a in
let m = Mutex.create () in
let mk_thsafe_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.coq_slave_mode > 0 then
Errors.anomaly(Pp.str"Slave processes must install remote counters");
Mutex.lock m; let x = f () in Mutex.unlock m;
build x in
let getter = ref (mk_thsafe_getter (fun () -> data := incr !data; !data)) in
let installer f =
if !Flags.coq_slave_mode < 1 then
Errors.anomaly(Pp.str"Only slave processes can install a remote counter")
else getter := f in
(fun () -> !getter ()), installer
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